| With the development of society, the energy consumption of China will continue to increase. Therefore, the strategy of giving priority to energy conservation is a long-term practice in China, and the key point of energy conservation is to decrease the energy consumption of building, industry and traffic. Heat-source tower duly extracts cold and heat source which heat pump needs from ambient air and it makes the best of air that is a renewable energy, which saves a lot of energy and cause no pollution to environment.Heat-source tower technology lacks a long history and currently the research of heat-source tower used in winter mainly concentrates on experimental stage. At the same time, the theoretical research of internal heat and mass transfer is scare and the application of heat-source tower mainly concentrates on civil air conditioning field in southern China. In order to make up the shortage of the theoretical research of internal heat and mass transfer in heat-source tower used in winter and expand the application fields of heat-source tower. This paper combines the finite volume method with three basic theory of cooling tower and develops the heat and mass model of counterflow wet-cooling heat-source tower. Then this paper applies the EES to calculate the results of the developed model and validates the accuracy of the model combining with the experimental data. In the end, the feasibility analysis of appling counterflow wet-cooling heat-source tower to industrial low temperature heat recovery field is carried out.Firstly, by reducing the assumptions, the paper improves the heat and mass transfer model of counterflow wet-cooling heat-source tower in summer (used as cooling tower). Experimental data are introduced to validate the model, and the error band between the simulation predicted value and experimental value is±5%. Meanwhile, starting from winter operating conditions, the paper develops the heat and mass transfer model of counterflow wet-cooling heat-source tower using water as working medium and develops it into the heat and mass transfer model using solution as working medium. Taking counterflow wet-cooling heat-source tower using water as working medium as example, the error band in winter is±10%during model validation, which can meet the needs of engineering calculation. Secondly, in the performance analysis of the counterflow wet-cooling heat-source tower using solution as working medium, the extraction of heat is increased when the inlet air temperature is increased, the inlet air flux is increased and the inlet solution flux is increased. But the extraction of heat is reduced when the inlet solution temperature is decreased. At the same time, the extraction of heat of counterflow wet-cooling heat-source tower using LiCl solution is higher than the counterflow wet-cooling heat-source tower using CaCl2solution. Therefore, when the inlet air temperature or the inlet air flux is lower, it can improve inlet solution flux, reduce inlet solution temperature and use solution with better effect, so that it can obtain more extraction of heat.In the end, waste heat of a return air shaft recovered by counterflow wet-cooling heat-source tower in a mine, the inlet fresh air temperature of intake shaft can be heated to over5℃in general weather conditions and it can be heated to over2℃in lowest outdoor air temperature conditions when the maximum heat is deducted. Therefore, low-temperature waste heat recovered by counterflow wet-cooling heat-source tower could satisfy the heat demand of the intake shaft corresponding to return air shaft. |
