研究空气冷却过程，当有湿交换时，必须要测量空气的焓差。
In studying air-cooling process with humidification or dehumidification, it is necessary to measure the enthalpy difference of air before and after the air - cooler.
比焓和焓差的计算关键是计算基准的确定，同时也离不开热容值的正确获取。
The key to calculate the specific enthalpy and enthalpy difference is to make sure of the benchmark as well as the value of heat capacity value.
风侧焓差法冷量计量方法的出现有助于促进国内冷量计量收费工作的推广开展。
The appearance of the air-side enthalpy difference metering method helps to boost the progress of the cooling metering and charging work in our country.
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