Operation performance analysis on a novel solar heat recovery quasi two-stage compression heat pump system under typical weather conditions

doi:10.3969/j.issn.2097-0706.2023.04.011

Abstract

Abstract:

To solve the problems of current energy consumption in building heating/cooling， a novel solar heat recovery quasi two-stage compression heat pump is proposed to be applied in heating/cooling systems. A system simulation model is established to analyze its operation performance under typical climatic conditions of three regions in China （Chongqing， Taiyuan and Urumqi）. The research results show that the system can provide heat and cold energy for buildings with the new heat recovery technology， solar photovoltaic and solar thermal technologies. The recovered energy of Chongqing， Taiyuan and Urumqi takes about 12% of their total loads， and solar thermal energy of the three regions makes up 30%， 20% and 15% of their total loads， and PV profits accounted for 38%， 26% and 18% of their total operating costs， respectively. It can be seen that renewable energy plays a key role in new systems by greatly improving system performance and reducing carbon emissions.

Key words: solar heat pump, heating and cooling, heat recovery, secondary compression heat pump, solar heat pump heating, system performance investigation

CLC Number:

TK019：TP391.9

LIN Lianjie, FAN Yi, LI Jing, ZHAO Xudong, LI Yunhai. Operation performance analysis on a novel solar heat recovery quasi two-stage compression heat pump system under typical weather conditions[J]. Integrated Intelligent Energy, 2023, 45(4): 74-80.

Figures/Tables 13

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Table 1

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Table 2

System control strategies

时间	运行模式	条件	控制详情
白天	系统停滞	$t r = 23 ℃ t b t < t u p t$	除了太阳能电池板阵列和热回收装置，整个系统停止运行(AD: a)
	太阳能蓄热	$t r ≥ 23 ℃ t b t - 5 ℃ ≥ t u p t$	收集到的太阳能从快速响应储热换热器的底部转移到上部，储存起来供以后使用(PL:1，6； AD: a)
	太阳能底部供热	$t r < 18 ℃ t b t > 42 ℃$	收集的太阳能直接从快速响应储热换热器的底部用于空间加热(PL: 4; AD: a)
	太阳能蓄热与放热	$t r < 18 ℃ t b t > 42 ℃ t b t - 5 ≥ t u p t$	收集到的太阳能被传输和储存到快速响应储热换热器的上部，同时系统从快速响应储热换热器的下部提供空间加热(PL: 4，1，6； AD: a)
	太阳能与热泵底部供热	$t r < 18 ℃ t b t < 38 ℃$	来自太阳能集热器和热回收式准二级压缩热泵的热量同时加热快速响应储热换热器的底部，空间加热由快速响应储热换热器的底部提供(PL: 4，2，5；AD: b)
	太阳能和热泵加热	$t r < 18 ℃ t b t < 35 ℃$	由于快速响应储热换热器底部温度较低，系统无法为居民提供空间供暖，采用太阳能集热器和热回收式准二级压缩热泵同时对快速响应储热换热器底部进行加热(PL: 2，5；AD: b)
	家庭热水采暖	$t b t > 50 ℃ t b t > t d h t$	家用热水加热控制策略不与其他系统组件相关联，仅在白天模式下由快速响应储热换热器底部温度控制
夜间	系统停止	$t r ≥ 23 ℃$	除热回收装置外，整个系统停止(AD: a)
	储能供热	$t r < 18 ℃ t b t > 35 ℃$	在夜间模式下，快速响应储热换热器上部储存的热量优先用于提供空间供暖(PL: 3；AD: a)
	热泵运行	$t r < 18 ℃ t u p t < 32 ℃ t b t < 35 ℃$	由于快速响应储热换热器底部温度较低，系统无法为居民提供空间供暖，采用热回收式准二级压缩热泵对快速响应储热换热器底部进行加热(PL: 2，5；AD: b)
	热泵底部供热	$t r < 18 ℃ 35 ℃ < t b t < 45 ℃$	热回收式准二级压缩热泵用于加热快速响应储热换热器的底部部分；同时，系统从快速响应储热换热器底部提供空间加热(PL: 4,2,5；AD: b)
	底部供暖	$t r < 18 ℃ t b t > 45 ℃$	该系统从快速响应储热换热器的底部提供空间加热(PL: 4；AD: b)

Table 2

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Table 3

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设备名称	尺寸	单位	数量	技术参数
光伏板	1 m×2 m	块	4	最大输出功率300 W
微通道集热器	1 m×2 m	块	8	最大输出功率1 000 W
新型热回收式准二级压缩热泵	1.5 m×0.5 m×1.0 m	台	1	额定产热量12 000 W
快速响应储热/换热器	直径1.19 m，高1.38 m	台	1	储水量1.5 m³
热回收装置	0.3 m×0.8 m×0.5 m	台	1	流量250 m³/h
地暖盘管	盘管直径16 mm	m	300	材料PE-X

建筑部分	建筑结构	传热系数
墙体	240 mm混凝土+8 mm粘结砂浆+50 mm外墙聚苯板保温+10 mm外饰面	0.42
外门	松木板木门	2.90
窗户	3mm双层断桥铝铝合金窗	1.54
屋顶	水泥层+防水层+保温窗	0.37