Structure and Performance of R744 Supercritical Heat Pump Water Boiler
Aiming at the problem of large power consumption of electric water boiler,the structure and performance of supercritical heat pump water boiler based on R744(carbon dioxide)were studied.For the high environment temperature above 25℃,the medium environment temperature of 5℃ to 25℃,and the low environment temperature of-25℃ to 5℃,the suitable structure and optimal operating parameters of R744 supercritical heat pump water boiler were given.A single-stage compression structure with a preheater was proposed for membership degree.It shows that when the environment temperature was higher than 25℃,the system could adopt a single-stage compression structure with a preheater,when the environment temperature was 5℃ to 25℃,the system could adopt a single-stage compression structure without a preheater,and when the environment temperature was lower than 5℃,the system could adopt a double-stage compression structure with an interstage cooler;the system of coefficient of performance and the heat transfer temperature difference distribution between the heat pump working fluid and the water in the heater were calculated and analyzed in different environment temperature.Systematic analysis was carried out based on the R744 supercritical high-temperature heat pump simulation software SCHPSim.The resault shows that when the environment temperature is 30,15 or-10℃,the power consumption is about 1.0∶4.1,1.0∶3.7,1.0∶2.0 of the electric water boiler in the corresponding structure of R744 supercritical heat pump water boiler situation,which had significant energy-saving advantages.The minimum heat transfer temperature difference between the R744 and the water in the heater is above 4℃,which can ensure a high heat transfer rate.
water boilerheat pumpsupercriticalR744 working fluidSCHPSim
国家科技期刊平台
NSTL
万方数据
