Energy Consumption Analysis And Comfort Investigation Of Refrigerant Radiant Cooling And Heating System

With the rapid development of modern architecture, the proportion of building energy consumption is increasing, and the resources and environmental problems caused by it have become increasingly intensified. In recent years, people pay more attention on the indoor air quality and construction energy consumption. Traditional air conditioning system cannot fully meet people’s higher requirements on indoor thermal comfort and energy saving, therefore, it has become a new area for HVAC industry to seek of new forms of air conditioning system. Refrigerant radiant system for cooling and heating combines the air-source heat pump, heat supply by utilizing the energy released in the process of condensation and evaporative cooling and temperature and humidity control system together, which, with a cheerful prospect, makes it feasible for cooling in summer and heating in winter. Refrigerant radiant system is a new form in construction for cooling and heating system, thus, analysis the comfort and energy-saving effect of the air conditioning room can provides a certain theoretical basis and reference data for the engineering design and application.This paper takes a sample office in Zhengzhou as a prototype and designs it with refrigerant radiant system for cooling and heating; then it adopts k-ε model and DO radiative transfer model to analyze on the thermal comfort and consumption of refrigerant radiant system for cooling and heating under standard conditions of heat pump with the help of software Airpak3.0. In order to discuss the comfort of the refrigerant radiant system for cooling and heating under different distance between tubes, this paper chooses the often-used coil spaces 80 mm, 100 mm and 120 mm. Simulating the working process of refrigerant radiant system for cooling and heating with the assistance of EnergyPlus, and comparing different daily cooling energy and heating energy consumption under different distance between tubes.The simulation results prove that it can meet indoor people’s comfort requirements by adopting refrigerant radiant system for heating, while, it has a higher degree of satisfaction for people’s comfort requirements for cooling within 0.36 m under standard conditions which its evaporation temperature is 10, the condensing temperature is 35 based on the 100mm-tube-distance system. In the case of other parameters unchanged, such as tube spacing, floor structure parameters, refrigerant parameters, indoor design temperature.etc, the 80mm-tube-distance system, the 100mm-tube-distance system and the 120mm-tube-distance system can meet people’s comfort requirements for heating. But the 80mm-tube-distance system mostly cannot meet people’s comfort requirements for cooling; the 100mm-tube-distance system has a higher dissatisfaction for cooling under 0.36m; the 120mm-tube-distance system has a higher dissatisfaction for cooling under 0.09 m. It comes that in the case of mostly satisfying the comfort in the working area, the 120mm-tube-distance system consumes 50 watt less than that of the 100mm-tube-distance system for cooling, while 30 watt more than the 100mm-tube-distance system for heating.