EP-4741735-A1 - CONTROL METHOD FOR HEAT PUMP SYSTEM, HEAT PUMP SYSTEM AND STORAGE MEDIUM

EP4741735A1EP 4741735 A1EP4741735 A1EP 4741735A1EP-4741735-A1

Abstract

The present application discloses a method for controlling a heat pump system, a heat pump system and a storage medium. The method includes: acquiring an energy storage temperature of an energy storage device; controlling the heat pump system to operate according to the energy storage temperature, so as to reach a corresponding target state; different target states correspond to different heat storage states of the energy storage device and/or different heating capacity of an indoor unit.

Inventors

WANG, FANG
XU, KE
LIU, Qunbo
LI, BIN
YANG, Qingcheng

Assignees

Midea Group Co., Ltd.
GD Midea Air-Conditioning Equipment Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240627

Claims (11)

A method for controlling a heat pump system, wherein the heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit; the refrigerant main circuit comprises an indoor unit, and the refrigerant branch circuit comprises an energy storage device; characterized in that the method for controlling the heat pump system comprises: acquiring an energy storage temperature of the energy storage device; and controlling an operation of the heat pump system according to the energy storage temperature to achieve a corresponding target state; wherein, different energy storage temperatures correspond to different target states, and in the different target states, the energy storage device remains in a heat storage state and the indoor unit has different heating capacities.
The method for controlling the heat pump system according to claim 1, wherein the target state comprises a first state or a second state; the controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding target state comprises: in response to that the energy storage temperature is less than a first preset temperature, controlling the heat pump system to operate to reach the first state; in response to that the energy storage temperature is greater than a second preset temperature, controlling the heat pump system to operate to reach the second state; and in response to that the energy storage temperature is greater than or equal to the first preset temperature, and the energy storage temperature is less than or equal to the second preset temperature, controlling the heat pump system to operate so as to maintain a current state of the heat pump system, wherein the current state is the first state or the second state; wherein, the first preset temperature is less than the second preset temperature; in the first state, the energy storage device is in the heat storage state and the heating capacity of the indoor unit is less than a preset value; in the second state, the energy storage device is in the heat storage state and the heating capacity of the indoor unit is greater than or equal to the preset value.
The method for controlling the heat pump system according to claim 2, wherein the in response to that the energy storage temperature is less than the first preset temperature, controlling the heat pump system to operate to reach the first state further comprises: controlling an electric heater to turn on to increase a heat storage capacity of the energy storage device.
The method for controlling the heat pump system according to claim 2, wherein the indoor unit comprises an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger; the controlling the heat pump system to operate to reach the first state comprises: controlling the first control valve to operate at an opening degree less than or equal to a preset opening degree; the controlling the heat pump system to operate to reach the second state comprises: controlling the first control valve to operate at an opening degree greater than the preset opening degree.
The method for controlling the heat pump system according to claim 4, wherein the refrigerant main circuit further comprises a compressor connected to the indoor unit; the controlling the first control valve to operate at the opening degree less than or equal to the preset opening degree further comprises: acquiring a current first high-side pressure of the heat pump system, and determining a first target high-side pressure corresponding to the heat pump system according to the energy storage temperature; determining a first target frequency of the compressor according to the first high-side pressure and the first target high-side pressure; and controlling the compressor to operate at the first target frequency.
The method for controlling the heat pump system according to claim 4, wherein the refrigerant main circuit further comprises a compressor connected to the indoor unit; the controlling the first control valve to operate at the opening degree greater than the preset opening degree further comprises: acquiring a current second high-side pressure of the heat pump system, and determining a second target high-side pressure corresponding to the heat pump system according to the energy storage temperature and an indoor temperature of an indoor space regulated by the indoor unit; determining a second target frequency of the compressor according to the second high-side pressure and the second target high-side pressure; and controlling the compressor to operate at the second target frequency.
The method for controlling the heat pump system according to claim 2, wherein the indoor unit further comprises an indoor fan corresponding to the indoor heat exchanger; the in response to that the energy storage temperature is less than the first preset temperature, controlling the heat pump system to operate to reach the first state further comprises: controlling the indoor fan to stop operating.
The method for controlling the heat pump system according to any one of claims 1 to 7, further comprising: in response to that the heat pump system starts a preset mode, performing the step of acquiring the energy storage temperature of the energy storage device; and in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.
The method for controlling the heat pump system according to any one of claims 1 to 7, wherein after the controlling the heat pump system to operate according to the energy storage temperature to reach the corresponding first state, the method further comprises: in response to that the heat pump system is in a preset mode, controlling the indoor unit to output a prompt message to prompt that an operating state of the heat pump system conflicts with the preset mode; wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.
A heat pump system, characterized by comprising: a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit; the refrigerant main circuit comprises an indoor unit, and the refrigerant branch circuit comprises an energy storage device; the control device comprises: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor; when the control program of the heat pump system is executed by the processor, steps of a method for controlling the heat pump system according to any one of claims 1 to 9 are implemented.
A storage medium, characterized in that a control program of a heat pump system is stored on the storage medium, and when the control program of the heat pump system is executed by a processor, steps of a method for controlling the heat pump system according to any one of claims 1 to 9 are implemented.

Description

The present application claims priority to Chinese Patent Applications No. 202310954065.9, filed on July 31, 2023, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of heat pumps, in particular to a method for controlling a heat pump system, a heat pump system, and a storage medium. BACKGROUND Many heat pump systems such as air conditioners are equipped with energy storage devices. In addition to being configured to regulate the indoor environment, the energy in the circulating refrigerant can also be stored in the energy storage device to meet other usage needs. Among them, the heat pump system needs to use heat both for indoor heating and for storing heat in the energy storage device. When the user has both indoor heating and heat storage needs, the operation of the heat pump system will prioritize satisfying one need according to the parameters configured by the user and then switch the operation mode to satisfy the other need. However, this is easy to cause the poor actual operating conditions of the heat pump system, resulting in insufficient heat provided by the system and low energy efficiency, and resulting in poor indoor heating and heat storage effects. SUMMARY TECHNICAL PROBLEM The main purpose of the present application is to provide a method for controlling a heat pump system, a heat pump system and a storage medium, aiming to improve the energy efficiency of the heat pump system and improve the balance between the indoor heating effect and the heat storage effect of the heat pump system. TECHNICAL SOLUTION To achieve the above purpose, the present application provides a method for controlling a heat pump system; the heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit; the refrigerant main circuit comprises an indoor unit, and the refrigerant branch circuit comprises an energy storage device; characterized in that the method for controlling the heat pump system comprises: acquiring an energy storage temperature of the energy storage device; andcontrolling an operation of the heat pump system according to the energy storage temperature to achieve a corresponding target state;different energy storage temperatures correspond to different target states, and in different target states, the energy storage device remains in a heat storage state and the indoor unit has different heating capacities. In an embodiment, the target state comprises a first state or a second state; the controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding target state comprises: in response to that the energy storage temperature is less than a first preset temperature, controlling the heat pump system to operate to reach the first state;in response to that the energy storage temperature is greater than a second preset temperature, controlling the heat pump system to operate to reach the second state; andin response to that the energy storage temperature is greater than or equal to the first preset temperature, and the energy storage temperature is less than or equal to the second preset temperature, controlling the heat pump system to operate so as to maintain a current state of the heat pump system, wherein the current state is the first state or the second state;the first preset temperature is less than the second preset temperature; in the first state, the energy storage device is in the heat storage state and the heating capacity of the indoor unit is less than a preset value; in the second state, the energy storage device is in the heat storage state and the heating capacity of the indoor unit is greater than or equal to the preset value. In an embodiment, the in response to that the energy storage temperature is less than the first preset temperature, controlling the heat pump system to operate to reach the first state further comprises: controlling an electric heater to turn on to increase a heat storage capacity of the energy storage device. In an embodiment, the indoor unit comprises an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger; the controlling the heat pump system to operate to reach the first state comprises: controlling the first control valve to operate at an opening degree less than or equal to a preset opening degree;the controlling the heat pump system to operate to reach the second state comprises: controlling the first control valve to operate at an opening degree greater than the preset opening degree. In an embodiment, the refrigerant main circuit further comprises a compressor connected to the indoor unit; the controlling the first control valve to operate at the opening degree less than or equal to the preset opening degree further comprises: acquiring a current first high-side pressure of the heat pump system, and det