Heating by air-source heat pump for cold climate in Chinese rural regions

Based on Chinese rural features, a heating way adopting an air-source heat pump (ASHP) for low cold climate that is a novel and pollution-free technique of energy utilization is proposed. The technique is feasible to replace the traditional heating way of dispersed coal combustion. The air-source heat pump is with a stable and reliable design of adding refrigerant for enthalpy increment. The results showed that under the simulated conditions of the evaporation temperature of -30 ℃, condensing temperature of 45 ℃, and ejecting refrigerant ratio of 0.6, its coefficient of performance (COP) is more than 2.25 and the energy efficiency ratio (EER) is more than 1.90 in theory. During its application in practice, the air-source heat pump could heat by warm air or water to meet with different needs. It is projected that about 386 million tons of carbon dioxide, 11.5 million tons of sulfur dioxide, 5.7 million tons of nitrogen oxide and 105 million tons of powder and dust could be decreased annually if the heat pumps are popularized in Chinese countryside. It can serve as an optimal scheme to phase out the traditional heating way in the countryside.