Summer Application Of THIC Air Conditioning System Based On Air Source Heat Pump In Residential Of Areas With Hot Summer And Cold Winter

In areas with hot summer and cold winter,the summer there is hot and humid,at present,local residential buildings mainly use split-type room air conditioners to adjust indoor air,since this type of air conditioning adopts a heat and moisture coupled air treatment method,there are disadvantages such as low energy efficiency ratio and poor indoor thermal comfort.In recent years,independent temperature and humidity control technologies have provided new directions for energy-saving optimization of airconditioning systems,however,it is an important issue for current THIC airconditioning system research to rationally configure THIC air-conditioning systems in residential buildings out of energysaving and better indoor thermal comfortIn this paper,the adaptability of THIC air conditioning system for residential buildings in hot summer and cold winter areas is analyzed theoretically.Then the test room of THIC air conditioning system based on air source heat pump in Jiangbei District of Chongqing city was taken as the research object.Firstly,the reliability of TRNSYS energy simulation was verified by comparing the measured data of the test room with the TRNSYS simulation results under the measured outdoor weather parameters.Through the problems found in the actual measurement,the corresponding optimization plan was put forward,and on this basis,the energy simulation platform for different scenarios was established.Based on the Chongqing typical summer weather days,the energy consumption and indoor comfort of different schemes were separately analyzed and analyzed,and the best solution was proposed.Finally,the annual cost of different schemes is calculated,the economy of different schemes are discussed.Research indicates:(1)The air source heat pump is used as the cold source,and the THIC air conditioning system based on the condensation dehumidification is suitable for the residential buildings in the hot summer and cold winter areas.(2)Field test of a test room with THIC air conditioning system in Chongqing was carried out.The main TRNSYS components modules of capillary radiation system,fresh air system and chilled water system were established by TRNSYS software,and TRNSYS energy consumption model was established to calculate.The simulation reliability of TRNSYS energy consumption is verified by comparison with the measured data.(3)Since the pump model of the air conditioning system is too large,the system is running in large flow and small temperature difference,and the energy consumption of the transmission and distribution system is great,and it has a high energy saving potential.From the result of single factor optimization,the operation state of the system can be improved by the frequency conversion of the pump,compared with the original system,the energy consumption of the 59.52% transmission and distribution system can be reduced,and the overall energy saving of the system is 37.37%.It is not effective to use high temperature cold water pre-cooling fresh air and supply air reheat technology.(4)During the operation of the original system,due to the low supply air temperature,the indoor thermal and humid environment stability and thermal comfort are poor.From the results of single factor optimization,the use of supply air reheat technology can improve the system’s stability of thermal and humid environment and thermal comfort.Unsatisfied hours and standard deviations of temperature and relative humidity during the entire construction period were the lowest.(5)The simulation results indicates that the integrated optimization scheme of the combination of pump frequency conversion,high-temperature cold water pre-cooling fresh air,and supply air reheating technology,compared with other THIC air-conditioning systems,the energy consumption of the integrated system is reduced by 47.36% compared to the original system,and the energy consumption is lower.At the same time,indoor thermal and humid environment stability and personnel comfort are relatively high.When the traditional split-type room air conditioner is used,the system energy consumption is lower than THIC air-conditioning system,but the indoor thermal environment is poor,especially the indoor wet environment is out of control,resulting in poor thermal comfort.(6)According to the annual cost of each program,in the respective operating years,the annual cost of split air conditioners is the lowest,and the integrated optimized THIC air-conditioning system is slightly lower than the split air-conditioning system.For the shortcomings of current air conditioning mode of residential buildings in areas with hot summer and cold winter,such as low energy efficiency ratio and poor indoor thermal comfort.From three aspects of energy consumption,comfort and economy,this paper analyzes the different schemes of THIC air conditioning system based on air source heat pump in summer conditions and provides reference for the system design and optimization of residential buildings in this region.