水焓值法制冷量源装置的计量特性

Metrological characteristics of water-enthalpy method cooling capacity source

水焓值法制冷量源能够应用于制冷量的量值传递,提供数值可测、可控的制冷量量值。首先提出了水焓值法制冷量源原理,并在该原理基础上设计和研制了制冷量源装置的物理结构。然后在空气焓值法实验室中对制冷量源进行了实验测量,由风机功率转化实验结果可知风机消耗功率完全转化为空气焓值的增加,并可通过焓差室测量。最后对制冷量源装置进行了稳定性研究和不确定度评定,由实验结果分析可知稳态运行30 min输出制冷量标准差为22.2 W(制冷量5251.9 W),相对扩展不确定度为0.6%(k=2)。水焓值法制冷量源装置第一次从计量学角度实现了制冷量量值的溯源,输出量值可溯源至温度、压力、流量和电功率。

The water-enthalpy method cooling capacity source could be applied in the calibration of cooling capacity measuring apparatus. It could supply a cooling capacity which was measurable and controllable.First, the principle of water-enthalpy method was illustrated, then the physical structure of the source was designed and developed.After that, the source was experimentally investigated in an air enthalpy method test room s,the results of the energy transformation of fan’s electric power experiments showed that:the fan’s electric power transformed into thermal energy totally and the energy could be measured by air enthalpy method test room s.Finally,the stability experiment and the evaluation of uncertainty were conducted,the results showed that the outputted cooling capacity standard deviation of 3 0 min was 2 2.2 W (cooling capacity 5 2 5 1.9 W ) and the related expanded uncertainty was 0.6 % (k = 2 ).This source achieved the traceability of cooling capacity from the perspective of metrology for the first time,and the cooling capacity could be traced to temperature,pressure,flow rate and electric power.