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Готові списки джерел за темами / District heating and cooling / Дисертації

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Дисертації з теми "District heating and cooling"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Markowicz, Catarina. "Analysis of Cooling Capability in Polish District Heating Substations." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173144.

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For a district heating company it is of importance to have an efficient and well performing system. A central part in the work to lower temperature levels in district heating networks is to acknowledge and improve cooling capability in substations. The aim of this thesis is to analyse substations in Polish district heating systems in order to identify reasons of poor cooling and to present suggestions of implementable measures. Furthermore, the economical saving potential from an improved cooling is evaluated. The analysis was carried out for two of the five Polish companies included in this r

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2

Yuwardi, Yuwardi. "Absorption cooling in district heating network: Temperature difference examination in hot water circuit." Thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125068.

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Absorption cooling system driven by district heating network is relized as a smart strategy in Sweden. During summer time when the heating demand is low, the excessive hot water can be directly sold to drive absorption chillers instead of decreasing its production. In addition, this is also one answer to satisfy the cooling demand in more environmentally way since currently only around 26% of cooling demand in Sweden is satisfied by district cooling, the rest is fulfilled by individual air conditioning. Realizing this potential, the purpose of this study is to examine the returning hot water t

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3

VILAFRANCA, MANGUÁN ANA. "Convesion of industrial compression cooling to absorption cooling in an integrated district heating and cooling system." Thesis, University of Gävle, University of Gävle, Department of Technology and Built Environment, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4145.

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<p>Astra Zeneca plant in Gärtuna has many compression cooling machines for comfort that consume about 11.7 GWh of electricity per year. Many of the cooling machines are old; due to the increase of production of the plant, cooling capacity was limited and new machines have been built. Now, the cooling capacity is over-sized. Söderenergi is the district heating plant that supplies heating to Astra Zeneca plant. Due to the strict environmental policy in the energy plant, last year, a bio-fuelled CHP plant was built. It is awarded with the electricity certificate system.</p><p>The study investigat

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4

Chou, Lu-chien. "Drag reducing cationic surfactant solutions for district heating and cooling systems /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487758178238587.

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5

Kamal, Majd. "Potential for low temperature district heating system : Integrating 4th generation district heating system with existing technology." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-35816.

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This project presents a feasibility study and an investigation of the potential for low temperature district heating system in Västerås. The investigation treats integrations possibilities for 4GDH (4th Generation District Heating) in Kungsängens area in Västerås, which is undergoing a large-scale building-up and construction. The study is conducted for the company Mälarenergi AB. The advantages of 4GDH technology are identified and analyzed, where energy effectiveness and economic benefits aspects were concluded. Problems with existing technology and higher cooling demand expectations drive

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6

Djuric, Ilic Danica. "With district heating toward a sustainable future : System studies of district heating and cooling that interact with power, transport and industrial sectors." Doctoral thesis, Linköpings universitet, Energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106899.

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The aim of this thesis is to identify measures which should be taken in DH systems (DHSs) in order to contribute to the development of the DHSs and other energy systems (especially transport, industrial and power sectors) toward sustainability. Four business strategies were analysed: delivering excess heat from biofuel production industry to DHSs, conversion of industrial processes to DH, integration of biofuel production in DHSs and integration of DHdriven absorption cooling technology in DHSs. Delivering excess heat from biofuel production industry to DHSs was analysed with a focus on the bi

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7

Polyzakis, Apostolos. "Technoeconomic evaluation of trigeneraton plant: Gas turbine performance, absorption cooling and district heating." Thesis, Cranfield University, 2006. http://hdl.handle.net/1826/1832.

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This PhD thesis is a demand led study taking into account changes in ambient conditions and power settings of a tri-generation power plant. Includes an evaluation tool for combined heat, cooling and power generation plant. The thesis is based on an overall technical-economic analysis of the tri-generation system, including: 1. Energy demand analysis and evaluation of actual tri-generation case studies. 2. Modelling of the prime mover (Gas Turbine, GT) 3. Modelling of the absorption cooling system, (LiBr/Water). 4. Economic analysis and evaluation of the entire tri-generation plant. Initially,

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8

Sung, Ka-leung, and 宋家樑. "Energy consumption strategy: an overview of district cooling and heating in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31255073.

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9

Sung, Ka-leung. "Energy consumption strategy : an overview of district cooling and heating in Hong Kong /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B2342509x.

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10

Polyzakis, Apostolos L. "Technoeconomic evaluation of tri-generation plant : gas turbine performance, absorption cooling and district heating." Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/1832.

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Анотація:

This PhD thesis is a demand led study taking into account changes in ambient conditions and power settings of a tri-generation power plant. Includes an evaluation tool for combined heat, cooling and power generation plant. The thesis is based on an overall technical-economic analysis of the tri-generation system, including: 1. Energy demand analysis and evaluation of actual tri-generation case studies. 2. Modelling of the prime mover (Gas Turbine, GT) 3. Modelling of the absorption cooling system, (LiBr/Water). 4. Economic analysis and evaluation of the entire tri-generation plant. Initially,

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11

Babus'Haq, Ramiz F. "Optimal heat transfer design for district-heating and cooling pipelines in air-filled cavities." Thesis, Cranfield University, 1986. http://hdl.handle.net/1826/4214.

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Анотація:

District-heating and/or cooling systems are gradually becoming popular all over the world for heating and/or cooling of large premises. Current conventional practice for the DHC underground distribution networks is to place the supply and the return pipelines side-by-side in air-filled trencRe's. However, t present investigation has shown that by optimising the location of the pipelines, the thermal insulation provided by the air around the pipes can be maximised. This is achieved by placing the hot pipeline above the cold one, the exact position depending upon the temperatures involved. For m

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12

Lind, Jessica, and Erik Rundgren. "Industrial Symbiosis in Heat Recovery Collaborations between Data Centers and District Heating and Cooling Companies." Thesis, KTH, Energiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211709.

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Tough competition from local heating and cooling solutions fuels the pursuit of new cost efficient heat sources for district energy companies. This master thesis explores the possibilities for a district heating and cooling company to integrate data centers for recovery of residual heat. Recovery of the residual heat from data centers into the aggregated heat demand of a district energy system can lead to less primary energy input for the two operations combined. The thesis is based on a single case study on Norrenergi, a district heating and cooling company in the Stockholm region, and nine s

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13

SAMUELSSON, ANDERS, and DANIEL STEUER. "Model predictive control in heating and cooling networks : A case study of an urban district in Stockholm." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299439.

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This work presents a model predictive control system for heating and cooling supply planning in an urban heating and cooling network. The control approach addresses the need for strategic operation of distributed production technologies and thermal energy storage in increasingly complex heating and cooling networks. Predictive optimization handles this complexity with an optimization strategy taking future demand, prices, and energy source availability into consideration. The model predictive control is integrated in a model built in a co-simulation approach. The co-simulation approach allows

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14

Strömqvist, Bodil. "Fjärrvärmedriven Absorptionskyla : En ekonomisk undersökning av olika spetslösningar." Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-42412.

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This independent degree project has been implemented on behalf of FVB Sverige AB in collaboration Sundsvall Energi AB with the initial purpose of mapping manufacturers of hot water driven absorption chillers. After that, several technical solutions are examined to manage the peak load of a theoretical object which cannot produce the cooling power required with only an absorptions chiller, due to limitations in the district heating supply. The market study has shown that the supply of absorption chillers with drive temperatures of 70–90˚C is limited to a few manufacturers. World Energy offers a

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15

Smith, Bryan C. "Flow birefringence, nuclear magnetic resonance and corrosion measurements on drag reducing cationic surfactant solutions for district heating and cooling systems /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780865409286.

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16

Galvany, Castillo Francisco Jose. "Metodología práctica para evaluar la viabilidad de redes de frio y calor urbanas integrando energía solar y biomasa en la España cálida." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/61306.

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[EN] For more than a decade, the urban heat networks (District Heating, DH) combined with the use of renewable energies have been consolidated as a leading tool for energy efficiency and reducing emissions of greenhouse gases. Among the various possibilities of generation in the North and Central Europe, with little or no annual demand for comfort cooling, since the 80s a large number of facilities, that use solar energy with large seasonal accumulators capable to store surplus heat captured in the period of increased solar availability and minimum demand (summer) and hold until the time of

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17

Bäcklund, Johannes. "Energieffektivisering av fjärrvärme- och fjärrkylanätet på campus i Umeå : Energy efficiency of the district heating and cooling systems on campus in Umeå." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148393.

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Detta examensarbete utfördes på uppdrag av Akademiska Hus som äger och förvaltar fastigheterna på campus i Umeå. Projektet bestod av att utifrån en övergripande bild på det interna fjärrvärme- och fjärrkylanätet på campus, ta fram alternativa utformningar på systemet i syfte om att göra det mer energieffektivt. Systemets interna fjärrvärme- och fjärrkylanät VP100 och KB100 växlar över värme och kyla från Umeå Energi som sedan distribueras vidare till fjärrvärme- och fjärrkylacentraler på campus. Några av centralerna har egenproduktion där returledningen från KB100 går till en värmepump som pro

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18

Oppelt, Thomas. "Modell zur Auslegung und Betriebsoptimierung von Nah- und Fernkältenetzen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-179211.

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Fernkälte bietet das Potenzial, wirtschaftlich und ökologisch vorteilhaft zur Deckung des stetig zunehmenden Klimakältebedarfs beizutragen. Im Rahmen dieser Arbeit wurde ein dynamisches thermohydraulisches Netzmodell „ISENA“ entwickelt, mit dem während der Planung und des Betriebs von Fernkältesystemen auftretende Fragen, beispielsweise in Bezug auf Wirtschaftlichkeit und Energieeffizienz, beantwortet werden können. Das Netzmodell setzt sich aus einem quasistationären hydraulischen Modell und einem instationären thermischen Modell zusammen, das auf der Verfolgung von Wasserpfropfen durch das g

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19

Udomsri, Seksan. "Combined Electricity Production and Thermally Driven Cooling from Municipal Solid Waste." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32117.

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Increasingly intensive efforts are being made to enhance energy systems via augmented introduction of renewable energy along with improved energy efficiency. Resource constraints and sustained high fossil fuel prices have created a new phenomenon in the world market. Enhanced energy security and renewable energy development are currently high on public agenda worldwide for achieving a high standard of welfare for future generations. Biomass and municipal solid waste (MSW) have widely been accepted as important locally-available renewable energy sources offering low carbon dioxide (CO2) emissio

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20

Put, Joris. "The European District Heating Database and Mapping European District Heating Systems." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15114.

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21

Song, Jingjing. "Restructured district heating price models and their impact on district heating users." Licentiate thesis, Mälardalens högskola, Framtidens energi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-34779.

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District heating (DH) is considered to be an efficient, environmentally friendly and cost-effective method for providing heat to buildings, since electricity is usually co-generated in biomass fuelled combined heat and power (CHP) plants. This gives it an important role in the mitigation of climate change. Swedish district heating companies are currently facing multiple challenges, and are in urgent need of new price models to increase transparency and maintain their competitiveness. This thesis describes a survey carried out to understand the structure of the present price models and subseque

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22

Netterberg, Hanna, and Isabel Isaksson. "District Heating in Slough." Thesis, Halmstad University, School of Business and Engineering (SET), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2638.

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<p>District heating through the Swedish model has proven to be an environmental and financially beneficial solution for heating. By reusing energy resources that normally would be wasted con-tributes district heating in an effective way to the society’s energy consumption. Today district heating stands for more than fifty percent of the heat supply to the Swedish residential and service sector buildings. The long tradition in the area has generated knowledge and experiences that to-day are applicable to other countries that are looking for more environmental conscious heating alternatives.</p>

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23

Johansson, Christian. "Towards Intelligent District Heating." Licentiate thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00467.

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Анотація:

A district heating system consists of one or more production units supplying energy in the form of heated water through a distribution pipe network to a multitude of consumers. District heating systems come in a range of different forms and sizes; from small independent systems within industrial estates or university campuses to large city-wide systems supplying millions of consumers with heating and hot water. The geographically dispersed layout of district heating systems suggest that they are suitable for distributed optimization and management. However, this would imply a transition from t

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24

Johansson, Christian. "On Intelligent District Heating." Doctoral thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00587.

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Intelligent district heating is the combination of traditional district heating engineering and modern information and communication technology. A district heating systemis a highly complex environment consisting of a large number of distributed entities, and this complexity and geographically dispersed layout suggest that they are suitable for distributed optimization and management. However, this would in practice imply a transition from the classical production-centric perspective normally found within district heating management to a more consumer-centric perspective. This thesis describes

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25

Martin, Guillaume. "District Heating Networks Design." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264257.

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District heating networks are a solution to decrease the amount of CO2 emission in the atmosphere and a mean to increase the share of renewable energy in the energy mix. This degree project, conducted at Engie Réseaux, investigates the best options to design them. The challenges and the constraints of their design will be developed and the tools created to achieve it will be presented. This thesis exposes the major climatologic, economic, and energetic parameters to take into account when designing a network and shows the methodology used in these three fields.<br>Fjärrvärmenät är en lösning f

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26

Soderlund, Matthew Roger. "Congeneration dedicated to heating and cooling." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17672.

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27

Lieyuan, Chen, and Liang Jing. "The district Heating in China." Thesis, University of Gävle, University of Gävle, Department of Technology and Built Environment, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4914.

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28

Dong, Bing. "Integrated Building Heating, Cooling and Ventilation Control." Research Showcase @ CMU, 2010. http://repository.cmu.edu/dissertations/4.

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Анотація:

Current research studies show that building heating, cooling and ventilation energy consumption account for nearly 40% of the total building energy use in the U.S. The potential for saving energy through building control systems varies from 5% to 20% based on recent market surveys. In addition, building control affects environmental performances such as thermal, visual, air quality, etc., and occupancy such as working productivity and comfort. Building control has been proven to be important both in design and operation stages. Building control design and operation need consistent and reliable

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29

Bol, Bullen A. D. "A pervaporation membrane absorption cooling heating system." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289081.

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30

Poulis, P. D. A. "Radiant wall and floor heating and cooling." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384588.

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31

Karlström, Petra. "Soft Heating and Cooling in Humid Climates." Thesis, KTH, Byggnadsteknik, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35098.

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32

Chekh, O. "Heat pumps technology of heating and cooling." Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/34922.

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Анотація:

Increasing concern to society ecological and environmental issues, the demand for more efficient ways of using heat and energy is growing. Heat pump industry uses year-round heating with thermal energy. This concept is done by providing localized or redirected heat, by the exchange of cold air with the heated air. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34922

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33

Tonhammar, Anders. "Solar District Heating : The potential of a large scale solar district heating facility in Stockholm." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-219248.

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As a part of Fortum's vision of a future Solar Economy, a feasibility study of a Solar District Heating facility was conducted. The focus of this study was to determine the technical, economic and environmental potential of a Solar District Heating facility, combined with a seasonal thermal storage, in the district heating network in Stockholm. Three different cases have been studied. The cases differ on the size of the available land area, on what type of storage technology utilized and if excess heat from different production facilities in the network is included or not. The results indicat

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34

Lindgren, Nicolas, and Karl Brogren. "Production optimization for district heating : Short-term planning of district heating grid in Gävle, Sweden." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44268.

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Анотація:

Energy systems with a high portion of renewable energy from wind and solar power can suffer from fluctuations in production due to weak winds or cloudy weather, which may affect the electricity price. When producing heat and power in a combined heat and power plant, an additional heat storage tank can be used to store the heat surplus which is obtained when the power production is high, and the heat demand is low. To optimize heat and power production economically, short-term planning can be applied. Short-term planning covers the production in the near future of 1-3 days. The optimization in

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35

Fredriksson, Victor, and Bane Gluhajic. "Heating systems in small houses : A comparison between geothermal heating and district heating." Thesis, KTH, Byggteknik och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253799.

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Анотація:

District heating and geothermal heating are in present times two established heating systems that are often compared against each other. The purpose of this work is to describe which factors influence the choice of heating system during the planning stage and what the costs are for each system. In this paper, a typical house model has been developed and used as a basis for the comparison of both systems. The comparison has been made in the form of energy calculations in the energy calculation program BV2, where heat requirements and regulatory requirements for energy performance have been comp

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36

Chan, Hoy-Yen. "Solar facades for heating and cooling in buildings." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12319/.

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Анотація:

The aim of this thesis is to study the energy performance of a building integrated heating and cooling system. The research objectives are to investigate the system operating characters, to develop mathematical models for the heating and cooling systems, to demonstrate the technologies experimentally, to identify the best designs for a combined system and to investigate the cost effectiveness of the system. The main components of the systems are the aluminium plate façade and the building wall behind it, these form a plenum between them and the air is then heated or cooled as it flows through

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37

Kunz, Jakob. "Dynamic behavior of district heating systems /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1234.

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38

Lindgren, Jonas. "Numerical modelling of district heating networks." Thesis, Umeå universitet, Institutionen för fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-143896.

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Анотація:

District heating is today, in Sweden, the most common method used for heating buildings in cities. More than half of all the buildings, both commercial and residential, are heated using district heating. The load on the district heating networks are affected by, among other things, the time of the day and different external conditions, such as temperature differences. One has to be able to simulate the heat and pressure losses in the network in order to deliver the amount of heat demanded by the customers. Expansions of district heating networks and disrupted pipes also demand good simulations

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39

Yliniemi, Kimmo. "Fault detection in district heating substations /." Luleå : Luleå tekniska universitet, 2005. http://epubl.ltu.se/1402-1757/2005/60/.

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40

Neale, Antony John. "Heat transfers from district heating pipes." Thesis, Cranfield University, 1987. http://dspace.lib.cranfield.ac.uk/handle/1826/4546.

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Experimental and numerical investigations were carried out on air-filled cavities containing heated inner cylinders. The effect of varying the position of radial spacers on a single cylinder was studied. It was concluded that for central positioning of the cylinder within the cavity. the rate of heat-transfer was minimised at a radial spacer angle of 480 (measured from the vertically downwards radius vector). When the cylinder was positioned at displacement ratio of 0.7, the rate of heat-transfer was minimised at a corresponding spacer angle of 520. The corresponding reductions in the total ra

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Sultan, Sahira. "Cost Evaluation of Building Space Heating; District Heating and Heat Pumps." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-37137.

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Climate change and energy efficiency has become a matter of concern in recent times; therefore, energy efficiency of buildings has drawn major attention. According to the European Commission, EU countries must improve energy efficiency of existing buildings by retrofitting and renovating the buildings. A case study of a renovated commercial building is considered in this degree project. A model of the building is developed in the IDA Indoor Climate and Energy (IDA ICE) software. The model is then augmented to include renovations in the building. Further, the model is simulated in IDA ICE befor

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Alharbi, Abdulrahman. "Investigation of sub-wet bulb temperature evaporative cooling system for cooling in buildings." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27806/.

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The work presented in this thesis investigates design, computer modelling and testing a sub-wet bulb temperature evaporative cooling system for space air conditioning in buildings. The context of this evaporative cooling technology design is specifically targeted at locations with a hot and dry climate such as that prevailing in most regions of Middle East countries. The focus of this technology is to address the ever-escalating energy consumption in buildings for space cooling using mechanical vapour compression air conditioning systems. In this work, two evaporative cooling configurations bo

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Amara, Sofiane. "Novel and ancient technologies for heating and cooling buildings." Doctoral thesis, Luleå tekniska universitet, Arkitektur och vatten, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16977.

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The basic issue of this thesis concerns one of the fundamental problems of the future of our society: How to meet the energy requirements for a large and growing world population while preserving our environment? This question is important for the world and the answers are complex and interwoven.Conventional energy sources, fossil and fissile, are polluting in the present and in the future: they erode the environment and their resources are limited. Renewable energy (hydro, wind, solar, geothermal) constitutes a minimum of pollution in the different energy systems. The technologies for using r

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Afroz, Zakia. "Performance improvement of building heating, cooling and ventilation systems." Thesis, Afroz, Zakia (2019) Performance improvement of building heating, cooling and ventilation systems. PhD thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/54931/.

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Heating, Ventilation, and Air Conditioning (HVAC) systems are responsible for a substantial share of the energy consumed in commercial buildings. Energy used by HVAC systems has increased over the years due to its broader application in response to the growing demand for better thermal comfort within the built environment. While existing case studies demonstrate the energy saving potential of efficient HVAC operation, there is a lack of studies quantifying energy savings from optimal operation of HVAC systems when considering indoor environmental conditions. This research aims to improve the p

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Saman, Namir Fathullah. "Analysis of building heating and cooling requirements after shutdown." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184867.

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The heating and cooling requirements after a shutdown period of the heating ventilating and air conditioning (HVAC) systems in buildings are studied through an analytical model. The parameters affecting the preconditioning and storage loads which are of particular importance are identified. A mathematical computer model is developed to facilitate the analysis of the shutdown loads. Zones are grouped in terms of heavy, medium and light weight construction for the study. For a specified zone, the ratio of the inside surface area to the outside exposed area, A(s)/A(w), is an important parameter i

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Serra, Ramon Lourdes, and Asenjo Alba Montañes. "District heating to replace an electrical installation." Thesis, University of Gävle, University of Gävle, Department of Technology and Built Environment, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4851.

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<p>This project has been developed at the company Gavlegardarna. The companyowns a large part of the buildings of Gävle and two of them are the objective ofthe project. Gavlegardana is highly concerned about the environment; for thisreason, they cooperate on the subject with the energy management from theirtechnical department.</p><p>Gävle is one of the Swedish cities where the DH (district heating) network isdistributed, arriving to most of the dwellings, industries and commercialbuildings. As DH uses environmentally friendly sources of energy,Gavlegardana is introducing it in its buildings.<

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Wernstedt, Fredrik. "Multi-Agent Systems for District Heating Management." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00258.

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This thesis investigates the applicability of multi-agent systems as a control approach for district heating systems. The consumers, i.e., the heat exchange systems, in current district heating systems are purely reactive devices and have typically no communication capabilities. They are only able to make local decisions without taking into account the global situation in the system. In this work, the possibilities of a new type of heat exchanger systems that has an open software environment and communication capabilities are explored. Operators of district heating systems have several, often

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Thorsteinsson, Hildigunnur H. "U.S. geothermal district heating : barriers and enablers." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/42932.

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Thesis (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 122-128).<br>Geothermal district heating experience in the U.S. is reviewed and evaluated to explore the potential impact of utilizing this frequently undervalued renewable energy resource for space and hot water heating. Although the first U.S. geothermal district heating system (GDHS

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Idowu, Samuel O. "Applied Machine Learning in District Heating System." Licentiate thesis, Luleå tekniska universitet, Datavetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68486.

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In an increasingly applied domain of pervasive computing, sensing devices are being deployed progressively for data acquisition from various systems through the use of technologies such as wireless sensor networks. Data obtained from such systems are used analytically to advance or improve system performance or efficiency. The possibility to acquire an enormous amount of data from any target system has made machine learning a useful approach for several large-scale analytical solutions. Machine learning has proved viable in the area of the energy sector, where the global demand for energy and

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Filatov, Artem. "Concentrating Collector for Torsång District Heating System." Thesis, Högskolan Dalarna, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:du-28539.

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In this thesis report for Dalarna University in Borlange and Absolicon company the study of a possibility to add an array of concentrating solar collectors to a Torsång district heating system was done. The whole idea of this work was to make a simulation of this kind of system, trying to get 15-20% of solar fraction, and make an economical evaluation. At the same time, another goal was to make two comparisons: between concentrating and flat-plate collector in the same system, and between two tools for collector analysis – Polysun and Absolicon tool, based on TRNSYS, which was designed to esti

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