Conference Paper

Proceedings of ASim Conference 2012: 1st Asia conference of IBPSA-China, Japan, Korea

Potential capacity research on application of sewage-source heat pump system in bath centers

Zhang Weijie

Abstract: In bath centers，the most prominent characteristics is that great amount of hot water （35~60℃）is needed and consumed. At the same time, almost equal amount of warm water （30~35℃）is discharge directly to the drain (becoming to useless sewage). Great amount of low temperature thermal energy is included in the sewage. Sewage with this temperature has the great advantage and very suit for being as the low temperature heat source of heat pump systems. Thermal energy within the sewage should be fully utilized, otherwise, undue waste will be caused. Heat pump system has its superiority on high energy conversion performance, but it is often restricted by the existing of low temperature sources. Such as the utilization of air source heat pump systems has the worse energy conversion performance in severe cold area even in cold area. Warm sewage from bath centers provides a valuable low temperature heat source for heat pump systems which has no regional restriction. Even in severe cold area, bath center sewage can provide an abundant, advantage and stable low temperature heat source for room heating and water heating by water source heat pump systems. In this paper, a typical building of bath center is set, thermal (including air heating and water heating) end users are enumerated in detail. Amount of hot water and warm sewage, amount of thermal energy needed in hot water and included in sewage, building cooling load and condenser heat in summer, building heating load in winter etc. are counted up by calculation or simulation work. A unique independent sewage tank (for heat extraction) and a multiple purpose sewage source heat pump system (either for air heating or for water heating) are suggested and established. The whole research work is mainly based on simulation, such as building thermal load simulation (Energyplus software), characteristic simulation of the sewage source heat pump system (Transys software), optimal dimensions and thermal characteristic simulation of the sewage (thermal storage) tank, etc.. Based on the research work, an optimal analytical approach is presented, by this approach potential capacity and the optimal dimensions of the sewage tank for sewage heat pump systems can be obtained under the certain service allocation of the bath center. The optimal operation mode and the * Corresponding author email: zhangweijie_5@sina.com corresponding technical and economic analysis of the whole paradigm system have been also presented.
Pages: 251 - 258
Paper: