Simulation Analysis Of Sewage Source Heat Pump Coupled With Solar Energy For Bathroom Hot-water System

The energy consumption for heating accounts for a large proportion in building energy consumption in China.With the coming of China's energy crisis,finding and utilizing appropriate new and clean renewable energy has become an important task in line with China's sustainable development goals.Sewage source heat pump is paid more and more attention because of its characteristics of energy saving and environmental protection,and solar energy because of its inexhaustible characteristics also need to be used.By coupling the sewage source heat pump with the solar energy to supply the hot water system of the bathroom,the low-grade thermal energy in the sewage can be utilized at the source of sewage generation to reduce the loss of thermal energy in the sewage transportation process.On the other hand,the problem of poor stability of a single solar heating water system can be avoided.At the same time,adding gas-fired boiler as supplementary heat source in the system can maintain the stability of heat demand.In this paper,a sewage source heat pump coupled solar energy hot water supply system for the bathroom is firstly constructed.According to the relevant design specifications and manuals,the equipment of the solar energy heat collection part of the system and the gas-fired boiler as a supplementary heat source are calculated and selected.At the same time,the model of sewage source heat pump unit is selected according to the sewage flow,and the control strategy of coupling system is analyzed.Taken TRNSYS simulation software as a platform to build a solar sewage-source heat pump coupling model for the bathroom hot water system,and the annual operating cycle of the system running situation has carried on the simulation,compared with the year each heat source of heat production transformation in the different months,verified the system solve the problem of solar energy poor stability and the possibility of low grade heat source using sewage.Selected the five kinds of solar collector area under each corresponding five heat storage water tank volume of 25 groups operating mode are analyzed,and studied the heat storage water tank size on the sewage-source heat pump coupling for bathroom hot water system solar energy consumption,and selected the five kinds of solar area the per square meter collector area corresponding to 90 litre heat storage water tank volume for the area under the optimal design scheme.By changing the heat collecting area of the solar collector,the effect of the heat collecting area on the energy consumption of the system is studied.The larger the heat collecting area of the solar collector is,the lower the total energy consumption of the system will be.Using static payback method,respectively,the optimal solution to the above five kinds of analysis was made on the economy,in the Beijing area is obtained when the bathroom use 8000 person,solar collectors collection hot area 3292.53 m~2,heat storage water tank volume is 296.33 m after system when the static payback period of the shortest,the static payback period is 4.76 years.Finally,the energy saving of the coupling system is analyzed,and the annual standard coal saving of the sewage source heat pump coupled solar energy system for bathroom hot water supply system can reach 261.27 tons,and the annual standard coal saving rate can reach 87.52%.