Performance analysis for a new hybrid air conditioning system in hot-humid climates by simulation. (September 2020)

• Record Type: Journal Article
• Authors: Yang, Yang; Ren, Chengqin; Tu, Min; Luo, Baojun; Yang, Congcong; Fu, Jianqin
• Is Part Of: International journal of refrigeration. Volume 117(2020)
• Page Start: 328
• Page End: 337
• Publication Date: 2020-09
• Subjects: Hybrid air conditioning system -- Evaporative cooling -- Dual-evaporator air-conditioning system -- Parametric analysis -- Energy-saving potential; Système de conditionnement d'air hybride -- Refroidissement évaporatif -- Système de conditionnement d'air à double évaporateur -- Analyse paramétrique -- Potentiel d'économie d'énergie; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2020.05.008
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlight: A dual-evaporator system couples with a new fresh air conditioner. Five independent affecting parameters are included for parametric analysis. Four typical cities are selected for energy-saving potential evaluation. Average seasonal energy-saving rate is 48.87%. Average seasonal power saving per hour is 24.85 W m −2. Abstract: Energy recovery, evaporative cooling and multiple evaporator are regarded as the effective and energy-efficient techniques to improve the energy efficiency of air conditioning system and reduce building energy consumption. In this paper, a parametric analysis and energy-saving potential evaluation for a new hybrid air conditioning system (HAC) under hot-humid climates are carried out theoretically based on detailed models. The proposed HAC incorporates into a dual-evaporator air conditioning system with an independent fresh air conditioner for both total and sensible energy recovery. One evaporator is installed between the total and sensible energy recovery loop of the fresh air conditioner to deeply dehumidify the fresh air for indoor humidity control. The other evaporator is installed inside the conditioned room to handle the indoor return air for temperature and humidity independent control. The parametric analysis mainly for the effect of air-to-water heat capacity ratio, ambient temperature, enthalpy-humidity ratio of the air-conditioned room and the number of heat/mass transfer units of the internal heat exchangers. The energy-saving potential of the HAC is also evaluated for applications in four typical cities (Changsha, Guangzhou, Fuzhou and Hangzhou) located in southern China over the summer period (June–August). The results show that, for the same air supply requirement, the HAC has an average energy-saving rate of 48.87% compared to conventional system with electric heater, and its power saving per hour is 24.85 W m −2 .