Simulation Study on Floor-Heating Characteristics of Refrigerant Direct Condensing Capillary Pipes with Air Source Heat Pump

Le résumé fourni par la source

To clarify the heating characteristics of the refrigerant direct condensing capillary pipe floor (CPF) used in an air source heat pump (ASHP), simulation studies were conducted. Based on a practical CPF structure with a pipe diameter of 3 mm, the heating characteristics of the condensing and superheated sections were simulated in a steady state. For the refrigerant condensing section, the heating parameters of floor surface temperature (FST) and heat flux (HF) are analyzed by considering different floor surface material, pipe spacing, room temperature, and condensing temperature. For the superheated section, possible solutions to reduce the high FST are the main concern. It is found that mean FST and HF generally increase with higher thermal conductivity of the surface material, smaller pipe spacing, higher condensation temperatures, and lower indoor temperatures. The results are arranged in linear diagrams, which can be referred to easily in the design and operation of the CPF system. Increasing the covering thickness is found to be more effective than increasing the pipe spacing to decrease the FST of the superheated section. Considering practical feasibility, increasing covering thickness with enlarged pipe spacing is recommended. The study provides comprehensive data of HF and FST under different CPF structures, which can be referred to to guide the application of this heating technique in ASHP systems.

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