Study On Adaptability Of Dehumidification Mode For Photovoltaic Air Conditioning System In Extreme Hot And Humid Isolated Area

Low-latitude islands with high temperature and high humidity are far from inland and lack of energy,it is important to choose a suitable low-energy air treatment solution to match local heat and humidity load requirements.The conventional vapor compression air conditioning system uses a condensing and dehumidifying method to cool the air below the dew point temperature to achieve centralized treatment of sensible heat load and latent heat load and has the problems of high energy consumption and limited dehumidification capacity.The temperature and humidity independent control system has the characteristics of low energy consumption and independent treatment of heat and humidity load.The commonly used dehumidification methods in the system mainly include a solution dehumidification device and a rotary dehumidification device.Aiming at the demand for air treatment and energy situation in high temperature,high humidity and low latitude island reef area,this paper chooses air conditioning system suitable for this area to match different dehumidification devices,and discusses the applicability of different dehumidification devices in this area through numerical simulation and parameter matching calculation.The high temperature cold water air conditioning system driven by solar photovoltaic was used as the carrier to match the single-stage solution dehumidification device with total heat recovery and the two-stage runner dehumidification device with two-stage heat exchange.The regenerative heat source of dehumidifier is abundant local solar energy resources,and the condensation heat recovery is considered.The mathematical models of dehumidification module,photovoltaic power generation system,solar hot water collector system and high temperature chiller are established.Through MATLAB programming calculation,the system dynamic regeneration temperature,regenerative heat,dehumidification temperature and dehumidification system cooling capacity under different working conditions are obtained,and further matching calculation is performed to obtain parameters such as regenerative heat reduction rate,equipment scale and economy.By comparing and analyzing the calculation results of system operation matching under different outdoor moisture content,indoor moisture content and condensation temperature of refrigeration units,the applicability rules of dehumidification mode and regeneration mode in this area are obtained.The results show that the regenerative temperature,the dehumidification system of the rotor is higher than the dehumidification system of the solution,and the thermal quality demand gap between the two systems will further increase as the humidity of the working conditions increases.When the moisture content of outdoor air is higher than 20 g/kg(D),the regeneration temperature of the rotor dehumidification system will be higher than 100℃.Regenerating heat,the solution dehumidification system is higher than the rotor dehumidification system.The system cooling capacity,because the two systems handle the same heat and humidity load,and the dehumidification and cooling capacity of the wheel dehumidification system is higher,so that the total cooling capacity of the wheel dehumidification system is higher than the solution dehumidification system.When the condensing temperature of the high temperature chiller is lower than 40℃,the total area of the dehumidification system of the rotor is dominant;at 40~50℃,the solution dehumidification system is gradually superior to the rotor system from the high humidity zone;the condensation temperature Below 50℃,the solution dehumidification system is fully dominant.The initial investment of the equipment,when the condensation temperature is higher than 35℃,the initial investment of the solution dehumidification system is better than the dehumidification of the rotor.With the capacity of waste heat utilization,the liquid desiccant system has a good capacity of waste heat recovery.The regeneration heat of the liquid desiccant system can be fully weakened by a large flow of low temperature heat source with the temperature of 50~60℃.The average reduction rate can reach 34~58%.The heat recovery effect of the rotor dehumidification system is general,and the average reduction rate is about 15%.In this study,the matching calculation model of two kinds of photovoltaic-driven temperature and humidity independent dehumidification air conditioning systems is established,and the applicability law of dehumidification mode and rebirth mode in low latitude islands and reefs is obtained.The result can be solar energy under different heat and humidity conditions and different building loads.The dehumidification mode selection and the regenerative mode selection of the air conditioning system provide reference.