Research On A Mix Of Semiconductor Refrigeration And Absorption Refrigeration For Intelligent Temperature Grain Storage

Food storage for a long time, it may occur naturally aging and have a bad effecton its nutritional value and quality, moldy foods may even be life-threatening. Andthe storage temperature, humidity may affect the speed of aging. With theimprovement of people’s living standards, we have growing concern of food safetyand food quality. So an intelligent grain storage that can adjust the temperature andhumidity in order to achieve the best quality storage will sell well.The main purpose of study is to research the mixed refrigerant of semiconductorrefrigeration and absorption refrigeration for the grain storage. Because thesemiconductor refrigeration need for cooling, absorption refrigeration need heat todrive cooling medium circulation, so they can work together to improve thecoefficient of performance (COP)In the first part, the method to calculate the cop and cooling capacity changingwith the current or size of semiconductor refrigeration is investigated. How tocalculate the heat loss is given. A structural model of the grain storage is establishedfor experiment.Then, the method to calculate the cop of absorption refrigeration and the enthalpyof ammonia is investigated, the program of calculating the cop is given. The reason ofcop changing with the ammonia concentration, charging pressure, environmenttemperature, inner temperature is discussed.After that, the mixing way of semiconductor refrigeration and absorptionrefrigeration is focused.Preheat method, cooling method, heating method threemixing methods are proposed. The preheat method is easy to refit. It has a2.7%reduction in energy consumption; Cooling method is the easiest to refit, needs fewermechanical parts, but cooling capacity decreased by14.1%, the overall efficiencydeclines. The heating method cooling capacity increased9.4%,44.8%reduction inpower consumption, is the best in energy saving, but it needs to refit the structure ofdiffusion absorption,it is the most complex, costly method. The Preheat method isfinished and the heating method is proved by Fluent.At last, the semiconductor refrigeration, absorption refrigeration and mixedrefrigerant are tested by experiment. The mathematical model is proved while theerror between theory and experiment is discussed. That provides a reference for mixed refrigerant designing and improving.