Heating system using heat pump and air heating device

Abstract

A heating system according to the present invention includes a heat pump provided to heat inflow air using a circulating refrigerant; an air heating device provided to heat air passing through the heat pump using water heated by burning a fuel, an external air temperature acquisition unit provided to acquire an external air temperature that is a temperature of external air, and a processor electrically connected to the heat pump, the air heating device, and the external air temperature acquisition unit. In a heating mode, when the external air temperature is greater than a lower limit and less than an upper limit of a balance band, which is a predetermined temperature range, the processor is configured to control the air heating device and the heat pump so that the air is heated by the air heating device and the heat pump.

1 . A heating system comprising:
 a heat pump provided to heat inflow air using a circulating refrigerant;   an air heating device provided to heat air passing through the heat pump using water heated by burning a fuel;   an external air temperature acquisition unit provided to acquire an external air temperature that is a temperature of external air; and   a processor electrically connected to the heat pump, the air heating device, and the external air temperature acquisition unit,   wherein, in a heating mode, when the external air temperature is greater than a lower limit and less than an upper limit of a balance band, which is a predetermined temperature range, the processor is configured to control the air heating device and the heat pump so that the air is heated by the air heating device and the heat pump.   
     
     
         2 . The heating system of  claim 1 , further comprising an inflow air temperature acquisition unit provided to acquire an inflow air temperature that is a temperature of air introduced into the heat pump and electrically connected to the processor,
 wherein, in the heating mode, when the external air temperature is greater than the lower limit and less than the upper limit of the balance band, which is the predetermined temperature range, the processor is configured to control the air heating device and the heat pump so that a load distribution is determined from a target heating load calculated based on the inflow air temperature and the external air temperature to allow the air heating device and the heat pump to operate according to the load distribution.   
     
     
         3 . The heating system of  claim 2 , wherein the load distribution determined from the target heating load is determined based on a primary energy coefficient of performance (PE-COP) value of the heat pump according to the external air temperature. 
     
     
         4 . The heating system of  claim 2 , wherein the load distribution determined from the target heating load is determined based on a fuel rate and an electricity rate used by the heat pump. 
     
     
         5 . The heating system of  claim 1 , wherein, in the heating mode, when the external air temperature is below the lower limit of the balance band, the processor is configured to control the air heating device and the heat pump so that the air is heated by the air heating device, and the heat pump does not operate, and
 in the heating mode, when the external air temperature is above the upper limit of the balance band, the processor is configured to control the air heating device and the heat pump so that the air is heated by the heat pump, and the air heating device does not operate.   
     
     
         6 . The heating system of  claim 1 , wherein, when the heat pump operates in a defrost operation mode, the processor is configured to control the air heating device so that the air heating device operates to heat air passing through the heat pump. 
     
     
         7 . The heating system of  claim 1 , wherein the air heating device is provided to further produce hot water by circulating water, and
 the heating system further comprises a waste heat recovery heat exchanger configured to exchange heat between the water circulating for the production of the hot water in the air heating device and the refrigerant circulating in the heat pump.   
     
     
         8 . The heating system of  claim 7 , wherein, when the hot water is produced by the air heating device, the processor is configured to control the heat pump so that an outdoor fan provided in the heat pump does not operate. 
     
     
         9 . The heating system of  claim 1 , wherein, in a dehumidifying mode, the processor is configured to control the heat pump and the air heating device so that the heat pump is configured to cool the inflow air, and the air heating device is configured to heat the air passing through the heat pump. 
     
     
         10 . The heating system of  claim 1 , wherein the air heating device comprises a furnace case, and
 the processor is disposed inside the furnace case.   
     
     
         11 . The heating system of  claim 1 , wherein the external air temperature acquisition unit is disposed at a furnace supply port provided so that the air heating device receives the external air. 
     
     
         12 . The heating system of  claim 1 , wherein the air heating device is disposed at a downstream side of the heat pump along an air flow direction. 
     
     
         13 . The heating system of  claim 1 , wherein the heat pump includes an indoor unit configured to transfer heat to the inflow air or absorb heat to the inflow air,
 wherein the indoor unit includes an indoor coil functioning as a condenser when the heating system performs the heating and functioning as an evaporator when the heating system performs the cooling.