Design and calculation method of heat collection side for combined heating system of solar and low temperature heat recovery air-source heat pump

Based on traditional solar heat pump system, proposes the construction mode of a new type of combined heating system. Aiming at the collector side design, establishes the calculation method for key parameters such as solar fraction, flow rate per unit area and so on. Focus on residential, commercial and office buildings, obtains the recommended values of solar fraction for these three types of buildings. Gets the optimal values of flow rate per unit area through experiments. The calculation and test results show that the solar fraction is related to thermal load characteristic of buildings, heating capacity of units and outdoor climate conditions, and the values of solar fraction are also remarkably different in three types of buildings. The value of solar fraction mainly relates to the highest temperature of heat storage tank.