Cascade air-source heat pump with R410A single fluid

doi:10.11949/0438-1157.20190911

Abstract

Abstract:

In the light of the problems existing in the application of air source heat pump in cold regions, a new single-fluid cascade air-source heat pump (SC-ASHP) has been developed, combining with cascade cycle and compressor DC speed regulation technology. The new-type heat pump can operate not only in a single-stage heating cycle (SHC) mode, but also in a cascade heating cycle (CHC) mode. Under different operating conditions, simulation calculations and experimental studies were performed on the compression ratio, exhaust temperature, heating capacity, and coefficient of performance (COP) of the SC-ASHP system in two different heating modes. The results show that, in low temperature environment, the compressor discharge temperature and the compression ratio of the CHC mode are much lower than the SHC mode; when the condensing temperature of 46℃ and an evaporating temperature of -35℃, COP of the CHC mode is higher than 1.8, the compressor discharge temperature is lower than 120℃, and the compression ratio is not more than 5.0, the system can operate stably and reliably; in addition, the heating capacity is rising steadily by increasing the speed of the low temperature compressor in low temperature environment, meeting the heating supply. New heat pump system expanded the application range of air source heat pump system.

Key words: heating, cascade, COP, variable speed compressor, simulation

摘要：

针对空气源热泵在寒冷地区应用中存在的诸多问题，结合复叠式循环与压缩机直流调速技术，提出一种采用R410A单一工质的复叠式空气源热泵(SC-ASHP)系统，既可以按照传统单级压缩制热（SHC）模式运行,又可按复叠式制热（CHC）模式运行。不同工况下，对SC-ASHP系统在两种不同制热模式运行时的压缩比、排气温度、制热量与性能系数（COP）进行了模拟计算与实验研究，结果表明：低温环境下，CHC模式压缩比和排气温度远低于SHC模式；在冷凝温度46℃，蒸发温度-35℃工况下，CHC模式COP高于1.8，压缩机排气温度低于120℃，高低温压缩机压缩比均不超过5.0，系统可以稳定可靠运行；此外，CHC模式下提高低温压缩机转速可以持续提高系统制热量，满足低温环境下的供暖需求；新系统扩大了空气源热泵系统的应用范围。

关键词: 制热, 复叠式, 性能系数, 变速压缩机, 模拟

CLC Number:

TK 519

Yong an YANG, Ruishen LI, Kun LI, Tianhui SUN. Cascade air-source heat pump with R410A single fluid[J]. CIESC Journal, 2020, 71(4): 1812-1821.

杨永安, 李瑞申, 李坤, 孙天慧. 采用R410A单一工质的复叠式空气源热泵[J]. 化工学报, 2020, 71(4): 1812-1821.

Figures/Tables 13

Fig.1 Schematic diagram of SC-ASHP system

Table 1 State of every valve and compressors

Mode

Solenoid

valve-Ⅰ

Solenoid

valve-Ⅱ

Solenoid

valve-Ⅲ

Four-way

valve

EEV-Ⅰ

EEV-Ⅱ

Upper stage

compressor

Lower stage

compressor

Fig.2 SC-ASHP cycle

Fig.3 Test bench of C-ASHP system

Table 2 Main equipment of experiment system

Equipment	Model	Manufacturer
lower-stage compressor	LNB42FSCMC	MITSUBISHI
upper-stage compressor	TNB220FFEMC	MITSUBISHI
electronic expansion valve	E2V30BSM00， E2V24BSM00	CAREL
electric control valve	VAI61.20-6.3	SIEMENS
solenoid valve	EVR15	DANFOSS
cascade heat exchange	A=3.10 m²	AIBAOSY
evaporator	? 9.52 mm，1.73 m²	—
electric heating tube	12 kW	—
condenser	n=5，A=3.47 m²	DONGDA
water tank	1250 mm×700 mm×1250 mm	—

Fig.4 Comparison of discharge temperature

Fig.6 Experiment comparison of compression ratio

Fig.5 Simulation comparison of compression ratio

Fig.7 Variations of heating capacity under different lower-stage compressor speed by simulation

Fig.8 Variations of heating capacity under different lower-stage compressor speed by experiment

Fig.9 Variations of COP under different lower-stage compressor speed

Fig.10 Comparison of heat capacity

Fig.11 Comparison of COP

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