Heatmass Transfer in Seasonal Natural Cold Storage Facilities for Air Conditioning Systems

Abstract

The process of heat and mass transfer between the air flow and the natural source of cold - ice is considered. It includes heat exchange by sensible heat and moisture exchange through latent heat transfer. This type of heat and mass transfer is observed in seasonal refrigeration storages for air conditioning systems. Snow or ice frozen during the cold season is used as a natural source of cold. The experimental setup created conditions for the contact of the flow of thermal air and natural sources of cold. The air flow is uniform. For this, the setup was carried out. Based on the analysis of experimental data, equations were obtained that determine the process of heat and moisture exchange. These are the dependences of the thermal Nusselt number on the Reynolds number and the diffusion Nusselt number on the Reynolds number. The heat transfer equations were compared with the previously obtained equations for non-uniform air flow in the experimental setup. Heat transfer with a uniform air flow is less intense at high Reynolds numbers from the considered interval. However, at lower air flow rates, the thermal Nusselt numbers become higher than at nonuniform air flow. These dependencies make it possible to calculate the dimensions of the required surface of contact of air with a natural source of cold for designing seasonal refrigeration storages.KeywordsCold accumulationHeat exchange (transfer)Moisture exchangeConditioningThermodynamic parameters