Performance of Solar Vacuum Tube Water Heater-Air Source Heat Pump System in Cold Area

doi:10.16183/j.cnki.jsjtu.2022.005

Abstract

Abstract:

To improve the stability of solar heating and reduce the high cost of air source heat pump heating, the idea of air source heat pump assisted solar stable heating was proposed. A solar vacuum tube water heater-air source heat pump system was developed and bulit in Weiling Township, Qilihe District, Lanzhou, Gansu Province. The performance of the system was compared to analyze the heat collection efficiency, heat pump coefficient of performance (COP), solar energy guarantee rate, and energy efficiency ratio under sunny, overcast, and cloudy conditions. The results show that the effective heat obtained by solar energy under sunny, overcast, and cloudy conditions is 75.5 kW·h, 4.1 kW·h, and 49.2 kW·h respectively, the system heat collection efficiency is 61.3%, 26.6%, and 55.2%, the average coefficient of performance(COP) of the solar heat pump is 3.6, 3.4, and 3.6, the average COP of the air source heat pump is 0, 2.9, and 3.1, the actual heat supply of the system is 113.4 kW·h, 125.9 kW·h, and 124.8 kW·h, the system power consumption is 33.4 kW·h, 50.5 kW·h, and 42.7 kW·h, the system solar energy guarantee rate is 66.6%, 3.3%, and 39.4%, and the system energy efficiency ratio is 3.4, 2.5, and 2.9 respectively. The research results prove that the solar vacuum tube collector-air source heat pump system is feasible for heating and provide a new way for heating in cold areas.

Key words: solar vacuum tube water heater, air source heat pump, heat collection efficiency, coefficient of performance (COP), solar fraction, system energy efficiency ratio

CLC Number:

TK529

LI Jinping, DONG Yuhui, LI Caijun, DAI Jingbo, NIU Yinan, NOVAKOVIC Vojislav. Performance of Solar Vacuum Tube Water Heater-Air Source Heat Pump System in Cold Area[J]. Journal of Shanghai Jiao Tong University, 2023, 57(7): 910-920.

Figures/Tables 21

Tab.1

Fig.1

Fig.2

Fig.3

Tab.2

Tab.3

Corresponding table of measured and calculated parameters

计算参数	测量参数	测量仪器
太阳能集热器组有效利用热量,Q_s	热水流量,M'	流量计
	储热水箱温度,T_tank	温度传感器
	水箱出口温度,T_t,out	温度传感器
	水箱进口温度,T_t,in	温度传感器
太阳能热水器组日平均集热效率, $η - P V$	太阳能集热器组采光面接收到的瞬时太阳辐射强度,I_t	太阳辐射仪
热泵机组实际制热量,Q_h	热水流量,M'	流量计
	冷凝器进口温度,T_c,in	温度传感器
	冷凝器出口温度,T_c,out	温度传感器
热泵, λ_COP	压缩机的耗电量,W_h	功率表
建筑冬季采暖热负荷,Q	热水流量,M'	流量计
	末端进口温度,T_m,in	温度传感器
	末端出口温度,T_m,out	温度传感器
太阳能保证率,f	—	—
系统能效比, η_SEER	系统能耗,W	功率表

Tab.3

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围护结构	材料类型	厚度/ mm	导热系数λ/ [W·(m·K)^-1]
墙体内外表面	水泥砂浆	5	0.93
外墙	多孔砖	240	0.6
屋顶	双面彩钢泡沫夹芯复合板	100	0.422
门	普通钢制	80	1.5
窗	普通中空玻璃	3	3.1

设备型号	规格参数	厂商
HJF-S3风速仪	量程:0~70 m/s,精度:±0.3%	锦州天诺环能仪器有限公司
JTBQ-2太阳总辐射表	量程:0~2 kW/m²,精度:±2%,灵敏度:7~14 μV/(W·m²)	锦州天诺环能仪器有限公司
LWGY-MIK-DN25-C流量计	输出信号:4~20 mA,量程:0~1 m³/h,精度:±1.0%	杭州美控自动化技术有限公司
Pt100温度传感器	量程:-50~150 ℃,精度:A级	杭州美控自动化技术有限公司
DFM-W-AC-D-P1功率表	输出信号:4~20 mA,量程:0~1.1 kW,精度:±0.4%	创鸿仪表有限公司
DSW-9603-A-B功率表	输出信号:4~20 mA,量程:0~44 kW,精度:±0.4%	创鸿仪表有限公司