一种新型CO2工质冷热电联供系统的热力性分析
摘要：为了开发利用太阳能、地热能、工业余热等低品位热能， 提出一种以CO2作为工质的冷热电联供系统，该系统通过共用气体冷却器的方式将超临界CO2布雷顿发电循环和跨临界CO2压缩式制冷循环进行耦合，可同时向用户提供电力、冷媒水和生活热水。建立了该系统的热力学数学模型，并对其运行工况进行了数值模拟，模拟结果表明：系统净输出功为140.34 kW，制冷量为340.50 kW，制热量为5 332.75 kW，热效率为113.27%，?效率为41.24%；随后在此基础上对系统进行了热力学参数敏感性分析，获得了透平进口压力、透平出口压力、透平进口温度、蒸发器压力和顶循环与底循环CO2流量比5个热力参数对系统性能的影响。
Abstract:In order to develop and utilize low-grade thermal energy such as solar energy, geothermal energy, industrial waste heat, etc, this paper proposed a combined cooling, heating and power system using CO2 as the working fluid. The system, coupling the supercritical CO2 Brayton power generation cycle and the transcritical CO2 compression refrigeration cycle by sharing the condenser, can provide users with electricity, refrigerant water and domestic hot water at the same time. This paper established the thermodynamic mathematical models of the proposed system in detail, and conducted numerical simulation of its operating conditions. The simulation results showed that the net output power of the simulated system is 140.34 kW, cooling capacity is 340.50 kW, heating capacity is 5 ?332.75 kW, thermal efficiency is 113.27%, and exergy efficiency is 41.24%. Then, on this basis, the sensitivity analysis of thermodynamic parameters of the system was carried out, and the effects of five thermodynamic parameters, including turbine inlet pressure, turbine outlet pressure, turbine inlet temperature, evaporator pressure and CO2 flow ratio of top cycle and bottom cycle, on the performance of the system were obtained.
标题：一种新型CO2工质冷热电联供系统的热力性分析
title:Thermodynamic Analysis of a New Combined Cooling, Heating and Power System Using CO2 Working Fluid
作者：高垚楠, 陈海峰, 王建永
authors:Yaonan GAO, Haifeng CHEN, Jianyong WANG
关键词：二氧化碳,冷热电联供,数值模拟,参数分析,
keywords:carbon dioxide,combined cooling, heating and power,numerical simulation,parameter analysis,
发表日期：2022-02-28
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