KR20040052049A - Heating control method of heat pump system - Google Patents

Abstract

PURPOSE: A method for operating a heating overload of a heat pump type air conditioner is provided to reduce temperatures of discharge sides of compressors, thereby preventing the compressors from being overheated and improving the reliability of the compressors. CONSTITUTION: A first compressor and a second compressor are operated according to a heating load for a heating operation of a heat pump type air conditioner with detecting an outdoor temperature(S1,S2). The detected outdoor temperature is compared with a first set temperature(S3). If the detected outdoor temperature is higher than the first set temperature, only the first compressor is operated and an outdoor fan is operated in a weak wind mode(S4). If a set time passes in a state that only the first compressor is operated, the second compressor is stopped after being operated for a predetermined time(S5). If the detected outdoor temperature is lower than the first set temperature while higher than a second set temperature lower than the first set temperature, the first and second compressors and the outdoor fan are controlled according to an indoor temperature(S6,S7). If the indoor temperature is lower than a third set temperature, all the compressors are operated and the outdoor fan is operated in a strong wind mode(S8,S9).

Description

Heating overload operation method of heat pump type air conditioner {Heating control method of heat pump system}

The present invention relates to a heating overload operation method of a heat pump type air conditioner that can prevent the compressor from overheating, and in particular, prevents the compressor from overheating and causes abnormal noise of the refrigerant to be buried in the outdoor fan noise. The present invention relates to a heating overload operation method of a heat pump type air conditioner capable of reducing abnormal noise.

In general, an air conditioner includes a compressor for converting a gaseous refrigerant at low temperature and low pressure into a gaseous state refrigerant at high temperature and high pressure, and a condenser for converting a gaseous state refrigerant at high temperature and high pressure into a liquid refrigerant at medium temperature and high pressure. And an electronic expansion valve for changing the medium-temperature high-pressure liquid state refrigerant in the condenser into a low-temperature low-temperature liquid state refrigerant, and an evaporator for changing the low-temperature low-pressure liquid state refrigerant into a gaseous state refrigerant. The heat pump type air conditioner of the air conditioner includes a four-way valve that changes the flow path of the refrigerant according to the cooling / heating mode.

At this time, the heat pump type air conditioner is different from the role of the indoor heat exchanger and the outdoor heat exchanger according to whether the cooling / heating operation, the indoor heat exchanger and the outdoor heat exchanger in the heating mode, respectively, the role of the condenser and the evaporator, while in the cooling mode The indoor heat exchanger and the outdoor heat exchanger each serve as an evaporator and a condenser.

Of course, the heat pump type air conditioner further includes an indoor fan and an outdoor fan respectively installed on the indoor heat exchanger and the outdoor heat exchanger side such that the indoor heat exchanger and the outdoor heat exchanger exchange heat with the indoor air and the outdoor air, respectively.

In particular, recently, by using a plurality of compressors having different capacities in an air conditioner and a heat pump type air conditioner, the cooling and heating efficiency can be optimized by varying the capacity of the compressor operated according to the cooling load or the heating load. I can do it.

However, the conventional heat pump type air conditioner has an outdoor air and the outdoor heat exchanger in order to prevent the temperature of the outdoor heat exchanger from rising by increasing the temperature of the refrigerant discharged from the compressor when the outdoor temperature is higher than the set temperature during the heating operation. The outdoor fan is controlled to limit the heat exchange of the outdoor fan. When the outdoor fan is operated, the abnormal noise of the refrigerant which is not buried in the operating noise of the outdoor fan is heard by the user as the outdoor fan is stopped. have.

The present invention has been made to solve the problems of the prior art, a heat pump that can not only prevent the overheating of the compressor by reducing the operating noise of the compressor and the outdoor fan according to the outdoor temperature, but also reduce the abnormal noise of the refrigerant It is an object of the present invention to provide a heating overload operation method of an air conditioner.

1 is a block diagram showing a heat pump type air conditioner according to the present invention,

2 is a flowchart illustrating a heating overload operation method of a heat pump type air conditioner according to the present invention;

3 is a graph showing a blowout temperature of indoor air when the heat pump type air conditioner is operated with the heating overload of the present invention and the heating overload of the prior art;

4 is a graph showing the blowout temperature of the indoor air when the heat pump type air conditioner is operated in the first and second heating overloads according to the present invention, respectively.

<Explanation of symbols on main parts of the drawings>

11,12: 1st, 2nd Compressor 13: Four-way Valve

14: indoor heat exchanger 14a: indoor fan

15: expansion device 16: outdoor heat exchanger

16a: outdoor fan 17: accumulator

The heating overload operation method of the heat pump type air conditioner according to the present invention for solving the above problems is the first step of operating at least one compressor to change the refrigerant compression capacity according to the outdoor temperature, and in the first step According to the refrigerant compression capacity of the operated compressor has a second step of controlling the air volume of the outdoor fan to prevent overheating of the compressor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a heat pump type air conditioner according to the present invention, Figure 2 is a flow chart illustrating a heating overload operation method of the heat pump type air conditioner according to the present invention.

When the heat pump air conditioner according to the present invention is described with reference to the heating time as shown in Figure 1, a plurality of compressors (11, 12) for compressing the refrigerant into a gas refrigerant of high temperature and high pressure, and the compressor (11) (12) heats the refrigerant passing through the indoor air to condense it into a liquid refrigerant of medium temperature and high pressure, and also heats the indoor air to the indoor heat exchanger (14) and the indoor heat exchanger (14). (14a), an expansion device (15) for reducing the refrigerant having passed through the indoor heat exchanger (14) with a low temperature low pressure refrigerant, and a refrigerant having passed through the expansion device (15) by heat exchange with outdoor air for low temperature and low pressure. It comprises an outdoor heat exchanger (16) for evaporating with the gas refrigerant and an outdoor fan (16a) for blowing outdoor air to the outdoor heat exchanger (16) side.

Of course, the heat pump type air conditioner is installed at the front end of the compressor (11, 12) accumulator 17 for filtering the liquid refrigerant from the refrigerant flowing into the compressor (11, 12) side, and the compressor (11, 12) The four-way valve 13 is installed at the rear end side to switch the flow path of the refrigerant so that the refrigerant flows to the indoor heat exchanger 14 side during heating and the refrigerant flows to the outdoor heat exchanger 16 side when cooling. .

At this time, the compressor (11, 12) is composed of a first compressor (11) having a medium capacity different from the refrigerant compression capacity, and a second compressor (12) having a small capacity, the first and second compressors (11, 12) Each of the first and second compressors 11 and 12 operates so as to occupy 60% and 40% of the total refrigerant compression capacity so that the refrigerant compression capacity is 100% when the heating load is relatively large during the heating operation. For example, when the heating load is relatively small, only the first compressor 11 is operated so that the refrigerant compression capacity is 60%.

In particular, the heat pump type air conditioner includes at least one of the first and second compressors 11 and 12 to limit the heat exchange between the outdoor air and the outdoor heat exchanger 16 when the outdoor temperature is higher than the set temperature during the heating operation. The compressor is operated as well as being operated to adjust the air volume of the outdoor fan 16a, which is described below with reference to Table 1 below.

Driving mode Outdoor temperature Room temperature Refrigerant Compression Capacity Outdoor fan air volume First heating overload Above the first set temperature - 60% Breeze Second heating overload Below 1st set temperature Above 2nd set temperature Above the third set temperature 60% Breeze 3rd heating overload Below the third set temperature 100% gale Normal heating Below 2nd set temperature - On-time room temperature control

Specifically, the heat pump type air conditioner determines that excessive heat exchange action occurs from the outdoor air to the outdoor heat exchanger 16 when the outdoor temperature is greater than or equal to the first set temperature, thereby exchanging heat between the outdoor air and the outdoor heat exchanger 16. In addition, the first heating overload operation in which only the first compressor 11 is operated at the same time and the outdoor fan 16a is operated in a mild wind so that abnormal noise of the refrigerant is buried in the noise of the outdoor fan 16a. The mode is operated.

The heat pump type air conditioner determines that the heat exchange action occurs from the outdoor air to the outdoor heat exchanger 16 when the outdoor temperature is less than the first set temperature and is greater than the second set temperature. According to the second and third heating overload operation mode.

At this time, when the indoor temperature is greater than or equal to the third set temperature, only the first compressor 11 is operated and the outdoor fan 16a is operated in the second heating overload operation mode in which the low wind is operated, and the indoor temperature is the third set temperature. If less than the first and second compressors (11, 12) are all operated at the same time the outdoor fan (16a) is driven in a third heating overload operation mode is operated by strong wind.

Meanwhile, when the outdoor temperature is less than the second set temperature, the heat pump type air conditioner determines that a normal heat exchange action occurs from the outdoor air to the outdoor heat exchanger 16 and operates in the normal heating mode according to the room temperature control at the time.

In this case, the on-time room temperature control allows the at least one or more compressors of the first and second compressors 11 and 12 to be operated or stopped according to the indoor heating load, thereby reducing power consumption and providing comfort to the user. It is heating.

Looking at the operation of the present invention configured as described above are as follows.

2 is a flowchart illustrating a heating overload operation method of a heat pump type air conditioner according to the present invention.

First, in the first step, both the first and second compressors 11 and 12 are operated according to the heating load so that the heat pump type air conditioner is heated and simultaneously, and the outdoor temperature is measured (see S1 and S2).

Here, the first and second compressors 11 and 12 have refrigerant compression capacities of medium and small capacities, respectively, and both the first and second compressors are operated during initial operation of the heat pump type air conditioner.

In the second step, the outdoor temperature measured in the first step is compared with the first set temperature (see S3).

In this case, when the outdoor temperature is measured to be repeated to increase and decrease based on the first set temperature, if the outdoor temperature is repeated more than the set number of times during the set time, it is determined that the outdoor temperature is greater than or equal to the first set temperature.

In the third step, when the outdoor temperature is determined to be equal to or greater than the first set temperature in the second step, only the first compressor 11 is operated, and the outdoor fan 16a is operated by controlling the mild wind. )

That is, when the outdoor temperature is greater than or equal to the first set temperature, it is determined that excessive heat exchange is generated from the outdoor air to the outdoor heat exchanger 16 to increase the discharge side temperature of the compressor, thereby overheating the compressor. By reducing the air volume of the outdoor fan, not only the refrigerant discharge temperature of the compressor can be lowered, but also the abnormal noise of the refrigerant can be reduced.

In the fourth step, when the set time has elapsed while only the first compressor 11 is operated in the third step, the second compressor 12 is stopped after a predetermined time operation (see S5).

Here, when only the first compressor 11 is operated, oil on the side of the second compressor 12 is caused by the pressure unbalance between the first compressor 11 and the second compressor 12. Since the first and second compressors 11 and 12 are started at the same time, only the first compressor 11 is longer than a set time in order to prevent breakage due to lack of oil on the second compressor 12 side. When activated, the second compressor 12 is operated for a predetermined time to recover oil to the second compressor 12 side and then stops.

Meanwhile, in the second step, when the outdoor temperature is less than the first set temperature and is greater than or equal to the second set temperature lower than the first set temperature, the indoor temperature is measured and the first and second compressors 11 and 12 are measured according to the indoor temperature. And the operation of the outdoor fan 16a is controlled (see S6 and S7).

At this time, when the outdoor temperature is measured to repeat the rising and falling again on the basis of the second set temperature, if it is repeated more than the set number of times during the set time, it is determined that the outdoor temperature is between the first set temperature and the second set temperature. .

That is, when the outdoor temperature is between the first set temperature and the second set temperature, it is determined that excessive heat exchange action occurs in the outdoor air from the outdoor air to the outdoor heat exchanger 16 to increase the discharge side temperature of the compressor, thereby overheating the compressor. In order to consider the user's comfort, the indoor temperature is measured and the operation of the first and second compressors 11 and 12 and the outdoor fan 16a is adjusted according to the indoor temperature.

In detail, when the indoor temperature is greater than or equal to the third preset temperature, the user may feel comfortable enough, so that the first compressor 11 is operated and the outdoor fan 16a is operated with a mild wind, while the indoor temperature is reduced. If the temperature is less than 3, it is determined that the user cannot feel comfort, and both the first and second compressors 11 and 12 are operated, and the outdoor fan 16a is operated by the strong wind. (See S8 and S9.)

Therefore, when the room temperature is equal to or greater than the third set temperature, not only can the refrigerant discharge temperature of the compressor be lowered by reducing the refrigerant compression capacity of the compressor and the air volume of the outdoor fan, but also the abnormal noise of the refrigerant can be reduced. Is less than the third set temperature, it is possible to provide a comfortable heating to the user by increasing the refrigerant compression capacity of the compressor and the air volume of the outdoor fan.

3 is a graph illustrating a blowout temperature of indoor air when the heat pump type air conditioner is operated with the heating overload of the present invention and the heating overload operation of the prior art, and FIG. 4 is a heat pump type air conditioner according to the present invention. The first and second heating overload is a graph showing the blowing air temperature of the indoor air, respectively.

Here, when the heat pump type air conditioner is operated in the heating overload operation of the present invention and the conventional heating overload operation, looking at the ejection temperature of the indoor air discharged to the indoor side, respectively, the test results under the conditions according to Table 2 below. As shown in Fig. 1, the blowing temperature of indoor air is shown.

Refrigerant Compression Capacity Room temperature Outdoor temperature Indoor fan Outdoor fan Prior art 100% A ℃ Above the first set temperature gale On / Off operation The present invention 60% A ℃ Above the first set temperature gale Light wind driving

That is, when only the first compressor 11 is operated according to the heating overload operation of the present invention and the outdoor fan 16a is operated by being controlled by the weak wind, the first and second compressors according to the conventional heating overload operation ( 11 and 12 are both operated and at the same time the blower temperature of the indoor air is about 2 ° C higher than when the outdoor fan 16a is operated to repeat operation / stop according to the outdoor piping temperature. When the heating overload operation of the present invention can solve the indoor load more quickly than the heating overload operation of the prior art, it is possible to reduce the power consumption by about 40% by operating only one compressor.

On the other hand, the heat pump type air conditioner operates only the first compressor (11) such that when the heating overload operation of the present invention is 60% of the refrigerant compression capacity, and the outdoor fan (16a) so that heat exchange with outdoor air is limited Looking at the blowout temperature of the indoor air discharged to the room side when the operation is controlled by a mild wind, the test temperature under the conditions according to the following Table 3 shows the blowout temperature of the indoor air as shown in FIG.

Driving mode Refrigerant Compression Capacity Room temperature Outdoor temperature Indoor fan Outdoor fan First heating overload operation 60% Above the third set temperature Above the first set temperature gale Breeze Second heating overload operation 60% Below the third set temperature Below 1st set temperature Above 2nd set temperature A special lecture Breeze

That is, when the heat pump type air conditioner is operated in the first heating overload, the blowing temperature of the indoor air is about 57 ° C., and in the case of the second heating overload operation, the blowing temperature of the indoor air is about 41 ° C., which is comfortable enough for the user. Feel the sense.

The heating overload operation method of the heat pump type air conditioner according to the present invention configured as described above may reduce the discharge side temperature of the compressor because at least one compressor is operated so that the refrigerant compression capacity is changed according to the outdoor temperature. Since the compressor can be prevented in advance, the reliability of the compressor can be increased, and the air volume of the outdoor fan is adjusted according to the refrigerant compression capacity. Therefore, the compressor and the outdoor fan are operated at the same time. Invisible to the user, there is an advantage to increase the reliability of the product.

Claims (8)

A first step of operating at least one compressor to change the refrigerant compression capacity according to the outdoor temperature; The heating overload operation method of the heat pump type air conditioner, characterized in that the second step of adjusting the air volume of the outdoor fan to prevent overheating of the compressor according to the refrigerant compression capacity of the compressor operated in the first step. The method of claim 1, At least one compressor of the first compressor having a medium capacity of the refrigerant compression capacity and the second compressor having a small capacity of the refrigerant compression capacity is operated in the first step, the heating overload operation method of the heat pump type air conditioner. The method of claim 2, The second step is the heating overload operation method of the heat pump type air conditioner, characterized in that only the first compressor is operated when the outdoor temperature is above the first set temperature. The method of claim 3, wherein The second step is the heating overload operation method of the heat pump type air conditioner, characterized in that at least one compressor is operated according to the change in the indoor temperature when the outdoor temperature is less than the second set temperature lower than the first set temperature. The method of claim 4, wherein In the second step, when the outdoor temperature is between the first set temperature and the second set temperature, only the first compressor is operated when the indoor temperature is above the set temperature, and when the indoor temperature is lower than the set temperature, both the first and second compressors are operated. Heating overload operation method of the heat pump type air conditioner, characterized in that. The method of claim 5, wherein The second step is a heat pump type air conditioning, characterized in that the outdoor fan is operated in a mild wind when only the first compressor is operated, and the outdoor fan is operated in a strong wind when both the first and second compressors are operated. Heating overload operation of the machine. The method of claim 6, In the first step, when the outdoor temperature rises and falls based on the first set temperature or the second set temperature by more than a set number of times during the set time, it is determined that the outdoor temperature is greater than the first set temperature or the second set temperature, respectively. Heating overload operation method of a heat pump type air conditioner. The method of claim 6, The second step is the heating overload of the heat pump type air conditioner characterized in that the second compressor is stopped after a predetermined time to recover the oil to the second compressor when only the first compressor is operated for a predetermined time or more. How to operate.