Double-source heat pump water machine water temperature control method and system

Abstract

The invention discloses a water temperature control method and system for a double-source heat pump water machine. The method comprises the steps that a control interval is set; obtaining a target temperature; and analyzing the target temperature and the control interval, and selecting a corresponding control strategy. Therefore, the control interval and the temperature node are set, and the control strategy is flexibly selected based on the target temperature of water supply, so that the air source heat pump and the PVT heat pump independently operate or cooperatively operate, different temperature requirements are flexibly met, multiple application scenes are adapted, and power consumption is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump control, and in particular to a dual-source heat pump water heater water temperature control method and system. BACKGROUND

[0002] Air source heat pumps are widely used in household hot water supply, but their heating efficiency is greatly affected by the outside environment temperature. In cold weather, the heating efficiency will decrease and the power consumption will increase. In addition, the water temperature demand of some water supply scenarios does not match the optimal efficiency interval of air source heat pumps. In low-temperature water supply scenarios, higher power is still needed, which is not energy efficient. In high-temperature water supply scenarios, the heating efficiency may be insufficient. It can be seen that the scheduling strategy of existing air source heat pumps lacks flexibility and cannot be well adapted to various application scenarios. SUMMARY

[0003] The first aspect of the embodiment discloses a dual-source heat pump water heater water temperature control method, which specifically includes: setting a control interval; obtaining a target temperature; analyzing the target temperature and the control interval to select a corresponding control strategy.

[0004] As an optional implementation, the control strategy is used to select a specific heat pump to run independently, or to select a number of heat pumps to run cooperatively.

[0005] As an optional implementation, the control interval includes a number of temperature nodes. Among them, the temperature nodes are used to distinguish different control strategies.

[0006] As an optional implementation, the number of temperature nodes is at least 2, so as to separate the control interval to form at least 3 control strategies indicating independent running or cooperative running.

[0007] As an optional implementation, the running parameters of each heat pump in the heat pump system are obtained. Based on the running parameters, the temperature nodes of the control interval and the control strategies between adjacent temperature nodes are set.

[0008] As an optional implementation, the setting of the control interval includes: Based on the current environment temperature and the output water temperature demand, the point of the temperature node in the control interval is adjusted.

[0009] As an optional implementation, the analysis of the target temperature and the control interval to select a corresponding control strategy includes: The temperature nodes include left and right nodes, and the value of the left node is lower than that of the right node. if the target temperature is lower than the left node, only enable air source heat pump to run alone; if the target temperature is higher than the left node and lower than the right node, enable air source heat pump to run in cooperation with PVT heat pump; if the target temperature is higher than the right node, enable the PVT heat pump to run alone.

[0010] The second aspect of the embodiment discloses a dual-source heat pump water machine water temperature control system, specifically comprising: air source heat pump and PVT heat pump, the air source heat pump is connected with a compressor; the compressor is connected with a water pump through a heat pump electromagnetic valve and a main electronic expansion valve; the PVT heat pump is connected with a PVT electromagnetic valve and a PVT three-way valve through a PVT water pump, the PVT three-way valve is connected with a PVT heat exchanger, the PVT heat exchanger is connected with the water pump through a PVT electromagnetic valve, a PVT electronic expansion valve and the main electronic expansion valve.

[0011] As an optional implementation, when the air source heat pump runs independently, the compressor, the heat pump electromagnetic valve and the main electronic expansion valve are enabled; when the air source heat pump and the PVT heat pump run in cooperation, the compressor, the heat pump electromagnetic valve, the PVT electromagnetic valve, the PVT electronic expansion valve and the main electronic expansion valve are enabled; when the PVT heat pump runs independently, the compressor, the PVT electromagnetic valve, the PVT electronic expansion valve and the main electronic expansion valve are enabled.

[0012] As an optional implementation, when the PVT heat pump runs independently, the PVT heat pump is powered off and stopped when a shutdown command is received, or when the water supply temperature is measured to be ≤ a specific temperature node for 120 consecutive seconds.

[0013] Compared with the prior art, the embodiment has the following beneficial effects: The control interval and temperature node are set, the control strategy is selected flexibly based on the target temperature of the water supply, the air source heat pump and the PVT heat pump are independently operated or cooperatively operated, different temperature requirements are flexibly responded to, various application scenarios are adapted, and power consumption is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiment, the drawings needed in the embodiment will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 is a working flow diagram of a water temperature control method of a dual-source heat pump water machine disclosed by the embodiment; Figure 2 is a system structure diagram of a water temperature control system of a dual-source heat pump water machine disclosed by the embodiment. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0017] Embodiment one Please refer to Figure 1 The water temperature control method of a dual-source heat pump water machine disclosed by the embodiment comprises: 101, setting a control interval.

[0018] In the embodiment, the control interval comprises a plurality of temperature nodes. Among them, the temperature nodes are used to distinguish different control strategies.

[0019] As an optional implementation, the number of temperature nodes is at least 2, so as to separate the control interval into at least 3 control strategies indicating independent operation or cooperative operation.

[0020] As an optional implementation, the running parameters of each heat pump in the heat pump system are obtained. Based on the running parameters, the temperature nodes of the control interval and the control strategies between adjacent temperature nodes are set.

[0021] Herein, taking a dual-source heat pump water machine as an example, it has 2 heat pumps, and by setting 2 temperature nodes, the control interval can be divided into 3 intervals, so that 1 heat pump independent operation, 2 heat pumps cooperative operation and another 1 heat pump independent operation can be set for the 3 intervals.

[0022] As can be seen, with the increase of temperature nodes, the intervals also increase, and the optional control strategies also increase.

[0023] As an optional implementation, setting the control interval comprises: Based on the current ambient temperature and the output water temperature demand, the point of the temperature node in the control interval is adjusted.

[0024] Specifically, the setting of the temperature node is related to the running efficiency and running power consumption of each heat pump, so it needs to be adjusted according to 102, Obtain a target temperature.

[0025] In this embodiment, the target temperature refers to the water temperature set by the user each time the terminal valve is opened, which can be set by the opening degree of the terminal valve.

[0026] 103, Analyze the target temperature and the control interval, and select the corresponding control strategy.

[0027] In this embodiment, the control strategy is used to select a specific heat pump to run independently, or to select a number of heat pumps to run cooperatively.

[0028] Here, the control strategy is set for each interval, so that when the target temperature falls into a specific interval, the corresponding control strategy can be selected to drive a specific heat pump to run independently, or to select a number of heat pumps to run cooperatively, achieving a diversified control mode.

[0029] In this embodiment, analyzing the target temperature and the control interval to select the corresponding control strategy includes: The temperature nodes include left and right nodes, and the value of the left node is lower than that of the right node; If the target temperature is lower than the left node, only the air source heat pump is enabled to run independently; If the target temperature is higher than the left node and lower than the right node, the air source heat pump and the PVT heat pump are enabled to run cooperatively; If the target temperature is higher than the right node, the PVT heat pump is enabled to run independently.

[0030] Here, taking a dual-source heat pump water machine with air source heat pump and PVT heat pump as an example, assuming that the left node is 15℃ and the right node is 30℃. When the target temperature is lower than 15℃, only the air source heat pump is enabled to run, achieving low-power heating. When the target temperature is higher than 15℃ and lower than 30℃, the air source heat pump and the PVT heat pump are enabled to run cooperatively. When the target temperature is higher than 30℃, the PVT heat pump is enabled to run independently, efficiently outputting high-temperature water to avoid situations such as insufficient air source heat pump efficiency leading to low water flow.

[0031] Compared with the prior art, the embodiment has the following beneficial effects: By setting the control interval and the temperature node, based on the target temperature of the water supply, the control strategy is flexibly selected to enable the air source heat pump and the PVT heat pump to run independently or cooperatively, flexibly cope with different temperature demands, adapt to various application scenarios, and effectively reduce power consumption.

[0032] Embodiment two Please refer to Figure 2 The dual-source heat pump water machine water temperature control system disclosed in this embodiment comprises: Air source heat pump and PVT heat pump, the air source heat pump is connected to the compressor; The compressor is connected to the water pump through the heat pump electromagnetic valve and the main electronic expansion valve; The PVT heat pump is connected to the PVT electromagnetic valve and the PVT three-way valve through the PVT water pump, the PVT three-way valve is connected to the PVT heat exchanger, and the PVT heat exchanger is connected to the water pump through the PVT electromagnetic valve, the PVT electronic expansion valve and the main electronic expansion valve.

[0033] In this embodiment, with the support of the pipeline composed of several valves, by respectively enabling specific valves, independent use of the air source heat pump or the PVT heat pump, and the cooperative operation of the two can be realized.

[0034] As an optional implementation, when the air source heat pump operates independently, the compressor, the heat pump electromagnetic valve and the main electronic expansion valve are enabled; When the air source heat pump and the PVT heat pump operate cooperatively, the compressor, the heat pump electromagnetic valve, the PVT electromagnetic valve, the PVT electronic expansion valve and the main electronic expansion valve are enabled; When the PVT heat pump operates independently, the compressor, the PVT electromagnetic valve, the PVT electronic expansion valve and the main electronic expansion valve are enabled.

[0035] As an optional implementation, when the PVT heat pump operates independently, the PVT heat pump is powered off and stopped when a shutdown command is received, or when the measured water supply temperature is less than or equal to a specific temperature node for 120 consecutive seconds.

[0036] Here, when it is measured that the hot water in the hot water tank is sufficient to supply, the PVT heat pump can be stopped accordingly, so as to reduce the overall power consumption as much as possible under the condition of efficient heating.

Claims

1. A dual-source heat pump water temperature control method, characterized in that: include: Set control intervals; Get the target temperature; Analyze the target temperature and the control range, and select a corresponding control strategy.

2. A dual-source heat pump water temperature control method according to claim 1, characterized in that: include: The control strategy is used to select a specific heat pump to operate independently, or to select several heat pumps to operate in coordination.

3. The water temperature control method of a dual-source heat pump water machine according to claim 1, characterized in that: include: The control interval includes several temperature nodes; Among them, the temperature node is used to distinguish different control strategies.

4. A dual-source heat pump water temperature control method according to claim 3, characterized in that: include: The number of the temperature nodes is at least 2, so as to separate the control intervals and form at least 3 control strategies indicating independent operation or coordinated operation.

5. The water temperature control method of a dual-source heat pump water machine according to claim 3, characterized in that: include: Obtaining operating parameters of each heat pump in the heat pump system; Based on the operating parameters, the temperature nodes of the control interval and the control strategies between adjacent temperature nodes are set.

6. A dual-source heat pump water temperature control method according to claim 5, characterized in that: The setting of the control interval includes: Based on the current ambient temperature and the output water temperature requirement, the points of the temperature nodes in the control range are adjusted.

7. A dual-source heat pump water temperature control method according to claim 4, characterized in that: The analyzing the target temperature and the control range and selecting a corresponding control strategy includes: The temperature node includes a left node and a right node, and the value of the left node is lower than the value of the right node; If the target temperature is lower than the left node, only the air source heat pump is enabled to operate alone; If the target temperature is higher than the left node and lower than the right node, the air source heat pump and the PVT heat pump are enabled to operate in coordination; If the target temperature is higher than the right node, the PVT heat pump is enabled to operate independently.

8. A dual-source heat pump water temperature control system, characterized in that: include: An air source heat pump and a PVT heat pump, wherein the air source heat pump is connected to a compressor; The compressor is connected to the water pump via the heat pump solenoid valve and the main electronic expansion valve; The PVT heat pump is connected to the PVT solenoid valve and the PVT three-way valve in sequence via the PVT water pump. The PVT three-way valve is connected to the PVT heat exchanger. The PVT heat exchanger is connected to the water pump via the PVT solenoid valve, the PVT electronic expansion valve and the main electronic expansion valve.

9. A dual-source heat pump water temperature control system according to claim 8, characterized in that: include: When the air source heat pump operates independently, the compressor, the heat pump solenoid valve and the main electronic expansion valve are activated; When the air source heat pump and the PVT heat pump operate in coordination, the compressor, the heat pump solenoid valve, the PVT solenoid valve, the PVT electronic expansion valve and the main electronic expansion valve are activated; When the PVT heat pump operates independently, the compressor, the PVT solenoid valve, the PVT electronic expansion valve and the main electronic expansion valve are activated.

10. A dual-source heat pump water temperature control system according to claim 9, characterized in that: include: When the PVT heat pump operates independently, upon receiving a shutdown command, or when the water supply temperature is measured to be ≤ a specific temperature node for 120 consecutive seconds, the PVT heat pump is powered off and shut down.

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