文献类型：期刊文献

英文题名：A theoretical study of new-style cool storage air-conditioning systems with high-temperature water

作者：Chen, Ze-Shao[1]; Qi, Xue-Gui[2]; Cheng, Wen-Long[1]; Hu, Peng[1]

机构：[1]E China Univ Sci & Technol, Inst Proc Equipmnt & Pressure Vessels, Sch Mech Engn, Shanghai 200237, Peoples R China;[2]Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Peoples R China

年份：2006

卷号：38

期号：2

起止页码：90

外文期刊名：ENERGY AND BUILDINGS

收录：;EI(收录号：2005469480893);WOS:【SCI-EXPANDED(收录号:WOS:000233525500003)】；

语种：英文

外文关键词：cool storage; air-conditioning; high-temperature water; supercooling; temperature stratification; dynamic characteristics

摘要：Cool storage technology is an effective means of shifting peak electrical loads by storing cooling capacity during off-peak time. A new-style cool storage scheme working with high-temperature water for air-conditioning is introduced in this paper. By supercooling refrigerant before being throttled with 2-38 degrees C water, the refrigerating output is raised and the water's sensible heat is converted to cool energy to be used for cool storage air-conditioning. The characteristics and performance of three systems with different water cycle patterns, viz., unmixed, fully mixed and partially mixed, were theoretically analyzed and simulated. For an unmixed system, its performance is sensitive to g, the ratio of heat capacity flow rate of supercooling water to that of refrigerant, and the total cool storage efficiency reaches a max value when g = 1. For a fully mixed system, its performance changes with time and the supercooling efficiency decreases gradually. For a partially mixed system, a thermal transfer model for the thermally stratified water tank was established in order to simulate the time-dependent temperature profiles. The influences of water mass flow rate, design service time and tank height on its dynamic performance were investigated. The results help design, control and optimization of these systems. (c) 2005 Published by Elsevier B.V.