Research On Performance Of Fire Hose Drying Equipment Based On Heat Pump With Heat Recovery

Fire control work is directly related to economic development,social stability,and people’s safety.Now the situation of fire control safety is still grim,and the fire hazards in high-rise buildings,underground Spaces,commercial complexes,towns,rural areas and other scenes are increasingly prominent.Fire hose is one of the necessary equipment for fire prevention and control.According to the national standard,the fire hose needs to be washed and dried after use and placed in a cool place.To reduce the workload of fire fighters,based on air source heat pump,a conventional closed device for drying fire hoses was designed,which can realize the drying and winding of two fire hoses at the same time.However,in the process of use,it was found that the return air temperature of the conventional closed heat pump drying device was high,and there were problems such as insufficient heat utilization and poor drying performance.In order to reduce the energy consumption of drying system and improve the drying efficiency,a fire hose drying device based on heat pump with heat recovery is designed in this paper.The main work is summarized as follows.(1)A heat pump drying device with heat recovery is designed.Heat pump system,circulation fan,heat recovery and other components of the design and selection.The control logic of the heat pump drying system with heat recovery is determined,and the inlet temperature of the drying chamber is taken as the control variable to realize the automatic start and stop of the heat pump.The assembly and debugging of the equipment are completed,and the temperature and humidity self-meter,pressure gauge and electrical meter are arranged inside the unit,which is convenient to record the test data.(2)The drying characteristic test of heat pump fire hose with heat recovery was completed.Through 6 groups of drying characteristics test,the results show that the higher the temperature,the faster the speed,the faster the drying rate.When the air supply temperature increased from 35 ℃ to 50 ℃,the drying time decreased by 18.8%,43.8% and 56.3%,respectively,with each increase of 5 ℃.Compared with the air supply speed of 2m/s,the drying time of 3m/s and 4m/s is reduced by 12.5% and 25%,respectively.Through the drying characteristic test,the drying model of fire hose was obtained by fitting the Wang and Singh model,which is convenient to predict the drying state of the sewer zone under different working conditions.Through the drying characteristic test,the drying model of fire hose was obtained by fitting Wang and Singh model,which is convenient to predict the dry state of the sewer zone under different conditions.(3)Complete the comparison test between the heat pump drying system with heat recovery and the conventional closed drying system.24 groups of test conditions were designed,and two operating modes,heat recovery and conventional closed,were adjusted through the pull-out duct structure.Experimental results show that,compared with the conventional closed drying system,the heat pump drying system with heat recovery can reach upper limit of the set supply air temperature faster,the start-stop cycle is shorter,the relative humidity at the entrance of the drying chamber is lower,and the drying rate is faster.In terms of heat pump performance,the use of heat recovery can save 12.5%～22.7% of compressor energy consumption and reduce 13.1%～26.4% of heat production.In terms of drying characteristics,compared with conventional closed drying system,the fan power of heat pump drying system with heat recovery is increased by 6.9%～9.6%,but the total energy consumption is reduced by 6.5%～18.1%,SMER by 6.9%～22.1% and MER by 7.1%～14.3%.(4)TRNSYS was used to build a simulation platform for heat pump drying system with heat recovery,and the operating parameters were optimized based on particle swarm optimization algorithm.Compared with the optimum test condition of the drying system with heat recovery,the optimized operating parameters can further reduce the energy consumption of the system by 5.8%～9.3%.Compared with the optimal test condition of conventional closed drying system,the three simulated conditions can achieve energy saving of 21.3%～24.2% and SMER increased by 15.4%～20.5%.