Heat pump system and control method therefor

Abstract

A heat pump system is provided. The heat pump system includes a compressor configured to compress a refrigerant, a refrigerant-water heat exchanger in which heat exchange occurs between the compressed refrigerant and water, an expansion valve configured to expand the refrigerant condensed in the refrigerant-water heat exchanger, an outdoor heat exchanger in which heat exchange occurs between the refrigerant expanded in the expansion valve and outdoor air, an outdoor fan arranged adjacent to the outdoor heat exchanger, a condensation temperature sensor configured to detect a temperature of the refrigerant condensed in the refrigerant-water heat exchanger, an incoming water temperature sensor configured to detect a temperature of water entering the refrigerant-water heat exchanger, an outgoing water temperature sensor configured to detect a temperature of water heat-exchange in the refrigerant-water heat exchanger and exiting, memory storing instructions, and one or more processors. The instructions, when executed by the one or more processors individually or collectively, cause the heat pump system to identify whether the refrigerant-water heat exchanger is in an abnormal state based on results of detecting by the condensation temperature sensor, the incoming water temperature sensor, and the outgoing water temperature sensor, and turn off the compressor and the outdoor fan based on the refrigerant-water heat exchanger being in the abnormal state, and turn on the compressor in a turned-off state of the outdoor fan.

What is claimed is: 
     
         1 . A heat pump system, comprising:
 a compressor configured to compress a refrigerant;   a refrigerant-water heat exchanger in which heat exchange occurs between the compressed refrigerant and water;   an expansion valve configured to expand the refrigerant condensed in the refrigerant-water heat exchanger;   an outdoor heat exchanger in which heat exchange occurs between the refrigerant expanded in the expansion valve and outdoor air;   an outdoor fan arranged adjacent to the outdoor heat exchanger;   a condensation temperature sensor configured to detect a temperature of the refrigerant condensed in the refrigerant-water heat exchanger;   an incoming water temperature sensor configured to detect a temperature of water entering the refrigerant-water heat exchanger;   an outgoing water temperature sensor configured to detect a temperature of water heat-exchange in the refrigerant-water heat exchanger and exiting;   memory storing instructions; and   one or more processors,   wherein the instructions, when executed by the one or more processors individually or collectively, cause the heat pump system to:
 identify whether the refrigerant-water heat exchanger is in an abnormal state based on results of detecting by the condensation temperature sensor, the incoming water temperature sensor, and the outgoing water temperature sensor, and 
 turn off the compressor and the outdoor fan based on the refrigerant-water heat exchanger being in the abnormal state, and turn on the compressor in a turned-off state of the outdoor fan. 
   
     
     
         2 . The heat pump system of  claim 1 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 identify that the refrigerant-water heat exchanger is operating normally in response to the detected temperature of the condensed refrigerant being higher than the temperature of the entering water and the detected temperature of the exiting water being higher than the detected temperature of the entering water.   
     
     
         3 . The heat pump system of  claim 2 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 control an opening level of the expansion valve to be equal to or greater than a first opening level based on the refrigerant-water heat exchanger being in the abnormal state.   
     
     
         4 . The heat pump system of  claim 3 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 identify whether the refrigerant-water heat exchanger is in the abnormal state based on results of detecting by the condensation temperature sensor, the incoming water temperature sensor, and the outgoing water temperature sensor after controlling the compressor, the outdoor fan, and the expansion valve.   
     
     
         5 . The heat pump system of  claim 4 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 identify whether the temperature detected by the condensation temperature sensor exceeds a predetermined temperature in response to the refrigerant-water heat exchanger being in the abnormal state.   
     
     
         6 . The heat pump system of  claim 5 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 upon identifying that the temperature detected by the condensation temperature sensor exceeds the predetermined temperature, control the outdoor fan to rotate at a rotational speed equal to or greater than a reference rotational speed and control the expansion valve to open at a second opening level or greater.   
     
     
         7 . The heat pump system of  claim 6 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 turn off the compressor and the outdoor fan in response to a predetermined time having elapsed after controlling the outdoor fan to rotate at the rotational speed equal to or greater than the reference rotational speed and control the expansion valve to open at the second opening level or greater.   
     
     
         8 . The heat pump system of  claim 4 , further comprising:
 a high pressure sensor configured to detect a pressure of the refrigerant compressed in the compressor,   wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 identify whether the pressure detected by the high pressure sensor exceeds a predetermined pressure in response to the refrigerant-water heat exchanger being in the abnormal state. 
   
     
     
         9 . The heat pump system of  claim 8 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 upon identifying that the pressure detected by the high pressure sensor exceeds the predetermined pressure, control the outdoor fan to rotate at a rotational speed equal to or greater than a reference rotational speed and control the expansion valve to open at a second opening level or greater.   
     
     
         10 . The heat pump system of  claim 9 , wherein the instructions, when executed by the one or more processors individually or collectively, further cause the heat pump system to:
 turn off the compressor and the outdoor fan in response to a predetermined time having elapsed after controlling the outdoor fan to rotate at the rotational speed equal to or greater than the reference rotational speed and control the expansion valve to open at the second opening level or greater.   
     
     
         11 . A method performed by a heat pump system, the method comprising:
 detecting a temperature of refrigerant condensed in a refrigerant-water heat exchanger;   detecting a temperature of water entering the refrigerant-water heat exchanger;   detecting a temperature of water heat-exchanged in the refrigerant-water heat exchanger;   identifying whether the refrigerant-water heat exchanger is in an abnormal state based on a result of detecting the temperatures;   turning off a compressor and an outdoor fan in response to identifying that the refrigerant-water heat exchanger is in the abnormal state; and   turning on the compressor while the outdoor fan is in a turned-off state.   
     
     
         12 . The method of  claim 11 , wherein the identifying of whether the refrigerant-water heat exchanger is in the abnormal state comprises:
 identifying that the refrigerant-water heat exchanger is operating normally in response to the detected temperature of the condensed refrigerant being higher than the temperature of the water entering the refrigerant-water heat exchanger and the detected temperature of the heat-exchanged water being higher than the detected temperature of the water entering the refrigerant-water heat exchanger.   
     
     
         13 . The method of  claim 12 , further comprising:
 controlling an opening level of an expansion valve, configured to expand the refrigerant condensed in the refrigerant-water heat exchanger, to be equal to or greater than a first opening level based on the refrigerant-water heat exchanger being in the abnormal state.   
     
     
         14 . The method of  claim 13 , further comprising:
 identifying whether the refrigerant-water heat exchanger is in the abnormal state based on results of detecting the temperatures after controlling the compressor, the outdoor fan, and the expansion valve.   
     
     
         15 . The method of  claim 14 , further comprising:
 identifying whether a temperature of the refrigerant condensed in the refrigerant-water heat exchanger detected by a condensation temperature sensor exceeds a predetermined temperature in response to the refrigerant-water heat exchanger being in the abnormal state.   
     
     
         16 . The method of  claim 15 , further comprising:
 upon identifying that the temperature detected by the condensation temperature sensor exceeds the predetermined temperature, controlling the outdoor fan to rotate at a rotational speed equal to or greater than a reference rotational speed and controlling the expansion valve to open at a second opening level or greater.   
     
     
         17 . The method of  claim 16 , further comprising:
 turning off the compressor and the outdoor fan in response to a predetermined time having elapsed after controlling the outdoor fan to rotate at the rotational speed equal to or greater than the reference rotational speed and controlling the expansion valve to open at the second opening level or greater.   
     
     
         18 . The method of  claim 14 , further comprising:
 identifying whether a pressure of the refrigerant compressed in the compressor detected by a high pressure sensor exceeds a predetermined pressure in response to the refrigerant-water heat exchanger being in the abnormal state.   
     
     
         19 . The method of  claim 18 , further comprising:
 upon identifying that the pressure detected by the high pressure sensor exceeds the predetermined pressure, controlling the outdoor fan to rotate at a rotational speed equal to or greater than a reference rotational speed and controlling the expansion valve to open at a second opening level or greater.   
     
     
         20 . The method of  claim 19 , further comprising:
 turning off the compressor and the outdoor fan in response to a predetermined time having elapsed after controlling the outdoor fan to rotate at the rotational speed equal to or greater than the reference rotational speed and controlling the expansion valve to open at the second opening level or greater.