High energy efficiency heat pump multi-connected system and control method thereof

Abstract

The application discloses a kind of high energy efficiency heat pump multi-connected system and its control method, multi-connected system includes outdoor unit, indoor unit and heat storage water tank, liquid pipe mouth is connected with the refrigerant pipeline of water tank by water tank refrigeration inlet pipe, the refrigerant pipeline of heat storage water tank is connected with the compressor injection port of outdoor unit by water tank refrigeration outlet pipe, electronic expansion valve EXV3 is equipped on water tank refrigeration inlet pipe, electric heating module is equipped in heat storage water tank, when heating mode is opened, electronic expansion valve EXV3 is opened according to initial opening degree, and electronic expansion valve EXV3 is controlled, while the electric heating module in heat storage water tank is controlled.The application is supplemented with heat storage water tank by electric heating module in valley electricity period, when multi-connected machine is operated, the heat stored in heat storage water tank is utilized, so not only can the heating effect of unit be improved, but also energy saving and consumption reduction can be realized.

Description

TECHNICAL FIELD

[0001] The application relates to a high-energy-efficiency heat pump multi-connected system and a control method thereof. BACKGROUND

[0002] At present, the heating effect of a multi-connected system is greatly attenuated in a low-temperature environment, and even if a host compressor is operated at the highest power, the indoor heating demand is difficult to meet, and the industry relies on indoor units to increase additional electric auxiliary heating to improve the heating capacity, and the multi-connected system means that each indoor unit needs to additionally increase electric auxiliary heating, thereby causing the room to be dry and uncomfortable, and most importantly, energy consumption is high. SUMMARY

[0003] In view of the above problems, the application provides a high-energy-efficiency heat pump multi-connected system and a control method thereof, which effectively solve the problems in the background art.

[0004] The technical scheme adopted by the application is as follows:

[0005] A high-energy-efficiency heat pump multi-connected system, comprising an outdoor unit, an indoor unit and a heat storage water tank, a water tank refrigeration inlet pipe between the indoor unit and the outdoor unit is connected with a refrigerant pipeline of the heat storage water tank, the refrigerant pipeline of the heat storage water tank is connected with a compressor injection port of the outdoor unit through a water tank refrigeration outlet pipe at the other end relative to the water tank refrigeration inlet pipe, an electronic expansion valve EXV3 is arranged on the water tank refrigeration inlet pipe, and an electric heating module is arranged in the heat storage water tank.

[0006] Preferably, a temperature sensor TH7 is arranged on the water tank refrigeration inlet pipe, and a temperature sensor TH8 is arranged on the water tank refrigeration outlet pipe.

[0007] A control method of a high-energy-efficiency heat pump multi-connected system, when a heating mode is started, the electronic expansion valve EXV3 is opened according to an initial opening degree, and the following control is performed on the electronic expansion valve EXV3:

[0008] If the temperature detected by the temperature sensor TH8 is greater than the temperature detected by the temperature sensor TH7+3 DEG C, the opening degree of the electronic expansion valve EXV3 is increased, the opening degree increase value is the temperature detected by the temperature sensor TH8-(the temperature detected by the temperature sensor TH7+3 DEG C), and the electronic expansion valve EXV3 is increased to the maximum opening degree; if the temperature detected by the temperature sensor TH8 is less than the temperature detected by the temperature sensor TH7+3 DEG C, the opening degree of the electronic expansion valve EXV3 is decreased, the opening degree decrease value is (the temperature detected by the temperature sensor TH7+3 DEG C)-the temperature detected by the temperature sensor TH8, and the electronic expansion valve EXV3 is decreased to the minimum opening degree; and if the temperature detected by the temperature sensor TH8 is equal to the temperature detected by the temperature sensor TH7+3 DEG C, the current opening degree of the electronic expansion valve EXV3 is maintained unchanged.

[0009] Meanwhile, the electric heating module in the heat storage water tank is controlled as follows:

[0010] If the current time is in the valley electricity period, the electric heating module is controlled to work to heat the water in the heat storage water tank; if the current time is in the peak electricity period, the electric heating module is controlled to stop.

[0011] By automatically controlling the opening degree of the electronic expansion valve EXV3, the refrigerant entering the compressor injection port of the outdoor unit has a higher temperature and the maximum flow, so as to improve the heating effect.

[0012] As preferred, the valley electricity period and the peak electricity period can be modified and set.

[0013] For different electricity environments, the valley electricity period and the peak electricity period can be modified and set, so as to realize personalized needs, for example, the valley electricity period and the peak electricity period can be modified and set according to the local low-price electricity, the valley electricity period can be modified and set according to the outdoor environment temperature to adjust the heating time of the electric heating module, and the heating time of the electric heating module is adjusted to the most appropriate state.

[0014] As preferred, the valley electricity period is from 22:00 every day to 08:00 the next day, and the peak electricity period is from 08:00 every day to 22:00 the same day.

[0015] The default valley electricity period and peak electricity period of the system at the time of factory shipment have been completed according to the current general time setting, so that the user does not need to set, and the complexity of the operation steps is avoided.

[0016] The application uses the electric heating module to supplement the heat of the heat storage water tank in the valley electricity period, and uses the heat stored in the heat storage water tank when the multi-split air conditioner is running, so as to not only improve the heating effect of the unit, but also save energy and reduce consumption.

[0017] Compared with the conventional multi-split air conditioner which sets electric auxiliary heating in each indoor unit, not only the problem of dry and uncomfortable room is solved, but also the energy consumption is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The system block diagram of the application. DETAILED DESCRIPTION

[0019] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, 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 belongs.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The application will be described in further detail below with reference to the drawings and specific embodiments. Embodiment

[0026] A high energy efficiency heat pump multi-connected system, comprising an outdoor unit, an indoor unit and a heat storage water tank, a liquid pipe port between the indoor unit and the outdoor unit is connected with a refrigeration inlet pipe of the water tank and a refrigerant pipeline of the heat storage water tank, the refrigerant pipeline of the heat storage water tank is connected with a compressor injection port of the outdoor unit through a refrigeration outlet pipe of the water tank at the other end relative to the refrigeration inlet pipe of the water tank, an electronic expansion valve EXV3 is arranged on the refrigeration inlet pipe of the water tank, and an electric heating module is arranged in the heat storage water tank.

[0027] A temperature sensor TH7 is arranged on the refrigeration inlet pipe of the water tank, and a temperature sensor TH8 is arranged on the refrigeration outlet pipe of the water tank.

[0028] The temperature difference of the refrigerant before and after heat exchange in the heat storage water tank is monitored by the temperature sensor TH7 and the temperature sensor TH8, so as to control the refrigerant flow in the heat storage water tank.

[0029] A control method of a high energy efficiency heat pump multi-connected system, when a heating mode is started, the electronic expansion valve EXV3 is opened according to an initial opening degree, and the following control is performed on the electronic expansion valve EXV3.

[0030] If the temperature detected by the temperature sensor TH8 is greater than the temperature detected by the temperature sensor TH7+3℃, the opening degree of the electronic expansion valve EXV3 is increased, the opening degree increase value is the temperature detected by the temperature sensor TH8-(the temperature detected by the temperature sensor TH7+3℃), until the electronic expansion valve EXV3 is increased to the maximum opening degree; if the temperature detected by the temperature sensor TH8 is less than the temperature detected by the temperature sensor TH7+3℃, the opening degree of the electronic expansion valve EXV3 is decreased, the opening degree decrease value is (the temperature detected by the temperature sensor TH7+3℃)-the temperature detected by the temperature sensor TH8, until the electronic expansion valve EXV3 is decreased to the minimum opening degree; if the temperature detected by the temperature sensor TH8 is equal to the temperature detected by the temperature sensor TH7+3℃, the current opening degree of the electronic expansion valve EXV3 is maintained unchanged.

[0031] Meanwhile, the electric heating module in the heat storage water tank is controlled as follows:

[0032] If the current time is in a valley electricity period, the electric heating module is controlled to work to heat the water in the heat storage water tank; if the current time is in a peak electricity period, the electric heating module is controlled to stop.

[0033] The valley electricity period and the peak electricity period can be modified and set.

[0034] The valley electricity time period is 22:00 to 08:00 of the next day, and the peak electricity time period is 08:00 to 22:00 of the same day.

[0035] The working principle of the present application is as follows:

[0036] The compressor of the outdoor unit produces high-temperature and high-pressure gaseous refrigerant which is sent to the indoor unit for heating, and the high-temperature and high-pressure gaseous refrigerant becomes medium-temperature and medium-pressure liquid refrigerant after heat exchange and enters the liquid pipe port, the medium-temperature and medium-pressure liquid refrigerant is divided into two ways at the liquid pipe port, one way passes through the main electronic expansion valve EXV2 throttling to enter the outdoor heat exchanger to absorb external heat, and then returns to the compressor for circulation, and the other way passes through the electronic expansion valve EXV3 to enter the heat storage water tank, the medium-temperature and medium-pressure liquid refrigerant absorbs the heat energy of the hot water in the heat storage water tank and then enters the injection port of the ejector for increasing enthalpy, so as to improve the superheat degree of the injection port, improve the heating capacity, and reduce the energy consumption.

[0037] The heat storage water tank uses the electric heating module to heat in the valley electricity time period, stores the heat in the water, stops the work of the electric heating module in the peak electricity time period, and uses the heat in the water to heat the refrigerant to improve the heat of the refrigerant entering the injection port of the ejector for increasing enthalpy, so as to not only achieve the purpose of energy saving and consumption reduction, but also improve the heating effect.

[0038] Finally, it should be noted that the above enumeration is only a specific embodiment of the present application. Obviously, the present application is not limited to the above embodiment, and there are many variations. All variations that can be directly derived or inferred from the disclosed content by those skilled in the art should be considered as the protection scope of the present application.

Claims

1. A control method for a high-efficiency heat pump multi-split system, characterized in that, The system includes an outdoor unit, an indoor unit, and a hot water storage tank. The liquid inlet of the indoor unit and the outdoor unit is connected to the refrigerant pipeline of the hot water storage tank via a refrigerant inlet pipe. The refrigerant pipeline of the hot water storage tank is connected to the compressor injection port of the outdoor unit via a refrigerant outlet pipe at the other end relative to the refrigerant inlet pipe. An electronic expansion valve EXV3 is installed on the refrigerant inlet pipe. An electric heating module is installed inside the hot water storage tank. A temperature sensor TH7 is installed on the refrigerant inlet pipe, and a temperature sensor TH8 is installed on the refrigerant outlet pipe. The control method is as follows: When the heating mode is activated, the electronic expansion valve EXV3 opens to its initial opening degree, and the electronic expansion valve EXV3 is controlled as follows: If the temperature detected by temperature sensor TH8 is greater than the temperature detected by temperature sensor TH7 + 3℃, then the electronic expansion valve EXV3 is controlled to increase its opening by the value of the temperature detected by temperature sensor TH8 minus (the temperature detected by temperature sensor TH7 + 3℃), until the electronic expansion valve EXV3 reaches its maximum opening. If the temperature detected by temperature sensor TH8 is less than the temperature detected by temperature sensor TH7 + 3℃, then the electronic expansion valve EXV3 is controlled to decrease its opening by the value of (the temperature detected by temperature sensor TH7 + 3℃) minus the temperature detected by temperature sensor TH8, until the electronic expansion valve EXV3 reaches its minimum opening. If the temperature detected by temperature sensor TH8 equals the temperature detected by temperature sensor TH7 + 3℃, then the electronic expansion valve EXV3 is controlled to maintain its current opening. Simultaneously, the electric heating module inside the hot water storage tank is controlled as follows: If the current time is during off-peak electricity hours, the heating module will be activated to heat the water in the hot water storage tank; if the current time is during peak electricity hours, the heating module will be deactivated.

2. The control method for a high-efficiency heat pump multi-split system according to claim 1, characterized in that, The valley electricity period and peak electricity period can be modified and set.

3. The control method for a high-efficiency heat pump multi-split system according to claim 1, characterized in that, The off-peak electricity period is from 22:00 to 08:00 the next day, and the peak electricity period is from 08:00 to 22:00 the same day.

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