KR102329030B1 - Free-cooling air conditioner, controlling system and controlling device of the same - Google Patents

Abstract

Embodiments of the present invention provide a control method for a natural-cooling machine room air conditioner. The method comprises the steps of: acquiring a control instruction causing a natural-cooling machine room air conditioner to enter a pump working state; controlling the natural-cooling machine room air conditioner to work in a first working mode in accordance with the control instruction; obtaining a cold load of the natural-cooling machine room air conditioner when the natural-cooling machine room air conditioner meets a preset trigger condition in the first working mode; determining a second working mode in accordance with the cold load, the second working mode being different from the first working mode; and controlling the natural-cooling machine room air conditioner to work in the second working mode. When the natural-cooling machine room air conditioner is in the pump working state, the first and second working modes of the natural-cooling machine room air conditioner are controlled so that a refrigerant pump can be rapidly started and the stable refrigerating output time can be shortened. Therefore, the working efficiency of the natural-cooling machine room air conditioner in the pump working state is improved, and the temperature in a machine room is conveniently controlled. The embodiments of the present invention further provide the natural-cooling machine room air conditioner and a control device for the natural-cooling machine room air conditioner.

Description

Free-cooling air conditioner, controlling system and controlling device of the same

The present invention relates to the field of air conditioner cooling technology, and more particularly, to a control method, a control device, and a naturally cooling machine room air conditioner for a naturally cooling machine room air conditioner.

In order to keep the indoor temperature of the industrial and information machine room constant, one characteristic of the machine room air conditioner is to perform cooling all year round, and when the machine room temperature is lower than the indoor temperature, an outdoor natural cooling source can be used directly or indirectly. Direct use of a natural cooling source is limited by conditions such as air quality and geographic location, so indirectly using an outdoor natural cooling source is a commonly used solution for air conditioners in machine rooms at present.

Here, the fluorine pump circulation natural cooling method is a competitive high-efficiency energy-saving method. The fluorine pump circulation natural cooling air conditioner system includes a fluorine pump, a throttle, an evaporator, and a condenser, and is connected to a closed system by a copper tube that withstands high pressure. and the refrigerant is circulated in the fluorine pump system. Its working principle is that the fluorine pump forces the liquid refrigerant to flow through the throttle to the evaporator, the indoor hot air releases heat to the refrigerant circulating in the evaporator, the refrigerant absorbs heat, and a small portion of the refrigerant absorbs heat. It is absorbed and vaporized, and the liquid refrigerant with bubbles is circulated into the condenser, and the amount of heat contained therein is released to the outdoor atmosphere. However, if the fluorine pump is operated and operated stably for a long time, the air conditioner does not have cooling output for a long time, so the temperature of the machine room increases, which affects the temperature control of the machine room.

In view of this, the present invention provides a control method, a control device and a naturally cooling machine room air conditioner for improving the above problems.

According to one aspect, an embodiment of the present invention provides a method for controlling a naturally cooling machine room air conditioner, wherein the naturally cooling machine room air conditioner includes a condenser, a refrigerant pump, a throttle valve and an evaporator, and the operating state of the naturally cooling machine room air conditioner is a pump operation state, and when the naturally cooling machine room air conditioner is in the pump operation state, the condenser, the refrigerant pump, the throttle valve, and the evaporator are sequentially connected to form an operation circuit. The control method may include: acquiring a control command for causing the air conditioner of the natural cooling machine room to enter a pump operation state; In accordance with the control command, the air conditioner of the natural cooling machine room is controlled to operate in a first operation mode, but in the first operation mode, the rotation speed of the condenser is adjusted to satisfy the first preset rotation speed range, and the rotation speed of the refrigerant pump is 2 adjusting to satisfy a preset rotational speed range, comprising adjusting an opening degree of a throttle valve to satisfy a first preset opening degree range; acquiring a cooling load of the naturally cooling machine room air conditioner when the naturally cooling machine room air conditioner satisfies a preset trigger condition in the first operation mode; determining a second operating mode according to the cooling load, wherein the second operating mode is different from the first operating mode; and controlling the naturally cooling machine room air conditioner to operate according to the second operation mode.

In some embodiments, the first operating mode controls the condensing fan of the condenser to operate at a first rotational speed, the first rotational speed being a rated rotational speed of the condensing fan; control the refrigerant pump to operate at a second rotational speed, the second rotational speed being half of the rated rotational speed of the refrigerant pump; Control the throttle valve to operate to a preset opening degree, and the preset opening degree includes half of the rated opening degree of the throttle valve.

In some embodiments, the preset trigger condition includes: maintaining a time for which the naturally cooling machine room air conditioner operates in the first operation mode satisfies the preset time range; The preset time range is greater than or equal to 5 minutes and less than or equal to 15 minutes.

In some embodiments, acquiring the cold load of the naturally cooling machine room air conditioner includes: acquiring a current machine room temperature; and determining the cooling load of the naturally cooling machine room air conditioner according to the current machine room temperature and the target temperature. The step of determining the second operation mode according to the cold load may include adjusting the rotation speed of the condenser to satisfy the third preset rotation speed range according to the cold load, and the rotation speed of the refrigerant pump is the fourth preset rotation speed range and adjusting the opening degree of the throttle valve to satisfy the second preset opening degree range.

In some embodiments, after controlling the natural cooling machine room air conditioner to operate according to the second operating mode, the method includes: acquiring an actual subcooling degree of the refrigerant; obtaining a comparison result between an actual subcooling degree and a target subcooling degree range; and obtaining a heating flow rate of the refrigerant according to the comparison result.

In some embodiments, obtaining the actual subcooling degree of the refrigerant comprises: obtaining the pressure of the refrigerant at the input end of the throttle valve; determining the saturation temperature of the refrigerant according to the pressure; obtaining a current temperature of the refrigerant; and determining the actual degree of subcooling of the refrigerant according to the current temperature and the saturation temperature.

In some embodiments, the obtaining of the heating flow rate of the refrigerant according to the comparison result may include: when the actual degree of subcooling is in the target range of the degree of subcooling, controlling the flow rate of heating of the coolant to 0; increasing the heating flow rate of the refrigerant when the actual degree of subcooling is greater than the upper limit of the range of the target degree of subcooling; and reducing the heating flow rate of the refrigerant when the actual degree of subcooling is smaller than the lower limit of the range of the target degree of subcooling.

An embodiment of the present invention further provides a control device for a natural cooling machine room air conditioner. The control device includes a command acquisition module, a first execution module, a cold load acquisition module, a second operation mode determination module and a second execution module. The command acquisition module acquires a control command to cause the air conditioner of the natural cooling machine room to enter the pump operation state. The first performing module controls the naturally cooling machine room air conditioner to operate in a first operating mode according to the control command, but in the first operating mode, the rotation speed of the condenser is adjusted to satisfy a first preset rotation speed range, and the refrigerant pump adjusting the rotation speed to satisfy the second preset rotation speed range, and adjusting the opening degree of the throttle valve to satisfy the first preset opening degree range. The cooling load acquisition module acquires the cooling load of the naturally cooling machine room air conditioner when the naturally cooling machine room air conditioner satisfies a preset trigger condition in the first operation mode. The second operating mode determining module determines a second operating mode according to the cold load, the second operating mode being different from the first operating mode. The second execution module controls the natural cooling machine room air conditioner to operate according to the second operation mode.

An embodiment of the present invention further provides a naturally cooling machine room air conditioner including a condenser, a refrigerant pump, a throttle valve, an evaporator, a heat exchanger and a controller. The controller is electrically connected to the condenser, refrigerant pump, throttle valve, evaporator and heat exchanger. The controller includes a pump mode, and when the controller is in the pump mode, a condenser, a refrigerant pump, a heat exchanger, a throttle valve, and an evaporator are sequentially connected to form an operation circuit. The controller controls the natural cooling machine room air conditioner by performing the above-described control method of the naturally cooling machine room air conditioner.

In some embodiments, the natural cooling machine room air conditioner includes a compressor, the compressor being connected between the evaporator and the condenser; There is no intake solenoid valve installed between the compressor and the evaporator. The controller further includes a compressor mode, when the controller is in the compressor mode, the evaporator, the compressor, the condenser and the throttle valve are sequentially connected to form an operation circuit.

The control method, control device and natural cooling machine room air conditioner provided by the embodiment of the present invention is a refrigerant pump through control of the first operation mode and the second operation mode when the natural cooling machine room air conditioner is in the pump operation state. It improves the operating efficiency of the air conditioner in the natural cooling machine room when the pump is in operation and conveniently controls the temperature in the machine room by enabling the fast operation of the machine and shortening the stable cooling output time.

In order to better explain the means for solving the problems according to the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below. The drawings described below are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings may be obtained by these drawings without making efforts to create inventive step.
1 is a structural schematic diagram of a natural cooling machine room air conditioner provided by an embodiment of the present invention.
FIG. 2 is a control circuit block diagram of the air conditioner of the natural cooling machine room shown in FIG. 1 .
Figure 3 is another structural schematic diagram of the natural cooling machine room air conditioner provided by the embodiment of the present invention.
4 is a flowchart of a method for controlling a natural cooling machine room air conditioner provided by an embodiment of the present invention.
FIG. 5 is a flowchart of step S105 shown in FIG. 4 .
6 is a flowchart of steps after step S109 shown in FIG. 4 .
7 is a schematic diagram of a functional module of a control device for a natural cooling machine room air conditioner provided by an embodiment of the present invention.

In order for those skilled in the art to better understand the solutions of the present invention, the solutions of the problems according to the embodiments of the present invention will be described more clearly and completely with reference to the drawings among the embodiments of the present invention below. do.

When terminology used in the specification and claims refers to a specific member, those skilled in the art should understand that hardware manufacturers may use different names to refer to the same member. The specification and claims do not distinguish members due to different names. The functional difference of the member is used as a classification principle. The term “approximately” referred to in the first half of the specification and claims means that a person skilled in the art basically reaches a technical effect by solving a technical problem within a predetermined error range.

In a system that requires year-round cooling, such as data centers and production methods that require some year-round cooling, if the outdoor temperature is lower or much lower than the circulating frozen water temperature, the operation of the chilled water unit also requires normal operation. When the outdoor temperature is low, the cooling water can be directly circulated using cold air to reduce the operation of cooling the compressor or provide cold energy for the indoor unit of the air conditioner without operating completely. This method is called a natural cooling method, and a unit having such a function is called a natural cooling unit. The distinction between this and a conventional chilled water unit is that, first, the circulating water is cooled using low-temperature air in the natural environment, and the cooling proceeds without the operation of the compressor, so that the power consumption of the compressor can be significantly saved.

1 and 2 together, the embodiment of the present invention provides a natural cooling machine room air conditioner 100 , and the natural cooling machine room air conditioner 100 includes a condenser 110 , a refrigerant pump 130 , and a throttle valve 150 . ), an evaporator 170 , a heat exchanger 190 and a controller 101 . The controller 101 is electrically connected to the condenser 110 , the refrigerant pump 130 , the throttle valve 150 , the evaporator 170 , and the heat exchanger 190 , and controls operating parameters of each member.

In this embodiment, the naturally cooling machine room air conditioner 100 has a pump operation state, and when the natural cooling machine room air conditioner 100 is in the pump operation state, the condenser 110 , the refrigerant pump 130 , and the heat exchanger 190 . , the throttle valve 150 and the evaporator 170 are sequentially connected to form an operating circuit.

Specifically, the condenser 110, the refrigerant pump 130, the throttle valve 150, the evaporator 170, and the heat exchanger 190 are sequentially connected through a conduit, so that the refrigerant is sequentially transferred to the refrigerant pump 130, heat exchange The condenser 110 may be reached through the condenser 190 , the throttle valve 150 , and the evaporator 170 . Here, the refrigerant entering the condenser 110 may return to the refrigerant pump 130 and complete the refrigerant circulation through the refrigerant pump 130 again. The refrigerant entering the condenser 110 may directly reach the throttle valve 150 from the condenser 110 to complete the refrigerant circulation.

In one embodiment, the liquid outlet end of the refrigerant pump 130 and the liquid outlet end of the condenser 110 may be merged into the same conduit (“liquid outlet conduit” in the description below refers to the conduit of the corresponding portion) and That is, the refrigerant may selectively reach the throttle valve 150 through the condenser 110 or the refrigerant pump 130 . It should be explained that when the naturally cooling machine room air conditioner 100 is in the pump operation state, the refrigerant realizes the cooling process of the natural cooling machine room air conditioner 100 through the circulation process.

In the present embodiment, when the refrigerant passes through the heat exchanger 190 , the heat exchanger 190 heats the refrigerant to increase the temperature of the refrigerant passing through the heat exchanger 190 to reduce the degree of subcooling of the refrigerant. As a result, the refrigerant passing through the throttle valve 150 enters two states in which gas and liquid are mixed, thereby improving the division uniformity and heat exchange efficiency of the refrigerant in the evaporator 170 and cooling efficiency of the air conditioner 100 in the natural cooling machine room. increase

In one embodiment, the heat exchanger 190 may be a superheated coil pipe, which is installed on the windward side of the hot air of the evaporator 170 to heat the refrigerant using the hot air of the evaporator 170 . For example, the liquid inlet end of the heat exchanger 190 is installed on the Leeward side of the evaporator 170 to increase the contact area between the heat exchanger 190 and the hot air. Here, when the natural cooling air conditioner operates, hot air in the room flows to the evaporator 170 and heat exchange with the heat exchanger 190 to heat the refrigerant in the heat exchanger 190 . In addition, in order to improve the heat exchange efficiency of the heat exchanger 190, if a heat coil pipe of a finned tube type is preferably used as the heat exchanger 190, the outer surface area of the heat exchanger 190 can be increased and heat exchange efficiency can be increased. .

In another embodiment, the heat exchanger 190 may be a wall-type heat exchanger 190 using hot water as a heat medium, and the heat exchanger 190 through the hot water circulated in the heat exchanger 190 . By heating the refrigerant, its degree of subcooling is reduced. It should be explained that the heat exchanger 190 heats the refrigerant flowing into the heat exchanger 190 through the hot water circulated in the heat exchanger 190 to reduce the degree of supercooling. It should be noted that the heat exchanger 190 may be of any type, such as a casing pipe, a fin attached pipe, a microchannel, and a shell tube. According to the actual operating situation of the natural cooling machine room air conditioner 100, a corresponding heat source can be set for the heat exchanger 190, and the heat source is not limited to the above-described two types of hot air and hot water, and will not be described in more detail here. .

The natural cooling machine room air conditioner 100 further includes a control valve 120 , the control valve 120 may be a three-way valve, and the control valve 120 includes a liquid inlet end of the heat exchanger 190 and a throttle valve 150 . ) is connected to the liquid inlet end and the liquid outlet conduit. Here, the refrigerant temperature of the throttle valve 150 can be adjusted by controlling the flow rate of the refrigerant entering the heat exchanger 190 through the liquid outlet conduit and entering the throttle valve 150 through different open states of the three-way valve. It should be explained that the "liquid inlet end", "liquid outlet end", etc. are flow directions in which the refrigerant is circulated in a state in which the naturally cooling machine room air conditioner 100 is pumped.

Specifically, through the control of the control valve 120, the refrigerant passing through the liquid outlet conduit may be heated through the heat exchanger 190 and then enter the throttle valve 150 again, and the refrigerant may directly enter the throttle valve 150. You can also allow it to enter . This process controls the flow rate of the refrigerant entering the heat exchanger 190 to adjust the temperature of the refrigerant so that the actual degree of subcooling of the refrigerant approaches the target degree of subcooling. This allows the refrigerant after throttle to enter two states in which gas and liquid are mixed, thereby improving the division uniformity and heat exchange efficiency of the refrigerant in the evaporator 170 and increasing the cooling amount of the air conditioner 100 in the natural cooling machine room.

In another embodiment, as shown in FIG. 3 , the regulating valve 120 may include a first regulating valve 121 and a second regulating valve 123 , and the first regulating valve 121 may include a liquid outlet connected between the conduit and the liquid inlet end of the heat exchanger 190 , and a second regulating valve 123 is connected between the liquid outlet conduit and the liquid inlet end of the throttle valve 150 , the first regulating valve 121 and The flow rate of the refrigerant entering the heat exchanger 190 may be controlled through the control of the second control valve 123 , and the temperature of the refrigerant entering the throttle valve 150 may be controlled through subcooling of the refrigerant. control the figure For example, when the actual degree of subcooling of the refrigerant is greater than the target degree of subcooling of the refrigerant, the degree of opening of the first control valve 121 is increased and the degree of opening of the second control valve 123 is decreased, so that the coolant is transferred to the heat exchanger ( 190) by increasing the flow rate to be heated to increase the temperature of the refrigerant and reduce the degree of subcooling of the refrigerant.

What should be explained is that when the natural cooling machine room air conditioner 100 is used in a cold area, the control valve 120 can be omitted because the refrigerant is always in a high degree of supercooling, and all the refrigerant passing through the liquid outlet conduit is a heat exchanger ( 190) and then re-enters the throttle valve 150 to reduce the degree of supercooling of the refrigerant.

In one embodiment, the natural cooling machine room air conditioner 100 further includes a temperature sensor 140 and a pressure sensor 160 , wherein both the temperature sensor 140 and the pressure sensor 160 are liquid inlet of the throttle valve 150 . It is installed in the stage, and measures the temperature and pressure of the refrigerant entering the throttle valve 150 .

In the present embodiment, the natural cooling machine room air conditioner 100 further includes a compressor 180 , and the compressor 180 is connected between the evaporator 170 and the condenser 110 . In addition, the natural cooling machine room air conditioner 100 has a compressor 180 operating state, and when the natural cooling machine room air conditioner 100 is in the compressor 180 operating state, the evaporator 170 , the compressor 180 , and the condenser 110 . ) and the throttle valve 150 are sequentially connected to form an operating circuit.

Specifically, the evaporator 170 , the compressor 180 , the condenser 110 , and the throttle valve 150 are sequentially connected through a conduit so that the refrigerant is sequentially connected to the throttle valve 150 , the evaporator 170 , and the compressor 180 . ), the condenser 110 and the throttle valve 150 may form an operating circuit. Here, the refrigerant entering the condenser 110 may reach the throttle valve 150 after selectively passing through the heat exchanger 190 through the control of the control valve 120 , and may reach the throttle valve 150 directly. have. It should be explained that when the naturally cooling machine room air conditioner 100 is in the operating state of the compressor 180 , the refrigerant realizes the cooling process of the natural cooling machine room air conditioner 100 through the circulation process.

In addition, since the intake solenoid valve is not installed between the compressor 180 and the evaporator 170, the intake air pressure loss when the compressor 180 is operated is prevented so that the natural cooling machine room air conditioner 100 is in the operating state of the compressor 180. In this case, the operating process efficiency is higher. In addition, a situation in which the intake solenoid valve becomes ineffective and the compressor 180 burns is prevented from occurring, thereby extending the service life of the compressor 180 .

In the present embodiment, as shown in FIG. 2 , the controller 101 is also electrically connected to the temperature sensor 140 , the pressure sensor 160 and the compressor 180 , and the controller 101 is in the pump mode and compressor mode is provided. Here, when the controller 101 is in the pump mode, the natural cooling machine room air conditioner 100 is in the pump operation state. When the controller 101 is in the compressor mode, the natural cooling machine room air conditioner 100 is in the compressor 180 operating state. That is, it is possible to control the operating state of the natural cooling machine room air conditioner 100 through the controller 101 .

The controller 101 controls the flow rate at which the refrigerant is heated through the heat exchanger 190 in accordance with the data of the temperature sensor 140 and the pressure sensor 160, and adjusts the degree of subcooling of the refrigerant by adjusting the degree of subcooling of the refrigerant and the preset level of subcooling. The degree of supercooling is matched and the operating efficiency of the air conditioner 100 of the natural cooling machine room is improved. For example, the controller 101 may perform control using a proportional-integral-derivative control (PID control) method, and adjust according to data from the temperature sensor 140 and the pressure sensor 160 . By controlling the degree of opening of the valve 120 , the flow rate at which the refrigerant enters the heat exchanger 190 and is heated is controlled.

In addition, the controller 101 may also control the operating parameters of the condenser 110 , the refrigerant pump 130 , the throttle valve 150 , and the like, and may improve the operating efficiency of the natural cooling machine room air conditioner 100 .

The natural cooling machine room air conditioner 100 provided by the embodiment of the present invention, when the natural cooling machine room air conditioner 100 is in the pump operation state, the controller 101 performs the first operation mode and the second operation of the natural cooling machine room air conditioner 100 By controlling the mode, it is possible to quickly operate the refrigerant pump 130 and reduce the stable cooling output time, thereby improving the operating efficiency of the natural cooling machine room air conditioner 100 in the pump operating state and conveniently controlling the temperature in the machine room. have.

In addition, the actual degree of supercooling is lowered to the target degree of subcooling by increasing the temperature of the refrigerant with a large degree of supercooling by using temperature difference heat exchange through the method of installing the heat exchanger 190 before throttling, so that the actual degree of subcooling and the target degree of subcooling are close to each other . This allows the refrigerant after throttle to enter two states in which gas and liquid are mixed, thereby improving the division uniformity and heat exchange efficiency of the refrigerant in the evaporator 170 and increasing the cooling amount of the air conditioner 100 in the natural cooling machine room.

Referring to FIG. 4 , an embodiment of the present invention further provides a control method of a naturally cooling machine room air conditioner applied to a naturally cooling machine room air conditioner. Natural cooling machine room air conditioner includes a condenser, refrigerant pump, throttle valve and evaporator, naturally cooling machine room air conditioner includes pump operation state, and when the natural cooling machine room air conditioner is in pump operation state, condenser, refrigerant pump, throttle valve and evaporator are sequentially connected to form a working circuit. Specifically, the control method includes steps S101 to S109.

In step S101, a control command for causing the air conditioner of the natural cooling machine room to enter the pump operation state is acquired.

In the present embodiment, the operating state of the naturally cooling machine room air conditioner includes the pump operating state. When a control command for causing the naturally cooling machine room air conditioner to enter the pump operation state is obtained, the refrigerant of the naturally cooling machine room air conditioner is circulated in the operating circuit formed by the condenser, the refrigerant pump, the throttle valve and the evaporator.

In step S103, according to the control command, the natural cooling machine room air conditioner is controlled to operate in the first operation mode.

In the present embodiment, when the naturally cooling machine room air conditioner is in the pump operation state, it is possible to directly control the operation of the naturally cooled machine room air conditioner in the first operation mode, thereby shortening the fast operation of the refrigerant pump and the stable cooling output time.

Specifically, in the first operating mode, the rotation speed of the condenser is adjusted to satisfy a first preset rotation speed range, the rotation speed of the refrigerant pump is adjusted to satisfy the second preset rotation speed range, and the degree of opening of the throttle valve and adjusting to satisfy the first preset opening degree range. In this embodiment, the first preset rotation speed range may be to control the condensing fan of the condenser to operate at 75% to 100% of the rated rotation speed, and the second preset rotation speed range is the refrigerant pump at the rated rotation speed It may be to control to operate at 40% to 60% of the throttle, and the first preset opening degree range may be to control the throttle valve to operate at 40% to 60% of the preset opening degree.

For example, the first operating mode is to control the condensing fan of the condenser to operate at a first rotational speed, the first rotational speed being a rated rotational speed of the condensing fan; control the refrigerant pump to operate at a second rotational speed, the second rotational speed being half of the rated rotational speed of the refrigerant pump; The throttle valve may be controlled to operate at a preset opening degree, and the preset opening degree may include half a rated opening degree of the throttle valve. Here, when the condensing fan operates at the first rotational speed (rated rotational speed), the heat exchange efficiency of the condenser can be increased, and the refrigerant pump operating at the first rotational speed and the throttle valve operating at a preset opening degree include the refrigerant in the condenser, It can accelerate the circulation efficiency in the operating circuit formed by the refrigerant pump, the throttle valve and the evaporator, thereby improving the cooling efficiency of the natural cooling machine room air conditioner. It should be noted that the operating parameter of each member in the first operating mode is not limited to the above example, and may be another parameter that enables the natural cooling machine room air conditioner in a different pump operating state to rapidly output cooling, and will not be described herein any more.

When the naturally cooling machine room air conditioner satisfies the preset trigger condition in the first operation mode in step S105, the cooling load of the naturally cooling machine room air conditioner is acquired.

In this embodiment, the preset trigger condition includes maintaining the time for which the naturally cooling machine room air conditioner operates in the first operating mode satisfies the preset time range, wherein the preset time range is greater than or equal to 5 minutes less than or equal to 15 minutes. For example, the preset trigger condition is a state in which the condensing fan of the air conditioner of the natural cooling machine room operates at the first rotation speed, the refrigerant pump operates at the second rotation speed, and the throttle valve operates to the preset opening degree within 10 minutes. It can be controlled to keep.

For example, the cooling load of the naturally cooling machine room air conditioner may be acquired after the naturally cooling machine room air conditioner operates in the first control mode for 10 minutes.

Specifically, with reference to FIG. 5 , in the present embodiment, the step of acquiring the cold load of the naturally cooling machine room air conditioner may include steps S201 to S203.

In step S201, the current machine room temperature is acquired.

In the present embodiment, the current temperature of the machine room may be acquired through a temperature sensor or the like.

In step S203, the cooling load of the naturally cooling machine room air conditioner is determined according to the current machine room temperature and the target temperature.

In the present embodiment, the cooling load of the naturally cooling machine room air conditioner is determined according to the current machine room temperature and the target temperature. Here, the cooling load of the naturally cooling machine room air conditioner refers to the amount of cooling provided in the machine seal through the operation of the natural cooling machine room air conditioner when the current machine room temperature is adjusted to the target temperature.

In step S107, a second operation mode is determined according to the cooling load.

In this embodiment, the second operation mode is different from the first operation mode. That is, the second operation mode has a control parameter for each member and the first operation mode has a different control parameter for each member.

In this embodiment, the rotation speed of the condenser is adjusted to satisfy the third preset rotation speed range according to the cooling load, the rotation speed of the refrigerant pump is adjusted to satisfy the fourth preset rotation speed range, and the opening of the throttle valve The degree is adjusted to satisfy the second preset opening degree range.

Here, the third preset rotation speed range may be that the rotation speed of the condensing fan of the condenser is within the rated rotation speed, and the fourth preset rotation speed range may be that the rotation speed of the refrigerant pump is within the rated rotation speed, The second preset opening degree range may be such that the opening degree of the throttle valve is within the rated opening degree.

In addition, determining the second operating mode according to the cold load is by adjusting the condenser rotation speed, the refrigerant pump rotation speed and the throttle valve opening degree through the cold load, so that the condenser rotation speed is within the third preset rotation speed range, This is to ensure that the refrigerant pump rotation speed is within the fourth preset rotation speed range and the throttle valve opening degree is within the second preset opening degree range. This ensures that the naturally cooling machine room air conditioner provides an appropriate cooling load, thereby preventing the condenser, refrigerant pump and throttle valve from being damaged beyond the operating limit, thereby prolonging the service life of the naturally cooling machine room air conditioner.

In step S109, the natural cooling machine room air conditioner is controlled to operate according to the second operation mode.

In this embodiment, the condenser, the refrigerant pump, and the throttle valve are respectively controlled by the condenser rotation speed, the refrigerant pump rotation speed, and the throttle valve opening degree determined according to the second operation mode. This ensures that the naturally cooling machine room air conditioner provides an appropriate cooling load, thereby preventing the condenser, refrigerant pump and throttle valve from being damaged beyond the operating limit, thereby prolonging the service life of the naturally cooling machine room air conditioner.

In addition, in some embodiments, in order to improve the operating efficiency of the naturally cooling machine room air conditioner, the supercooling degree of the refrigerant is adjusted by heating the refrigerant entering the throttle valve after step S109 so that the actual subcooling degree of the refrigerant matches the preset value. . Referring to FIG. 6 , the method for controlling the natural cooling air conditioner provided by the embodiment of the present invention may further include steps S301 to S305.

In step S301, the actual degree of subcooling of the refrigerant is obtained.

In the present embodiment, in the process of obtaining the actual subcooling degree Ta of the refrigerant, the refrigerant first obtains the pressure P1 at the input end of the throttle valve, and determines the saturation temperature T0 of the refrigerant according to the pressure P1. Next, the current temperature T1 of the refrigerant is obtained, and the actual degree of subcooling Ta of the refrigerant is determined according to the current temperature T1 and the saturation temperature T0. Here, the actual degree of undercooling Ta may be Ta = T0 - T1.

It should be explained that the determination of the saturation temperature T0 of the refrigerant according to the pressure P1 is obtained by inquiring the saturation temperature T0 corresponding to the refrigerant at the pressure P1 through the refrigerant attribute table.

In step S303, a comparison result between the actual subcooling degree and the target subcooling degree range is obtained.

In the present embodiment, the target subcooling degree Ts and precision a are set according to the actual operating environment (eg, machine room temperature, outdoor temperature, etc.) of the naturally cooling machine room air conditioner, and the target subcooling degree range Tb = [Ts-a, Ts+a] ] is obtained. For example, when the target subcooling degree Ts = 7°C and a = 0.2°C, the target subcooling degree range Tb = [6.8°C, 7.2°C].

What should be explained is that the target subcooling degree Ts of the refrigerant is data obtained after analyzing the actual operating environment of the air conditioner in the natural cooling machine room. Here, the refrigerant meeting the target supercooling degree Ts is sufficiently heat-exchanged in the evaporator during the circulation process, so that the heat exchange efficiency of the evaporator may be improved. By setting the target subcooling range Tb when the air conditioner in the natural cooling machine room is operating, it is convenient to control the temperature of the refrigerant, the heat exchange efficiency of the evaporator is high, and the cooling efficiency of the air conditioner in the natural cooling machine room can be increased.

In addition, the step of obtaining a comparison result between the actual subcooling degree and the target subcooling degree range includes: the actual subcooling degree is in the target subcooling degree range; the actual subcooling degree is greater than the upper limit of the target subcooling degree range; There may be three cases in which the actual degree of subcooling is smaller than the lower limit of the target subcooling range. It should be explained that when the actual degree of subcooling is larger than the upper limit of the target subcooling range, the actual degree of subcooling is greater than Ts+a. When the actual subcooling degree is smaller than the lower limit of the target subcooling degree range, the actual subcooling degree is smaller than Ts-a.

In step S305, a heating flow rate of the refrigerant is obtained according to the comparison result.

In the present embodiment, according to step S303, there are three comparison results between the actual subcooling degree and the target subcooling degree range. Therefore, depending on the comparison results, the heating flow rate of the refrigerant is also correspondingly different.

Specifically, when the actual subcooling degree is within the target subcooling degree range, the heating flow rate of the refrigerant is controlled to zero. For example, if the actual supercooling degree is Ta = 7°C and the target subcooling degree range Tb = [6.8°C, 7.2°C], then, since the actual subcooling degree of the refrigerant is in the target subcooling degree range, there is no need to heat the refrigerant. At this time, the refrigerant may flow directly into the throttle valve from the refrigerant pump.

When the actual subcooling degree is greater than the upper limit of the target subcooling degree range, the heating flow rate of the refrigerant is increased. For example, if the actual degree of subcooling is Ta = 7.5°C and the target subcooling range Tb = [6.8°C, 7.2°C], then the actual degree of subcooling of the refrigerant is larger than the upper limit of the target degree of subcooling. In other words, since the evaporator heat exchange may become insufficient, the heating flow rate of the refrigerant is increased so that the actual subcooling temperature of the refrigerant after heating can fall within the target subcooling degree range. In this case, since the temperature of the refrigerant entering the throttle valve may be increased by increasing the heating flow rate of the refrigerant, the actual subcooling degree of the refrigerant may be adjusted to be within the target subcooling degree range.

When the actual subcooling degree is smaller than the lower limit of the target subcooling degree range, the heating flow rate of the refrigerant is reduced. For example, if the actual subcooling degree is Ta = 6.7℃ and the target subcooling degree range Tb = [6.8℃, 7.2℃], then the actual subcooling degree of the refrigerant is too small because the actual subcooling degree of the refrigerant is smaller than the target subcooling degree lower limit and reducing the heating flow rate of the refrigerant to affect the heat exchange of the evaporator so that the actual subcooling temperature of the refrigerant after adjustment can fall within the target subcooling range. In this case, since the temperature of the refrigerant entering the throttle valve may be lowered by reducing the heating flow rate of the refrigerant, the actual degree of subcooling of the refrigerant may be adjusted to be within the target subcooling range.

In one embodiment, when the actual degree of subcooling is greater than the upper limit of the target degree of subcooling range, or the actual degree of subcooling is less than the lower limit of the range of the target degree of subcooling, step S301 at a predetermined time interval (for example, 10 S to 30 S) ~ By performing step S305 to adjust the heating flow rate, it is possible to improve the heat exchange efficiency of the evaporator.

The control method of the naturally cooling machine room air conditioner provided by the embodiment of the present invention is a fast operation of the refrigerant pump through control of the first operating mode and the second operating mode of the naturally cooling machine room air conditioner when the naturally cooling machine room air conditioner is in the pump operation state. And stable cooling output time can be shortened, so that the operating efficiency of the naturally cooling machine room air conditioner in the pump operating state is improved, and the temperature in the machine room is conveniently controlled.

Referring to FIG. 7 , an embodiment of the present invention further provides a control apparatus 200 for a naturally cooling machine room air conditioner that performs the above method to control a naturally cooled machine room air conditioner.

Specifically, in the embodiment shown in FIG. 7 , the control device 200 includes a command acquisition module 210 , a first execution module 230 , a cold load acquisition module 250 , a second operation mode determination module 270 and and a second performing module 290 .

The command acquisition module 210 acquires a control command for causing the natural cooling machine room air conditioner to enter the pump operation state.

The first execution module 230 controls the natural cooling machine room air conditioner to operate in the first operation mode according to the control command. Here, in the first operating mode, the rotational speed of the condenser is adjusted to satisfy the first preset rotational speed range, the rotational speed of the refrigerant pump is adjusted to satisfy the second preset rotational speed range, and the opening degree of the throttle valve is 1 Including adjusting to satisfy the preset opening degree range.

The cooling load acquisition module 250 acquires the cooling load of the naturally cooling machine room air conditioner when the natural cooling machine room air conditioner satisfies a preset trigger condition in the first operation mode.

The second operation mode determination module 270 determines the second operation mode according to the cooling load. The second mode of operation is different from the first mode of operation.

The second execution module 290 controls the natural cooling machine room air conditioner to operate according to the second operation mode.

The control device 200 of the natural cooling machine room air conditioner provided by the embodiment of the present invention is a refrigerant pump through control of the first operation mode and the second operation mode of the natural cooling machine room air conditioner when the natural cooling machine room air conditioner is in the pump operation state. It improves the operating efficiency of the air conditioner in the natural cooling machine room when the pump is in operation and conveniently controls the temperature in the machine room by enabling the fast operation of the machine and shortening the stable cooling output time.

In the embodiment of the present invention, terms such as “mounting”, “connection”, “fixing” and the like should be interpreted in a broad sense unless otherwise clearly defined or limited. It may be, for example, a fixed connection and may be a detachable connection or an integral connection; may be a mechanical connection or an electrical connection; It can be a direct connection or an indirect connection through a medium in the middle, it can be a communication between the two elements, just a surface contact, or a surface contact connection through an intermediate medium. A person skilled in the art will be able to understand the specific meaning of the term in the embodiments of the present invention according to specific circumstances.

In the description of this specification, the description of reference terms such as “one embodiment”, “some embodiments”, etc. indicates that a specific feature, structure, material, or characteristic of the embodiment or exemplary description is at least one embodiment or example of the present invention. means included in In this specification, exemplary descriptions of the above terms are not necessarily included in the same embodiment or illustration. In addition, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or multiple embodiments or examples. In addition, a person skilled in the art may combine or combine different embodiments or examples and features of different embodiments or examples described herein without contradicting each other.

Claims (10)

A method for controlling a natural cooling machine room air conditioner, the method comprising:
The naturally cooling machine room air conditioner includes a condenser, a refrigerant pump, a throttle valve and an evaporator, the operating state of the naturally cooling machine room air conditioner includes a pump operating state, and when the naturally cooling machine room air conditioner is in a pump operating state, the condenser; The refrigerant pump, the throttle valve and the evaporator are sequentially connected to form an operating circuit,
The method is
acquiring a control command for causing the air conditioner of the naturally cooling machine room to enter a pump operation state;
In accordance with the control command, the naturally cooling machine room air conditioner is controlled to operate in a first operating mode, wherein the first operating mode adjusts the rotation speed of the condenser to satisfy a first preset rotation speed range, and the refrigerant pump adjusting the rotation speed of the throttle to satisfy a second preset rotation speed range, and adjusting the opening degree of the throttle valve to satisfy the first preset opening degree range;
acquiring a cooling load of the naturally cooling machine room air conditioner when the naturally cooling machine room air conditioner satisfies a preset trigger condition in the first operation mode;
determining a second operating mode according to the cooling load, wherein the second operating mode is different from the first operating mode; and
and controlling the naturally cooling machine room air conditioner to operate according to the second operation mode.
According to claim 1,
The first operating mode is
control the condensing fan of the condenser to operate at a first rotational speed, the first rotational speed being a rated rotational speed of the condensing fan;
control the refrigerant pump to operate at a second rotational speed, the second rotational speed being half of the rated rotational speed of the refrigerant pump;
and controlling the throttle valve to operate at a preset opening degree, and the preset opening degree is half of the rated opening degree of the throttle valve.
According to claim 1,
The preset trigger condition is
maintaining a time during which the naturally cooling machine room air conditioner operates in the first operation mode satisfies a preset time range;
The preset time range is greater than or equal to 5 minutes and less than or equal to 15 minutes.
According to claim 1,
The step of acquiring the cooling load of the air conditioner of the natural cooling machine room includes:
obtaining a current machine room temperature; and
determining the cooling load of the naturally cooling machine room air conditioner according to the current machine room temperature and the target temperature,
Determining the second operating mode according to the cooling load comprises:
According to the cooling load, the rotation speed of the condenser is adjusted to satisfy a third preset rotation speed range, the rotation speed of the refrigerant pump is adjusted to satisfy a fourth preset rotation speed range, and the throttle valve is opened A control method of a natural cooling machine room air conditioner, comprising the step of adjusting the degree to satisfy a second preset opening degree range.
According to claim 1,
After controlling the naturally cooling machine room air conditioner to operate according to the second operation mode, the method comprises:
obtaining an actual degree of subcooling of the refrigerant;
obtaining a comparison result between the actual subcooling degree and a target subcooling degree range; and
The control method of a natural cooling machine room air conditioner, characterized in that it further comprises the step of obtaining a heating flow rate of the refrigerant according to the comparison result.
6. The method of claim 5,
Acquiring the actual degree of subcooling of the refrigerant comprises:
obtaining the pressure of the refrigerant at the input end of the throttle valve;
determining a saturation temperature of the refrigerant according to the pressure;
obtaining a current temperature of the refrigerant; and
and determining an actual supercooling degree of the refrigerant according to the current temperature and the saturation temperature.
6. The method of claim 5,
The step of obtaining the heating flow rate of the refrigerant according to the comparison result is,
controlling the heating flow rate of the refrigerant to 0 when the actual degree of subcooling is within the range of the target degree of subcooling;
increasing the heating flow rate of the refrigerant when the actual subcooling degree is greater than an upper limit of the target subcooling degree range; and
and reducing the heating flow rate of the refrigerant when the actual degree of subcooling is less than the lower limit of the target subcooling range.
In the control device of a natural cooling machine room air conditioner,
a command acquisition module for acquiring a control command for allowing the air conditioner of the naturally cooling machine room to enter a pump operation state;
According to the control command, the naturally cooling machine room air conditioner is controlled to operate in a first operating mode, wherein the first operating mode adjusts the rotation speed of the condenser to satisfy a first preset rotation speed range, and rotates the refrigerant pump. a first performing module comprising adjusting the speed to satisfy a second preset rotational speed range, and adjusting the opening degree of the throttle valve to satisfy the first preset opening degree range;
a cold load acquisition module configured to acquire a cold load of the naturally cooled machine room air conditioner when the naturally cooled machine room air conditioner satisfies a preset trigger condition in the first operation mode;
a second operating mode determining module, configured to determine a second operating mode according to the cooling load, wherein the second operating mode is different from the first operating mode; and
and a second execution module for controlling the naturally cooling machine room air conditioner to operate according to the second operation mode.
In a natural cooling machine room air conditioner,
condenser;
a refrigerant pump connected to the condenser;
a throttle valve connected to the refrigerant pump;
an evaporator connected between the condenser and the throttle valve;
a heat exchanger connected between the refrigerant pump and the throttle valve; and
a controller electrically connected to the condenser, the refrigerant pump, the throttle valve, the evaporator, and the heat exchanger,
the controller includes a pump mode, wherein the condenser, the refrigerant pump, the heat exchanger, the throttle valve and the evaporator are sequentially connected to form an operation circuit when the controller is in the pump mode; The natural cooling machine room air conditioner, characterized in that the controller performs the control method of the natural cooling machine room air conditioner according to any one of claims 1 to 7 to control the naturally cooled machine room air conditioner.
10. The method of claim 9,
the natural cooling machine room air conditioner includes a compressor, the compressor being connected between the evaporator and the condenser; an intake solenoid valve is not installed between the compressor and the evaporator; The controller further includes a compressor mode, wherein when the controller is in the compressor mode, the evaporator, the compressor, the condenser and the throttle valve are sequentially connected to form an operation circuit.

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