A control system and control method for a heat pump air conditioner hot water mode

Abstract

The application discloses a control system and a control method of a heat pump air conditioner hot water mode, and the control system comprises an outdoor unit, at least one indoor unit, a domestic water tank and a floor heating module. The electric ball valve can adjust the opening proportion of the total air pipe of the outdoor unit according to different conditions, so that the domestic water tank is preferentially ensured to heat water during operation, the comfort degree of equipment use is improved, and energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to a control system and control method for a heat pump air conditioner hot water mode. Background Technology

[0002] Currently, when using air conditioning for cooling and heating, people also need to purchase water heaters and underfloor heating to meet their family's needs. Customers not only need to buy three sets of equipment but also need to install them three times, resulting in unnecessary waste of time and money. Therefore, multi-split air conditioners that integrate heating, cooling, underfloor heating, and hot water production have emerged on the market. These systems use a single outdoor unit to power the indoor unit, underfloor heating, and water tank simultaneously. However, these multi-split systems still have the following problems in actual use: 1. In summer, when only hot water is used, the main unit operates in heating mode, causing the high-temperature, high-pressure exhaust from the compressor to enter the indoor unit. Since the indoor unit does not need to heat at this time, this results in ineffective heat loss and ultimately unnecessary power consumption. 2. In winter, when temperatures drop below -15°C, if air conditioning, underfloor heating, and hot water production are used simultaneously, the hot water temperature may not be sufficient for showering. Increasing the capacity of the outdoor unit to solve this problem would significantly increase equipment costs. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a control system and method for a heat pump air conditioner hot water mode, effectively solving the problems mentioned in the background art.

[0004] The technical solution adopted in this invention is:

[0005] A control system for a heat pump air conditioner hot water mode includes an outdoor unit, at least one indoor unit, a domestic water tank, and a floor heating module. The gas inlet of the outdoor unit is connected to both the indoor unit and the floor heating module via a main conversion module. The liquid inlet of the outdoor unit is connected to the indoor unit, the domestic water tank, and the floor heating module respectively. The outdoor unit is connected to the domestic water tank via a third pipe at the inlet end of a four-way valve. A hot water conversion module is installed on the refrigerant pipeline of the domestic water tank. A condenser outlet electronic expansion valve is installed at the condenser outlet end of the outdoor unit.

[0006] Preferably, the overall conversion module includes a control board and an electric ball valve, and the hot water conversion module includes a control board, a hot water electronic expansion valve, and a water temperature sensor.

[0007] Meanwhile, the present invention also provides a control method for the hot water mode of a heat pump air conditioner, comprising the following steps:

[0008] 1) When the indoor unit and floor heating module are both off and the domestic water tank is open, close the electric ball valve at the gas pipe port of the outdoor unit. All the refrigerant produced by the outdoor unit will be sent to the domestic water tank for heat exchange. When the water temperature in the domestic water tank meets the set temperature, the outdoor unit will stop.

[0009] 2) When the local heating module is off, the indoor unit starts cooling, and the domestic water tank is open, if the indoor unit load accounts for 20% or less of the total capacity of the outdoor unit, the opening degree of the electronic expansion valve at the condenser outlet is controlled at 200 steps, and the opening degree of the electric ball valve is controlled at 480 steps. If the indoor unit load accounts for more than 20% of the total capacity of the outdoor unit, the opening degree of both the electronic expansion valve and the electric ball valve at the condenser outlet is controlled at 480 steps.

[0010] 3) When the local heating module is turned on, the indoor unit starts heating, and the domestic water tank is turned on, if the outdoor ambient temperature is greater than or equal to 0℃, the electric ball valve and the electronic expansion valve at the condenser outlet will be opened to their maximum opening. If the outdoor ambient temperature is lower than 0℃, low-temperature control will be implemented. The specific control method is as follows:

[0011] 3a) If conditions a1) through a5) are met simultaneously, the outdoor unit's compressor will operate at its highest frequency, the electric ball valve will open in 350 steps, and the indoor unit's fan speed will decrease by 5% until the domestic water tank temperature reaches the set temperature, at which point the low-temperature control will be exited. The electric ball valve and the condenser outlet electronic expansion valve will then open to their maximum opening.

[0012] a1) Outdoor ambient temperature ≥ -7℃;

[0013] a2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit;

[0014] a3) Indoor unit set temperature - current indoor temperature ≥ 5℃;

[0015] a4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0016] a5) The set temperature of the underfloor heating module - the current temperature of the underfloor heating module ≥ 5℃;

[0017] 3b) If b1) through b5) are satisfied simultaneously, the outdoor unit compressor will operate at its highest frequency, the electric ball valve will open in 240 steps, the indoor unit fan speed will decrease by 10%, and the low-temperature control will be exited when the domestic water tank temperature reaches the set temperature. The electric ball valve and the condenser outlet electronic expansion valve will then open to their maximum opening.

[0018] b1) -15 ≤ outdoor ambient temperature < -7℃;

[0019] b2) The operating load of the indoor unit + floor heating module accounts for ≥50% of the total capacity of the outdoor unit;

[0020] b3) The indoor unit set temperature - the current indoor temperature ≥ 5℃;

[0021] b4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0022] b5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency;

[0023] 3c) If c1) through c5) are satisfied simultaneously, the outdoor unit compressor will operate at the highest frequency, the electric ball valve will open in 200 steps, the indoor unit fan speed will decrease by 20%, until the domestic water tank temperature reaches the set temperature and exits low-temperature control. The electric ball valve and the condenser outlet electronic expansion valve will then open to their maximum opening.

[0024] c1) Outdoor ambient temperature < -15℃;

[0025] c2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit;

[0026] c3) The indoor unit set temperature - the current indoor temperature ≥ 5℃;

[0027] c4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0028] c5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency.

[0029] In summer, when only the domestic water tank is used for hot water, the electric ball valve on the main gas pipe is closed, allowing all the high-pressure gas generated by the outdoor unit to enter the domestic water tank through a third pipe to produce hot water. In winter, when the temperature is below zero and hot water, underfloor heating, and air conditioning are used simultaneously, the electric ball valve adjusts the opening ratio of the gas pipe and the heating capacity of the indoor unit to meet the needs of rapid hot water production. When the water temperature reaches the set temperature of the domestic water tank, the opening ratio of the electric ball valve and the capacity requirements of the indoor unit are adjusted again to meet the indoor heating capacity. In summer, when only one indoor unit is used, i.e., the indoor unit load accounts for 20% of the total capacity of the outdoor unit, and the domestic water tank is also turned on, the opening ratio of the electronic expansion valve at the condenser outlet of the outdoor unit is adjusted, allowing most of the high-pressure gas to enter the domestic water tank to produce hot water, while a small portion of the high-pressure gas enters the outer condenser for condensation. The condensed liquid refrigerant and the liquid refrigerant that exchanged heat with the domestic water tank enter the indoor unit for cooling.

[0030] This invention uses an electric ball valve to adjust the opening ratio of the outdoor unit's main gas pipe according to different conditions, thereby prioritizing the production of hot water from the domestic water tank during operation, improving the comfort of using the equipment, and reducing energy consumption. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Furthermore, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0039] like Figure 1 As shown, a control system for a heat pump air conditioner hot water mode includes an outdoor unit 1, at least one indoor unit 2, a domestic water tank 3, and a floor heating module 4. The gas port of the outdoor unit 1 is connected to both the indoor unit 2 and the floor heating module 4 through a main conversion module 5. The liquid port of the outdoor unit 1 is connected to the indoor unit 2, the domestic water tank 3, and the floor heating module 4 respectively. The inlet end of the outdoor unit 1 is connected to the domestic water tank 3 through a third pipe 7 at the inlet end of a four-way valve 6. A hot water conversion module 8 is provided on the refrigerant pipeline of the domestic water tank 3. A condenser outlet electronic expansion valve 9 is provided at the condenser outlet end of the outdoor unit 1.

[0040] The overall conversion module 5 includes a control board and an electric ball valve, and the hot water conversion module 8 includes a control board, a hot water electronic expansion valve, and a water temperature sensor.

[0041] A control method for a heat pump air conditioner hot water mode includes the following steps:

[0042] 1) When indoor unit 2 and floor heating module 4 are both off and domestic water tank 3 is on, close the electric ball valve of the gas pipe port of outdoor unit 1. All the refrigerant produced by outdoor unit 1 is sent to domestic water tank 3 for heat exchange. When the water temperature of domestic water tank 3 meets the set temperature, outdoor unit 1 stops.

[0043] 2) When the local heating module 4 is off, the indoor unit 2 is on for cooling, and the domestic water tank 3 is on, if the load of the indoor unit 2 accounts for 20% or less of the total capacity of the outdoor unit 1, the opening degree of the electronic expansion valve 9 at the condenser outlet is controlled to be 200 steps, and the opening degree of the electric ball valve is controlled to be 480 steps. If the load of the indoor unit 2 accounts for more than 20% of the total capacity of the outdoor unit 1, the opening degree of both the electronic expansion valve 9 at the condenser outlet and the electric ball valve is controlled to be 480 steps.

[0044] 3) When the local heating module 4 is turned on, the indoor unit 2 is turned on for heating, and the domestic water tank 3 is turned on, if the outdoor ambient temperature is greater than or equal to 0℃, the electric ball valve and the condenser outlet electronic expansion valve 9 will be opened to their maximum opening. If the outdoor ambient temperature is lower than 0℃, low temperature control will be implemented. The specific control method is as follows:

[0045] 3a) If conditions a1) through a5) are met simultaneously, the compressor of outdoor unit 1 will operate at the highest frequency, the electric ball valve will open to 350 steps, the fan speed of indoor unit 2 will decrease by 5%, until the temperature of domestic water tank 3 reaches the set temperature and exits low-temperature control, and the electric ball valve and condenser outlet electronic expansion valve 9 will open to their maximum opening.

[0046] a1) Outdoor ambient temperature ≥ -7℃;

[0047] a2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit;

[0048] a3) Indoor unit set temperature - current indoor temperature ≥ 5℃;

[0049] a4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0050] a5) The set temperature of the underfloor heating module - the current temperature of the underfloor heating module ≥ 5℃;

[0051] 3b) If b1)-b5) are satisfied simultaneously, the compressor of outdoor unit 1 will operate at the highest frequency, the electric ball valve will open to 240 steps, the fan speed of indoor unit 2 will decrease by 10%, until the temperature of domestic water tank 3 reaches the set temperature and exits low-temperature control, and the electric ball valve and condenser outlet electronic expansion valve 9 will open to their maximum opening.

[0052] b1) -15 ≤ outdoor ambient temperature < -7℃;

[0053] b2) The operating load of the indoor unit + floor heating module accounts for ≥50% of the total capacity of the outdoor unit;

[0054] b3) The indoor unit set temperature - the current indoor temperature ≥ 5℃;

[0055] b4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0056] b5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency;

[0057] 3c) If c1) through c5) are satisfied simultaneously, the compressor of outdoor unit 1 will operate at the highest frequency, the electric ball valve will open to 200 steps, the fan speed of indoor unit 2 will decrease by 20%, until the temperature of domestic water tank 3 reaches the set temperature and exits low-temperature control, and the electric ball valve and condenser outlet electronic expansion valve 9 will open to their maximum opening.

[0058] c1) Outdoor ambient temperature < -15℃;

[0059] c2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit;

[0060] c3) The indoor unit set temperature - the current indoor temperature ≥ 5℃;

[0061] c4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃;

[0062] c5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency.

[0063] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should be considered within the scope of protection of this invention.

Claims

1. A control method for a control system of a heat pump air conditioner in hot water mode, characterized in that, The control system includes an outdoor unit (1), at least one indoor unit (2), a domestic water tank (3), and a floor heating module (4). The gas port of the outdoor unit (1) is connected to both the indoor unit (2) and the floor heating module (4) through a main conversion module (5). The liquid port of the outdoor unit (1) is connected to the indoor unit (2), the domestic water tank (3), and the floor heating module (4) respectively. The outdoor unit (1) is connected to the domestic water tank (3) through a third pipe (7) at the inlet end of a four-way valve (6). A hot water conversion module (8) is provided on the refrigerant pipeline of the domestic water tank (3). A condenser outlet electronic expansion valve (9) is provided at the condenser outlet end of the outdoor unit (1). The main conversion module (5) includes a control board and an electric ball valve. The hot water conversion module (8) includes a control board, a hot water electronic expansion valve, and a water temperature sensor. The control method includes the following steps: 1) When the indoor unit (2) and the floor heating module (4) are both closed and the domestic water tank (3) is opened, close the electric ball valve of the gas pipe port of the outdoor unit (1). All the refrigerant generated by the outdoor unit (1) is sent into the domestic water tank (3) for heat exchange. When the water temperature of the domestic water tank (3) meets the set temperature, the outdoor unit (1) stops. 2) When the local heating module (4) is closed, the indoor unit (2) is turned on for cooling, and the domestic water tank (3) is turned on, if the load of the indoor unit (2) accounts for 20% or less of the total capacity of the outdoor unit (1), the opening degree of the electronic expansion valve (9) at the condenser outlet is controlled to be 200 steps, and the opening degree of the electric ball valve is controlled to be 480 steps. If the load of the indoor unit (2) accounts for more than 20% of the total capacity of the outdoor unit (1), the opening degree of the electronic expansion valve (9) at the condenser outlet and the electric ball valve are both controlled to be 480 steps. 3) When the local heating module (4) is turned on, the indoor unit (2) is turned on for heating, and the domestic water tank (3) is turned on, if the outdoor ambient temperature is greater than or equal to 0℃, the electric ball valve and the electronic expansion valve (9) at the condenser outlet will be opened to the maximum degree. If the outdoor ambient temperature is lower than 0℃, low temperature control will be implemented. The specific control method is as follows: 3a) If conditions a1)-a5) are met simultaneously, the compressor of the outdoor unit (1) will operate at the highest frequency, the electric ball valve will open to 350 steps, the fan speed of the indoor unit (2) will decrease by 5%, until the temperature of the domestic water tank (3) reaches the set temperature and exits the low temperature control. The electric ball valve and the condenser outlet electronic expansion valve (9) will open to the maximum opening. a1) Outdoor ambient temperature ≥ -7℃; a2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit; a3) Indoor unit set temperature - current indoor temperature ≥ 5℃; a4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃; a5) The set temperature of the underfloor heating module - the current temperature of the underfloor heating module ≥ 5℃; 3b) If b1)-b5) are satisfied simultaneously, the compressor of the outdoor unit (1) will operate at the highest frequency, the electric ball valve will open to 240 steps, the fan speed of the indoor unit (2) will decrease by 10%, until the temperature of the domestic water tank (3) reaches the set temperature and exits the low temperature control. The electric ball valve and the condenser outlet electronic expansion valve (9) will open to the maximum opening. b1) -15 ≤ outdoor ambient temperature < -7℃; b2) The operating load of the indoor unit + floor heating module accounts for ≥50% of the total capacity of the outdoor unit; b3) The indoor unit set temperature - the current indoor temperature ≥ 5℃; b4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃; b5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency; 3c) If c1)-c5) are satisfied simultaneously, the compressor of the outdoor unit (1) is controlled to run at the highest frequency, the opening degree of the electric ball valve is 200 steps, the wind speed of the indoor unit (2) is reduced by 20% until the temperature of the domestic water tank (3) reaches the set temperature and exits the low temperature control. The electric ball valve and the condenser outlet electronic expansion valve (9) are opened to the maximum opening degree: c1) Outdoor ambient temperature < -15℃; c2) The load of the indoor unit + floor heating module is ≥50% of the total capacity of the outdoor unit; c3) The indoor unit set temperature - the current indoor temperature ≥ 5℃; c4) Set temperature of domestic water tank - current temperature of domestic water tank ≥ 5℃; c5) The operating frequency of the outdoor unit's compressor is less than or equal to the maximum frequency.

Images