THREE-DIMENSIONAL TEMPERATURE FIELD SIMULATION OF LAKE IN THE APPLICATION OF OPEN-LOOP LAKE WATER HEAT PUMP

摘要

In this study, the possibility of using the lake around the architectural complex as heat source-sink is investigated combining the experience of a project in Nanjing. An initial analytical study of the open-loop lake water heat pump (LWHP) system has been carried out before the construction and some main problems from the feasibility analysis to the scheme determination process are taken into consideration. A three-dimensional mathematical model of the temperature field of the thermal discharge into the lake is developed and the temperature field is computed based on the model. Specially, the effect of the thermal diffusion caused by the different locations of the outfall is mainly researched when the lake-depth is uneven. Analysis conclusion: the feasibility of the water source heat pump applications is verified and some recommendations are provided to select a reasonable position of the outfall based on the simulation results; the thermal capacity of the lake and thermal diffusion of thermal discharge should be investigated as key indicators; it is shown that the uneven lake-depth makes more influence as to the the horizontal distribution than vertical direction , and the high temperature zone concentrates on a small area near the outfall, the outfall should be located at the deeper water area in some extent when the lake-depth is uneven. Hence, the present results give some references for achieving an optimal design.