Relevant bibliographies by topics / Desiccant cooling system

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  2. Dissertations / Theses
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Academic literature on the topic 'Desiccant cooling system'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Desiccant cooling system"

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Pesaran, A. A. "Desiccant Degradation in Desiccant Cooling Systems: An Experimental Study." Journal of Solar Energy Engineering 115, no. 4 (1993): 212–19. http://dx.doi.org/10.1115/1.2930052.

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We conducted experiments to quantify the effects of thermal cycling and exposure to contamination on solid desiccant materials that may be used in desiccant cooling systems. The source of contamination was cigarette smoke, which is considered one of the worst pollutants in building cooling applications. We exposed five different solid desiccants to “ambient” and “contaminated” humid air: silica gel, activated alumina, activated carbon, molecular sieves, and lithium chloride. We obtained the moisture capacity of samples as a function of exposure time. Compared to virgin desiccant samples, the capacity loss caused by thermal cycling with humid ambient air was 10 percent to 30 percent for all desiccants. The capacity loss because of combined effect of thermal cycling with “smoke-filled” humid air was between 30 percent to 70 percent. The higher losses occurred after four months of experiment time, which is equivalent to four to eight years of field operation. Using a system model and smoke degradation data on silica gel, we predicted that, for low-temperature regeneration, the loss in performance of a ventilation-cycle desiccant cooling system would be between 10 percent to 35 percent, in about eight years, with higher value under worst conditions.
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Priya, S. Shanmuga, Sneha Reddy, Priyadarshini Balachandar, and Sanober Wadhwania. "Solar assisted liquid desiccant cooling using clay based membranes." MATEC Web of Conferences 144 (2018): 04011. http://dx.doi.org/10.1051/matecconf/201814404011.

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The environmental concerns have led to the urge of the usage of non-conventional energy resources like solar, wind, thermal, geothermal etc. which provide enormous source of energy without causing any further diminution of the environment. Instead of the conventional HVAC systems that cause colossal environmental perils, usage of liquid desiccants in coming in vogue whereby reducing ecological threats. Moreover, solar assisted systems provide further impulse to such systems. This paper discusses about the various comparisons between liquid desiccants: Lithium chloride, Potassium formate and Calcium chloride and concludes that potassium formate is the best desiccant to be used among the three. Potassium formate (HCOOK) is used which is cheaper and less corrosive as compared to the other aqueous salts, and has a negative crystallization temperature. Potassium formate is a new liquid desiccant and thus, not much research is available currently. The weather conditions of Manipal provide an appropriate condition for the experimentations of solar aided liquid desiccant evaporative cooling systems due to its humid climate and intense solar radiation obtained. The small scale experimentation also encounters the problem of liquid desiccant carryover by the air flow, with the help of clay based membranes which are again cheap, environmentally benign and obtained in a facile way. The projected system takes complete advantage of pure solar energy aimed at the regeneration of liquid desiccant.
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Pesaran, A. A. "Desiccant Degradation in Desiccant Cooling Systems: A System Study." Journal of Solar Energy Engineering 115, no. 4 (1993): 237–40. http://dx.doi.org/10.1115/1.2930056.

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We predicted the impact of desiccant degradation on the performance of an open-cycle desiccant cooling system in ventilation mode using the degradation data on silica gel obtained from a previous study. The degradation data were based on thermal cycling desiccant samples and exposing them to ambient or contaminated air. Depending on the degree of desiccant degradation, the decrease in the thermal coefficient of performance (COP) and the cooling capacity of the system for low-temperature regeneration was 10 percent to 35 percent. The 35 percent loss occurred based on the worst-case desiccant degradation scenario. Under more realistic conditions the loss in system performance is expected to be lower.
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Sampath, Suranjan Salins, Shiva Kumar, and S. V. Kota Reddy. "Influence of Different Desiccants, Flow Type and Packings on the Liquid Desiccant Dehumidification System: A Review." International Journal of Air-Conditioning and Refrigeration 28, no. 01 (2020): 2030002. http://dx.doi.org/10.1142/s2010132520300025.

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Desiccant cooling mechanism is one of the alternate methods to control the humidity of air and temperature, compared to the conventional vapor compression method of air conditioning. Desiccant cooling doesn’t use harmful chemicals which effect the ozone layer and it saves lots of energy. Summer air condition system can use this technology since it removes the latent heat load from the room effectively and this process is economical. Selection of the appropriate liquid desiccant and packing material is very vital to obtain maximum dehumidification. This paper focuses on the different desiccants and packings used by different researchers to enhance the dehumidification. Simple and hybrid systems are also reviewed, and their comparison are presented based on the construction and dehumidification performance.
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Murthy, Krishna, Rahul Shetty, and Shiva Kumar. "Review on the Influence of Various Types Liquid Desiccants on the Performance of Dehumidification System." International Journal of Air-Conditioning and Refrigeration 28, no. 03 (2020): 2030005. http://dx.doi.org/10.1142/s2010132520300050.

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Air conditioning is one of the large energy consuming sectors, as it comforts the human in closed environment. Especially, in coastal regions where both temperature and humidity are high, it demands for air conditioning. Usually, in such cases, cooling and dehumidification of outside air is done by cooling coils. Such cooling and dehumidification coils requires relatively large amount of energy. In the era of energy saving technologies, Liquid desiccant system (LDS) has proved to be one of the best alternatives for controlling the humidity, economically and efficiently. Different liquid desiccants are available for dehumidification purpose with their own advantages and disadvantages. This paper summarizes the different liquid desiccants used by researchers in their study and the performances analysis of dehumidification process. An attempt is also made to summarize the characteristics of the different hybrid or composite desiccants developed by researchers in order to improve the desiccant properties for the better dehumidification process.
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Hussain, Shafqat, Abdulrahim Kalendar, Muhammad Zeeshan Rafique, and Patrick Oosthuizen. "Numerical investigations of solar-assisted hybrid desiccant evaporative cooling system for hot and humid climate." Advances in Mechanical Engineering 12, no. 6 (2020): 168781402093499. http://dx.doi.org/10.1177/1687814020934999.

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This article presents numerical investigations of the solar-assisted hybrid desiccant evaporative cooling system integrated with standard air collectors for applications under the hot and humid climatic conditions of Kuwait city. The objective is to introduce the energy-efficient and carbon-free solar-assisted hybrid desiccant evaporative cooling system to alleviate the principal problems of electricity consumption and carbon emissions resulting from the use of the conventional vapor-compression cooling systems. In the normal building, during cooling load operation, the solar-assisted hybrid desiccant evaporative cooling system can cope with the cooling load particularly sensible by evaporative cooling and latent through desiccant dehumidification. The outcomes of this work indicate that solar-assisted hybrid desiccant evaporative cooling device integrated with air collectors is capable of providing average coefficient of performance of 0.85 and has the potential to provide cooling with energy saving when compared with conventional vapor-compression refrigeration systems. It was concluded that under the intense outdoor environmental conditions (ambient air at greater than 45°C and 60% relative humidity), the delivered supply air from the evaporative cooling was nearly at 27°C and 65% relative humidity. To solve this problem, the system was assisted with conventional cooling coil (evaporator of heat pump) to supply air at comfortable conditions in the conditioned space.
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Khosravi, S., Yat Huang Yau, T. M. I. Mahlia, and M. H. Saidi. "A New Approach to Exergy Analyses of a Hybrid Desiccant Cooling System Compares to a Vapor Compression System." Applied Mechanics and Materials 110-116 (October 2011): 2163–69. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2163.

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In the recent researches HVAC with a based desiccant dehumidifier with a low ambient impact is more efficient in comparison to the traditional systems. Hybrid desiccant cooling systems can be used to control indoor air quality in buildings. This paper presents an integrated energy, entropy and exergy analysis of a hybrid desiccant cooling system compare to a compression system based on first and second laws of thermodynamic. The main objective is the use of a method called exergy costing applied to a conventional compression system that has been chosen to provide the proper conditioned air for a building in hot and humid condition. By applying the same method for the equivalent hybrid cooling system and finding the same exergy costing parameters, two systems can be in comparison to find the more economical system. The result illustrated hybrid desiccant cooling system can be providing 19.78% energy saving and 14.5% cheaper than the compression system the same capacity and lifetime. Nomenclature:
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Lo¨f, George O. G., Gerald Cler, and Thomas Brisbane. "Performance of a Solar Desiccant Cooling System." Journal of Solar Energy Engineering 110, no. 3 (1988): 165–71. http://dx.doi.org/10.1115/1.3268252.

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A solar desiccant cooling system was operated at the Solar Energy Applications Laboratory, Colorado State University, throughout the 1986 summer. The system comprises an American Solar King fresh air heating/desiccant evaporative cooling unit, a Sunmaster evacuated tube solar collector, hot water solar storage tank, auxiliary electric boiler, controls, and accessories. The cooling unit is operated in the ventilation mode, fresh air being dried in a rotating desiccant matrix, and cooled by heat exchange and evaporative cooling. Return air is used as a cooling medium in a rotating heat exchange matrix, heated by solar energy in a heat exchange coil, and discarded through the rotating desiccant bed. The solar-driven system provided over 90 percent of the seasonal cooling requirements in an experimental, residence type building at average COP levels of 1.0 and solar collection efficiencies of 50 percent when supplied with solar heated water at temperatures of 50 to 65° C. Detailed operating results, including total and average solar cooling provided, coefficients of performance, and overall solar cooling performance ratios are presented.
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Epstein, M., M. Grolmes, K. Davidson, and D. Kosar. "Desiccant Cooling System Performance: A Simple Approach." Journal of Solar Energy Engineering 107, no. 1 (1985): 21–28. http://dx.doi.org/10.1115/1.3267648.

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A simple algebraic model of wave motion arising in the adiabatic fixed-desiccant bed dehumidification of an air stream is applied to the prediction of the performance potential of a desiccant air conditioning system. The model is used to explain the increase in cooling system performance that has been realized through the use of mixed inert-desiccant material adsorption beds. The response of cooling system performance to changes in external process conditions is examined and conclusions are drawn relative to optimization of system characteristics.
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Zou, Tong Hua, Min Wang, Sai Feng Deng, and Yong Li. "Research Progress of Liquid Desiccant Evaporative Cooling Air Conditioning System." Advanced Materials Research 732-733 (August 2013): 531–36. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.531.

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Evaporative cooling technology is a refrigeration technology by water evaporating endothermic, with zero-pollution, environmental-friendly, energy saving, and other advantages, which makes it widely used. Nevertheless, due to its working characteristic, the application of evaporative cooling technology is limited, particularly in some areas with high humidity. Using the liquid desiccant dehumidification and evaporative cooling technology leads to a solution, named liquid desiccant evaporative cooling air conditioning system extends the application of evaporative cooling technology. This article on liquid desiccant evaporative cooling system provides a brief overview about research status, full usage of the low grade thermal energy, the practical application and new development of the system.
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Dissertations / Theses on the topic "Desiccant cooling system"

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Qiu, Guoquan. "A novel evaporative/desiccant cooling system." Thesis, Nottingham Trent University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444606.

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Artieda, Urrutia Juan. "Desiccant Cooling Analysis : Simulation software, energy, cost and environmentalanalysis of desiccant cooling system." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-6994.

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Desiccant cooling is a technology that, based on a open psychrometric cycle, is able to provide cooling using heat as the main energy carrier. This technology uses a considerably smaller amount of electricity than refrigerators based on the vapor-compression cycle, which is an electricity driven cycle. Electricity is often more expensive than other types of energy and has CO2 emissions associated with its generation , so desiccant cooling has the potential of achieving both economic and environmental benefits. In addition to this, the heat the desiccant cooling cycle needs to work can be supplied at relative low temperatures, so it can use heat coming from the district heating grid, from a solar collector or even waste heat coming from industries. The system which will be studied in this report is a desiccant cooling system based on the model designed by the company Munters AB. The systems relies on several components: a desiccant rotor, a rotary heat exchanger two evaporative humidifiers and two heating coils. It is a flexible system that is able to provide cooling in summer and heat during winter. This study performs a deep economic and environmental analysis of the desiccant cooling systems, comparing it with traditional vapor compression based systems: In order to achieve this objective a user-friendly software was created, called the DCSS – Desiccant Cooling Simulation Software – that simulates the operation of the system during a year and performs automatically all the necessary calculations. This study demonstrates that economic savings up to 54% percent can be achieved in the running costs of desiccant cooling systems when compared to traditional compressor cooling systems, and  reductions up to39% in the CO2 emissions. It also demonstrates that desiccant cooling is more appropriate in dry climate zones with low latent heat generation gains. In addition to that, the DSCC software created will help further studies about the physical, economic and environmental feasibility of installing desiccant cooling systems in different locations.
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Liu, Shuli. "A novel heat recovery/desiccant cooling system." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/11602/.

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The global air temperature has increased by 0.74± 0.18 °C since 1905 and scientists have shown that CO2 accounts for 55 percentages of the greenhouse gases. Global atmospheric CO2 has been sharply increased since 1751, however the trend has slowed down in last fifty years in the Western Europe. UK and EU countries have singed the Kyoto agreement to reduce their greenhouse gas emissions by a collective average of 12.5% below their 1990 levels by 2020. In the EU, 40% of CO2 emission comes from the residential energy consumption, in which the HVAC system accounts for 50%, lighting accounts for 15% and appliances 10%. Hence, reducing the fossil-fuel consumption in residential energy by utilizing renewable energy is an effective method to achieve the Kyoto target. However, in the UK renewable energy only accounts for 2% of the total energy consumption in 2005. A novel heat recovery/desiccant cooling system is driven by the solar collector and cooling tower to achieve low energy cooling with low CO2 emission. This system is novel in the following ways: • Uses cheap fibre materials as the air-to-air heat exchanger, dehumidifier and regenerator core • Heat/mass fibre exchanger saves both sensible and latent heat from the exhaust air • The dehumidifier core with hexagonal surface could be integrated with windcowls/catchers draught • Utilises low electrical energy and therefore low CO2 is released to the environment The cooling system consists of three main parts: heat/mass transfer exchanger, desiccant dehumidifier and regenerator. The fibre exchanger, dehumidifier and regenerator cores are the key parts of the technology. Owing to its proper pore size and porosity, fibre is selected out as the exchanger membrane to execute the heat/mass transfer process. Although the fibre is soft and difficult to keep the shape for long term running, its low price makes its frequent replacement feasible, which can counteract its disadvantages. A counter-flow air-to-air heat /mass exchanger was investigated and simulation and experimental results indicated that the fibre membranes soaked by desiccant solution showed the best heat and mass recovery effectiveness at about 89.59% and 78.09%, respectively. LiCl solution was selected as the working fluid in the dehumidifier and regenerator due to its advisable absorption capacity and low regeneration temperature. Numerical simulations and experimental testing were carried out to work out the optimal dehumidifier/regenerator structure, size and running conditions. Furthermore, the simulation results proved that the cooling tower was capable to service the required low temperature cooling water and the solar collector had the ability to offer the heating energy no lower than the regeneration temperature 60℃. The coefficient-of-performance of this novel heat recovery/desiccant cooling system is proved to be as high as 13.0, with a cooling capacity of 5.6kW when the system is powered by renewable energy. This case is under the pre-set conditions that the environment air temperature is 36℃ and relative humidity is 50% (cities such as Hong Kong, Taiwan, Spain and Thailand, etc). Hence, this system is very useful for a hot/humid climate with plenty of solar energy. The theoretical modelling consisted of four numerical models is proved by experiments to predict the performance of the system within acceptable errors. Economic analysis based on a case (200m2 working office in London) indicated that the novel heat recovery/desiccant cooling system could save 5134kWh energy as well as prevent 3123kg CO2 emission per year compared to the traditional HVAC system. Due to the flexible nature of the fibre, the capital and maintenance cost of the novel cooling system is higher than the traditional HVAC system, but its running cost are much lower than the latter. Hence, the novel heat recovery/desiccant cooling system is cost effective and environment friendly technology.
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Tan, Junyi, and 譚軍毅. "Investigation of novel liquid desiccant cooling system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42664251.

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Tan, Junyi. "Investigation of novel liquid desiccant cooling system." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42664251.

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Abou-Khamis, Kamal A. "Analysis and Design of Desiccant Cooling Systems." Youngstown State University / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ysu999701887.

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Ibrahim, Munzer. "Solar Powered Air Conditioning System." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-39522.

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Bader, Tobias. "Solar desiccant evaporative cooling with multivalent use of solar thermal heat." Thesis, De Montfort University, 2014. http://hdl.handle.net/2086/10891.

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Solar DEC (Desiccant and Evaporative Cooling) air-conditioning is a renewable technological approach to the future air-conditioning of buildings driven with solar-thermal heat. The principal acceptance of solar airconditioning has led to system prototypes mainly across Europe, however the diffusion of this innovative technology is proceeding slowly due to little field testing experience. In climates with coexisting heating demand particularly, a multivalent system approach that utilizes solar-heat not only for air-conditioning but also for hot water preparation and heating has potential as a feasible concept. However, previous research focused on systems using solar heat exclusively for the DEC-process. This research contributes to the advancement of the solar DEC-technology with multivalent use of solar thermal heat. The investigation consists of an initial detailed in-situ monitoring analysis of a system prototype operated in an industrial environment, followed by the development of optimised system concepts and a climate-specific analysis of the solar DEC-technology. The monitoring provided in-depth knowledge about the system operation, revealing the reasons for the insufficient refrigeration capacity achieved in practice. A detailed simulation model for an entire multivalent solar DEC-system including the heat sinks, DEC-system, heating and hot-water preparation was developed and a DEC-control strategy has been formulated. A new optimised control strategy for multivalent systems with simultaneous sink supply concept was devised. A sensitivity analysis was carried out to investigate the key design parameters for the dimensioning of multivalent solar DEC-systems. The research concluded that the auxiliary primary energy consumption of the optimised system was lower by one third compared to the initial system. Finally, a methodological zoning approach was developed, to systematically produce design-specific outline data for the application of the solar DEC-technology at climatically different sites.
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Bakmeedeniya, Lekha Udayanganie. "MODELLING POLYGENERATION WITH DESICCANT COOLING SYSTEM FOR TROPICAL (AND SUB - TROPICAL) CLIMATES." Thesis, KTH, Energiteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-43253.

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Modelling Polygeneration with Desiccant Cooling System for Tropical(and Sub Tropical) ClimatesAbstractSpace cooling has become a necessity in tropical countries. Maintainingcomfortable indoor conditions in industrial environments incur high energy bills due toheavy dependency on electrically operated air conditioning systems. In order to exploreways and means to improve the energy efficiency and alternative energy resources, afeasibility study was conducted using a transient simulation software TRNSYS toimplement a combined cooling, heating and power system suitable for a tropicalcountry.It is proven from the literature search that desiccant dehumidification inconjunction with evaporative coolers can reduce air conditioning operating costssignificantly since the energy required to power a desiccant cooling system is small andthe source of this required energy can be diverse.(Low exergy heat such as solar, wasteheat and natural gas)This research is conducted to evaluate the performance and applicability ofdesiccant cooling systems under tropical climatic conditions. Two operating modes;ventilation and recirculation modes of solid desiccants based open cycle air conditioningthat use waste heat from a CHP plant are analysed to understand their operatingranges, performances and applicability. The model developed is used to propose asuitable desiccant cooling system for a selected industry environment in Sri Lanka.Preliminary results obtained by a parametric analysis for weather data for Colombo, SriLanka shows 0.95 and 1.02 optimum coefficients of performance for the ventilation andrecirculation modes respectively when heat is available at 85°C. Based on thecomparisons of the analysis it is seen that the desiccant cooling appears to be a logicalsupplement for space cooling applications in tropical climates like Sri Lanka. And for thecase study taken to investigate can be proposed with a desiccant cooling system with ahot water storage as the energy supply and it can maintain a COP of about 0.48 undertropical weather conditions.
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Lychnos, Georgios. "Feasibility of a solar panel-powered liquid desiccant cooling system for greenhouses." Thesis, Aston University, 2010. http://publications.aston.ac.uk/15254/.

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To investigate the technical feasibility of a novel cooling system for commercial greenhouses, knowledge of the state of the art in greenhouse cooling is required. An extensive literature review was carried out that highlighted the physical processes of greenhouse cooling and showed the limitations of the conventional technology. The proposed cooling system utilises liquid desiccant technology; hence knowledge of liquid desiccant cooling is also a prerequisite before designing such a system. Extensive literature reviews on solar liquid desiccant regenerators and desiccators, which are essential parts of liquid desiccant cooling systems, were carried out to identify their advantages and disadvantages. In response to the findings, a regenerator and a desiccator were designed and constructed in lab. An important factor of liquid desiccant cooling is the choice of liquid desiccant itself. The hygroscopicity of the liquid desiccant affects the performance of the system. Bitterns, which are magnesium-rich brines derived from seawater, are proposed as an alternative liquid desiccant for cooling greenhouses. A thorough experimental and theoretical study was carried out in order to determine the properties of concentrated bitterns. It was concluded that their properties resemble pure magnesium chloride solutions. Therefore, magnesium chloride solution was used in laboratory experiments to assess the performance of the regenerator and the desiccator. To predict the whole system performance, the physical processes of heat and mass transfer were modelled using gPROMS® advanced process modelling software. The model was validated against the experimental results. Consequently it was used to model a commercials-scale greenhouse in several hot coastal areas in the tropics and sub-tropics. These case studies show that the system, when compared to evaporative cooling, achieves 3oC-5.6oC temperature drop inside the greenhouse in hot and humid places (RH>70%) and 2oC-4oC temperature drop in hot and dry places (50%
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Books on the topic "Desiccant cooling system"

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IEA Workshop on Air Quality, Desiccant, and Evaporative Cooling Systems. (1991 Orlando, Fla.). Final report on IEA Workshop on Air Quality, Desiccant, and Evaporative Cooling Systems, Orlando, January 14-16, 1991. Edited by Andersson Johnny V, International Energy Agency, International Energy Agency. Working Party on End-Use Technologies., and Statens råd för byggnadsforskning (Sweden). Swedish Council for Building Research, 1992.

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Barlow, A. Analysis of the Absorption Process and of Desiccant Cooling Systems: A Pseudo-Steady State Model for Coupled Heat and Mass Transfer. Amer Solar Energy Society, 1985.

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Book chapters on the topic "Desiccant cooling system"

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Liu, Xiaohua, and Yi Jiang. "Application of Liquid Desiccant System." In Desiccant-Assisted Cooling. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5565-2_9.

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Zainal, A. Z., and A. S. Binghooth. "Desiccant Dehumidification Integrated with Hydronic Radiant Cooling System." In Desiccant-Assisted Cooling. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5565-2_8.

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Ruivo, C. R., J. J. Costa, and A. R. Figueiredo. "Influence of Altitude on the Behavior of Solid Desiccant Dehumidification System." In Desiccant-Assisted Cooling. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5565-2_4.

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Xu, M. M., and H. Li. "Solar Desiccant Cooling System." In Handbook of Energy Systems in Green Buildings. Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-49120-1_30.

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Xu, M. M., and H. Li. "Solar Desiccant Cooling System." In Handbook of Energy Systems in Green Buildings. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49088-4_30-1.

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Lulić, Haris, and Adnan Đugum. "Simulation of Solar Assisted Solid Desiccant Cooling System." In Advanced Technologies, Systems, and Applications V. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54765-3_34.

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Tashiro, Y., M. Kubo, Y. Katsumi, T. Meguro, K. Komeya, and J. Tatami. "Characteristics of Dehumidifier Sheets for an Adsorptive Desiccant Cooling System." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406038.ch25.

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Benhamza, Tayeb, Maamar Laidi, and Salah Hanini. "Modeling of an Improved Liquid Desiccant Solar Cooling System by Artificial Neural Network." In Artificial Intelligence in Renewable Energetic Systems. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73192-6_35.

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Worek, W. M., and A. Lowenstein. "Status of Liquid-Desiccant Technologies and Systems." In Desiccant-Assisted Cooling. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5565-2_2.

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Kumar, Sanjeev, Faizan Ahmad, and Minesh Vohra. "Experimental Investigation on Hybrid Liquid Desiccant Cooling System for Hot and Humid Climatic Conditions of India." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3132-0_13.

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Conference papers on the topic "Desiccant cooling system"

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Christodoulaki, Roza I., Emmanuil D. Rogdakis, and Irene P. Koronaki. "Hybrid Liquid Desiccant/Vapour Compression Air-Conditioning Systems: A Critical Review." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59344.

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Hybrid Liquid Desiccant Cooling / Vapour Compression Systems is an environmentally friendly technology used to condition the internal environment of buildings. In contrast to conventional vapor compression air conditioning systems, in which the electrical energy drives the cooling cycle, desiccant cooling is heat driven; therefore, hybrid LDC/VCS have the potential to utilise cleaner energy sources such as gas, hot water, waste heat or solar thermal energy. In hybrid LDC/VCS, the latent cooling load is handled by the desiccant dehumidifier, while the sensible is handled by a conventional VCS. Hybrid systems combining liquid desiccant cooling with Vapor Compression Systems, Vapor Absorption Systems and Solar Collectors use less electrical energy compared to conventional air-conditioning alone, while these savings rise as the latent load increases. Unlike other surveys on desiccant cooling, this review focuses on a detailed coverage of the hybrid LDC/VC systems. Commonly used liquid desiccants are compared towards their physical properties. Hybrid LDC/VCS employing various components and features are summarized, while different system configurations are schematically presented. Key factors for the hybrid system performance are the desiccant material, the design variables and the conduction of experiments prior to operation.
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Ко, Y. J., D. Charoensupaya, and Z. Lavan. "OPEN-CYCLE DESICCANT COOLING SYSTEM WITH STAGED REGENERATION." In International Heat Transfer Conference 9. Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.560.

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Yun, Changho, Joon Ahn, and Byung Ha Kang. "Cooling and Dehumidification Characteristics of Desiccant Cooling System in a Residential Environment." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-08015.

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Desiccant and water evaporation based cooling system is recently suggested as an alternative to refrigeration systems using typical vapor compression cycle for the purpose of energy saving and greenhouse gas reduction. The system receives the heat for the regeneration of the rotor from district heating, which is waste heat from a CHP plant or an incineration plant. KDHC (Korea District Heating Corporation) installed 4 systems at 4 individual houses in Su-Won, Korea and conducted field tests from Aug. 2010 to Sep. 2010. In this study, indoor conditions have been measured when the system is off as well as in operation. Also indoor conditions have been characterized according to outdoor conditions and users’ operation. Referring the ASHRAE standard, the cooling system in operation has been checked whether it could make indoor conditions comfortable or not. By analyzing the monitored variables, performance characteristics of the system were figured out. Major characteristics such as cooling capacity, heat & electricity consumption, and the COP of the system have been compared with those from the previous laboratory experiment.
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Okposio, David, A. G. Agwu Nnanna, and Harvey Abramowitz. "Net-Zero Water (NZW) Reuse Desiccant Assisted Evaporative Cooling System for Data Centers." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11870.

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Abstract The cooling effect of evaporative cooling systems is well documented in literature. Evaporative cooling however introduces humidity into the cooled space, which is unsuitable for data centers. Desiccants (liquid, solid or composites) adsorb moisture from the cooled air to control humidity and is regenerated using waste heat from the data center. This work is an experimental and theoretical investigation of the use of desiccant assisted evaporative cooling for data center cooling according to ASHRAE thermal guideline TC 9.9 . The thickness of the cooling pads is varied with specific surface area, velocity of air through the pad measured, the product of the air velocity and surface area yields the volumetric flowrate of the air, the water flow rate varied as well. The configuration is such that the rotary desiccant wheel (impregnated with silica gel) comes after the evaporative cooler. A novel water recovery system using the Peltier effect is proposed to recover moisture from the return air stream thereby optimizing the water consumption of evaporative cooling technology and providing suitable air quality for data center cooling.
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Zadpoor, Amir Abbas, and Ali Asadi Nikooyan. "Development of an Improved Desiccant-Based Evaporative Cooling System for Gas Turbines." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50258.

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The evaporative inlet cooling systems used for inlet cooling of gas turbines during hot summers do not work well in humid areas. However, desiccant wheels can be used to dehumidify the air before passing it trough the evaporative cooler. Since the desiccant wheels work adiabatically, the resulting air is hotter than the air introduced to the wheel and an evaporative cooling system is used to cool down the dehumidified air. Combined direct and indirect evaporative coolers have been already used to investigate the effects of dehumidification on the effectiveness of the evaporation cooling systems. It is shown that a single desiccant wheel does not offer much higher effectiveness compared to the multiple-stage evaporative systems. In this paper, an improved version of the desiccant inlet cooling system is presented. Additional dehumidification and indirect evaporative cooling stages are added to increase the effectiveness of the inlet cooling. A typical gas turbine cycle along with an industrial gas turbine with actual performance curves are used to simulate the thermal cycle in presence of the different inlet cooling systems. The simulations are carried out for three different climatic conditions. The improved and original desiccant-based systems are compared and it is shown that the added stages substantially improve the effectiveness of the desiccant-based inlet cooling.
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Al-Sulaiman, Faleh A., and P. Gandhidasan. "Energy Analysis of Liquid Desiccant Based Evaporative Cooling System." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79163.

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This paper presents preliminary findings of the energy analysis of a cooling system with multistage evaporative coolers using liquid desiccant dehumidifier between the stages. The proposed evaporative cooling system utilizes the air humidity for cooling in humid areas and requires no additional water supply. The major energy requirement associated with this cooling system is the energy for regenerating the weak liquid desiccant. In this paper two types of energy namely thermal energy as well as mechanical energy are considered for regeneration. For thermal energy, the heat input for regeneration is supplied from the conventional energy sources such as a simple line heater. Reverse osmosis (RO) process is considered for regeneration by mechanical energy and MFI zeolite membrane is proposed for separation of water from the weak desiccant solution. Energy analysis has been carried out for both methods of regeneration. The results show that the energy consumption is about 25% less for the mechanical regeneration system with 3 % recovery than the thermal energy regeneration system to increase the desiccant solution temperature of 22°C. The COP of the proposed cooling system is defined as the cooling effect by the mass rate of water evaporated in the system divided by the amount of energy supplied to the system, that is, the COP is independent of the energy source.
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Koronaki, I. P., R. I. Christodoulaki, V. D. Papaefthimiou, and E. D. Rogdakis. "Preliminary Investigation of a Liquid Desiccant System for Dehumidification and Cooling in Athens." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63376.

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Liquid desiccant air conditioning systems have recently been attracting attention due to their capability of handling the latent load without super-cooling and then reheating, as happens in the conventional compression-type air conditioning systems. In liquid desiccant cooling cycles, a sorbent solution is employed to dehumidify the air, circulating between the two critical components; the dehumidifier and the regenerator. As the strong desiccant solution is sprayed on top of the internally cooled dehumidifier, it flows down by gravity and comes in contact with the process air. The desiccant solution which, by definition, has a strong affinity for water vapor absorbs moisture from the air. The end of the process finds the air cool and dehumidified and the solution diluted. The diluted desiccant solution enters the regenerator in order to retrieve its initial concentration. Hot water derived from a low temperature source supplies the necessary heat to the solution and the excessive water content is evaporated. At the end of the process, the hot humid air is rejected to the ambient and the concentrated solution is driven to the dehumidifier. The complex heat and mass transfer phenomena, occurring both in the dehumidifier and regenerator, has been the subject of earlier work by the authors. Based on the knowledge gained, a liquid desiccant system was installed at the National Technical University of Athens, Laboratory of Applied Thermodynamics, for experimental purposes. The liquid desiccant system was constructed by the German company L-DCS [1]. The main components of the system are the dehumidifier, the regenerator and the evaporative cooler. The system uses water as the cooling medium and LiCl solution as the desiccant. It also employs two storage tanks, one for the concentrated solution and one for the diluted. The purpose of this publication is to present the newly installed liquid desiccant system, to predict the performance of the dehumidifier and to carry out preliminary design optimization.
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Concina, Wendell, Suresh Sadineni, and Robert Boehm. "Solar Assisted Desiccant Cooling Simulation for Different Climate Zones." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54296.

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Evaporative cooling is among the most cost effective methods of air conditioning, but is less efficient in humid climates. An evaporative system coupled with a desiccant wheel can operate effectively in broader climatic conditions. These cooling systems can substitute traditional vapor compression air conditioning systems as they involve environmentally friendly cooling processes with reduced electricity demand (which is commonly generated from fossil fuels) along with no harmful CFC based refrigerant usage. Furthermore, direct utilization of low grade energy sources such as solar thermal energy or flue gas heat can drive the desiccant regeneration process, thus providing economic benefits. This study presents the results of simulations of desiccant cooling system performance for different climate zones of the United States. Solar assisted desiccant air conditioning is particularly useful where there are abundant solar resources with high temperature and humidity levels. Building energy simulations determined cooling energy requirements for the building. Simulation of an evacuated solar hot water collector model provided the heat energy available for regeneration of the desiccant. Solid desiccant of common material such as silica gel used in a rotary wheel is simulated using established validated computer models; this is coupled with evaporative cooling. Transients of the overall system for different cooling loads and solar radiation levels are presented. Finally, feasibility studies of the desiccant cooling systems are presented in comparison with traditional cooling system. Further analysis of the data presents optimization opportunities. Energy savings were achieved in all climatic conditions with decreased effectiveness in more humid conditions.
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Mago, Pedro, and D. Yogi Goswami. "A Study of the Performance of a Hybrid Liquid Desiccant Cooling System Using Lithium Chloride." In ASME 2001 Solar Engineering: International Solar Energy Conference (FORUM 2001: Solar Energy — The Power to Choose). American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/sed2001-118.

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Abstract A hybrid desiccant system using aqueous lithium chloride was studied by simulation, laboratory test, and field tests. This paper presents field test of a hybrid solar liquid desiccant cooling system conducted at a test house at the University of Florida’s Energy Research and Education Park. These tests consisted of operating the air conditioning system at the test house in two configurations: the conventional vapor compression system and the hybrid desiccant system. For each configuration the system was operated in two modes: recirculation, and 100% ventilation air. Experiments were conduct to study the influence of the air mass flow rate, temperature of the inlet air, temperature of the desiccant, and desiccant mass flow rate on the performance of both system configurations. Based on the field test results it was found that the hybrid desiccant system improves the air conditioning performance in the field test house by decreasing the outlet humidity and temperature of the air. It was also found that the hybrid desiccant cooling system is more cost effective for the case 100% fresh air ventilation than recirculation.
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Koronaki, I. P., R. I. Christodoulaki, V. D. Papaefthimiou, and E. D. Rogdakis. "Thermodynamic Analysis of a Liquid Desiccant Cooling System Under Mediterranean Climatic Conditions." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85577.

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Liquid desiccant air conditioning systems have recently been attracting attention, owing to their merits in handling the latent heat. Desiccant systems avoid not only the energy penalty caused by overcooling and reheating, but also the bacteria generation caused by condensed water. They can also significantly reduce the electricity peak load caused by conventional compression type air conditioning systems, especially in hot and humid regions. Desiccant systems are thus more energy efficient, healthy and environmentally friendly than conventional mechanical cooling. This paper presents the results from a theoretical study of a liquid desiccant system that provides air conditioning to a typical office building. A coupled heat and mass transfer analytical model was developed, based on the Runge-Kutta fixed step method, to predict the performance of the device under Mediterranean conditions. A parametric analysis was implemented to investigate the effects of ambient temperature and humidity ratio on the dehumidification mass rate, the load coverage and the thermal COP of the system. Simulation results showed that under hot and humid weather, the COP reaches its maximum value, 1.075. However, as the weather becomes more humid, the latent load coverage of the system is decreased and as it becomes hotter, the sensible load coverage of the system is decreased. The maximum latent load coverage, 91.8%, happened at 40°C, 0.011kgw/kgdα. Results can be useful for researchers and engineers.
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Reports on the topic "Desiccant cooling system"

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Fernandez, M., and R. Heimann. Pilot Demonstration Test Bed for ICC Desiccant Based Cooling System Final Report CRADA No. TSB-737-93. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1426079.

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Collier, R. K. Jr. Desiccant dehumidification and cooling systems assessment and analysis. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/555262.

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DiBella, F., K. Patch, and F. Becker. Desiccant-based, heat actuated cooling assessment for DHC systems. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5685616.

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Patch, K. D., F. A. DiBella, and F. E. Becker. District Heating and Cooling Technology Development Program: Phase 2, Investigation of reduced-cost heat-actuated desiccant cooling systems for DHC applications. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6907693.

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Loef, G., S. Beba, G. Cler, M. Birdsong, and B. McLay. Performance of solar heating and cooling systems: Solid desiccant cooling/fresh air heating with evacuated-tube collectors in CSU Solar House I. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/5205235.

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Patch, K. D., F. A. DiBella, and F. E. Becker. District Heating and Cooling Technology Development Program: Phase 2, Investigation of reduced-cost heat-actuated desiccant cooling systems for DHC applications. Final report, August 20, 1990--January 1, 1992. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10103767.

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