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The experimental verification on the optimal discharge pressure in a subcooler-based transcritical CO_2 system for space heating

机译：基于过冷器的跨临界CO_2空间供热系统最佳排放压力的实验验证

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To analyze the evaluation of the optimal discharge pressure in subcooler-based transcritical CO2 system, a prototype was tested under various working conditions. Experimental data showed that the power consumption increased while the heating capacity increased first and then kept unchanged even decreased with CO2 discharge pressure increased. Thus, COP increased first and then decreased, which verified the existence of the optimal discharge pressure in the subcooler-based system. The water temperature in CO2 gas-cooler exit rose obviously while that in R134a condenser exit reduced with discharge pressure increased. Besides, the optimal discharge pressure decreased with the decline in air temperature, water return temperature and water delivery temperature among the testing range. Comparing with the optimal discharge pressure in the single used transcritical CO2 system, the optimal value in the subcooler-based system was much higher, and the difference between the two pressures decreased with the air temperature decreased. (C) 2017 Elsevier B.V. All rights reserved.
机译：为了分析基于过冷器的跨临界CO2系统中最佳排气压力的评估，在各种工况下测试了原型。实验数据表明，随着CO2排放压力的增加，功率消耗先增加，热容量先增加，然后保持不变，甚至降低。因此，COP先升高后降低，这证明了基于过冷器的系统中存在最佳排气压力。随着排气压力的增加，CO2气冷器出口的水温明显升高，而R134a冷凝器出口的水温降低。此外，在测试范围内，最佳排气压力随着空气温度，回水温度和出水温度的降低而降低。与一次性使用的跨临界CO2系统中的最佳排放压力相比，基于过冷器的系统中的最佳排放压力值更高，并且随着空气温度的降低，两个压力之间的差值减小。 （C）2017 Elsevier B.V.保留所有权利。

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