Simulation And Analysis Of Solar Desiccant Air-conditioning Operating Characteristics In Hot Summer And Cold Winter Regions

The main contents of the study are based on the current status of energy and the environment,as well as air conditioning energy consumption account for a large proportion of energy consumption in buildings.Based on these current,it is of great significance to research and develop new air conditioning mode and discuss using new renewable energy to achieve architectural air conditioning.This paper analyses a novel hybrid dehumidification process air conditioning system of desiccant wheel combined with traditional heat pump technology in Nanjing.In order to reduce renewable energy consumption of the hybrid system,solar water heating system will be used for rotary dehumidifier regeneration to reduce the energy of the system.Office Buildings in Nanjing is studied.The combination of desiccant wheel technology and ground source heat pump technology is used in the construction of summer cooling and winter heating.In order to reduce the regeneration energy consumption of the composite system,we use the solar water heating system for the wheel regeneration.Annual dynamic load of building was simulated and analyzed by DesT.System equipment was selected according to simulation results,and relevant parameters are determined.Solar desiccant air-conditioning system model and conventional heat pump system model were established by TRNSYS.Energy consumption of each device system,heat pump performance and the heat can be provided by solar energy,also the performance of main components were simulated annual hourly.Operating results of system were analyzed.Simulatiing the indoor temperature and humidity by Airpak,and analysing the indoor comfort used solar desiccant air-conditioning system.Economic analysis of the municipal pipe network and these two systems running were completed.Feasibility of solar desiccant air-conditioning system applied in Nanjing area need to be explored.In terms of energy consumption,the annual energy consumption of solar desiccant air-conditioning system is 47427.25kWh,the ground source heat pump system annual energy consumption is 67209.07kWh.Solar desiccant air-conditioning system is relatively save 29.3%of energy consumption.In terms of running costs and energy efficiency,it has obvious advantages.Two systems have reached normal operating requirements in operating efficiency.The heat pump of solar desiccant air-conditioning system runs more stable than single ground source heat pump system,and the efficiency is higher.In terms of the renewable energy,the heat can be provided 69147.89MJ by solar energy,and can saving about 34%,compared with the desiccant air-conditioning of electricity as renewable energy.Desiccant wheel.the core component of the system can go dehumidifier about 0.114kg/kg every day in the humid summer,and the whole summer can reach 6.91kg/kg.The system uses the whole heat exchanger to carry on the pretreatment to he fresh air,then through the whole heat exchanger,the maximum humidity of fresh air can be reached to 0.0204kg/kg.Through the whole heat exchanger and the desiccant wheel can be realized the construction of the wet load in Nanjing,and then reduce the cooling energy of the heat pump systems,to achieve energy saving measures.In terms of comfort,operating solar desiccant air conditioning system,the winter and summer indoor temperature and humidity can meet the requirements,and comfort is good,the indoor temperature field and humdity field distribution is more uniform.Compared initial investment,the solar desiccant air-conditioning system is higher than the heat pump systems,but in the long run,the cost is lower.The solar desiccant air-conditioning system is greener.From the whole,the solar desiccant air-conditioning system is more feasible and long-term nature.