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Experimental investigation of evaporative cooling systems for agricultural storage and livestock air-conditioning in Pakistan

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Building Simulation 2021年第3期14卷 617-631页

作者： Hafiz M.U.Raza Muhammad Sultan Majid Bahrami Alamgir A.Khan Department of Agricultural Engineering Bahauddin Zakariya UniversityBosan RoadMultan 60800Pakistan Laboratory for Alternative Energy Conversion(LAEC) School of Mechatronic Systems EngineeringSimon Fraser UniversitySurreyBCCanada Department of Agricultural Engineering Muhammad Nawaz Shareef University ofAgricultureMultan 60000Pakistan

Evaporative cooling(EC)is an ancient technique that is usually suitable for hot and dry climatic conditions due to the potential of water vapor *** this study,three kinds of evaporative cooling systems such as direct EC(DEC),indirect EC(IEC),and Maisotsenko cycle EC(MEC)were locally developed at *** performance of the systems was evaluated and compared for agricultural storage and livestock air-conditioning application in *** experiments were performed for climatic conditions of Multan city(Pakistan)and the data were collected for hourly and daily *** to the results,it was observed that the DEC system has the ability to reduce the temperature of ambient air to an average of 8.5℃.Whilst IEC and MEC systems were able to drop the temperature of ambient air to an average of 6.8℃and 8.9℃,*** per the results,the DEC system remained behind to provide desired conditions for livestock and agricultural product storage applications due to excessive *** the other hand,the IEC and MEC systems can achieve the desired conditions for livestock application,but could not provide feasible conditions for various fruits and vegetable *** study concludes that hybrid EC systems can be developed to provide desired conditions for a wide range of applications under varying climatic conditions.

关键词： evaporative cooling air-conditioning dew-point wet-bulb storage livestock

Entropy Assessment on Environmental Influence of Condense Heat in Recovery System in air-conditioning Refrigerating Machine

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湖南大学学报（自然科学版） 2009年第S1期36卷 96-101页

作者： TANG Wen-wu1,2,WANG Han-qing1,2(1.School of Energy Science and Engineering,Central South University,Changsha,Hunan 410083,China 2.School of Civil Engineering,Hunan University of Technology,Zhuzhou,Hunan 412008,China) School of Energy Science and Engineering Central South University Changsha 410083 China School of Civil Engineering Hunan University of Technology Zhuzhou 412008 China

This paper presented an entropy evaluation method for the influences of condense heat recovery system on the *** at the damage of the condense heat to the environment,an entropy of resource loss and an emission entropy from the condense heat recovery system in the air conditioning refrigerating machine were *** the evaluation of the entropies,we developed a new algorithm for the parameter identification,called the composite influence coefficient,based on the Least Squares Support Vector Machine *** simulation,the numerical experiments shows that the Least Squares Support Vector Machine method is one of the powerful methods for the parameter identification to compute the damage entropy of the condense heat,with the largest training error being-0.025(the relative error being-3.56%),and the biggest test error being 0.015(the relative error being 2.5%).

关键词： air-conditioning refrigerating machine condense heat entropy evaluation LS-SVM

Selection of Weather Parameters for air-conditioning System Design for Buildings with Long Thermal Lag

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湖南大学学报（自然科学版） 2009年第S1期36卷 79-82页

作者： GE Lian-feng1,2,LEI Ming3,CHEN You-ming1,2(1.College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China 2.Key Laboratory of Building Safety and Energy Efficiency,MOE,China (3.Aviation Theory Department,Aviation University of air Force,Changchun,Jilin 130022,China) College of Civil Engineering Hunan University Changsha 410082 China Key Laboratory of Building Safety and Energy Efficiency China Aviation Theory Department Aviation University of Air Force Changchun 130022 China

Two building factors-a longer thermal lag of more than one hour for building envelops and a lag of indoor radiation to convert into cooling load-have impact on the instantaneous heat input and instantaneous cooling *** the two factors should be taken into account when selecting the weather parameters for air-conditioning system *** paper developed a new statistic method for the rational selection of coincident solar irradiance,dry-bulb and wet-bulb *** method was applied to historic weather records of 25 years in Hong Kong to generate coincident design weather *** the results show that traditional design solar irradiance,dry-bulb and wet-bulb temperatures may be significantly overestimated in many conditions,and the design weather data for the three different constructions is not kept constant.

关键词： building construction thermal lag system capacity design weather data air-conditioning

State space reconstruction of classic methods in air-conditioning dynamic load calculation

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Chinese Science Bulletin 1996年第21期41卷 1843-1846页

作者：丁国良张春路陈芝久 Refrigeration Technique Research Institute Shanghai Jiaotong University Shanghai 200030 China

In actual air-conditioning systems,accurate calculation of dynamic loads is demandedfor the energy and materials saving and comfort *** about the beginning of the1970s,researchers abroad developed the harmonic wave method(HWM),thermal responsefactor method(TRFM)and Z-transfer function method(ZTFM),and made greatachievements on the transition of air-conditioning loads calculation from steady methods

关键词： air-conditioning dynamic load state space harmonic wave method thermal response factor Z-transfer function.

Application of Dual Throttling air-conditioning System to Explosion-Proof Frequency Converter

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Transactions of Tianjin University 2015年第2期21卷 95-103页

作者：张于峰高岩盛颖 School of Environmental Science and Engineering Tianjin University Collaborative Innovation Center of Chemical Science and Engineering

An explosion-proof dual throttling air-conditioning system was put forward to solve the heat dissipation and internal dewing problems of explosion-proof frequency converter in the underground coal mine. This study investigated the feasibility and benefits of explosion-proof dual throttling cooling and dehumidification air-conditioning system applied to the explosion-proof frequency converter. The physical model of dual throttling air-conditioning system was established and its performance parameter was described by mathematical method. The design calculation of the system has also been done. The experimental result showed that the system reached the steady state at the refrigeration mode after running 45 min, and the maximum internal temperature of the flame-proof cavity was 31.0 ℃. The system reached the steady state at the dehumidification mode after running 37 min. The maximum internal relative humidity and temperature of the flame-proof cavity were 33.4% and 36.3 ℃, respectively. Therefore, the proposed system had excellent ability of heat dissipation and avoided internal dewing. Compared with water cooling system, it was more energy-saving and economical. The airflow field of dual throttling air-conditioning system was also studied by CFD simulation. It was found that the result of CFD numerical simulation was highly consistent with the experimental data.

关键词： explosion-proof converter dual throttling air-conditioning CFD energy saving heat dissipation dewing

Impact of summer office set air-conditioning temperature on energy consumption and thermal comfort

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Journal of Central South University 2009年第S1期16卷 6-11页

作者：刘红马小磊高亚峰 Key Laboratory of Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University Faculty of Urban Construction and Environmental Engineering Chongqing University

To explore the relationship between summer office set air-conditioning temperature and energy consumption related to air conditioning use to provide human thermal comfort,a comparison experiment was conducted in three similar offices at temperatures of 24,26 and 28 ℃ respectively. A thermal comfort questionnaire survey was conducted. It is demonstrated that air-conditioner energy consumption at the set temperature of 28 ℃ is 113% and 271% lower than at 26 ℃ and 24 ℃,respectively. A linear relationship exists between air-conditioner energy consumption and the indoor and outdoor temperature difference. When comfortably dressed,over 80% of research participants accept the set temperature of 28 ℃. The regression analysis leads to a neutral temperature of 26.2 ℃ and an acceptable temperature of 28.2 ℃ for over 80% of the research participants subjects,indicating that the current 26 ℃ set temperature for offices in summer,required by Chinese General Office of the State Council,can be increased to 28 ℃. Moreover,analysis of predicted mean vote(PMV) index shows that a set temperature of 27 ℃,not 26 ℃,is sufficiently comfortable for office staff wearing long-sleeve shirts,long pants and leather shoes.

关键词： air-conditioning temperature thermal comfort air-conditioner energy consumption neutral temperature acceptable temperature

Application of Fuzzy Comprehensive Evaluation to air-conditioning Competitive Power Analysis

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武汉理工大学学报 2006年第S2期28卷 463-467页

作者： LU Congda LIU Gaojin JIANG Shaofei LV Chaoqun (The MOE Key Laboratory of Mechanical Manufacture and Automation,Zhejiang University of Technology,Hangzhou 310032,China The MOE Key Laboratory of Mechanical Manufacture and Automation Zhejiang University of TechnologyHangzhou 310032China

As the conceptual design of air-conditioning is done using the theory of Quality Function Deployment (QFD),cus- tomer requirements should be understood and the product competitive power be analyzed as exactly as possible for new product de- *** of information in the process of this research is fuzzy and uncertain,but traditional QFD can not deal with it well. Fuzzy theory can solve the *** a fuzzy model for analyzing product competitive power is formulated in this paper to im- prove traditional QFD,after that it is applied to analyze air-conditioning competitive *** air-conditioning competitive power is analyzed using this model,firstly the importance weight of the customer requirements o fair-conditioning is determined us- ing the Analytic Hierarchy Process (AHP) weighting process,then air-conditloning competitive power is evaluated using fuzzy comprehensive *** is proved that the model is feasible and has good applicability.

关键词： air-conditioning competitive power QFD AHP fuzzy comprehensive evaluation

Research on the Arrangement of Dew Point Temperature Detectors of Capillary Plane Radiation air-conditioning

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Journal of Power and Energy Engineering 2014年第4期2卷 76-81页

作者： Xuelai Liu Jie Wu School of Thermal Energy Engineering Shandong Jianzhu University Jinan China

Based on analysis of the reason and process of condensation on ceiling radiant cooling panels, two kinds of arrangement of detectors are put forward. The physical model is established, the results show that detectors are arranged as the form of triangle is more suitable. It can not only satisfy the use requirement but also it is economical and practical. Finally we can conclude that the inlet water temperature 0.5°C higher than dew point temperature is safe and reliable.

关键词： Capillary Plane Radiation air-conditioning Dew Point Temperature Detectors Arrangement

The Experiment and Simulation of Solid Desiccant Dehumidification for air-conditioning System in a Tropical Humid Climate

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Engineering（科研） 2013年第1期5卷 146-153页

作者： Juntakan Taweekun Visit Akvanich 不详

The aim of this research was to study and design a solid desiccant dehumidification system suitable for tropical climate to reduce the latent load of air-conditioning system and improve the thermal comfort. Different dehumidifiers such as desiccant column and desiccant wheel were investigated. The ANSYS and TRASYS software were used to predict the results of dehumidifiers and the desiccant cooling systems, respectively. The desiccant bed contained approximately 15 kg of silica-gel, with 3 mm average diameter. Results indicated that the pressure drop and the adsorption rate of desiccant column are usually higher than those of the desiccant wheel. The feasible and practical adsorption rate of desiccant wheel was 0.102 kgw/h at air flow rate 1.0 kg/min, regenerated air temperature of 55?C and at a wheel speed of 2.5 rpm. The humidity ratio of conditioning space and cooling load of split-type air conditioner was decreased to 0.002 kgw/kgda (14%) and 0.71 kWth (19.26%), respectively. Consequently, the thermal comfort was improved from 0.5 PMV (10.12% PPD) to 0.3 PMV (7.04% PPD).

关键词： Solid Desiccant Dehumidification air-conditioning System Tropical Humid Climate