The Simulation Analysis Of Double Compressor Double Condenser Heat Pump Drying System And Expermental Study On Heat Pump Drying

People aware of the importance of energy saving as energy crisis is grimmer. Drying is a high energy consumption unit operation and widely used in various fields of national economy. With the development of society and science technology, heat pump technology is gradually applied to drying field. Heat pump drying technology become an important energy-saving drying technology with its good energy saying and high product quality.In this paper, device is improved base on the traditional heat pump drying system and a new double compressor and double condenser heat pump drying system is proposed.The heat pump drying system can provide different condensation temperature and used for the different occasions that require the temperature of different heat source.Due to different condensing temperatures corresponding to different pressure, double compressors can reduce compression-power utilizing different compression ratio corresponding to a single compressor heat pump drying system. Analysis on double compressor double condenser heat pump drying system base on theoretical cycle, exploring the changes of the system various coefficients of performance by changing the operating parameters of condensating temperature tc1and condensating temperature tC2、evaporating temperation te、air mass flow L and export air temperature of the drying chamber and so on. COP reached3.0-4.2and SMER reached2.6-4.1kg/(kW·h) Within the given range of simulation data, energy-saving effect is obvious, through the analysis of various operating parameters, condensating temperature tc1and condensating temperature tc2are lower、evaporating temperation is higher and air mass flow is smaller will cause the temperature difference reducing between the evaporator import and export, the ineffective obvious heat of air pre-cooling will reduce, the effective cooling capacity of water condensating will increase, ERwill be higher.In this paper, a conventional heat pump drying system has been experimentally studied by changing the air flow, throttle opening and auxiliary electric heating temperature to obtain evaporating temperature,condensing temperature, compressor electric current under different conditions.The changs of COP, ER and m due to operating parameters are received by calculating and analyzing the experimental date. The experimental results show that,COP change obvious following evaporating temperature, condensing temperature and drying gas velocity. The highest COP is3.3when the evaporating temperature is45℃, the condensing temperature is85℃and the air speed is6m/s, The COP of the heat pump can reach2at the range30℃to45℃of evaporating temperature and the range70℃to80℃of condensing temperature.The minimum value ofis18.2%and the maximum value of ER is71.5%under evaporating temperature of23℃, condensing temperature of80℃and air mass flow of226kg/h. The influence of relative humidity on ER is stronger than the temperature of the evaporator import and export. m is mainly affected by the mass flow of the circulating air under the certain amount of dewatering of drying stage.Under the comparative analysis of experimental results and simulation results, the result trend between the analysis of double compressor and double condenser heat pump drying system and experimental result is the same, The value are bigger than experimental value.This paper proposed the idea of double compressor double condenser heat pump drying system. The simulation analysis and result of experimental study of the apparatu are some reference value to Further research and industrial applications of the apparatu, to further reduce the energy consumption of the heat pump drying apparatu.