Performance analysis of water vapor quasi-saturated compression high temperature heat pump system

doi:10.11949/0438-1157.20221619

Abstract

Abstract:

The water vapor high temperature heat pump (HTHP) combines the environmental protection of natural working medium water and the energy saving of heat pump, and gives full play to the performance advantages of water working medium in the field of HTHP. The water-injection cooling effectively ensures the long-term safety, stability and efficient operation of the unit. In this paper, the possibility and the main problem of constructing reverse Carnot cycle in the heat pump system are analyzed. It is proved theoretically that continuous injection of low enthalpy water working medium into the working chamber during the process of water vapor compression can not only effectively reduce the exhaust superheat at the end of compression, but also improve the overall performance of the system. The influence of suction superheat and water-injection cooling times on system performance was theoretically analyzed, and it was concluded that the existence of suction superheat was not conducive to the improvement of system performance, while the increase of water-injection times was beneficial to system performance. However, when the water-injection times exceeded 5 times, the improvement of system performance was very slow. When the suction superheat was 20℃, COP decreased by 1.45%—1.54% compared with non-suction superheat. When the water-injection cooling times reached 30, COP increased by 3.10%—3.73% compared with one water-injection.

Key words: water working medium, quasi-saturation compression, water-injection cooling

摘要：

水蒸气高温热泵将自然工质水的环保性和热泵的节能性相结合，充分地发挥了水工质在高温热泵领域的性能优势，喷水降温更是有效地保证了机组的长期安全稳定与高效运行。分析了在热泵系统中构建逆卡诺循环的可能性，以及面临的主要问题，从理论上证实了在水蒸气压缩的过程中往工作腔内连续喷入低焓值的水工质来实现水蒸气的准饱和压缩，不仅能够有效地降低压缩终了的排气过热度，还有利于提高系统整体性能。针对吸气过热度和喷液冷却次数对系统性能的影响进行了理论分析，得出吸气过热度的存在不利于系统性能的提升，而喷液次数的增加则对于系统性能有利，但当喷液次数超过5次以后，系统性能的提升就十分缓慢了。当吸气过热度为20℃时，和无吸气过热度相比，COP降低了1.45%~1.54%；当喷水次数达到30次，和1次喷水相比，COP提升了3.10%~3.73%。

关键词: 水工质, 准饱和压缩, 喷水降温

CLC Number:

TK 123

Di WU, Bin HU, Ruzhu WANG, Junyu LIANG. Performance analysis of water vapor quasi-saturated compression high temperature heat pump system[J]. CIESC Journal, 2023, 74(S1): 45-52.

吴迪, 胡斌, 王如竹, 梁俊宇. 水蒸气准饱和压缩高温热泵循环性能分析[J]. 化工学报, 2023, 74(S1): 45-52.

Figures/Tables 7

Fig.1 Classification of heat pumps based on heating temperature[2]

Fig.2 The p-v and T-s diagram of heat pump system

Fig.3 The p-v and T-s diagram of heat pump system with inter-cooling

Fig.4 The T-s diagram of quasi-saturation compression of water vapor heat pump system

Fig.5 The schematic diagram of water vapor heat pump system with one time water-injection

Fig.6 Impact of suction superheat on system performance

Fig.7 Impact of water-injection times on system performance

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