OPTIMIZATION PROCESS OF DRYING FIRE HOSE COMBINED HEAT PUMP AND MICROWAVE BY RESPONSE SURFACE METHOD
In order to solve the problem of slow drying rate and high energy consumption when the fire hose is dried by heat pump,the combined drying method of heat pump and microwave is put forward.A heat pump microwave combined drying experimental platform was designed and built,and a single factor experiment was designed with the initial air supply temperature of the heat pump,the drying time of the heat pump and the microwave power as independent variables,so as to determine the influence range of each factor.On the basis of the single factor experiment,SMER,MER and ηen microwave energy utilization rate were taken as indicators.The Box-Behnken center combination experiment was designed and the response surface optimization analysis was carried out.The results show that the optimum process parameters of the combined heat pump microwave drying fire hose are as follows:initial air supply temperature is 42.3℃,heat pump drying time is 43.45 minutes and microwave power is 1.25 kW.Under these conditions,SMER is 0.658 kg/kWh,MER is 1.232 kg/h,and ηen is 63.7% .The experimental results are close to the predicted values of the model,and the relative errors are less than 4%,indicating that the optimization results are reliable.
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