Paper No 716 – Performance test of a gas-fired absorption heat pump with total recovery of exhaust heat applied for distributed space heating – 14th IEA Heat Pump Conference, Chicago, USA
Under the background of carbon neutrality, efficient and low-carbon space heating in distributed areas away from the centralized network is a meaningful topic. In this paper, a gas-fired absorption heat pump was built and tested during winter in Langfang, a city near Beijing. The unit was driven by direct combustion of natural gas, and recovered low-grade heat from the ambient air. In order to increase the energy utilization ratio, solution preheating and intermediate evaporation wasintroduced. In order to enhance the internal heat recovery under low ambient temperatures, intermediate absorption was adopted. The measured performance showed that the outlet temperature of exhaust gas was lower than 35°C, indicating that both the sensible and latent heat were fully recovered. The average daily primary energy efficiency was over 1.58 and heating capacity was 30 kW, at the ambient temperature of -1.2°C, when supplying 45°C hot water for space heating. It was proven that the designed unit has great application potential in cold winter areas away from the centralized heating network