Paper No 250 – Performance study of a dual-loop booster heat pump in the deep recovery of boiler flue gas waste heat – 14th IEA Heat Pump Conference, Chicago, USA
Traditional district heating systems face disadvantages such as low utilization of renewable energy and high system heat loss, while ultra-low temperature district heating (ULTDH) systems can make full use of lowtemperature waste heat or renewable heat sources while reducing the heat loss of the pipe network. To deeply recover the low-temperature waste heat from the flue gas of a gas boiler in a heating project in Beijing, this paper designs a dual-loop booster heat pump system and uses it in the ULTDH system. The coefficient of performance (COP) and annual power consumption of the designed booster heat pump operating in the ULTDH system is simulated and analyzed using DeST software and actual compressor specifications. The results show that the average COP of the dual-loop booster heat pump is 0.92 higher than that of the conventional heat pump, which can save about 0.034 million kW·h of electrical energy during the heating period, and has a large energy-saving potential and broad market prospect.