Heat pump and method for controlling compressor based on operation of boiler

Patent metadata

Field	Value
Publication number	US-11619425-B2
Application number	US-202117162785-A
Country	US
Kind code	B2
Filing date	Jan 29, 2021
Priority date	Jan 30, 2020
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A heat pump may include a compressor configured to compress a refrigerant, a first temperature sensor provided in heating pipes connected to a heating device that heats an indoor space to sense a temperature of fluid flowing through the heating pipes, and a controller. The controller may be configured to determine whether a boiler is operating to heat an indoor space or is operating to supply hot water based on a sensing value of the first temperature sensor. The compressor may operate when the controller determines that the boiler is not operating to heat the indoor space and/or determines that the boiler is operating to supply hot water.

First claim

What is claimed is:

1. A heat pump, comprising:
a compressor configured to compress a refrigerant;
at least one heating pipe configured to connect to a heating device including a tube through which a fluid flows for heating an indoor space;
a first temperature sensor provided in the at least one heating pipe and configured to sense a fluid temperature of fluid flowing through the at least one heating pipe; and
a controller configured to:
calculate a rate of change of the fluid temperature of fluid flowing through the at least one heating pipe based on the fluid temperature sensed by the first temperature sensor;
determine whether a boiler is operating to heat the indoor space based on the calculated rate of change of the fluid temperature; and
control the compressor based on an operation of the boiler.

2. The heat pump of claim 1 , wherein the heating device is in communication with the heat pump via the at least one heating pipe.

3. The heat pump of claim 1 , wherein the boiler is in communication with the heat pump via the at least one heating pipe.

4. The heat pump of claim 1 , further comprising a second temperature sensor configured to sense an outdoor temperature, wherein when the outdoor temperature is sensed to be less than a predetermined temperature, the controller is configured to determine whether the boiler is operating to heat the indoor space and controls the compressor based on the fluid temperature sensed by the first temperature sensor.

5. The heat pump of claim 4 , wherein the controller is configured to control the compressor to stop operating when the outdoor temperature sensed by the second temperature sensor is less than the predetermined temperature, and control the compressor to operate when the outdoor temperature sensed by the second temperature sensor is higher than the predetermined temperature.

6. The heat pump of claim 5 , wherein, when the outdoor temperature is sensed to be less than the predetermined temperature, the controller is configured to calculate the rate of change of the fluid temperature based on a plurality of fluid temperatures sensed by the first temperature sensor.

7. The heat pump of claim 1 , wherein the controller is configured to determine that the boiler is not operating to heat the indoor space when the calculated rate of change of the fluid temperature is less than a first predetermined rate, and determine that the boiler is operating to heat the indoor space when the calculated rate of change of the fluid temperature exceeds a second predetermined rate that is greater than the first predetermined rate.

8. The heat pump of claim 1 , further comprising:
a first heat exchanger configured to exchange heat between the fluid and the refrigerant;
a hot fluid pipe through which fluid discharged from the first heat exchanger flows; and
a first valve provided between the at least one heating pipe and the hot fluid pipe, wherein the controller is configured to control the first valve to be closed to prevent a flow of fluid from the hot fluid pipe to the at least one heating pipe.

9. The heat pump of claim 8 , further comprising:
a cold fluid pipe through which fluid supplied to the first heat exchanger flows; and
a bypass pipe connecting the first valve and the cold fluid pipe, wherein the at least one heating pipe is connected to the first valve, and wherein the fluid discharged from the first heat exchanger and flowing through the hot fluid pipe flows through the bypass pipe when the first valve is closed.

10. The heat pump of claim 9 , wherein the at least one heating pipe includes a plurality of heating pipes respectively connected to the first valve and the boiler.

11. The heat pump of claim 10 , further comprising:
a second temperature sensor configured to sense an outdoor temperature, wherein when the outdoor temperature is sensed to be less than a predetermined temperature, the controller controls the compressor based on the fluid temperature sensed by the first temperature sensor;
a boiler recovery pipe through which fluid supplied to the boiler flows; and
a second valve provided in the boiler recovery pipe, wherein the controller is configured to control the second valve to be closed so that fluid is not supplied to the boiler when:
the outdoor temperature sensed by the second temperature sensor is higher than the predetermined temperature, or
the outdoor temperature sensed by the second temperature sensor is less than the predetermined temperature, and when the calculated rate of change of the fluid temperature sensed by the first temperature sensor is less than a first predetermined rate, indicating that the boiler is not operating to heat an indoor space.

12. The heat pump according to claim 11 , wherein:
the cold fluid pipe is connected to the heating device so that fluid discharged from the heating device flows through the cold fluid pipe; and
the boiler recovery pipe is connected to the cold fluid pipe.

13. A method of controlling a heat pump, the method comprising:
sensing via a first temperature sensor a fluid temperature of fluid flowing through at least one heating pipe;
calculating a rate of change of the fluid temperature of the fluid flowing through the at least one heating pipe based on the fluid temperature sensed by the first temperature sensor;
determining whether a boiler is operating to heat an indoor space based on the calculated rate of change of the fluid temperature; and
operating a compressor configured to compress a refrigerant based on an operation of the boiler, wherein the first temperature sensor is provided in the at least one heating pipe to sense the fluid temperature of fluid flowing through the at least one heating pipe, and wherein the at least one heating pipe is connected to a heating device including a tube through which a fluid flows for heating the indoor space.

14. The method of claim 13 , wherein the determining of whether the boiler is operating to heat the indoor space based on the fluid temperature sensed by the first temperature sensor is performed when a second temperature sensor configured to sense an outdoor temperature senses that the outdoor temperature value that is less than a predetermined temperature.

15. The method of claim 14 , further comprising:
stopping operation of the compressor when the outdoor temperature sensed by the second temperature sensor is less than the predetermined temperature; and
operating the compressor when the outdoor temperature sensed by the second temperature sensor is higher than the predetermined temperature.

16. The method of claim 13 , wherein the determining of whether the boiler is operating to heat the indoor space based on the calculated rate of change comprises:
determining that the boiler is not operating to heat the indoor space when the calculated rate of change is less than a first predetermined rate; and
determining that the boiler is operating to heat the indoor space when the calculated rate of change exceeds a second predetermined rate that is greater than the first reference rate.

17. A heating system, comprising:
a boiler having a combustion heating device to heat a first fluid and a first heat exchanger configured to exchange heat between the first fluid and a second fluid;
a dispenser configured to dispense the heated second fluid to a user; and
a heat pump including:
a compressor to compress a third fluid;
a temperature sensor provided in at least one heating pipe connected to the tube and configured to sense a temperature of the first fluid flowing through the at least one heatin

Assignees

• Lg Electronics Inc

Inventors

• Lee Youngmin
• Ryu Jihyeong
• Cho Eunjun

Classifications

• F24D3/18

  using heat pumps · CPC title

• F25B2313/0231

  with simultaneous cooling and heating · CPC title

• F25B33/00

  Boilers; Analysers; Rectifiers (boiler-absorbers F25B35/00) · CPC title

• F24D2220/042

  Temperature sensors · CPC title

• F25B49/022 Primary

  Compressor control arrangements · CPC title