Study On The Solar Energy-Heat Pump Combined Drying Chinese Olive Preserve

Chinese olive preserves are main processing products of Chinese olive,The traditional methods for drying cause great depletion of energy and environmental pollution.In order to reduce the energy consumption in the process of Chinese olive preserves drying,and further development of industry,the solar energy-heat pump drying device is designed for Chinese olive preserves,according to the characteristics of olive preserves and the climatic environment in Fuzhou in the study.The matching design of solar collector and heat pump system is optimized.In order to provide scientific basis for energy conservation and environmental protection of Chinese olive preserves,the experiments on the production of Chinese olive preserves were carried out,and the technological and economic assessment was also carried out.The results are as follows:1.According to the production needs of enterprises,the design of drying capacity for the solar energy-heat pump combined drying device is 800kg each time,By computing the thermal load of the Chinese olive preserves drying experiment while solar energy collector and heat pump drying system operated alone,the area of solar energy collector,and the corresponding parts parameters for solar energy system and heat pump system are determined.The collector consists of 2 sets of 66 units,Effective area is 71.2 m2.There are 2 sets of electric auxiliary heater,and the power is 6kw of each;There are 2 sets of Solar fan,and the power is 0.5 kw of each.The parameters of heat pump dehumidification drying system:he refrigerating capacity of the dehumidifier is 17 kw,Dehumidification fan and heat pump fan all choose three speed axial fan,and the power is 0.6 kw and 0.3kw respectively.The power of the compressor for heat pump dehumidification is 4 kw.2.In the matching design of solar collector and heat pump system,conditions for the separate operation of solar drying systems and the matching operation conditions of solar collector and heat pump need to be identified.Based on the different heat supply calculation of collector under various time,the strength of radiation in Fuzhou area,the results are compared with that of each drying stage,the conditions of solar energy drying system operated alone are determined:Taking Jul、Aug、Sep as an example,the critical temperature rise values of the collector alone are 44℃ and 25℃.Under different ambient temperature conditions,comparing the different results of heat supply and energy consumption from heat pump or ambient,The optimal operation of solar collector and heat pump is determined;Taking Jul、Aug、Sep,as an example,when the ambient temperature is 25℃,and the ambient temperature is different from that of the collector,the temperature difference is 4℃.When the ambient temperature is 27℃,the temperature difference is 3℃.When the ambient temperature is 29℃/31℃/33℃,the temperature difference is 2℃.Then the hot air of the heat collector can be sent into the heat pump system.3.According to the above design,installation and commissioning of drying equipment,the solar energy heat pump combined drying experiments of Chinese olive preserves are carried out on September 14 and September 17,and the production performance of the equipment was verified,and economic assessment was also carried out.The results show that,the collector heat pump matching temperature is close to the theoretical value,the differences between 0.1℃ to 0.6℃.A technological and economic assessment on the solar energy-heat pump combined drying system was also carried out.The cost of sunny and cloudy is about 1/4 and 2/5 of traditional steam drying,the use of solar energy heat pump combined drying device has obvious energy saving effect.The drying device designed in this study is economically feasible.