Solar auxiliary heating control method of air source heat pump water heater

Abstract

The invention discloses a solar auxiliary heating control method of an air source heat pump water heater, a water tank of the air source heat pump water heater can be heated through a solar heating system and a heat pump heating system, when a unit is started, a heat pump system operates according to system setting, and when the unit operates, the heat pump system operates according to system setting. The heat storage mode and the non-heat-storage mode are controlled respectively. According to the set water temperature, the difference value between the heat storage temperature and the actual water tank temperature and the difference value between the solar water outlet temperature and the actual water tank temperature, starting and stopping of the solar water pump are controlled, the purpose of auxiliary heating is achieved, in order to save more energy of the unit, the heat pump and the electric auxiliary heating device are immediately shut down as long as the solar water pump is started, and energy is saved. And if the solar water pump is closed, whether the heat pump and the electric auxiliary heater are started or not is automatically judged according to the current water tank temperature and related set parameters.

Description

Technical Field

[0001] The present invention relates to a solar-assisted heating control method for an air-source heat pump water heater. Background Art

[0002] Air-source heat pump technology is an efficient and clean energy technology, and air-source heat pump water heaters have been widely used. An air-source heat pump water heater uses a small amount of electrical energy to drive a compressor to operate, and through a heat exchange process, absorbs a large amount of heat energy from the environment to heat water. Although it is very energy-saving compared to traditional electric water heaters during the heating process, it still requires a small amount of electrical energy to drive. Therefore, it is necessary to combine air energy and solar energy in the water heater. When solar energy is sufficient, the water tank is preferentially heated by solar energy, and when solar energy is insufficient, the air energy is activated for heating. Summary of the Invention

[0003] In view of the above problems, the present invention provides a solar-assisted heating control method for an air-source heat pump water heater, effectively solving the problems pointed out in the background art.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A solar-assisted heating control method for an air-source heat pump water heater, the water tank of the air-source heat pump water heater can be heated by a solar heating system and a heat pump heating system, and the control method is as follows: When the unit is started, the heat pump system operates according to the system settings. When the unit is running, it is controlled separately according to different operating modes:

[0006] Heat storage mode:

[0007] If the unit meets all of the following conditions, control the solar water pump to turn on and the heat pump system to shut down:

[0008] 1), The solar water outlet temperature sensor is fault-free and the water tank temperature sensor is fault-free;

[0009] 2), T 水箱 <B–2;

[0010] 3), T 太阳能出水 -T 水箱 ≥C;

[0011] 4), T 太阳能出水 <D and lasts for 3S;

[0012] If the unit meets any one of the following conditions, control the solar water pump to turn off:

[0013] 1), The unit is shut down;

[0014] 2), The solar water outlet temperature sensor fails;

[0015] 3) The water tank temperature sensor is faulty;

[0016] 4) T 水箱 ≥B;

[0017] 5) T 太阳能出水 -T 水箱 ≤E;

[0018] 6) After the solar water pump has been turned on for 10 minutes, T 太阳能出水 drops by less than 1°C;

[0019] 7) T 太阳能出水 ≥F and lasts for 3 seconds;

[0020] Non - heat storage mode:

[0021] If the unit meets all of the following conditions, control the solar water pump to turn on and the heat pump system to shut down:

[0022] 1) The solar water outlet temperature sensor is not faulty and the water tank temperature sensor is not faulty;

[0023] 2) T 水箱 ≤T 设定 -A;

[0024] 3) T 太阳能出水 -T 水箱 ≥C;

[0025] 4) T 太阳能出水 <D and lasts for 3 seconds;

[0026] If the unit meets any one of the following conditions, control the solar water pump to turn off:

[0027] 1) The unit shuts down;

[0028] 2) The solar water outlet temperature sensor is faulty;

[0029] 3) The water tank temperature sensor is faulty;

[0030] 4) T 水箱 ≥T 设定 ;

[0031] 5) T 太阳能出水 -T 水箱 ≤E;

[0032] 6) After the solar water pump has been turned on for 10 minutes, T 太阳能出水 drops by less than 1°C;

[0033] 7) T 太阳能出水 ≥F and lasts for 3 seconds;

[0034] Among them, A is the start-stop temperature difference; B is the heat storage heating temperature; C is the solar energy start-up temperature difference; D is the solar energy maximum working temperature; E is the solar energy heat transfer coefficient; F is the solar energy maximum working temperature, T 水箱 is the water temperature in the water tank, T 太阳能出水 is the outlet water temperature of the solar heating system, T 设定 The heating temperature is set by the user.

[0035] The present invention controls the start and stop of the solar water pump according to the set water temperature, the difference between the heat storage temperature and the actual water tank temperature, and the difference between the solar water outlet temperature and the actual water tank temperature, so as to achieve the purpose of auxiliary heating. In order to save more energy for the unit, the present invention immediately turns off the heat pump and the electric auxiliary heating as long as the solar water pump is turned on, so as to make full use of solar energy heating. If the solar water pump is turned off, it is automatically determined whether the heat pump and the electric auxiliary heating are turned on according to the current water tank temperature and related set parameters.

[0036] The present invention has two working modes: heat storage mode and non-heat storage mode. In the heat storage mode, the heat storage temperature is used as the target temperature when the solar water pump is turned on. In the non-heat storage mode, the set temperature is used as the target temperature at any time. The heat storage temperature can be adjusted by the user and is usually higher than the set temperature, so that more hot water can be boiled and stored under the condition of sufficient solar energy for user use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Flowchart for solar powered water pumps to start;

[0038] Figure 2 Flow chart for solar water pump shutdown. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0046] Example 1

[0047] like Figure 1-2As shown in the figure, the present invention provides a solar-assisted heating control method for an air-source heat pump water heater. The water tank of the air-source heat pump water heater can be heated by a solar heating system and a heat pump heating system. The control method is as follows: When the unit is started, the heat pump system operates according to the system settings. When the unit is running, it is controlled separately according to different operating modes:

[0048] Heat storage mode:

[0049] If the unit meets all of the following conditions, control the solar water pump to turn on and the heat pump system to shut down:

[0050] 1) The solar water outlet temperature sensor is free of faults and the water tank temperature sensor is free of faults;

[0051] 2) T 水箱 <B–2;

[0052] 3) T 太阳能出水 -T 水箱 ≥C;

[0053] 4) T 太阳能出水 <D and lasts for 3S;

[0054] If the unit meets any one of the following conditions, control the solar water pump to turn off:

[0055] 1) The unit shuts down;

[0056] 2) The solar water outlet temperature sensor fails;

[0057] 3) The water tank temperature sensor fails;

[0058] 4) T 水箱 ≥B;

[0059] 5) T 太阳能出水 -T 水箱 ≤E. At this time, the solar water outlet temperature is close to the water tank temperature, and the heat exchange effect is poor. In order to ensure the heating effect of the water tank, turn off the solar heating and use the heat pump heating system for heating;

[0060] 6) After the solar water pump has been turned on for 10 minutes, if T 太阳能出水 drops by less than 1°C and the solar water outlet temperature does not drop, it means that the solar energy is insufficient and the heat exchange effect is poor. In order to ensure the heating effect of the water tank, turn off the solar heating and use the heat pump heating system for heating;

[0061] 7) T 太阳能出水 ≥F and lasts for 3S;

[0062] Non-heat storage mode:

[0063] If the unit meets all of the following conditions, control the solar water pump to start and the heat pump system to stop:

[0064] 1), The solar water outlet temperature sensor has no fault and the water tank temperature sensor has no fault;

[0065] 2), T 水箱 ≤T 设定 -A;

[0066] 3), T 太阳能出水 -T 水箱 ≥C;

[0067] 4), T 太阳能出水 <D and last for 3S;

[0068] If the unit meets any one of the following conditions, control the solar water pump to close:

[0069] 1), The unit is shut down;

[0070] 2), The solar water outlet temperature sensor fails;

[0071] 3), The water tank temperature sensor fails;

[0072] 4), T 水箱 ≥T 设定 ;

[0073] 5), T 太阳能出水 -T 水箱 ≤E, at this time, the solar water outlet temperature is close to the water tank temperature, and the heat exchange effect is poor. In order to ensure the water tank heating effect, turn off the solar heating and use the heat pump heating system for heating;

[0074] 6), After the solar water pump starts for 10 minutes, T 太阳能出水 drops less than 1°C, and the solar water outlet temperature does not drop, indicating that the solar energy is insufficient and the heat exchange effect is poor. In order to ensure the water tank heating effect, turn off the solar heating and use the heat pump heating system for heating;

[0075] 7), T 太阳能出水 ≥F and last for 3S. If the water temperature is too high, the water will change from liquid to gas, making heat exchange impossible. At the same time, in order to protect the solar water pump and prevent damage, the solar water pump should be turned off in time;

[0076] Among them, A is the start-stop temperature difference (user-adjustable parameter); B is the heat storage heating temperature (user-adjustable parameter); C is the solar start temperature difference (factory setting); D is the solar maximum working temperature (factory setting); E is the solar heat exchange coefficient (factory setting); F is the solar maximum working temperature (factory setting), T 水箱 is the water temperature in the water tank, T 太阳能出水 is the outlet temperature of the solar heating system, T设定 The heating temperature is set by the user.

[0077] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A solar auxiliary heating control method for an air source heat pump water heater, characterized in that: The control method is as follows: when the unit is turned on, the heat pump system operates according to the system settings, and when the unit is running, it is controlled separately according to different operating modes: Heat storage mode: If the unit meets all of the following conditions, the solar water pump will be turned on and the heat pump system will be shut down: 1) The solar water outlet temperature sensor and the water tank temperature sensor are both fault-free; 2)、T 水箱 <B–2; 3)、T 太阳能出水 -T 水箱 ≥C; 4), T 太阳能出水 <D and last for 3S; If the unit meets any of the following conditions, the solar water pump will be controlled to shut down: 1) The unit is shut down; 2) The solar water outlet temperature sensor is faulty; 3) Water tank temperature sensor failure; 4)、T 水箱 ≥B; 5)、T 太阳能出水 -T 水箱 ≤E; 6) After the solar water pump is turned on for 10 minutes, T 太阳能出水 The drop is less than 1℃; 7) T 太阳能出水 ≥F and lasts for 3S; Non-heat storage mode: If the unit meets all of the following conditions, the solar water pump will be turned on and the heat pump system will be shut down: 1) The solar water outlet temperature sensor and the water tank temperature sensor are both fault-free; 2)、T 水箱 ≤T 设定 -A; 3)、T 太阳能出水 -T 水箱 ≥C; 4), T 太阳能出水 <D and last for 3S; If the unit meets any of the following conditions, the solar water pump will be controlled to shut down: 1) The unit is shut down; 2) The solar water outlet temperature sensor is faulty; 3) Water tank temperature sensor failure; 4)、T 水箱 ≥T 设定 ; 5)、T 太阳能出水 -T 水箱 ≤E; 6) After the solar water pump is turned on for 10 minutes, T 太阳能出水 The drop is less than 1°C; 7) T 太阳能出水 ≥F and lasts for 3S; Among them, A is the start-stop temperature difference; B is the heat storage heating temperature; C is the solar energy start-up temperature difference; D is the solar energy maximum working temperature; E is the solar energy heat transfer coefficient; F is the solar energy maximum working temperature, T 水箱 is the water temperature in the water tank, T 太阳能出水 is the outlet water temperature of the solar heating system, T 设定 The heating temperature is set by the user.

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