复叠式高温热泵系统高温级喷气增焓技术应用模拟分析

Simulation analysis of the application of vapor-injection technology for high-temperature stage of compounded high-temperature heat pump system

摘要

为进一步突破复叠式热泵系统在工业高温供热领域的技术瓶颈，提升热泵系统能效与运行稳定性，助力节能减排，本研究将喷气增焓技术应用于复叠式高温热泵系统高温级，利用ASPEN PLUS软件构建了以R410A/R123制冷剂为低温级与高温级制冷剂的复叠式高温热泵系统，分析蒸发温度、冷凝温度、中间换热温度以及喷气比和补气压力等参数对系统性能的影响。结果表明：在制热温度高于100℃的工况下，复叠式高温热泵机组采用喷气增焓技术能有效降低高温级压缩机排气温度，提高系统性能系数(coefficient of performance，COP)；在最佳工况下，压缩机排气温度降低了4.45℃，压缩机功耗减少了32.38%，COP提高了19.64%；但通过调节系统补气参数，则可在保障制热量的同时降低系统能耗与排气温度。

Abstract

To overcome the technical limitations of cascade heat pump systems for industrial high-temperature heating, improve the energy efficiency and operational stability, and promote energy conservation and emission reduction, this study applied vapor injection technology to the high-temperature stage of a cascade high-temperature heat pump system. A cascade model using R410A and R123 as refrigerants for the low-temperature and high-temperature stages, respectively was developed in ASPEN PLUS. The effects of evaporating temperature, condensing temperature, intermediate heat transfer temperature, vapor injection ratio, and injectio pressure on system performance were systematically investigated.. Results indicate that ejector enthalpy technology significantly reduces high-temperature compressor discharge temperature and enhances the coefficient of performance (COP) under heating conditions exceeding 100℃, with a maximum discharge temperature reduction of 4.45℃, compressor power consumption reduction of 32.38%, and COP improvement of 19.64% under optimal conditions. Furthermore, by optimizing the vapor injection parameters, both energy consumption and compressors discharge temperature can be simultaneously minimized while maintaining the required heating capacity.

关键词

复叠式热泵 / 喷气增焓 / 补气状态 / 系统性能

Key words

cascade heat pump / vapor-injection entropy enhancement / vapor injection condition / system performance

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基金资助

山东省自然科学基金面上项目(ZR2022ME102)

济南市科研带头人工作室项目(202333050)

山东省科技型中小企业创新能力提升工程项目(2023TSGC0052)

山东省科技型中小企业创新能力提升工程项目(2023TSGC0074)