Application of an Air Source Heat Pump System with a Three-Cylinder Two-Stage Variable Volumn Ratio Rotary Compressor

doi:10.16183/j.cnki.jsjtu.2019.269

Abstract

Abstract:

Aimed at the problem of the compressors of the low temperature air source heat pump system, this paper analyzes the impact of volume ratio on performance and proposes a novel three-cylinder two-stage variable volume ratio rotary compressor. The performance of the proposed compression system is compared with that of the traditional two-stage compression system of the same terminal in the experiments. The results show that the three-cylinder two-stage system operates in a stable manner with a coefficient of performance (COP) of 1.52 at a ambient temperature of -30 ℃,while the traditional two-stage system does not work. The COP of the three-cylinder two-stage system is always 1.25% to 12.41% higher than that of the traditional two-stage systems at any ambient temperature. When the ambient temperature is stable and the water supply temperature increases, the amount of dissipated heat at the terminal increases. At the same time, the maximum heat of external machine decreases, as well as the COP. When the ambient temperature is 7 ℃ and -25 ℃ respectively, and the water supply temperature changes from 40 ℃ to 55 ℃,the COP of the three-cylinder two-stage system is 1.15% to 8.86% and 4.32% to 7.33% higher than that of the traditional two-stage system, respectively. The power consumption of the three-cylinder two-stage system is always 3.78% to 16.67% lower than that of the traditional two-stage system.

Key words: three cylinders compressor, variable volume ratio, air source heat pump, two-stage compression

CLC Number:

TB61

XIAO Biao, YAN Yan, ZHAO Shunan, HUANG Tongyi, LI Xiang. Application of an Air Source Heat Pump System with a Three-Cylinder Two-Stage Variable Volumn Ratio Rotary Compressor[J]. Journal of Shanghai Jiao Tong University, 2021, 55(2): 188-195.

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结构	材料	厚度/mm	容重/(kN·m^－3)	导热系数/(W·m^－1·K^－1)	热惰性指标	导热修正系数
外墙	保温层	5	1 800	0.93	0.06	1.00
	挤塑聚苯板	50	30	0.03	0.61	1.15
	加气混凝土砌块	250	700	0.22	4.10	1.25
	水泥砂浆	20	1 800	0.93	0.24	1.00
内墙	水泥砂浆	20	1 800	0.93	0.24	1.00
	加气混凝土砌体	210	700	0.22	4.10	1.25
	水泥砂浆	20	1 800	0.93	0.24	1.00
地板	水泥砂浆	30	1 800	0.93	0.37	1.00
	防水卷材	4	580	0.15	0.16	1.00
	C20 混凝土	100	2 300	1.51	1.02	1.00
	水泥砂浆	20	1 800	0.93	0.24	1.00
	挤塑聚苯板	70	30	0.03	0.85	1.25
	水泥砂浆	20	1 800	0.93	0.24	1.00
	钢筋混凝土	120	2 500	1.74	1.19	1.00
	水泥砂浆	20	1 800	0.93	0.24	1.00
天花板	水泥砂浆	30	1 800	0.93	0.37	1.00
	防水卷材	4	580	0.15	0.16	1.00
	水泥砂浆	20	1 800	0.93	0.24	1.00
	挤塑聚苯板	70	30	0.03	0.85	1.25
	水泥砂浆	20	1 800	0.93	0.24	1.00
	钢筋混凝土	120	2 500	1.74	1.19	1.00
	水泥砂浆	20	1 800	0.93	0.24	1.00

测试系统	T_a/℃	T_s/℃
传统双级系统/三缸双级系统	7	45
	0
	－7
	－15
	－20
	－25
	－30

测试系统	T_a/℃	T_s/℃
传统双级系统/三缸双级系统	7	40
		45
		50
		55
	－20	40
		45
		50
		55