Recovery of Waste Heat from Thermal Installations Using an Absorption Cooling Cycle

Abstract

Heat losses in industrial processes with combustion gases constitute a large proportion of wasted energy, which cannot be recovered by traditional methods of low energy level, where temperatures range between 70-250 ℃. In this research,Calculating an absorption refrigeration circuit that takes advantage of the waste heat with the combustion gases to cover the air-conditioning load, as the design was designed in two cases, the first of which is to start by calculating from the air-conditioning load required for a facility, and in the second case to start by calculating the heat energy that can be recovered from the combustion gases, where the use of the absorption refrigeration circuit is positively reflected Thermal installations in terms of increasing the efficiency of the boilers - reducing gas emissions - reducing electrical loads for air conditioning purposes. It was found through the study that for a facility with a cooling capacity of 100 kW, it is possible to recover heat from the combustion gases and save about thirty million pounds annually if we wanted to generate this energy from a steam power plant and thus reduce CO2 emissions by approximately 32 tons annually. The possibility of using this energy was studied To cover part of the cooling load of the facility, which is equal to 100kW through the absorption cooling circuit working on ammonia-water solution, the effect of working conditions from the temperature of the external medium, the load of the facility, the flow of gases, the exit temperature, and the condensation and evaporation temperatures of the ammonia-water solution was studied on each From the amount of gaseous emissions - generator load - condenser load - evaporator load - pump capacity - in order to determine all parameters affecting the work of the heat recovery system and thus determine the optimal working conditions