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Dissertations / Theses on the topic 'Miniature vapor compression cycle'

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1

Miller, Eric S. "Dynamic Modeling of Vapor Compression Cycle Systems." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337715881.

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2

Roberti, Giovanni. "Steady-state Modelling of a Vapor Compression Refrigeration Cycle." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19438/.

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In this work a steady-state model of a simple vapor compression refrigeration cycle is presented. All the fundamental components of this system are modeled separately in order to consider them as black boxes that take inputs and convert them into output variables. The heat exchangers are treated as a set of multiple zones, identified by the refrigerant's state, connected in series, in which the heat transfer coefficient (HTC) is constant. A non-linear system of equations is obtained applying the energy balances and the ε-NTU method for each zone in the heat exchangers. A study on the HTC corre
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3

Yildiz, Seyfettin. "Design And Simulation Of A Vapor Compression Refrigeration Cycle For A Micro Refrigerator." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612133/index.pdf.

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Cooling of electronic equipments has become an important issue as the advances in technology enabled the fabrication of very small devices. The main challenge in cooling is the space limitation. The use of miniature refrigerators seems to be a solution alternative for the cooling problem. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a micro-scale refrigerator. A MATLAB code is developed for the simulations. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. T
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4

Schoenfeld, Jonathan Michael. "Integration of a thermoelectric subcooler into a carbon dioxide transcritical vapor compression cycle refrigeration system." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8726.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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5

Caglar, Ahmet. "Theoretical And Experimental Performance Analysis Of A Solar Assisted Heat Pump." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607898/index.pdf.

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In this thesis, performance of a heat pump aided by solar heating system with an evacuated tubular collector has been analyzed theoretically and experimentally. For this purpose, a domestic hot water heating system has been designed, constructed and tested. The evacuated tubular solar collector has been used to achieve higher collector efficiency in winter. The fraction of the solar energy utilized has been measured experimentally and estimated theoretically. Effects of various parameters have been investigated on the performance of the proposed system. A mathematical model was developed to
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6

Довгопол, М. В. "Дослідження і розрахунок аміачного поршневого компресора, що працює у складі одноступеневої холодильної машини". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82900.

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У роботі виконано розрахунок холодильного циклу та компресора, а також визначено вплив температур гарячого і холодного джерела оберненого циклу одноступеневої парокомпресійної холодильної машини на коефіцієнт перетворення циклу, а також на витратні і енергетичні характеристики компресора, що працює у його складі. У розділі охорони праці розглянуто шкідливі та небезпечні фактори, які виникають при експлуатації поршневих компресорів у холодильному виробництві<br>В работе выполнен расчет холодильного цикла и компрессора, а также определено влияние температур горячего и холодного источника обратно
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7

"Design and experimental study on miniature vapor compression refrigeration systems." 2012. http://library.cuhk.edu.hk/record=b5549443.

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近年來微型製冷系統有許多應用。例如,電子器件的冷却是研製更快速、更小型和更可靠的芯片的重要課題, 隨著電子芯片功耗的增加,散熱量不断增長,傳統的被動式散熱方法已經過時,新的主動式散熱方法成爲必須。又例如微型個人冷卻系統可用於救火等各種惡劣環境。与其它製冷方法相比,蒸氣壓縮製冷技術是最有潜力的方法。<br>本文闡述了两种微型蒸氣壓縮製冷系統的研製工作:一是電子冷却系统,一是個人热舒适系统。研究主要包括以下幾個方面:<br>1) 微型蒸氣壓縮製冷系統的熱力學分析。對系統在不同工作條件下(包括壓縮機效率、環境溫度等)的性能進行了分析。对換熱器的設計也作了详述。<br>2) 微型蒸氣壓縮製冷系統的熵分析。通過分析發現,壓縮機和系統漏熱造成的熵是產生系統不可逆性的主要因素,因此高效的壓縮機和降低系統漏熱是提高微型蒸氣壓縮製冷系統性能的關鍵所在。<br>3) 實驗系统的詳細介紹。一共做了两套微型蒸氣壓縮製冷系統,一为電子冷卻系統和一为個人冷卻系統。爲了縮小微型蒸氣壓縮製冷系統的尺寸,系統的元件必須小型化。系統的壓縮機是在市場上直接购買的,但是換熱器包括冷板蒸發器、管翅式蒸發器和微通道冷凝器都是特別設計和製造的。實驗裝置建成可以方便的改變工作條件,諸如壓縮機轉速、製冷劑充灌量、毛細管長度、換熱器面積等。<br>4) 對電子冷卻系統和個人冷卻系統分別進行了實驗。對於電子散熱系統來,當發熱管的功率為
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8

Li, Yi-Ting, and 李懿庭. "Investigation of Miniature Vapor Compression Refrigeration System for Electronic Cooling." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50203717919372546318.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>97<br>Vapor compression refrigeration system (VCRS) is a cooling system that has high COP and high cooling capacity. The research emphasizes on the characteristics of a miniature VCRS and how the experimental factors affect it. This research can be divided into two parts: steady state experiments and VCRS simulations. In steady state experiments, a VCRS has been designed and assembled. The whole system is about 6 kg weight, and the size of the system is about 160×350×150 mm3. Experimental investigations are conducted to analyze that how the orifice of the expans
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9

(11155080), Vatsal M. Shah. "Oil Management in Systems Running Vapor Compression Cycle." Thesis, 2021.

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<p>Most air conditioning and refrigeration systems that employ the vapor compression cycle rely on oil circulating with refrigerant to lubricate the bearings and other contact surfaces in the compressor. The lubricant acts as a sealant to reduce leakage losses during the compression process and it also helps to absorb some of the excess heat that is generated in the compression chamber. However, this oil circulation results in oil retention in various other components outside the compressor depending on the physical interaction between lubricant and refrigerant and their transport properties.
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10

Huang, Ciao-Jheng, and 黃喬正. "Feasibility Analysis of Application of Vapor Compression Cycle System in Electronic Cooling." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/6yup2m.

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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>99<br>This study analyzed the impact on the overall thermal performance in case of different ambient temperatures and the condensation problem. It first established a vapor compression cycle system, and found the optimal refrigerant filling quantity by the refrigerant filling quantity experiment. It then analyzed the impact of spray type evaporator and multi-channel evaporator on system performance in order to further discuss the system condensation caused by vaporization temperature in case of different compressor rotation speeds, condenser cooling fan speeds and
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11

(8072936), Jiacheng Ma. "Reduced Order Modeling for Vapor Compression Systems via Proper Orthogonal Decomposition." Thesis, 2019.

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<p>Dynamic modeling of Vapor Compression Cycles (VCC) is particularly important for designing and evaluating controls and fault detection and diagnosis (FDD) algorithms. As a result, transient modeling of VCCs has become an active area of research over the past two decades. Although a number of tools have been developed, the computational requirements for dynamic VCC simulations are still significant. A computationally efficient but accurate modeling approach is critically important to accelerate the design and assessment of control and FDD algorithms where a number of iterations with a variet
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12

Kuo, Chi-Huan, and 郭奇寰. "Analysis on Feasibility of Applying Vapor Compression Cycle of Dual-Evaporator to Electronic Cooling." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/332yj7.

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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>This research is mainly to discuss the impact of different CPU loads on the overall cooling effectiveness of vapor compression cycle of dual-evaporator in electronic cooling. In the experiment, firstly, a vapor compression cycle system of dual-evaporator is established, and then the applicable optimal coolant filling volume for the system through the coolant filling volume experiment can be found out; secondly, the impact of dual-evaporator with the same stable load on the system efficiency is analyzed and the cooling effectiveness of air volume of con
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13

Self, Stuart. "Enhancing geothermal heat pump systems with parametric performance analyses." Thesis, 2010. http://hdl.handle.net/10155/93.

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Parametric performance analyses and comparison of a basic geothermal heat pump, a heat pump cycle with motor cooling/refrigerant preheating, and a heat pump cycle utilizing an economizer with respect to first law is conducted through simulation. Changing compressor, pump, and motor efficiency, along with condenser pressure, evaporator pressure, degree of subcooling at the condenser exit and degree of superheating at the evaporator exit is investigated. Economizer arrangements yield the highest coefficient of performance and resilience to change in COP with variation in evaporator pressure, and
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14

Balasubramanian, Siddharth. "Supplemental heat rejection in ground source heat pumps for residential houses in Texas and other semi-arid regions." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4881.

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Ground source heat pumps (GSHP) are efficient alternatives to air source heat pumps to provide heating and cooling for conditioned buildings. GSHPs are widely deployed in the midwest and eastern regions of the United States but less so in Texas and the southwest regions whose climates are described as being semi-arid. In these semi-arid regions, building loads are typically cooling dominated so the unbalance in energy loads to the ground, coupled with less conductive soil, cause the ground temperature to increase over time if the ground loop is not properly sized. To address this ground heati
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15

Yih, James S. "The geometric characterization and thermal performance of a microchannel heat exchanger for diesel engine waste heat recovery." Thesis, 2011. http://hdl.handle.net/1957/26405.

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Rising energy demands and the continual push to find more energy efficient technologies have been the impetus for the investigation of waste heat recovery techniques. Diesel engine exhaust heat utilization has the potential to significantly reduce the consumption of fossil fuels and reduce the release of greenhouse gases, because diesel engines are ubiquitous in industry and transportation. The exhaust energy can used to provide refrigeration by implementing an organic Rankine cycle coupled with a vapor-compression cycle. A critical component in this system, and in any waste heat recovery syst
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