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Dissertations / Theses on the topic 'CASCADE REFRIGERATION SYSTEM'

Author: Grafiati

Published: 11 September 2023

Last updated: 25 July 2025

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1

Schutte, Abraham Jacobus. "Demand-side energy management of a cascade mine surface refrigeration system / A.J. Schutte." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1843.

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The investigations focus on load shifting, load clipping and energy efficiency through control strategies. Load shifting is achieved by increasing the amount of work done in the Eskom non-peak period. This then results in a decrease in the Eskom peak time work load. The mine refrigeration system is modelled and verified with the data. A simulation is made from the model and the simulation is used to develop the new control strategy and new operational parameters. Predicted results are verified to be within production operational constraints. A case study was carried out to prove the effectiv

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2

Sawalha, Samer. "Carbon Dioxide in Supermarket Refrigeration." Doctoral thesis, Stockholm : Energiteknik, Energy Technology, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4753.

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3

Haile-Michael, Getu. "Cascade and secondary coolant supermarket refrigeration systems : modelling and new frost correlations." Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/6846.

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Nowadays traditional (direct expansion) supermarket refrigeration systems are mostly employed in supermarket establishments for refrigerating food products and beverages in the store. However, the installations of long piping system, fittings and joints in traditional systems are causing substantial refrigerant losses. The refrigerant losses in turn bring about cost and high environmental damage in terms of ozone layer depletion and global warming potential. Additionally, defrosting of air-coils is one of the most energy consuming processes in supermarket refrigeration systems due to sus

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4

Скрипник, О. В., В. В. Свяцький, O. Skrypnyk та V. Sviatskyi. "Перспективні напрямки технологічного застосування гідратів двооксиду вуглецю". Thesis, ХНТУ, 2017. http://dspace.kntu.kr.ua/jspui/handle/123456789/6869.

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Наведено аналіз останніх досліджень і приклади застосування газових гідратів двооксиду вуглецю. Наведено приклад можливості заміщення двооксидом вуглецю метану у природніх гідратах, організовуючи контрольований видобуток метану із субаквальних газогідратних покладів. Розглянуто питання про обмеження викиду парникових газів за рахунок їх уловлювання і зберігання за допомогою технології CCS (Carbon Capture and Storage). Наведено приклад каскадних систем на базі аміаку з двооксидом вуглецю із сумішами вуглеводнів як основу холодильних установок для одержання глибокого холоду. Розглянуто спосіб ви

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5

Tsung-Chiuan, Chen陳宗權, and 陳宗權. "Research of Cascade Refrigeration System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/gtmpzu.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>100<br>The Cryogenic systems use cascade system, thus reducing the compression ratio. As the volume of the compressors in two stages is decreased, the wasted work is reduced relatively, so that the energy can be saved, and the system operating temperature can be reached easily. Therefore, this study used the cascade refrigeration system available on the market for hardware design, control strategy and refrigerant collocation, in order to meet the appropriate operating conditions of this system design. Due to the faults of the original system compressor and co

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6

Chiang, Fu-Lin, and 江富麟. "Cascade Refrigeration System Reaearch of Freeze Dryer." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/5xyjg9.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>97<br>Refrigeration system has a long history, and vacuum freeze-drying is a technology used for drying, color protection, fresh keeping, or nutrition preservation of food, biologics, biomaterials, or micro/nano materials, So Freeze-drying systems to be used for some time. But most operating temperature to the systems are -50℃, besides, old machines have only one cold trap chamber, if we want to remove the ice on cold trap, we will shutdown the machines, then Production process will be delayed. This thesis is focused on improving the cascade vacuum Freeze-dry

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7

Lin, Shian-Tzong, and 林憲宗. "Performance Analysis of R717/HC Cascade Refrigeration System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/sme3j6.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>98<br>Low-temperature storage refrigeration system is vital for much industry range. The traditional single-stage vapor compressor system is not suitable for low-temperature system; therefore, it should be used through cascade refrigeration system. For many years, as a result of environmental protection issue related global warning and depletion of ozone layer caused by the use of synthetic refrigerants (CFC’s, HCFC’s and HFC’s), the return to the use of harmless natural substances is a must to alternative refrigerants in refrigeration systems. Ammonia (R717)

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8

Hsieh, Cheng-Chih, and 謝承志. "Study of Expansion Valve on Cascade Refrigeration System Performance." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/442s6p.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>102<br>The cascade refrigeration systems are widely applied in Taiwan, for use in air conditioning, refrigeration and food processing, pharmaceuticals, chemicals, machinery, etc. More attention recently, So this thesis refrigeration components easily available in the market to buy the dual refrigeration system developed for conducted to explore various expansion valve of the refrigerant flow. The system of high and low temperature circulation system individually in four A, B, C and D expansion valve testing, in order to best binary refrigerating system expans

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9

Cheng, Po-Jen, and 鄭博仁. "Analysis of Improving the Performance of Cascade Refrigeration System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/rx22f2.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>102<br>This paper examines how the common refrigerant R-134a and the non-azeotropic refrigerant R-404A perform in a binary refrigeration with the addition of a refrigerant precooler and a desuperheater and the changes in the system with the added refrigerants before and after subcooling through experiments and comparison. Inferences are made on the viability of installing a ‘refrigerant precooler’ in the refrigerant system through theoretical analysis of changes in the coefficient of performance (COP) of the system in the subcooled and superheated states. The

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10

Chiou, Chi-Han, and 邱祈翰. "Study of an Auto - Cascade Refrigeration System with Refrigerant Mixtures." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/83760711606136132132.

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碩士<br>國立交通大學<br>機械工程系<br>89<br>The objective of this research is to design a auto-cascade refrigeration system with zeotropic refrigerant mixtures R-32/R-134a（30/70 wt％）, which might reach a low temperature —40℃. This system utilizes only one single compressor with a phase separator in order to shift the concentration contents of the refrigerant mixtures .The vapor phase flows through a cascade heat exchanger and exchanges latent heat with the low temperature liquid phase after expansion. Then, the mixture rich with higher boiling component flows into the evaporator to create the low temperatu

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11

Tsai, Meng-Ying, and 蔡孟穎. "The application of cascade refrigeration system in the development for refrigeration, hot water and steam in convenience shops." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/pmzb25.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>100<br>The study aims at providing convenient stores with the required energy for cooling, freezing, and supply of hot water and steam through acascade refrigeration system composed of HFC-134a and HFC-245fa refrigerants. In the experiment, the paper makes use of the feasibility of producing hot water and steam and raising the coefficient of performance (COP) of low temperature system by the high temperature feature of HFC-245fa refrigerant. Through planning of static and dynamic testing conditions, the paper designs the complete experimental methods and pr

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12

Kuo, Ming-Chang, and 郭銘昌. "Optimum Allocation of Heat-Exchanger Thermal Conductance in CO2/NH3 Cascade Refrigeration System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/3b649q.

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碩士<br>國立臺北科技大學<br>冷凍空調工程系所<br>94<br>This study mainly discusses the optimum allocation of heat-exchanger thermal conductance in CO2/NH3 cascade refrigeration systems, such as evaporative, cascade condenser, condenser. Using cold-water temperature, chillier fluid temperature, cool capacity and total thermal conductance as conditional parameters, this research built three models of Reversed Carnot Cycle and Ideal Vapour Compressor Refrigeration Cycle and Real Vapour Compressor Refrigeration Cycle, which followed thermo dynamics analysis and Klein thermal conductance equation. The system produced

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13

Chung, Jenn Chyi, and 鐘震麒. "Study on Energy Saving of Appling Cascade System on Walk-in Refrigeration Show Cabinet." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/51912954238237127949.

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碩士<br>國立臺北科技大學<br>冷凍與低溫科技研究所<br>91<br>Refrigerated display cabinets are widely used in 24-hr convenience store in Taiwan. In this research, we built a 5 in 1 closed type walk-in refrigerated display cabinet and its compression refrigeration system, which including traditional single stage compression system and cascade refrigeration system, to evaluate their system performance. The results of the performance test showed that the cascade refrigeration system adopting R134a and R507 combination has better system performance than the combination of R134a and R404A, and the power consumption test

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14

Yen, Chia-Houng, and 顏家宏. "Study of two Auto-Cascade Refrigeration System with Refrigerant Mixture R-32/R-134a." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/3umbv7.

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碩士<br>國立交通大學<br>機械工程系所<br>92<br>The objective of this research is to design a two auto-cascades refrigeration system with refrigerant mixture R-32/R-134a in which two phase separators and two heat exchangers are used to raise the concentration of the richer R-32 mixture flow through the evaporator in order to achieve the low temperature cooling , only utilize a 1.5HP compressor to support system power consumption. In comparison with the one-cascade system , test results for a R-32/R-134a(30/70 wt%) two cascades loop , showed an increase of only 2.14 % in the power consumption , and a cop valve

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15

Chiang, Chi Feng, and 江奇峰. "Cascade Refrigeration System with Refrigerant Mixtures using a Liquid Over Feeding Accumulator Heat Exchanger." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/07922647873631590883.

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碩士<br>國立交通大學<br>機械工程系<br>91<br>The objective of this research is to design and improve the efficiency of the cascade refrigeration system with zeotropic refrigerant mixtures. This system utilizes a single compressor with R-32/R-134a refrigerant mixtures. Phase separator is put in this system in order to change the concentration of refrigerant mixtures. The vapor phase flows through a cascade heat exchanger and exchanges latent heat with the low temperature liquid phase after expansion. Then, the higher-boiling-component mixture flows into the evaporator to create the low temperatur

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16

ANAND, SAURABH. "COMPARATIVE ANALYSIS OF THERMODYNAMICS PERFORMANCE OF CASCADE REFRIGERATION SYSTEM FOR REFRIGERANT COUPLE R23/R290 AND R23/R600A." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16950.

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This study presents a comparative analysis of thermodynamic performance of cascade refrigeration systems (CRSs) for refrigerant couples R23/R290 and R23/R600A to discover whether R600A is a suitable substitute for R290. The discharge temperature, input power of the compressor, coefficient of performance (COP), exergy loss (X) and exergy efficiency (g) are chosen as the objective functions. The operating parameters considered in this thesis include condensing temperature, evaporating temperature in both high-temperature cycle i.e HTC and lower cycle i.e LTC and Temperature difference in the cas

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17

KUMAR, RAHUL. "EXERGY AND ENERGY ANALYSIS OF THREE STAGE CASCADE REFRIGERATION SYSTEM FOR BIOMEDICAL APPLICATION USING NATURAL REFRIGRANTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14475.

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ABSTRACT Biomedical preservation requires the temperature for the storage of stem cell, blood, sperm & organs at a storage temperature of below -80°C.We can achieve effectively cooling of about -35°C with the help of simple vapour compression refrigeration system. With the help of compound vapour compression refrigeration system, temperature up to – 50 °C is achievable. The cascade refrigeration system is widely used where low temperatures are needed. The natural refrigerant CO2 makes it possible to achieve temperatures as low as -54°C in the low temperature stage. In this case propene is t

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KUMAR, RAHUL. "EXERGY & ENERGY ANALYSIS OF THREE STAGE CASCADE REFRIGERATION SYSTEM FOR BIOMEDICAL APPLICATION USING NATURAL REFRIGERANTS." Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14204.

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Biomedical preservation requires the temperature for the storage of stem cell, blood, sperm & organs at a storage temperature of below -80°C.We can achieve effectively cooling of about -35°C with the help of simple vapour compression refrigeration system. With the help of compound vapour compression refrigeration system, temperature up to – 50 °C is achievable. The cascade refrigeration system is widely used where low temperatures are needed. The natural refrigerant CO2 makes it possible to achieve temperatures as low as -54°C in the low temperature stage. In this case propene is the refrige

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19

Yang, Kai-Chiuan, and 楊凱全. "Design of Fuzzy Temperature Controller with Cascade Refrigerator System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/71541170759503129601.

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碩士<br>中原大學<br>機械工程研究所<br>97<br>In general, the refrigeration system controls the temperature by turning on or turning off the fixed-frequency compressor, or installing the heating device, but these methods waste too much electricity. The main method of controlling low temperature is using compressor system. Compressor system has a high energy efficiency and large refrigeration capacity in the general environment. However, when the evaporation temperature is lower, the efficiency of refrigeration device will decrease significantly. Therefore, we try to work this compressor system with other dev

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20

Liu, Po-Wen, and 劉博文. "Thermodynamic Analysis of Optimum Condensing Temperature of Cascade-Condenser for CO2/NH3 Cascade Refrigeration Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/726c3g.

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碩士<br>國立臺北科技大學<br>冷凍空調工程系所<br>93<br>For the low-temperature applications, such as quick freezing and frozen storage of food, the required evaporating temperature of refrigeration system ranges from -40°C to -55°C, in which a single-stage vapor-compression refrigeration system is inadequate. Considering global environmental protection, the use of natural refrigerants in refrigeration systems has been revealed to be a complete solution to permanent alternative for fluorocarbon-based refrigerants. A cascade refrigeration system applying the natural refrigerants CO2 and NH3 fulfills these require

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21

Gupta, Ankush 1986. "Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System." Thesis, 2012. http://hdl.handle.net/1969.1/148111.

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The survey from US Department of Energy showed that about one-third of energy consumption in US is due to air conditioning and refrigeration systems. This significant usage of electricity in the HVAC industry has prompted researchers to develop dynamic models for the HVAC components, which leads to implementation of better control and optimization techniques. In this research, efforts are made to model a multi-evaporator system. A novel dynamic modeling technique is proposed based on moving boundary method, which can be generalized for any number of evaporators in a vapor compression cycle. Th

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22

Wang, Pei-Yi, and 王姵懿. "Study on Low-Temperature Auto-Cascade Refrigeration Systems Operating with Zeotropic HC Refrigerant Mixtures." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/7p3xg7.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>99<br>The temperature of the freezer ranging from -40 to -160℃ is widely used in cryomedicine, energy, biotechnology as cryopreservation. The system used to zeotropic refrigerant mixtures and single compressor, through zeotropic refrigerant mixture in the high boiling point and low boiling point in order to achieve the natural separation between the multi-level series with the stack method, to take the system from -40 to -160℃ temperature purposes. The feature of the auto-cascade refrigeration systems is affected by zeotropic refrigerant mixtures therefore th

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23

Tang, Hsin-Chuan, and 唐欣傳. "Study on Low-Temperature Auto-Cascade Refrigeration Systems with Regenerator and Zeotropic Refrigerant Mixtures." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/tb5w4p.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>100<br>With the development of technology, the requirement for cryogenic freezing is getting stricter in the scope of energy, military, bio-tech, and medical. Especially in medical, the cell preservation technique is the key of graft. Auto-cascade system uses zeotropic mixture as refrigerant to implement the natural separation and multi-stage cascade through the temperature glide for getting low temperature of -60°C to -160°C. The performance of Auto-cascade system is mainly affected by the zeotropic refrigerant, so the key point is to select the composition

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