KR20060086761A - Airconditioning apparatus for combined use of cooler and heater - Google Patents

Abstract

The present invention relates to an air conditioner for both heating and cooling, and is used as a condenser for condensing a refrigerant of a high temperature and high pressure compressed by the compressor 31 in a cooling operation mode and a medium temperature high pressure refrigerant in a cooling operation mode. In the mode, the outdoor heat exchanger 32 is used as an evaporator for evaporating the refrigerant to low temperature and low pressure gas, and in the cooling operation mode, it is used as an evaporator for evaporating the refrigerant to low temperature and low pressure gas. An expansion that is installed between the indoor heat exchanger 41 and the outdoor heat exchanger 32 and the indoor heat exchanger 41 that is used as a condenser for condensing the compressed high temperature and high pressure refrigerant into a medium temperature high pressure refrigerant. An outdoor blower fan 35 for forcibly blowing air around the outdoor heat exchanger 32 so that the heat exchanger of the mechanism 33 and the outdoor heat exchanger 32 is smoothly performed, and a blower fan ( 35) is variablely rotated, but in the heating operation mode comprises a fan driving device for rotating at a reduced speed than in the cooling operation mode. According to the present invention, it is possible to obtain a high cooling performance coefficient (COP) in the heating operation mode by varying the rotational speed of the outdoor blower fan 35 in accordance with the operation mode of cooling or heating.

HVAC, indoor unit, outdoor unit, outdoor blower, variable speed

Description

Air-conditioning apparatus for combined use of cooler and heater}

1 is a view schematically showing a configuration of a conventional air-conditioning combined air conditioner.

Figure 2 is a schematic view showing a cooling and heating air conditioning apparatus according to a preferred embodiment of the present invention.

3 is a graph for explaining the operation of the outdoor blower fan of the air conditioning and air conditioning apparatus according to a preferred embodiment of the present invention shown in FIG.

Figure 4 is a graph showing the operation and effect of the air-conditioning combined air conditioning apparatus according to a preferred embodiment of the present invention shown in FIG.

Figure 5 is a schematic view showing a cooling and heating air conditioning apparatus according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

30,50; outdoor 40, 60; indoor

Compressor 32,52 outdoor heat exchanger

33, 53; expansion mechanism 34, 54; outdoor blower

35,55; Outdoor blower fan 36; Variable motor

Indoor Heat Exchanger 42,62 Indoor Blower                 

56; motor 57; inverter

The present invention relates to an air conditioning and air conditioning apparatus capable of both cooling and heating, and more particularly, by controlling the rotational speed of an outdoor blower fan differently in a cooling operation mode and a heating operation mode, a cooling and heating performance coefficient in a heating operation mode (COP). It is related with the air-conditioning apparatus for combined heating and heating.

In general, the air conditioner includes both an air conditioner that cools indoor air and a heater that heats indoor air. Recently, a combined air conditioning and air conditioner capable of cooling and heating in one system has been put to practical use.

1 is a view schematically showing a conventional air-conditioning combined air conditioner.

As shown in FIG. 1, the conventional air conditioning and air conditioner is composed of an outdoor unit 10 that is installed outdoors and an indoor unit 20 that is installed indoors.

The outdoor unit 10 includes a compressor 11 for compressing the vaporized refrigerant to high temperature and high pressure, an outdoor heat exchanger 12 connected to the compressor 11 and allowing the refrigerant to exchange heat with the outdoor air, and the outdoor heat exchanger 12. An outdoor blower fan 13 for forcibly blowing the outdoor air to promote heat exchange of the refrigerant flowing in the outdoor heat exchanger 12, and an expansion mechanism 14 connected to the outdoor heat exchanger 12 and thermally expanding the refrigerant. Include.

The indoor unit 20 is connected to the compressor 11 and the expansion mechanism 14 and the indoor heat exchanger 21 for allowing the refrigerant to exchange heat with the indoor air, and the indoor heat exchanger by forcibly blowing the indoor air around the indoor heat exchanger 22. And an indoor blower 22 for promoting heat exchange of the refrigerant flowing in the apparatus 21.

In the conventional air conditioning and air conditioning apparatus having such a configuration, the refrigerant flows along the compressor 11, the outdoor heat exchanger 12, the expansion mechanism 14, and the indoor heat exchanger 21 to form a series of refrigerant cycles, and the cooling operation mode. In the outdoor heat exchanger 12 to function as a condenser and the indoor heat exchanger 21 to function as an evaporator.

Looking at the operation of the air conditioner, the refrigerant is compressed in the compressor 11 is discharged toward the outdoor heat exchanger (12). The high temperature and high pressure gas refrigerant discharged from the compressor 11 is condensed into the medium temperature and high pressure liquid refrigerant through heat exchange with the outdoor air while passing through the outdoor heat exchanger 12. At this time, the outdoor blower fan 13 forcibly blows air around the outdoor heat exchanger 12 so that heat exchange of the refrigerant passing through the outdoor heat exchanger 12 is actively performed, thereby improving the cooling performance of the air conditioning apparatus.

The liquid refrigerant condensed while passing through the outdoor heat exchanger 12 is converted into a liquid refrigerant of low temperature and low pressure while flowing through the expansion mechanism 14 and flows toward the indoor heat exchanger 21. In the indoor heat exchanger 21, the low temperature low pressure liquid refrigerant is converted into a low temperature low pressure gas refrigerant to lower the ambient temperature. At this time, the indoor blower 22 improves the heating performance of the air conditioning apparatus by forcibly blowing air around the indoor heat exchanger 21 so that heat exchange of the refrigerant passing through the indoor heat exchanger 21 is actively performed.

On the other hand, in the heating and operation combined air conditioning apparatus having the above configuration in the heating operation mode, the outdoor heat exchanger 12 to function as the evaporator and the indoor heat exchanger 21 to function as a condenser, the operation is as follows. .

The refrigerant circulating in the refrigerant cycle is compressed at a high temperature and high pressure in the compressor 11 and discharged toward the indoor heat exchanger 21. In the indoor heat exchanger 21, the refrigerant heats indoor air while heat-exchanging with the indoor air. At this time, the indoor blower 22 forcibly blows air around the indoor heat exchanger 21 to promote heat exchange between the refrigerant passing through the indoor heat exchanger 21 and the indoor air.

The refrigerant converted into a medium temperature high pressure liquid while passing through the indoor heat exchanger 21 is converted into a liquid refrigerant of low temperature and low pressure while flowing through the expansion mechanism 14 of the outdoor unit 10 and flows to the outdoor heat exchanger 12. The refrigerant in the outdoor heat exchanger 12 exchanges heat with the outdoor air around the outdoor heat exchanger 12 while being converted into a gas refrigerant having a low temperature and low pressure. When the heat exchanger between the refrigerant and the outdoor air is exchanged in the outdoor heat exchanger 12, the outdoor blower fan 13 forcibly blows the outdoor air around the outdoor heat exchanger 12 to promote heat exchange of the outdoor heat exchanger 12. .

However, in the conventional air conditioning and air conditioning apparatus, the outdoor heat exchanger 12 emits heat to the surroundings in the cooling operation mode and absorbs heat from the outdoor air in the heating operation mode. The outdoor blower fan 13 rotates at a constant speed even though the degree of heat exchange of the refrigerant is different. Since the rotational speed of the outdoor blower fan 13 is set in accordance with the cooling operation in which the outdoor heat exchanger 12 functions as a condenser, the heating and cooling coefficient of the air conditioner (COP: Coefficient Of Performance) There is a problem that cannot be improved.

The present invention has been made in view of the above problems, by controlling the rotational speed of the outdoor blower fan in the cooling operation mode and heating operation mode to improve the air conditioning performance coefficient (COP) in the heating operation mode The purpose is to provide a device.

The air conditioning and air conditioning apparatus according to the present invention for achieving the above object is used as a compressor for compressing a refrigerant, and in a cooling operation mode, used as a condenser to condense the high temperature and high pressure refrigerant compressed by the compressor into a medium temperature and high pressure refrigerant. The outdoor heat exchanger used as an evaporator for evaporating refrigerant to low temperature and low pressure gas in the mode, the evaporator for evaporating refrigerant to low temperature low pressure gas in the cooling operation mode and the high temperature and high pressure refrigerant compressed in the compressor in the heating operation mode. An indoor heat exchanger used as a condenser for condensing the medium into a high pressure refrigerant, an expansion mechanism installed between the outdoor heat exchanger and the indoor heat exchanger to adiabaticly expand the refrigerant, and the heat exchanger of the outdoor heat exchanger to perform smoothly. Sealing forced air around the outdoor heat exchanger An external blowing fan and a fan driving device for rotating the blowing fan variably but at a reduced rotational speed than in the cooling operation mode in the heating operation mode.

According to the present invention having such a configuration, by varying the rotational speed of the outdoor blower fan in accordance with the operation mode of cooling or heating, it is possible to obtain a high cooling performance coefficient (COP) even when the heating operation mode is changed.

Here, the fan driving apparatus of the air conditioning and air conditioning apparatus according to the present invention may be a variable motor whose rotational speed is variable, or may include a motor and an inverter for varying the rotational speed of the motor.

The air conditioning and air conditioning apparatus according to the present invention may further include an indoor blower for forcibly blowing indoor air around the indoor heat exchanger such that heat exchange of the refrigerant is actively performed in the indoor heat exchanger.

Hereinafter, with reference to the accompanying drawings will be described for the air conditioning and air conditioning apparatus according to a preferred embodiment of the present invention.

Figure 2 is a schematic view showing a combined air conditioning and air conditioner according to a preferred embodiment of the present invention, Figure 3 is an operation of the outdoor blowing fan of the air conditioning and air conditioning apparatus according to a preferred embodiment of the present invention shown in FIG. Figure 4 is a graph for explaining, and Figure 4 is a graph showing the operation and effect of the air conditioning and air conditioning apparatus according to a preferred embodiment of the present invention shown in FIG.

As shown in Figure 2, the air conditioning combined air conditioning apparatus according to a preferred embodiment of the present invention consists of an outdoor unit 30 installed indoors and an indoor unit 40 installed indoors, the outdoor unit 30 and the indoor unit ( In 40, one connected refrigerant cycle is formed.

The outdoor unit 30 includes a compressor 31 for compressing a refrigerant at high temperature and high pressure, an outdoor heat exchanger 32 for exchanging the refrigerant with outdoor air, an expansion mechanism 33 for thermally expanding the refrigerant, and an outdoor heat exchanger ( 32) an outdoor blower 34 for forcibly blowing the surrounding outdoor air to promote heat exchange of the outdoor heat exchanger 32.

The compressor 31 compresses the vaporized gas refrigerant to high temperature and high pressure and discharges the vaporized gas refrigerant to the indoor heat exchanger 41 provided in the outdoor heat exchanger 32 or the indoor unit 40 according to the operation mode. In the cooling operation, the compressor 31 discharges the compressed refrigerant to the outdoor heat exchanger 32, and in the heating operation, the compressor 31 discharges the high temperature and high pressure refrigerant to the indoor heat exchanger 41.

The outdoor heat exchanger 32 is connected to the compressor 31 and is configured to exchange heat with outdoor air while a refrigerant flows therein. The outdoor heat exchanger 32 functions as a condenser or an evaporator according to the operation mode. That is, the outdoor heat exchanger 32 converts the high temperature and high pressure gas refrigerant compressed by the compressor 31 into the medium temperature high pressure liquid refrigerant during the cooling operation, and the medium temperature high pressure passed through the expansion mechanism 33 during the heating operation. To convert the liquid refrigerant into a low temperature low pressure gas refrigerant.

The expansion mechanism 33 is connected to the outdoor heat exchanger 32, and a capillary tube or various types of expansion valves are used as components for adiabatic expansion of the condensed refrigerant to promote vaporization of the refrigerant. The expansion mechanism 33 converts the refrigerant condensed at medium temperature and high pressure in the outdoor heat exchanger 32 into a liquid refrigerant having a low temperature and low pressure during cooling operation, and transfers the refrigerant to the indoor unit 40, and during the heating operation, the indoor heat exchanger 41. The refrigerant condensed in) is converted into a liquid refrigerant having a low temperature and low pressure, and then transferred to the outdoor heat exchanger 32.

The outdoor blower 34 is a component for forcibly blowing outdoor air around the outdoor heat exchanger 32 so that heat exchange of the refrigerant passing through the outdoor heat exchanger 32 is actively performed. It includes a variable motor 36 for rotating the outdoor blowing fan (35). As shown in FIG. 3, in the cooling operation mode, the variable motor 36 rotates the outdoor blowing fan 35 at a high rotational speed of V ₁ , and in the heating operation mode, the variable motor 36 is the outdoor blowing fan 35. Rotate at the rotation speed of V _{2 which} is slower than cooling operation mode.

The indoor unit 40 includes an indoor heat exchanger 41 for allowing the refrigerant to exchange heat with the indoor air, and an indoor blower 42 for forcibly blowing the indoor air around the indoor heat exchanger 41.

The indoor heat exchanger 41 is connected to the expansion mechanism 33 and the compressor 31, and functions as an evaporator in the cooling operation mode and a condenser in the heating operation mode. That is, during the cooling operation, the indoor heat exchanger 41 cools the room by taking heat around the indoor heat exchanger 41 while converting the low temperature and low pressure liquid refrigerant transferred from the expansion mechanism 33 into the low temperature low pressure gas refrigerant. In the heating operation, the indoor heat exchanger 41 heats the room by dissipating heat into the room at a high temperature and high pressure refrigerant transferred from the compressor 31.

The indoor blower 42 forcibly blows indoor air around the indoor heat exchanger 41 to allow the refrigerant flowing in the indoor heat exchanger 41 to actively exchange heat with the indoor air.

Hereinafter, the operation of the air conditioning and air conditioning unit according to a preferred embodiment of the present invention having the above configuration will be described by dividing the cooling operation mode and the heating operation mode.                     

First, during the cooling operation, the refrigerant circulates in the solid arrow direction in the refrigerant cycle shown in FIG. 2, and the refrigerant compressed at a high temperature and high pressure in the compressor 31 flows to the outdoor heat exchanger 32. The refrigerant having a high temperature and high pressure in the outdoor heat exchanger 32 condenses to medium temperature and high pressure while dissipating heat to the outside by exchanging heat with air around the outdoor heat exchanger 32. At this time, the outdoor blower fan 35 is rapidly rotated at a speed of V ₁ while forcibly blowing air around the outdoor heat exchanger 32 while passing through the outdoor heat exchanger 32 as shown in FIG. 3. Promote heat exchange.

Subsequently, the refrigerant converted into the medium-temperature high-pressure liquid refrigerant in the outdoor heat exchanger 32 is adiabaticly expanded while passing through the expansion mechanism 33 and converted into the liquid refrigerant of the low temperature low pressure, and then the indoor heat exchanger 41 of the indoor unit 40. Flows). In the indoor heat exchanger 41, the low temperature low pressure liquid refrigerant evaporates into a low temperature low pressure gas refrigerant to extract heat from the indoor air around the indoor heat exchanger 41 to cool the room. At this time, the indoor blower 42 forcibly blows indoor air around the indoor heat exchanger 41 to promote heat exchange of the refrigerant passing through the indoor heat exchanger 41.

As described above, in the cooling operation mode in which the refrigerant cools the room while circulating the compressor 31, the outdoor heat exchanger 32, the expansion mechanism 33, and the indoor heat exchanger 41, the refrigerant is supplied in the outdoor heat exchanger 32. Lower the temperature and pressure of the better. This is because reducing the pressure difference between the refrigerant flowing in the indoor heat exchanger 41 and the refrigerant flowing in the outdoor heat exchanger 32 at a relatively low pressure can reduce the power consumption of the compressor 31.                     

Since the size of the outdoor heat exchanger 32 is constant, the rotational speed of the outdoor blower fan 35 is increased to V ₁ as shown in FIG. 3 to increase the air blowing around the outdoor heat exchanger 32. The temperature and pressure of the refrigerant flowing in the heat exchanger 32 can be lowered. At this time, the power consumption of the motor for driving the variable motor 36 for rotating the outdoor blowing fan 35 is increased, but the power consumption of the compressor 31 is reduced to increase the cooling and heating performance coefficient (COP) of the air conditioning apparatus.

During the heating operation, the refrigerant circulates in the direction of the dotted arrow in the refrigerant cycle shown in FIG. 2. The high temperature and high pressure refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 41. The refrigerant compressed by the high temperature and high pressure in the indoor heat exchanger 41 emits heat to the indoor air around the indoor heat exchanger 41 to heat the room. At this time, the indoor blower 42 forcibly blows air around the indoor heat exchanger 41 to promote heat exchange of the refrigerant passing through the indoor heat exchanger 41.

The refrigerant condensed at medium temperature and high pressure by dissipating heat from the indoor heat exchanger 41 is thermally expanded by the liquid refrigerant of low temperature and low pressure while passing through the expansion mechanism 33. The refrigerant converted to the low temperature low pressure liquid refrigerant is vaporized by taking heat from the surrounding air in the outdoor heat exchanger 32. At this time, the outdoor blower fan 35 forcibly blows air around the outdoor heat exchanger 32 so that vaporization of the refrigerant occurs smoothly in the outdoor heat exchanger 32.

In this heating operation, the refrigerant inside the outdoor heat exchanger 32 is a low temperature low pressure, and if the temperature and pressure of the refrigerant passing through the outdoor heat exchanger 32 are raised, the temperature of the refrigerant passing through the indoor heat exchanger 41 and The pressure rises together, increasing the heating capacity. To this end, if the air flow rate around the outdoor heat exchanger 32 is increased by increasing the rotational speed of the outdoor blower fan 35, the heating capacity is slightly increased, but the refrigerant in the outdoor heat exchanger 32 and the indoor heat exchanger 41 are increased. Since the pressure difference between the refrigerants hardly changes, the power consumption of the compressor 31 does not decrease. In addition, if the rotation speed of the outdoor blower fan 35 is increased, the power consumption of the variable motor 36 for rotating the outdoor blower fan 35 is increased, and thus the cooling and heating performance coefficient COP of the air conditioner is not increased. Rather, it has been experimentally found that reducing the rotational speed of the outdoor blower fan 35 during the heating operation can increase the cooling and heating performance coefficient (COP) of the air conditioner.

FIG. 4 is a graph showing a change in the cooling and cooling performance coefficient (COP) of the air conditioner according to the operation state of the outdoor blower 34 during heating operation, and the cooling and heating performance coefficient (COP) when reducing the air volume of the outdoor blower 34. You can see that) increases. That is, when the airflow amount of the outdoor blower 34 is 28.3CMM (Cubic Meter per Minuite), the power consumption of the outdoor unit 30 is 67.6W and the cooling and cooling performance coefficient (COP) is 3.26W / W, whereas the outdoor blower ( When the air volume of 34 is reduced to 26.3CMM, the power consumption of the outdoor unit 30 is reduced to 58.1W and the cooling and heating performance coefficient (COP) is increased to 3.29W / W.

Accordingly, by heating the outdoor blower fan 35 at the time of heating operation at a speed of V ₂ lower than V ₁ in the cooling operation mode, the cooling and heating performance coefficient COP in the heating operation mode can be increased. .

On the other hand, Figure 5 is a schematic view showing a cooling and air conditioning combined air conditioning apparatus according to another embodiment of the present invention.

As shown in FIG. 5, the air conditioning and air conditioning apparatus according to another embodiment of the present invention differs from the air conditioning and air conditioning apparatus according to the preferred embodiment only in the configuration of the outdoor blower, and the rest of the configuration is the preferred embodiment. It is the same as the air-conditioning apparatus for both heating and cooling according to the example.

That is, the air conditioning and air conditioning apparatus according to another embodiment of the present invention includes an outdoor unit 50 including a compressor 51, an outdoor heat exchanger 52, an expansion mechanism 53, and an outdoor blower 54, and an indoor unit. It consists of an indoor unit 60 provided with a heat exchanger 61 and an indoor blower 62.

Here, the outdoor blower 54 is an outdoor blower fan 55, a motor 56 for rotating the outdoor blower fan 55, and an inverter 57 for varying the rotational speed of the motor 56. Is done.

Since the remaining components are the same as those of the air conditioning and air conditioning apparatus according to the preferred embodiment, description thereof will be omitted.

Cooling and heating combined air conditioner according to another embodiment of the present invention is a, V ₁ as seen when the cooling operation mode, refrigerant circulates in a solid line arrow direction shown in Fig. 5 and an outdoor blower fan 55 is shown in Figure 3 It rotates at rotation speed. On the other hand, in the heating operation mode, the refrigerant circulates in the direction of the dotted arrow shown in FIG. 5 and the outdoor blower fan 55 is in the cooling operation mode by the inverter 57 varying the rotational speed of the motor 56. the rotational speed is rotated at a rotational speed of the slower than V ₁ V _2.

Thus, by reducing the rotational speed of the outdoor blower fan 55 in the heating operation mode than in the cooling operation mode, it is possible to increase the cooling and heating performance coefficient (COP) in the heating operation mode.

According to the present invention described above, by varying the rotational speed of the outdoor blower fan in accordance with the cooling or heating operation mode, by reducing the power consumption of the blowing fan by reducing the rotational speed in the heating operation mode than in the cooling operation mode heating operation In this mode, the cooling and heating performance coefficient (COP) can be increased.

In the above, the present invention has been described using some specific embodiments as examples. However, the invention is not limited to the construction and operation as such is illustrated and described. That is, the present invention is capable of various changes and modifications within the scope of the appended claims. Accordingly, all such suitable changes, modifications, and equivalents should be considered to be within the scope of the present invention.

Claims (4)

A compressor for compressing the refrigerant; An outdoor heat exchanger used as a condenser for condensing the high temperature and high pressure refrigerant compressed by the compressor to a medium temperature and high pressure refrigerant in a cooling operation mode, and an evaporator for evaporating the refrigerant with low temperature and low pressure gas in the heating operation mode; An indoor heat exchanger used as an evaporator for evaporating refrigerant into a low temperature low pressure gas in a cooling operation mode and a condenser for condensing the high temperature and high pressure refrigerant compressed by the compressor into a medium temperature high pressure refrigerant in a heating operation mode; An expansion mechanism installed between the outdoor heat exchanger and the indoor heat exchanger to thermally expand the refrigerant; An outdoor blower fan forcibly blowing air around the outdoor heat exchanger to facilitate heat exchange of the outdoor heat exchanger; And And a fan driving device that variably rotates the blower fan but rotates at a slower rotation speed than in a cooling operation mode in a heating operation mode. The method of claim 1, The fan drive device is an air conditioning and heating device, characterized in that the rotational speed is variable. The method of claim 1, The fan driving device is a combined air conditioning and heating device characterized in that it comprises a motor and an inverter (inverter) for varying the rotational speed of the motor. The method of claim 1, And an indoor blower forcibly blowing indoor air around the indoor heat exchanger such that heat exchange of the refrigerant is actively performed in the indoor heat exchanger.

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