以下为句子列表：
英文: Based on the refrigerant state, divides a heat exchanger into three zones with zoned lump method, i. e. superheat, two-phase and subcooling zones, works out the temperature difference and heat transfer coefficients of the three zones.
中文: 采用分区参数法将换热器按制冷剂状态分为过热、两相、过冷三区，分别计算了各区的换热温差、传热系数等。
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英文: The absence of both high and low side service valves precluded measurement of superheat and subcooling correctly.
中文: 在上面和下面都应该安装检修阀,以便温度过高和过低时能够准确的测量.
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