International Journal of Air-conditioning and Refrigeration最新文献_第9页

Pool Boiling of Ammonia, Assessment of Correlations 氨池沸腾，相关性评估

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-31 DOI: 10.1142/S2010132521500127

T. Baki

引用次数: 0

Experimental Study of Domestic Refrigerator Performance Improvement with Evaporative Condenser 蒸发式冷凝器改善家用冰箱性能的实验研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-31 DOI: 10.1142/S2010132521500152

Kawal Preet Singh Khalsa, S. Sadhu

{"title":"Experimental Study of Domestic Refrigerator Performance Improvement with Evaporative Condenser","authors":"Kawal Preet Singh Khalsa, S. Sadhu","doi":"10.1142/S2010132521500152","DOIUrl":"https://doi.org/10.1142/S2010132521500152","url":null,"abstract":"Evaporation of defrosted water in household refrigerators and condenser waste heat utilization has been reported by many researchers but limited literature is available on the study of evaporative cooling in domestic refrigerators (condenser waste heat utilization for defrost water evaporation) with helical coil heat exchangers. This paper is concerned with evaluating domestic refrigerator performance by employing an evaporative helical coil heat exchanger before hot wall condenser which is utilized for evaporation of defrost water and reducing the superheated refrigerant temperature to condensing temperature to reduce the condenser load and improve the overall performance of a domestic refrigerator. Results show that evaporative cooling increases COP of the system by 25.3%, reduces the energy consumption of the refrigerator by 7.3% and the compressor run time by 10.6%. These experimental results also revealed that using two different thermal conductivity tube materials for evaporative helical coil condenser (Copper tube and Zinc coated steel tube) provided with less wall thickness (0.2[Formula: see text]mm) PVC coating results in good agreement for the same evaporation rate of defrosted water.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85097776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Experimental Investigation of the Effects of Non-Uniform Clothing Ensembles on the Occupants’ Thermal Perceptions under a Local Ventilation System 局部通风系统下非均匀着装对乘员热感知影响的实验研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-26 DOI: 10.1142/S2010132521500115

P. E. Naghani, S. A. Zolfaghari, M. Maerefat, J. Toftum, S. M. Hooshmand

{"title":"Experimental Investigation of the Effects of Non-Uniform Clothing Ensembles on the Occupants’ Thermal Perceptions under a Local Ventilation System","authors":"P. E. Naghani, S. A. Zolfaghari, M. Maerefat, J. Toftum, S. M. Hooshmand","doi":"10.1142/S2010132521500115","DOIUrl":"https://doi.org/10.1142/S2010132521500115","url":null,"abstract":"This paper presents an experimental study that evaluated the effects of three different non-uniform types of clothing ensembles (Type A: short-sleeve shirt, T-shirt underwear, men’s briefs, straight trousers, socks, shoes; Type B: long-sleeve shirt, T-shirt underwear, men’s briefs, straight trousers; and Type C: long-sleeve shirt, men’s briefs, straight trousers, thick socks, shoes) with almost the same thermal insulation (about 0.52 clo) on the subjects’ local and overall thermal sensation and air movement preference under a desktop local ventilation system. The experiment was conducted in a test chamber with the mean air temperature of [Formula: see text]C and under three supply air temperatures of [Formula: see text]C, [Formula: see text]C, and [Formula: see text]C from a desktop ventilation system. The results revealed that the body segments with the most critical thermal sensation were (i) forearms, hands and arms for the subjects with “A type” clothing ensemble, (ii) feet, hands and forearms for the subjects with “B type” clothing ensemble, and (iii) hands, arms, forearms and chest for the subjects that wore “C type” clothing ensemble. For the three clothing types of “A”, “B” and “C”, the values of overall thermal sensation changed from [Formula: see text]0.63, [Formula: see text]1.25, and [Formula: see text]1.13 at [Formula: see text]C to [Formula: see text]0.31, [Formula: see text]0.31, and [Formula: see text]0.38 at [Formula: see text]C inlet temperature, respectively. Also, the results indicated that upon elevation of the inlet air temperature from [Formula: see text]C to [Formula: see text]C, the percentages of the subjects who preferred less air movement dropped from 63%, 63%, and 50% to 38%, 25%, and 38%, respectively, for wearing “A”, “B” and “C” clothing ensembles.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84887913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study on the Evaluation of Sealing Performance of Horizontal Blowing Air Curtain Installed in Doorways 门道卧式吹风幕密封性能评价研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-10 DOI: 10.1142/S2010132521500103

Yong-Il Kwon

{"title":"Study on the Evaluation of Sealing Performance of Horizontal Blowing Air Curtain Installed in Doorways","authors":"Yong-Il Kwon","doi":"10.1142/S2010132521500103","DOIUrl":"https://doi.org/10.1142/S2010132521500103","url":null,"abstract":"Air curtains are installed to reduce heat loss due to drafts intruding into the indoor through the open doorways, and play the role of separating two climatic zones and different environmental zones. It is also used to protect the workplace from impurities or to reduce the spread of cigarette smoke in restaurants. Recently, aircraft to provide the individual air barrier by the vertical blowing air curtains have installed a physical barrier in the breathing zone between adjacent seats to protect passengers from COVID-19. The main factors affecting the sealing performance (SP) of the air curtain are the difference of temperature and pressure between indoor and outdoor, and are used to make the proper jet flow an air barrier with the high airtightness. Until now, various types of air curtains are manufactured and sold. Air curtains with the improved SP do not only have a discharge port but also a suction port. This study was conducted to evaluate the SP of the horizontal blowing air curtain according to the discharge pressure, and to select the minimized volume flow rate required for creating the proper zone separation. The volume flow rate of outdoor air intruding into the indoor through the doorways is used to evaluate the SP of the air curtain, and is calculated using the SVE4 proposed by Murakami in this study.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73923162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Increasing the Cooling Rate of the Vapor Compression Cycle by Heating 通过加热提高蒸汽压缩循环的冷却速率

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-01 DOI: 10.1142/S2010132521500097

M. Abd-Elhady, E. Bishara, M. A. Halim

{"title":"Increasing the Cooling Rate of the Vapor Compression Cycle by Heating","authors":"M. Abd-Elhady, E. Bishara, M. A. Halim","doi":"10.1142/S2010132521500097","DOIUrl":"https://doi.org/10.1142/S2010132521500097","url":null,"abstract":"Refrigeration and air conditioning cycles consume a large amount of electrical energy and the shortage in traditional sources of energy is the main reasons for governments to use renewable energy. The most power consuming part in the Vapor Compression Cycle (VCC) is the gas compressor. Therefore, the objective of this research is to increase the cooling rate of the VCC using the same compressor, and that is done by heating the refrigerant coming out from the compressor. The proposed cycle is similar to the VCC except that the compression processes is done in two stages, the first stage via a gas compressor and in the second stage by heating the refrigerant under constant volume. The heating process can be done using solar energy. An experimental setup has been developed to study the influence of heating the refrigerant on the cooling rate of the VCC. The heating process is performed after the compressor, and it is done under constant volume in order to increase the pressure of the refrigerant. Four experiments have been performed; the first experiment is a normal VCC, i.e., without heating, while in the second, third and fourth experiments, the refrigerant has been heated to 50∘C, 100∘C and 150∘C, respectively. It has been found that the cooling power increases with the heating temperature. Heating increases the pressure of the refrigerant in VCC, and consequently increases the mass flow rate of the refrigerant that results in an increase in the refrigeration power for the same compressor power. However, the disadvantage of heating the refrigerant is that it increases the evaporator temperature, which limits the possibility of the VCC to be used in freezing applications.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74191628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Study on the Combined Driven Refrigeration Cycle Using Ejector 喷射器联合驱动制冷循环的研究

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-01 DOI: 10.1142/S2010132521500048

W. Raza, Gwang-Soo Ko, Youn Cheol Park

{"title":"A Study on the Combined Driven Refrigeration Cycle Using Ejector","authors":"W. Raza, Gwang-Soo Ko, Youn Cheol Park","doi":"10.1142/S2010132521500048","DOIUrl":"https://doi.org/10.1142/S2010132521500048","url":null,"abstract":"The rising need for thermal comfort has resulted in a rapid increase in refrigeration systems’ usage and, subsequently, the need for electricity for air-conditioning systems. The ejector system can be driven by a free or affordable low-temperature heat source such as waste heat as the primary source of energy instead of electricity. Heat-driven ejector refrigeration systems become a promising solution for reducing energy consumption to conventional compressor-based refrigeration technologies. An air-conditioning system that uses the ejector achieves better performance in terms of energy-saving. This paper presents a study on the combined driven refrigeration cycle based on ejectors to maximize cycle performance. The experimental setup is designed to determine the coefficient of performance (COP) with ejector nozzle sizes 1.8, 3.6, and 5.4[Formula: see text]mm, respectively. In this system, the R-134a refrigerant is considered as a working fluid. The results depict that the efficiency is higher than that of the conventional refrigeration method due to comparing the performance of the conventional refrigeration cycle and the combined driven refrigeration cycle. The modified cycle efficiency is better than the vapor compression cycle below 0∘C, which implies sustainability at low temperatures by using low-grade thermal energy. For the improvement of mechanical efficiency, proposed cycle can be easily used.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81953082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Exergetic Model for the Ambient Air Temperature Impacts on the Combined Power Plants and its Management Using the Genetic Algorithm 基于遗传算法的环境气温对联合电厂影响的火用模型及其管理

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-03-01 DOI: 10.1142/S2010132521500085

Hossein Khajehpour, N. Norouzi, M. Fani

{"title":"An Exergetic Model for the Ambient Air Temperature Impacts on the Combined Power Plants and its Management Using the Genetic Algorithm","authors":"Hossein Khajehpour, N. Norouzi, M. Fani","doi":"10.1142/S2010132521500085","DOIUrl":"https://doi.org/10.1142/S2010132521500085","url":null,"abstract":"4E analysis is used on a Brayton–Rankine combined cycle power plant (CCPP) with a dual pressure heat recovery steam generation (HRSG) system. A multi-objective genetic-based evolutionary optimization has been used to estimate the most optimal exergy efficiency status, exergy cost reduction, carbon emission reduction, and NOx emission reduction. For the validation of the data, the simulation results are compared with the plant’s data. This study investigates the effect of every decisive parameter on the objective performance parameters of the CCPP. The primary estimated results are the emission rates, efficiencies, and the exergoeconomic cost of the system. At the optimum operational state, the exergy efficiency may increase by 10%, while the total emissions may decrease by 14.6%. The conventional technical measures’ effectiveness to improve the combined cycle power plant’s energy performance is applied to the simulated case study. Results have shown that the main source of the exergy destruction in this system is the HRSG and the combustion chamber, and also the overall performance of the plant shows great sensitivity to the ambient air temperature. This fact has shown that climate change and global warming are effective in thermal power plants’ performance. Therefore, the effect of the climate change on the ambient air temperature impact on the power plant and the 4E performance of the simulated combined cycle power plant is also studied. The results show that, due to the global warming effect, the exergy efficiency of the CCPP unit is decreased by over 0.2% in the last two decades, which can be generalized to all thermal electricity generation units throughout the world based on the mean global temperature rise in the last decades.","PeriodicalId":13757,"journal":{"name":"International Journal of Air-conditioning and Refrigeration","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89722459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Performance Enhancement in LiCl–H2O and LiBr–H2O Absorption Cooling Systems Through an Advanced Exergy Analysis 通过先进的火用分析提高LiCl-H2O和lib - h2o吸收式冷却系统的性能

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-02-20 DOI: 10.1142/S2010132521500073

Parth Mody, J. Patel, Nishant Modi, Bhargav Pandya

引用次数: 1

Modified Chilled Coil Model Development and Application to Turbine Inlet Air Cooling 改进冷却盘管模型的开发及其在汽轮机进气冷却中的应用

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-02-10 DOI: 10.1142/S2010132521500061

G. Anand, E. Makar

引用次数: 1

Exergy Analysis and Optimization of Natural Gas Liquids Recovery Unit 天然气液回收装置的火用分析与优化

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International Journal of Air-conditioning and Refrigeration Pub Date : 2021-02-01 DOI: 10.1142/s201013252150005x

Hossein Khajehpour, N. Norouzi, N. Shiva, Reza Mahmoodi Folourdi, Ehsan Hashemi Bahremani

引用次数: 5