Technical requirements analysis of integrated paralleled-loop exhaust air heat pump system applied to ultra-low energy building in different climatic regions of China

Abstract

Based on the simulation results of the typical rural ultra-low energy building (ULEB) in 5 different climatic regions of China, three indicative technical parameters for paralleled-loop exhaust air heat pump (PEAHP) R&D- which are nominal heating/cooling capacity, maximum required fresh air to return air ratio (MFRR) and system energy efficiency grades- were calculated and summarized according to the demand of indoor thermal comforts by using statistic method. The nominal heating/cooling capacities were determined according to the peak loads, which are 6.84/2.01kW, 5/2.96 kW, 3.9/4.6 kW, 3.08/5.02 kW and 3.4/0.46 kW in the ULEB of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively. To ensure both thermal comforts and energy conservation, during the heating season, full fresh air supply is suggested in Beijing and the 1:0.5 MFRR is suggested in Harbin, Shanghai, Guangzhou and Kunming. During the cooling season, the 1:5 MFRR is suggested in Shanghai and Guangzhou, the 1:3, 1:1.5 and 1:0.5 MFRR are suggested in Harbin, Beijing and Kunming respectively. The PEAHP energy efficiency grades 1~5 are 7.92~11.7, 7.58~11.5, 7.5~11.35, 6.12~9.27 and 4.64~7.03 during the heating season of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively, and are 2.33~3.54, 3.93~5.96, 4.61~6.98, 4.62~6.99 and 2.04~3.1 for the cooling season respectively.