Standard Cold Source Based on Ice Slurry Refrigeration and Uncertainty Analysis

The problem of inconsistency between the measurement results of the cooling capacity of room air conditioners between environmental chambers still plagues China′s air-conditioning industry and is a meteorological problem that easily leads to conflicts in international trade. A standard cold-source device that can calibrate laboratory measurement results of the enthalpy difference needs to be urgently studied. In this study, a standard cold-source device based on ice slurry refrigeration is proposed, including an ice slurry preparation system and a heat exchange system, based on a study of several mainstream cooling capacity measurement methods for room air conditioners and the research status of standard cold-sources at home and abroad, combined with an in-depth understanding of the physical process of ice slurry refrigeration. Experimental research and refrigeration capacity uncertainty analysis are conducted to verify whether the standard cold-source device could calibrate the enthalpy difference laboratory. The experimental results show that the relative uncertainty of the measured cooling capacity of the standard cold-source device in the enthalpy difference chamber can reach 1.2% when setting 0 ℃ on the ambient side and setting the standard cooling condition on the room side with mass flow rate of 70 g/s, which is approximately 1/3 of the air enthalpy method and can be used as a standard cold source to calibrate the cooling capacity measurement results of the enthalpy difference chamber, which can help improve the international competitiveness of the refrigeration industry.