Working fluids of a low-temperature geothermally-powered Rankine cycle for combined power and heat generation system
Working fluids of a low-temperature geothermally-powered Rankine cycle for combined power and heat generation system
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发电热联合发电系统低温地热朗肯循环的工作流体
DOI：
10.1007/s11431-010-4102-5
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发表时间：
2010-10
期刊：
影响因子：
--
通讯作者：
Zhang ShengJun
中科院分区：
文献类型：
--
作者：
Guo Tao;Wang HuaiXin;Zhang ShengJun
研究了一种新型的热电联产系统。该系统由低温地热有机朗肯循环(ORC)子系统、中间换热器和基于R134a的商用热泵子系统组成。这种新型的发电和供热联合系统的优点是不需要为发电子系统使用额外的冷却水循环系统，以及最大限度地利用低温地热源的热能。主要目的是确定可能产生高PPR(发电子系统产生的功率与热泵子系统消耗的功率的比率)值和QQR(供应给用户的热量与地热源产生的热量的比率)值的合适的工质(湿、等熵和干流体)。考察的参数为蒸发温度、PPR值和QQR值。结果表明，对于单个流体，存在一个最佳蒸发温度，使PPR值最大，QQR值最小。干液具有较高的PPR值和较低的QQR值。NH3和R152a在湿流体中表现突出。R134a在等熵流体中脱颖而出。R236ea、R245ca、R245fa、R600和R600a在干液中表现突出。在推荐的液体中，R236ea的PPR值最高。
A novel combined power and heat generation system was investigated in this study. This system consists of a low-temperature geothermally-powered organic Rankine cycle (ORC) subsystem, an intermediate heat exchanger and a commercial R134a-based heat pump subsystem. The advantages of the novel combined power and heat generation system are free of using additional cooling water circling system for the power generation subsystem as well as maximizing the use of thermal energy in the low-temperature geothermal source. The main purpose is to identify suitable working fluids (wet, isentropic and dry fluids) which may yield high PPR (the ratio of power produced by the power generation subsystem to power consumed by the heat pump subsystem) value and QQR (the ratio of heat supplied to the user to heat produced by the geothermal source) value. Parameters under investigation were evaporating temperature, PPR value and QQR value. Results indicate that there exits an optimum evaporating temperature to maximize the PPR value and minimize the QQR value at the same time for individual fluid. And dry fluids show higher PPR values but lower QQR values. NH3 and R152a outstand among wet fluids. R134a outstands among isentropic fluids. R236ea, R245ca, R245fa, R600 and R600a outstand among dry fluids. R236ea shows the highest PPR value among the recommended fluids.
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DOI：
10.1007/s11431-010-3123-4
发表时间：
2010-06
期刊：
Science China Technological Sciences
影响因子：
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