KR100696121B1 - Method for defrosting of Air conditioner for simultaneously heating and cooling - Google Patents

Abstract

The present invention relates to a heating and cooling air conditioner, the cooling and heating air conditioner of the present invention, when the defrost operation event occurs during the heating operation, the compressor is stopped and the high-temperature refrigerant flowing out from the indoor heat exchanger by opening the electronic expansion valve to the outdoor heat exchanger It is implemented to perform the defrosting operation by flowing smoothly.

Accordingly, the heating and cooling air conditioner according to the present invention can perform defrosting operation at the moment when frost occurs in the outdoor heat exchanger during heating operation, thereby shortening the operation cycle and improving heating capability. Furthermore, the air-conditioning and air conditioner according to the present invention does not control the refrigerant flowing from the four-way valve from the compressor to the outdoor heat exchanger during the defrosting operation. By controlling the flow to the heat exchanger, the indoor heat exchanger is operated as the evaporator during the defrosting operation to solve the conventional problem that the heating capacity of the air conditioner is sharply lowered.

Air-conditioning and air conditioning unit, defrosting operation, outdoor unit, indoor unit, electronic expansion valve, four-way valve

Description

Method for defrosting of air conditioner for simultaneously heating and cooling

1 is a view showing a change in heating capacity according to a defrosting operation of a conventional air conditioning air conditioner.

Figure 2 schematically shows the configuration of the air conditioning air conditioner used in the present invention,

   Figure 2a shows the flow of the refrigerant during the heating operation.

   Figure 2b shows the flow of the refrigerant during the cooling operation.

3 is a view showing a change in heating capacity according to the defrosting operation of the air conditioning air conditioner according to the present invention.

4 is a defrosting operation flowchart of a cooling and heating air conditioner according to the present invention.

The present invention relates to a heating and cooling air conditioner, and more particularly to a heating and cooling air conditioner that can enhance the heating capacity during defrosting operation.

In general, an air conditioner is a device for cooling or heating an indoor space such as a living space, a restaurant, or an office. In order to satisfy various needs of users, such air conditioners are widely used in air conditioning and heating air conditioners, which are capable of both cooling operation and heating operation.

In general, the air conditioner of the heating / cooling air conditioner uses an outdoor heat exchanger as an evaporator during the heating operation, and thus, if the outdoor temperature becomes too low, the surface temperature of the outdoor heat exchanger drops below zero. Thus, conventionally, the moisture contained in the outdoor air is frosted on the surface of the outdoor heat exchanger is cold, the heat exchange capacity of the outdoor heat exchanger is reduced. In order to solve this problem, the conventional air conditioning and air conditioner has been implemented to perform a defrosting operation during the heating operation. In other words, the conventional air-conditioning and air conditioner defrosts the outdoor heat exchanger when the heating capacity is lowered, that is, the high-temperature gas refrigerant flowing from the compressor to the indoor heat exchanger flows to the outdoor heat exchanger, whereby the outdoor heat exchanger is operated as a condenser. Was implemented.

On the other hand, conventionally, various methods have been proposed to determine when to perform the defrosting operation during the heating operation. First of all, there is a method to calculate the temperature at which frost occurs in the outdoor heat exchanger experimentally by simultaneously measuring the outdoor temperature and the outdoor tube temperature at the same time, and to determine the need for defrosting operation. However, in actual situation, when the outdoor heat exchanger is implanted, the inflow of air to the temperature sensor that senses the outdoor temperature is blocked, and the outdoor temperature is lower than the actual temperature due to the radiation and natural convection effect caused by frost generated in the outdoor heat exchanger. Done. That is, distortion occurs between the actual outdoor temperature and the outdoor temperature measured by the temperature sensor, and thus does not give accurate defrosting operation information. Therefore, the conventional air-conditioning and air conditioner has been implemented to perform the defrosting operation periodically at the time when the heating capacity is low during the heating operation.

1 is a view showing a change in heating capacity according to the defrosting operation of a conventional air-conditioning and air conditioner. As shown in FIG. 1, the defrosting method of a conventional air-conditioning and air conditioner is implemented to perform a defrosting operation for about 10 minutes in an hour of heating operation. However, as shown, when the conventional air conditioning air conditioner performs the defrosting operation during the heating operation, it can be seen that the indoor heat exchanger is operated as the evaporator by controlling the four-way valve, the heating capacity is sharply reduced. Therefore, the conventional air-conditioning air conditioner user has a problem that the heat discomfort during heating operation.

Accordingly, the present invention has been proposed to solve the above problems, an object of the present invention is to improve the heating capacity by having a defrost function for the outdoor heat exchanger during the heating operation without converting the heating operation to the cooling operation for the defrosting operation. It is.

An additional object of the present invention is to provide a technology capable of shortening the operation cycle while improving the heating capacity by performing defrosting at the moment when frost starts to occur in the outdoor heat exchanger during the heating operation.

According to an aspect of the present invention, an air conditioning and air conditioner according to an aspect of the present invention stops a compressor when a defrosting operation event occurs at the moment when frost occurs in a pipe of an outdoor heat exchanger due to temperature sensing during heating operation. The electronic expansion valve is opened to allow the high temperature refrigerant flowing out of the indoor heat exchanger to flow to the outdoor heat exchanger to perform defrosting operation.

According to this aspect, the air-conditioning air conditioner according to the present invention during the defrosting operation, by converting the heating operation to the cooling operation by switching the four-way valve as in the prior art by utilizing the outdoor heat exchanger as a condenser without defrosting the outdoor heat exchanger In the heating operation, the compressor is stopped at the moment when frost occurs in the pipe of the outdoor heat exchanger so that the high temperature refrigerant of the indoor heat exchanger flows to the outdoor heat exchanger side.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

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Figure 2 schematically shows the configuration of the air conditioning air conditioner used in the present invention, Figure 2a shows the flow of the refrigerant during the heating operation, Figure 2b shows the flow of the refrigerant during the cooling operation.

As shown, the heating and cooling air conditioner of the present invention is largely comprised of the indoor unit 10, the outdoor unit 20, and the control unit 30.

The indoor unit 10 indoors an indoor heat exchanger (IDU HEX) 11 that handles heat exchange between indoor air and a refrigerant, and air cooled by the indoor heat exchanger (IDU HEX) 11. It includes a circulation fan 12 to discharge to.

The outdoor unit 20 includes a compressor 21 for compressing and forcibly circulating refrigerant, an outdoor heat exchanger (ODU HEX) 22 for processing heat exchange between the refrigerant flowing from the compressor 21 and outdoor air, and the outdoor unit. The compressor 21 according to the operation expansion signal from the electromagnetic expansion valve 23, the blower fan 24, and the controller 30, which lowers and discharges the pressure of the refrigerant flowing from the heat exchanger (ODU HEX) 22. Four-way valve 25 is driven to flow the refrigerant from the IDU HEX (11) or the outdoor heat exchanger (ODU HEX) 22, and a temperature sensor for measuring the outdoor temperature and the outdoor piping temperature ( 26 and 27, and a liquid separator 28 separating the incoming refrigerant into the refrigerant gas and the refrigerant liquid to suck only the separated refrigerant gas into the compressor 21.

The controller 30 controls the operation of the entire system, and preferably includes a microprocessor including ROM, RAM, and peripheral circuits, and additional circuits that perform various functions. The control unit 30 performs the cooling and heating operation, the defrosting operation, and further the dehumidification operation according to the operation signal input from the operation unit 31.

Hereinafter, the flow of the refrigerant during the operation of the air-conditioning and air conditioner used in the present invention will be described with reference to the drawings.

Referring first to Figure 2a, the air-conditioning air conditioner used in the present invention is a refrigerant during the heating operation compressor 21 → four-way valve 25 → indoor heat exchanger (IDU HEX) (11) → electromagnetic expansion valve (23) → An outdoor heat exchanger (ODU HEX) 22 → four-way valve 25 → liquid separator 28 → compressor 21 is implemented to flow. During the heating operation, the indoor heat exchanger (IDU HEX) 11 is a condenser that condenses the high pressure and high temperature gaseous refrigerant into the high pressure and high temperature liquid refrigerant. It is driven by an evaporator which evaporates to a low temperature gaseous refrigerant.

Referring to Figure 2b, the cooling and air-conditioning air conditioner used in the present invention is a refrigerant during the cooling operation compressor 21 → four-way valve 25 → outdoor heat exchanger (ODU HEX) 22 → electromagnetic expansion valve 23 → indoor The heat exchanger (IDU HEX) 11 → the first four-way valve 25 → liquid separator 28 → the compressor 21 is implemented to flow. During the cooling operation, the outdoor heat exchanger (ODU HEX) 22 is a condenser that condenses the high temperature and high pressure gaseous refrigerant into low temperature and high pressure liquid refrigerant, and the indoor heat exchanger (IDU HEX) 11 stores the low temperature and low pressure liquid refrigerant at low temperature. It is driven by an evaporator which evaporates to a low pressure gaseous refrigerant.

Meanwhile, in the related art, during the defrosting operation during the heating operation, the four-way valve 25 is controlled so that the refrigerant flows from the compressor 21 to the outdoor heat exchanger (ODU HEX) 22. In this defrosting operation, the indoor heat exchanger (IDU HEX) 11 is operated as an evaporator, so that the heating and cooling air conditioner is inferior in heating capacity. However, according to a characteristic aspect of the present invention, if a defrosting operation event occurs when the frost starts to occur in the pipe of the outdoor heat exchanger during the heating operation, the compressor is stopped and the incoming refrigerant is discharged without change in pressure. Defrosting is performed by the high temperature refrigerant flowing out of the indoor heat exchanger by driving the expansion valve, thereby solving the conventional problem that the indoor heat exchanger is operated as an evaporator during the defrosting operation and the heating capacity of the air conditioner is rapidly lowered.

Hereinafter, the change of the heating capacity according to the defrosting operation of the air conditioning and air conditioner according to the present invention will be described with reference to the drawings.

3 is a view showing a change in the heating capacity according to the defrosting operation of the air conditioning air conditioner according to the present invention.

As described above, the cooling and heating air conditioner according to the present invention causes the refrigerant flowing out of the compressor to flow to the indoor heat exchanger in the same manner as in the heating operation even in the defrosting operation as described above. It is to solve the problem of suspension, and to minimize the deterioration of heating capacity while performing defrosting.

Furthermore, although the heating and cooling air conditioner according to the present invention has a shorter defrosting operation cycle, the time required for defrosting as a defrosting operation event when the frost starts to occur in the piping of the outdoor heat exchanger is also shortened, so that the heating operation state can be maintained even during defrosting. Will be.

Hereinafter, the defrosting operation performed by the controller 30 will be described with reference to the accompanying drawings. 4 is a defrosting operation flowchart of a cooling and heating air conditioner according to the present invention.

First, the control unit 30 controls the heating and cooling air conditioner of the present invention to perform the heating operation according to the user's operation signal (S101).

Thereafter, the controller 30 checks whether a defrosting operation event occurs during the heating operation. In one embodiment, the determination of whether the defrosting operation event occurs by measuring the outdoor temperature and the outdoor pipe temperature after a predetermined time (S102, S103), based on the measured outdoor pipe temperature and the outdoor temperature measured before a predetermined time. It may be made in a manner to determine whether the defrost operation is necessary (S104). In one embodiment, the determination of the need for defrosting operation is to compare the outdoor pipe temperature and the current outdoor pipe temperature corresponding to the outdoor temperature measured before a certain time and if the comparison value is within the limited range defrost operation is required in the outdoor heat exchanger. You can judge. The relationship with the outdoor pipe temperature corresponding to the outdoor temperature during the heating operation can be obtained through experiments in advance.

In another embodiment, the determination of whether the defrosting operation event occurs may be implemented by confirming the occurrence of the event that the outdoor pipe temperature input from the temperature sensor reaches the defrost inrush temperature. Here, the relationship between the outdoor piping temperature and the defrost inrush temperature can be obtained through experiments in advance. Here, the defrost inrush temperature is preferably set to the outdoor outdoor piping temperature at the moment when frost starts to occur in the outdoor heat exchanger during the heating operation.

Thereafter, when the defrosting operation event occurs, the controller 30 stops the operation of the compressor and performs the dehumidification operation steps of driving the electronic expansion valve (S105 and S106) so that the refrigerant flowing therein without changing the pressure. The air-conditioning and air conditioner according to the present invention allows the refrigerant flowing out of the compressor to flow to the indoor heat exchanger during the defrosting operation as in the heating operation, thereby switching the cooling operation from the indoor heat exchanger to the cooling operation by the four-way valve during the conventional defrosting operation. It is to solve the problem that the air is discharged.

In one embodiment, the dehumidification operation step may further comprise the step of stopping the driving of the circulation fan and the blowing fan (S107). This is to stop the operation of the circulation fan and the blower fan during the defrosting operation so that the indoor heat exchanger and the outdoor heat exchanger operated as a condenser perform defrosting more effectively and at the same time minimize the deterioration of the heating capacity.

Thereafter, the control unit 30 checks whether the defrosting operation termination event has occurred (S108). In one embodiment, the defrosting operation end event may be the arrival of a set defrosting operation end time, or may be various events such as a defrosting operation start temperature input from a temperature sensor installed in an outdoor unit.

Thereafter, when the defrosting operation end event occurs, the controller 30 performs the heating operation again. That is, the electronic expansion valve is driven to lower the pressure of the refrigerant flowing therein and flows out, and the compressor and the fan are driven (S109 and S110).

Thereafter, the controller 30 checks whether a system termination signal is input (S111). The controller 30 repeats the step S101 of performing the heating operation if the system end signal is not input as a result of the check, otherwise terminates the system.

As described in detail above, the air-conditioning air conditioner according to the present invention performs defrosting operation at the moment when frost starts to occur in the outdoor heat exchanger during heating operation, thereby shortening the operation cycle and the defrosting time and improving heating capacity at the same time. It has a useful effect.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Therefore, it should be interpreted by the claims described to include many such variations.

Claims (4)

An indoor unit including an indoor heat exchanger and a circulation fan, an outdoor unit including a compressor for compressing and forcibly circulating refrigerant, an outdoor expansion valve including an electronic expansion valve, a blower fan, and a four-way valve for changing the refrigerant flow according to operating conditions, and In the defrosting operation method executable in the control unit of the air-conditioning and air conditioning unit including a control unit, Checking whether a defrosting operation event occurs at the instant when frost starts to occur in the pipe of the outdoor heat exchanger due to the temperature sensing during the heating operation; A defrosting operation step of stopping the driving of the compressor when the defrosting operation event occurs and driving the electromagnetic expansion valve to flow out the refrigerant flowing therein without changing the pressure; Defrosting operation method comprising a. The method of claim 1, wherein the defrosting step is: Stopping driving of the circulation fan and the blowing fan; Defrosting operation method further comprising. According to claim 1 or 2, wherein the outdoor unit comprises a temperature sensor for measuring the indoor piping temperature, The step of checking whether the defrost operation event occurs is: Defrosting operation method characterized in that the step of confirming the occurrence of the event that the outdoor outdoor pipe temperature input from the temperature sensor reaches the defrost inrush temperature at the moment when the frost starts to occur. According to claim 1 or 2, wherein the outdoor unit includes a first temperature sensor for measuring the outdoor temperature, and a second temperature sensor for measuring the indoor piping temperature, The step of determining whether the defrost operation event occurs: Measuring an outdoor temperature through the first temperature sensor; Measuring an outdoor pipe temperature through the second temperature sensor after a predetermined time elapses; Determining whether a defrosting driving event occurs at the moment when frost starts based on the measured outdoor pipe temperature and the outdoor temperature measured before a predetermined time; Defrosting operation method comprising a.

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