CN114353369A - Heat pump system - Google Patents
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- CN114353369A CN114353369A CN202111586175.1A CN202111586175A CN114353369A CN 114353369 A CN114353369 A CN 114353369A CN 202111586175 A CN202111586175 A CN 202111586175A CN 114353369 A CN114353369 A CN 114353369A
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Abstract
The application relates to the technical field of air temperature regulation, and discloses a heat pump system, including: the refrigerant circulating flow path comprises a compressor, a four-way valve, an air side heat exchanger, a water side heat exchanger and a gas-liquid separator; the liquid storage pipeline comprises a liquid storage device, a first pipeline and a second pipeline, one end of each of the first pipeline and the second pipeline is communicated with a liquid inlet of the liquid storage device, the other end of the first pipeline is communicated with a first refrigerant pipeline between the air side heat exchanger and the water side heat exchanger, and a first valve element is arranged on the first pipeline; the other end of the second pipeline is communicated with a second refrigerant pipeline between the four-way valve and the gas-liquid separator, and a second valve element is arranged on the second pipeline. The application provides a heat pump system with high energy efficiency.
Description
Technical Field
The present application relates to the field of air temperature conditioning technology, for example to a heat pump system.
Background
A heat pump is a device for transferring heat energy of a low-grade heat source to a high-grade heat source, and generally obtains low-grade heat energy from air, water or soil in the nature, and then provides high-grade heat energy which can be utilized for people, such as an air source heat pump system for obtaining a low-grade heat source from air.
The air source heat pump system comprises a refrigerant circulating flow path filled with refrigerant. When the heating mode is operated, the high-temperature refrigerant in the water side heat exchanger in the refrigerant circulating flow path transfers heat to water, and then water with higher temperature is provided for users, so that the requirements of the users for improving the indoor temperature and the like are met.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
at present, when a heat pump system operates in a heating mode, the quantity of refrigerants filled in a refrigerant circulation flow path is fixed, and if the quantity of the refrigerants is adjusted according to a fixed-point working condition, the phenomenon that a heat exchanger on the other side of the heat pump system lacks refrigerants or a large quantity of refrigerants occurs under a relatively extreme working condition, so that the heat pump system cannot exert the optimal performance.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a heat pump system, which adjusts the amount of refrigerant participating in a refrigerant circulation flow path by arranging a liquid storage pipeline, so that the heat pump system can exert the optimal energy efficiency under different working conditions.
In some embodiments, a heat pump system comprises: the refrigerant circulating flow path comprises a compressor, a four-way valve, an air side heat exchanger, a water side heat exchanger and a gas-liquid separator; the liquid storage pipeline comprises a liquid storage device, a first pipeline and a second pipeline, one end of each of the first pipeline and the second pipeline is communicated with a liquid inlet of the liquid storage device, the other end of the first pipeline is communicated with a first refrigerant pipeline between the air side heat exchanger and the water side heat exchanger, and a first valve element is arranged on the first pipeline; the other end of the second pipeline is communicated with a second refrigerant pipeline between the four-way valve and the gas-liquid separator, and a second valve element is arranged on the second pipeline.
Optionally, a throttling element is further disposed on the second pipeline.
Optionally, the first valve body element comprises a first solenoid valve; and/or the second valve element comprises a second solenoid valve.
Optionally, the throttling element comprises a capillary tube.
Optionally, the heat pump system further comprises: the first controller is configured to judge whether the condensation pressure of the water side heat exchanger and the first exhaust temperature of the compressor meet preset conditions according to the outlet water temperature of the water side heat exchanger, and then control the opening or closing of the first valve body element and/or the second valve body element.
Optionally, the determining, according to the outlet water temperature of the water-side heat exchanger, whether the condensing pressure of the water-side heat exchanger and the first exhaust temperature of the compressor satisfy a preset condition, and then controlling the opening or closing of the first valve element and/or the second valve element includes: if the difference value between the outlet water temperature and the first temperature threshold value is a positive value, and the difference value is greater than or equal to the first difference value threshold value, acquiring the condensation pressure and the first exhaust temperature; if the condensing pressure is greater than or equal to a first condensing pressure threshold value and the first exhaust temperature is greater than or equal to a first exhaust temperature threshold value, controlling the first valve element to be closed, and simultaneously controlling the second valve element to be opened for a first preset time period, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline; or if the difference value between the effluent temperature and the first temperature threshold value is a negative value and the absolute value of the difference value is greater than or equal to a second difference value threshold value, acquiring the condensation pressure and the first exhaust temperature; and if the condensation pressure is less than or equal to a second condensation pressure threshold value and the first exhaust temperature is less than or equal to a second exhaust temperature threshold value, controlling the second valve element to be closed, and simultaneously controlling the first valve element to be opened for a second preset time period, so that part of the refrigerant in the refrigerant circulation flow path enters the liquid storage device through the first pipeline.
Optionally, the first controller is further configured to control the compressor to operate at a highest frequency.
Optionally, the heat pump system further comprises: and the second controller is configured to judge whether the evaporation pressure of the air side heat exchanger and the second exhaust temperature of the compressor meet preset conditions according to the ambient temperature of the air side heat exchanger, and further control the opening or closing of the first valve body element and/or the second valve body element.
Optionally, the determining, according to the ambient temperature of the air-side heat exchanger, whether the evaporation pressure of the air-side heat exchanger and the second exhaust temperature of the compressor satisfy a preset condition, and then controlling the opening or closing of the first valve element and/or the second valve element includes: if the difference value between the ambient temperature and the third temperature threshold is a negative value and the absolute value of the difference value is greater than or equal to the third difference threshold, acquiring the evaporation pressure and a second exhaust temperature; if the evaporation pressure is less than or equal to a first evaporation pressure threshold value and the second exhaust temperature is greater than or equal to a third exhaust temperature threshold value, controlling the first valve element to close, and simultaneously controlling the second valve element to open for a third preset time period, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline; or if the difference between the ambient temperature and the fourth temperature threshold is a positive value and the difference is greater than or equal to the fourth difference threshold, acquiring the evaporation pressure and the second exhaust temperature; and if the evaporation pressure is greater than or equal to a second evaporation pressure threshold value and the second exhaust temperature is less than or equal to a fourth exhaust temperature threshold value, controlling the second valve element to close, and simultaneously controlling the first valve element to open for a fourth preset time period, so that part of the refrigerant in the refrigerant circulation flow path enters the liquid storage device through the first pipeline.
Optionally, the second controller is further configured to control the compressor to operate at a highest frequency.
The heat pump system provided by the embodiment of the disclosure can realize the following technical effects:
the heat pump system provided by the embodiment of the disclosure comprises a refrigerant circulation pipeline and a liquid storage pipeline. The liquid storage pipeline comprises a liquid storage device, a first pipeline and a second pipeline, wherein the first pipeline and the second pipeline are communicated with a liquid inlet of the liquid storage device. The other end of the first pipeline is communicated with a first refrigerant pipeline between the air side heat exchanger and the water side heat exchanger, and the other end of the second pipeline is communicated with a second refrigerant pipeline between the four-way valve and the gas-liquid separator. And, be provided with first valve body component on the first pipeline, be provided with second valve body component on the second pipeline.
When the heat pump system operates in a heating mode and operates under the working condition of low water outlet temperature or high environment temperature, the first valve element can be opened, the second valve element can be closed, and part of refrigerant in the refrigerant circulating flow path is stored in the liquid storage device through the first pipeline, so that the amount of the refrigerant participating in the refrigerant circulating flow path is reduced. At the moment, the compressor can still be controlled to run at the highest frequency, and the energy efficiency of the heat pump system under the low-running working condition is improved.
When the heat pump system operates in a heating mode and operates under the working condition that the outlet water temperature is higher or the environment temperature is lower, the second valve element can be opened, the first valve element is closed, the refrigerant stored in the liquid storage device is released into the refrigerant circulation flow path, and the amount of the refrigerant participating in the refrigerant circulation flow path is increased. At the moment, the compressor can still be controlled to run at the highest frequency, and the energy efficiency of the heat pump system under the high-running working condition is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic flow path diagram of a heat pump system provided by an embodiment of the present disclosure;
FIG. 2 is a schematic flow path diagram of a reservoir line of a heat pump system provided by an embodiment of the present disclosure;
fig. 3 is a control flowchart of a first control portion of the heat pump system according to the embodiment of the present disclosure;
fig. 4 is a control flowchart of a second control portion of the heat pump system provided in the embodiment of the present disclosure;
fig. 5 is a control flowchart of a third control portion of the heat pump system according to the embodiment of the present disclosure;
fig. 6 is a schematic diagram of a heat pump system provided by an embodiment of the present disclosure.
Reference numerals:
1: a compressor; 2: a four-way valve; 3: an air-side heat exchanger; 4: a water side heat exchanger; 5: a gas-liquid separator; 7: a refrigerant circulation flow path throttling element;
6: a liquid storage device; 61: a first pipeline; 611: a first solenoid valve; 62: a second pipeline; 621: a second solenoid valve; 622: a capillary tube; 623: a throttle valve.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
The embodiment of the disclosure provides a heat pump system, which comprises a refrigerant circulating flow path and a liquid storage pipeline. The refrigerant circulation path includes a compressor 1, a four-way valve 2, an air-side heat exchanger 3, a water-side heat exchanger 4, and a gas-liquid separator 5. The liquid storage pipeline comprises a liquid storage device 6, a first pipeline 61 and a second pipeline 62, and one ends of the first pipeline 61 and the second pipeline 62 are communicated with a liquid inlet of the liquid storage device 6. The other end of the first pipeline 61 is communicated with a first refrigerant pipeline between the air side heat exchanger 3 and the water side heat exchanger 4, and a first valve element is arranged on the first pipeline 61; the other end of the second pipeline 62 is communicated with a second refrigerant pipeline between the four-way valve 2 and the gas-liquid separator 5, and a second valve element is arranged on the second pipeline 62.
As shown in fig. 1, the heat pump system provided by the embodiment of the present disclosure includes a compressor 1, a four-way valve 2, an air-side heat exchanger 3, and a water-side heat exchanger 4, which are sequentially communicated. The heat pump system is provided with a liquid storage pipeline.
When the air source heat pump system operates in the heating mode, the air side heat exchanger 3 can also be called an evaporator, and the water side heat exchanger 4 can also be called a condenser. With the change of the ambient temperature at the evaporator side, the evaporation pressure of the refrigerant in the evaporator changes to cause different densities of the refrigerant, so that the refrigerant quantity required by the heat pump system in heating is different at different ambient temperatures. That is, the lower the ambient temperature is, the more refrigerant amount is required for the heat pump system. With the change of the outlet water temperature of the condenser side, the condensing pressure change in the condenser causes different density of the refrigerant, so that the refrigerant quantity required by the heat pump system in heating is different under different outlet water temperatures. Namely, the higher the outlet water temperature is, the more refrigerant quantity is required by the heat pump system.
The heat pump system provided by the embodiment of the disclosure is provided with a liquid storage pipeline. The liquid storage pipeline can temporarily store or timely supplement the refrigerant in the refrigerant circulating flow path under different working conditions according to the operation heating mode of the heat pump system, so that the heat pump system can exert the optimal energy efficiency under different working conditions.
The reservoir line includes a reservoir 6, a first line 61 and a second line 62. The liquid storage device 6 can be a tank body capable of storing refrigerant, such as a liquid storage tank. Alternatively, the liquid storage device 6 is a tank structure having only one liquid inlet. One end of each of the first pipeline 61 and the second pipeline 62 is communicated with a liquid inlet of the liquid storage device 6. Alternatively, one end of the first pipe 61 is directly communicated with the liquid inlet of the liquid storage device 6, and the second pipe 62 is branched from the branched portion of the first pipe 61, as shown in fig. 1 and 2.
Optionally, the other end of the first pipeline 61 is communicated with a first refrigerant pipeline between the air-side heat exchanger 3 and the water-side heat exchanger 4, and a first valve element is arranged on the first pipeline 61. The other end of the second pipeline 62 is communicated with a second refrigerant pipeline between the four-way valve 2 and the gas-liquid separator 5, and a second valve element is arranged on the second pipeline 62.
When the heat pump system operates under the working condition that the outlet water temperature of the water side heat exchanger 4 side is higher or the environment temperature of the air side heat exchanger 3 side is lower, a high-pressure liquid refrigerant is stored in the liquid storage device 6, and the other end of the second pipeline 62 is connected with the gas-liquid separator 5, so that the low-pressure state is achieved. The second valve element provided on the second pipe 62 is controlled to be opened, and the first valve element provided on the first pipe 61 is controlled to be closed. The high-pressure liquid refrigerant flows to the gas-liquid separator 5 through the second pipeline 62, so that the refrigerant in the liquid storage device 6 is released into the refrigerant circulation flow path to participate in circulation, and the operation energy efficiency of the heat pump system under the working condition is improved.
When the heat pump system operates under the working condition that the outlet water temperature of the water side heat exchanger 4 side is low or the environment temperature of the air side heat exchanger 3 side is high, the first valve element arranged on the first pipeline 61 is controlled to be opened, the second valve element arranged on the second pipeline 62 is controlled to be closed, part of the refrigerant in the refrigerant circulating flow path is stored in the liquid storage device 6 through the first pipeline 61, the refrigerant quantity participating in circulation is reduced, and the operating energy efficiency of the heat pump system under the working condition is improved.
Optionally, a throttling element is also provided on the second line 62.
Optionally, a throttling element is disposed between the second valve body element and the outlet end of second conduit 62. The throttling element reduces the pressure of the refrigerant flowing out of the liquid storage device 6 in the second pipeline 62. Optionally, the throttling element is a capillary tube 622.
Optionally, the first valve body element comprises a first solenoid valve 611; and/or the second valve element comprises a second solenoid valve 621.
The first valve element may be a first electromagnetic valve 611, and the conduction state of the first line 61 may be controlled by controlling the opening or closing of the first electromagnetic valve 611. When the first solenoid valve 611 is opened, the first pipeline 61 is conducted, and a portion of the refrigerant in the refrigerant circulation flow path can flow into the liquid storage device 6 through the first pipeline 61 for temporary storage. Alternatively, the amount of refrigerant flowing into the liquid storage device 6 may be adjusted by controlling the opening time of the first electromagnetic valve 611.
The second valve element may be a second electromagnetic valve 621, and the conduction state of the second pipeline 62 may be controlled by controlling the opening or closing of the second electromagnetic valve 621. When the second solenoid valve 621 is opened, the second pipe 62 is conducted, and the refrigerant stored in the liquid storage device 6 can flow into the refrigerant circulation flow path through the second pipe 62. Alternatively, the amount of refrigerant entering the refrigerant circulation flow path may be adjusted by controlling the opening time of the second solenoid valve 621.
Optionally, the second valve element may also be a throttle valve 623, as shown in FIG. 2. The pressure and the amount of refrigerant flowing into the refrigerant circulation flow path can be adjusted by controlling the opening size and the opening duration of the throttle valve 623.
Optionally, the heat pump system further includes a first controller configured to determine whether the condensing pressure of the water-side heat exchanger and the first exhaust temperature of the compressor satisfy a preset condition according to the outlet water temperature of the water-side heat exchanger, and then control the opening or closing of the first valve element and/or the second valve element, as shown in fig. 3.
Optionally, the outlet water temperature T of the water-side heat exchanger is obtained firstwAccording to the temperature T of the outlet waterwFurther determining the condensing pressure PdAnd a first exhaust temperature Td1Whether a preset condition is satisfied.
Alternatively, if the outlet water temperature TwAnd a first temperature threshold Tw1The difference of' is a positive value and the difference is greater than or equal to a first difference threshold Δ Tw1When, the condensing pressure P is obtaineddAnd a first exhaust temperature Td1(ii) a If the condensing pressure PdGreater than or equal to the first condensation pressure threshold value Pd1', and the first exhaust temperature Td1Greater than or equal to a first exhaust temperature threshold Td1When the valve is opened, the first valve element is controlled to be closed, and the second valve element is controlled to be opened for a first preset time, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline.
I.e. when T isw-Tw1'≥△Tw1When is, and, Pd≥Pd1'，Td1≥Td1When the refrigerant is stored in the liquid storage device, the refrigerant flows into the refrigerant circulation flow path through the second pipeline.
Alternatively, Tw1' may be 45 ℃ and. DELTA.Tw1' may be 10 ℃.
Under the condition that the ambient temperature is-15 ℃, when the outlet water temperature is 45 ℃, the refrigerant quantity in the refrigerant circulation loop is 3.5kg at the moment, the energy efficiency ratio COPw/w of the heat pump system is 2.0, and the refrigerant quantity in the refrigerant circulation loop is not required to be adjusted under the current outlet water temperature.
Under the condition of the ambient temperature of-15 ℃ and the effluent temperature of 55 ℃, in the refrigerantP of the heat pump system under the condition that the refrigerant amount in the circulating flow path is still 3.5kgd≥Pd1' and Td1≥Td1', the energy efficiency ratio COPw/w of the heat pump system is 1.4. After the second check valve is controlled to be opened for a first preset time, the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline, the amount of the refrigerant in the refrigerant circulation flow path is increased to 4.0kg, and the energy efficiency ratio COPw/w of the heat pump system is increased to 1.6. At the same time, the first discharge temperature T of the compressor is reducedd1. Under the condition of improving the energy efficiency ratio of the heat pump system, the operation stability of the heat pump system is improved at the same time.
If the temperature T of the discharged waterwAnd a first temperature threshold Tw1' the difference is negative and the absolute value of the difference is greater than or equal to a second difference threshold Δ Tw2When, the condensing pressure P is obtaineddAnd a first exhaust temperature Td1(ii) a If the condensing pressure PdLess than or equal to the second condensation pressure threshold value Pd2', and the first exhaust temperature Td1Less than or equal to the second exhaust gas temperature threshold Td2When the refrigerant circulating flow path is closed, the second valve element is controlled to be closed, and meanwhile, the first valve element is controlled to be opened for a second preset time, so that part of the refrigerant in the refrigerant circulating flow path enters the liquid storage device through the first pipeline.
I.e. when T isw1'-Tw≥△Tw2When is, and, Pd≤Pd2'，Td1≤Td2When the refrigerant circulating flow path is opened, the first valve body is controlled to be opened for a second preset time, so that part of the refrigerant in the refrigerant circulating flow path enters the liquid storage device through the first pipeline.
Alternatively, Tw1' may be 45 ℃ and. DELTA.Tw2' may be 10 ℃.
Under the condition that the ambient temperature is-15 ℃ and the outlet water temperature is 35 ℃, the P of the heat pump system is still 3.5kg of refrigerant in the refrigerant circulating flow pathd≤Pd2' and Td1≤Td2', the energy efficiency ratio COPw/w of the heat pump system is 2.1. After the first check valve is controlled to be opened for a second preset time, part of the refrigerant in the refrigerant circulation flow path flows into the liquid storage device for storage, the amount of the refrigerant in the refrigerant circulation flow path is reduced to 3.2kg,the energy efficiency ratio COPw/w of the heat pump system is improved to 2.4.
Optionally, the first controller is further configured to control the compressor to operate at a highest frequency.
The heat pump system provided by the embodiment of the disclosure can control the compressor to operate at the highest frequency no matter under the condition of higher outlet water temperature or lower outlet water temperature, so that the operating efficiency of the heat pump system is ensured.
Optionally, the heat pump system further includes a second controller configured to determine whether the evaporating pressure of the air-side heat exchanger and the second exhaust temperature of the compressor satisfy a preset condition according to the ambient temperature of the air-side heat exchanger, and then control the opening or closing of the first valve element and/or the second valve element.
Optionally, the ambient temperature T of the air-side heat exchanger is obtained firstaAccording to the ambient temperature TaFurther judging the evaporation pressure PsAnd a second exhaust temperature Td2Whether a preset condition is satisfied.
Alternatively, if the ambient temperature TaAnd a third temperature threshold Ta1' the difference is negative and the absolute value of the difference is greater than or equal to a third difference threshold Δ Ta1When, the evaporation pressure P is obtainedsAnd a second exhaust temperature Td2(ii) a If the evaporation pressure PsLess than or equal to the first evaporation pressure threshold Ps1', and a second exhaust temperature Td2Greater than or equal to a third exhaust gas temperature threshold Td3When the valve is opened, the first valve element is controlled to be closed, and the second valve element is controlled to be opened for a third preset time, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline.
I.e. Ta1'-Ta≥△Ta1When is, and, Ps≤Ps1'，Td2≥Td3When the refrigerant is stored in the liquid storage device, the refrigerant flows into the refrigerant circulation flow path through the second pipeline.
Alternatively, Ta1' may be-5 ℃ and. DELTA.Ta1' may be 10 ℃.
Under the condition that the outlet water temperature is 45 ℃ and the environment temperature is-5 ℃, the refrigerant quantity in the refrigerant circulation loop is 3.0kg at the moment, the energy efficiency ratio COPw/w of the heat pump system is 2.6, and the refrigerant quantity in the refrigerant circulation loop does not need to be adjusted under the current environment temperature.
Under the condition that the outlet water temperature is 45 ℃ and the environment temperature is-15 ℃, the P of the heat pump system is under the condition that the refrigerant quantity in the refrigerant circulating flow path is still 3.0kgs≤Ps1' and Td2≥Td3', the energy efficiency ratio COPw/w of the heat pump system is 1.8. After the second check valve is controlled to be opened for a third preset time, the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline, the amount of the refrigerant in the refrigerant circulation flow path is increased to 3.5kg, and the energy efficiency ratio COPw/w of the heat pump system is increased to 2.0.
When the ambient temperature continues to decrease, Ta1'-Ta≥2△Ta1When is, and, Ps≤Ps1'，Td2≥Td3When the refrigerant is stored in the liquid storage device, the second valve element is controlled to be opened for a third preset time, and the refrigerant stored in the liquid storage device continuously flows into the refrigerant circulation flow path through the second pipeline.
Under the condition that the outlet water temperature is 45 ℃ and the environment temperature is-25 ℃, the P of the heat pump system is under the condition that the refrigerant quantity in the refrigerant circulating flow path is still 3.0kgs≤Ps1' and Td2≥Td3', the energy efficiency ratio COPw/w of the heat pump system is 1.0. After the second check valve is controlled to be opened for a third preset time, the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline, the amount of the refrigerant in the refrigerant circulation flow path is increased to 4.0kg, and the energy efficiency ratio COPw/w of the heat pump system is increased to 1.3.
Alternatively, if the ambient temperature TaAnd a fourth temperature threshold Ta2The difference of' is a positive value and the difference is greater than or equal to a fourth difference threshold Δ Ta2When, the evaporation pressure P is obtainedsAnd a second exhaust temperature Td2(ii) a If the evaporation pressure PsGreater than or equal to a second evaporation pressure threshold Ps2', and a second exhaust temperature Td2Less than or equal to a fourth exhaust gas temperature threshold Td4When the refrigerant circulating flow path is closed, the second valve element is controlled to be closed, and meanwhile, the first valve element is controlled to be opened for a fourth preset time, so that part of the refrigerant in the refrigerant circulating flow path enters the liquid storage device through the first pipeline.
I.e. Ta-Ta2'≥△Ta2When is, and, Ps≥Ps2'，Td2≤Td4When the refrigerant circulating flow path is opened, the first valve element is controlled to be opened for a fourth preset time, so that part of the refrigerant in the refrigerant circulating flow path enters the liquid storage device through the first pipeline.
Optionally, the second controller is further configured to control the compressor to operate at a highest frequency.
The heat pump system provided by the embodiment of the disclosure can control the compressor to operate at the highest frequency no matter under the condition of higher ambient temperature or the condition of lower ambient temperature, thereby ensuring the operating efficiency of the heat pump system.
Optionally, the heat pump system further includes a third controller configured to determine whether the condensing pressure of the water-side heat exchanger, the evaporating pressure of the air-side heat exchanger, and/or the discharge temperature of the compressor satisfy a preset condition according to the outlet water temperature of the water-side heat exchanger and the ambient temperature of the air-side heat exchanger, and then control the first valve element and/or the second valve element to open or close, as shown in fig. 5 and 6.
Optionally, when the difference between the outlet water temperature and the first temperature threshold is a positive value, and the difference is greater than or equal to the first difference threshold, and meanwhile, the difference between the ambient temperature and the fourth temperature threshold is a positive value, and the difference is greater than or equal to the fourth difference threshold, whether a refrigerant lack condition is met is judged through the condensing pressure of the water side heat exchanger and the exhaust temperature of the compressor, if so, the second valve element is controlled to be opened for a fifth preset time period, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline, wherein the fifth preset time period is less than the first preset time period.
Optionally, the refrigerant shortage condition may be that the condensation pressure is greater than or equal to a third condensation pressure threshold, and the exhaust temperature is greater than or equal to a fifth exhaust temperature threshold, where the third condensation pressure threshold is less than the first condensation pressure threshold, and the fifth exhaust temperature threshold is less than the first exhaust temperature threshold.
When the difference value between the outlet water temperature and the first temperature threshold value is a positive value, the difference value is larger than or equal to the first difference threshold value, meanwhile, the difference value between the ambient temperature and the fourth temperature threshold value is a positive value, and the difference value is larger than or equal to the fourth difference threshold value, whether the multi-refrigerant condition is met is judged through the evaporation pressure of the air side heat exchanger and the exhaust temperature of the compressor, if yes, the first valve element is controlled to be opened for a sixth preset time length, so that part of the refrigerant in the refrigerant circulating flow path enters the liquid storage device through the first pipeline, and the sixth preset time length is smaller than the second preset time length.
Optionally, the multi-refrigerant condition may be that the evaporation pressure is less than or equal to a third evaporation pressure threshold, and the exhaust temperature is greater than or equal to a sixth exhaust temperature threshold, where the third evaporation pressure threshold is greater than the first evaporation pressure threshold, and the sixth exhaust temperature threshold is less than the third exhaust temperature threshold.
Optionally, the third controller is further configured to control the compressor to operate at a highest frequency.
The heat pump system provided by the embodiment of the disclosure can control the compressor to operate at the highest frequency under various operating conditions, and ensures the operating efficiency of the heat pump system.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A heat pump system, comprising:
the refrigerant circulating flow path comprises a compressor, a four-way valve, an air side heat exchanger, a water side heat exchanger and a gas-liquid separator; and the combination of (a) and (b),
the liquid storage pipeline comprises a liquid storage device, a first pipeline and a second pipeline, one end of the first pipeline and one end of the second pipeline are both communicated with a liquid inlet of the liquid storage device,
the other end of the first pipeline is communicated with a first refrigerant pipeline between the air side heat exchanger and the water side heat exchanger, and a first valve element is arranged on the first pipeline; the other end of the second pipeline is communicated with a second refrigerant pipeline between the four-way valve and the gas-liquid separator, and a second valve element is arranged on the second pipeline.
2. The heat pump system of claim 1,
and a throttling element is also arranged on the second pipeline.
3. The heat pump system of claim 1,
the first valve body member comprises a first solenoid valve; and/or the presence of a gas in the gas,
the second valve element comprises a second solenoid valve.
4. The heat pump system of claim 2,
the throttling element comprises a capillary tube.
5. The heat pump system according to any one of claims 1 to 4, further comprising:
the first controller is configured to judge whether the condensation pressure of the water side heat exchanger and the first exhaust temperature of the compressor meet preset conditions according to the outlet water temperature of the water side heat exchanger, and then control the opening or closing of the first valve body element and/or the second valve body element.
6. The heat pump system according to claim 5, wherein the determining whether the condensing pressure of the water-side heat exchanger and the first exhaust temperature of the compressor satisfy a preset condition according to the outlet water temperature of the water-side heat exchanger, and further controlling the opening or closing of the first valve element and/or the second valve element comprises:
if the difference value between the outlet water temperature and the first temperature threshold value is a positive value, and the difference value is greater than or equal to the first difference value threshold value, acquiring the condensation pressure and the first exhaust temperature; if the condensing pressure is greater than or equal to a first condensing pressure threshold value and the first exhaust temperature is greater than or equal to a first exhaust temperature threshold value, controlling the first valve element to be closed, and simultaneously controlling the second valve element to be opened for a first preset time period, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline; alternatively, the first and second electrodes may be,
if the difference value between the outlet water temperature and the first temperature threshold value is a negative value, and the absolute value of the difference value is greater than or equal to a second difference value threshold value, acquiring the condensation pressure and a first exhaust temperature; and if the condensation pressure is less than or equal to a second condensation pressure threshold value and the first exhaust temperature is less than or equal to a second exhaust temperature threshold value, controlling the second valve element to be closed, and simultaneously controlling the first valve element to be opened for a second preset time period, so that part of the refrigerant in the refrigerant circulation flow path enters the liquid storage device through the first pipeline.
7. The heat pump system of claim 6,
the first controller is further configured to control the compressor to operate at a highest frequency.
8. The heat pump system according to any one of claims 1 to 4, further comprising:
and the second controller is configured to judge whether the evaporation pressure of the air side heat exchanger and the second exhaust temperature of the compressor meet preset conditions according to the ambient temperature of the air side heat exchanger, and further control the opening or closing of the first valve body element and/or the second valve body element.
9. The heat pump system according to claim 8, wherein said determining whether the evaporating pressure of the air-side heat exchanger and the second discharge temperature of the compressor satisfy a predetermined condition according to the ambient temperature of the air-side heat exchanger, and further controlling the opening or closing of the first valve element and/or the second valve element comprises:
if the difference value between the ambient temperature and the third temperature threshold is a negative value and the absolute value of the difference value is greater than or equal to the third difference threshold, acquiring the evaporation pressure and a second exhaust temperature; if the evaporation pressure is less than or equal to a first evaporation pressure threshold value and the second exhaust temperature is greater than or equal to a third exhaust temperature threshold value, controlling the first valve element to close, and simultaneously controlling the second valve element to open for a third preset time period, so that the refrigerant stored in the liquid storage device flows into the refrigerant circulation flow path through the second pipeline; alternatively, the first and second electrodes may be,
if the difference value between the ambient temperature and the fourth temperature threshold is a positive value and is greater than or equal to the fourth difference threshold, acquiring the evaporation pressure and a second exhaust temperature; and if the evaporation pressure is greater than or equal to a second evaporation pressure threshold value and the second exhaust temperature is less than or equal to a fourth exhaust temperature threshold value, controlling the second valve element to close, and simultaneously controlling the first valve element to open for a fourth preset time period, so that part of the refrigerant in the refrigerant circulation flow path enters the liquid storage device through the first pipeline.
10. The heat pump system of claim 9,
the second controller is further configured to control the compressor to operate at a highest frequency.
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