双级压缩跨临界CO_2热泵适合于低温地板辐射采暖.以北京市某建筑为对象,进行了双级压缩跨临界CO_2热泵中间冷却型式的优化分析.结果表明:与单级压缩循环相比,双级压缩循环提高了系统供热的性能系数(COP),并且双级压缩循环中间完全冷却的COP高于中间不完全冷却型式.同时在保持最佳中间冷却压力下,双级压缩中间不完全冷却型式的COP随着高压级压缩机入口CO_2蒸气过热度的增加而逐渐减小.因此在实际系统设计中,双级压缩跨临界CO_2采暖热泵宜采用中间完全冷却型式.
A two-stage trans-critical CO_2 heat pump is suitable for heating low-temperature radiant floor.For an architecture in Beijing,the intercooling pattern optimization of a two-stage trans-critical CO_2 heat pump is processed.Results indicate that the two-stage compression cycle has a higher coefficient of heating performance(COP)than that in a single stage compression cycle.For a two-stage compression cycle,the COP of a complete intercooling type is higher than an incomplete intercooling type.As the degree of superheated CO_2 vapor at higher stage compressor inlet increases,the COP of the incomplete intercooling type decreases under the optimum intermediate pressure.So when designing the actual system,the intercooling pattern of a two-stage trans-critical carbon dioxide heat pump should be a complete type.
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