KR100816450B1 - Air conditioning method and system using brine heat exchanger - Google Patents

Abstract

The present invention relates to an air conditioner and a method for effectively performing seasonal cooling and heating by using a brine heat exchanger and a plurality of refrigerant heat exchangers.

The present invention implements a system for operating all or alternately a plurality of refrigerant heat exchangers in accordance with the temperature of the outside air due to seasonal changes, thereby improving the cooling and heating efficiency and reducing the power consumption, while in conjunction with the refrigerant heat exchanger to the temperature of the outside air By applying a brine heat exchanger to selectively heat exchange according to the air conditioner, it is possible to reduce the heating and cooling load when the air conditioner is running, and to use the brine heat exchanger to further reduce the power consumption by enabling the heating and cooling only by heat exchange between the outside and brine when the air conditioner is not running. Provided are an air conditioner and a method.

Air Conditioning System, Brine, Refrigerant, Heat Exchanger, Air Conditioning, Air Conditioner, Load, Power

Description

Air conditioning method and system using brine heat exchanger {Air conditioning method and system using brine heat exchanger}

1 is a circuit diagram showing an air conditioner according to the present invention

2 is a schematic view showing an embodiment of an air conditioner according to the present invention

3 is a circuit diagram showing a third mode (summer season) cooling operation state of the air conditioner according to the present invention.

Figure 4 is a circuit diagram showing a second mode (spring / autumn) cooling operation state of the air conditioner according to the present invention

5 is a circuit diagram showing a first mode (winter) cooling operation state of the air conditioner according to the present invention.

6 is a flow chart showing the control logic of the air conditioning method according to the present invention.

<Explanation of symbols for main parts of drawing>

10,20: refrigerant heat exchanger 11,21: refrigerant compressor

12,22: refrigerant condenser 13,23: refrigerant expansion valve

14,24: refrigerant evaporator 15,25: refrigerant condenser fan / motor

16,26: refrigerant liquid storage tank 17,27: refrigerant filter / dry

18,28: refrigerant liquid level meter

30: brine heat exchanger 31: indoor side brine heat exchanger

32: outdoor brine heat exchanger 33: brine storage tank

34: brine pump 35: outdoor brine fan / motor

40: Indoor fan / motor

The present invention relates to an air conditioner and a method using a brine heat exchanger, and more particularly, to connect a brine heat exchanger which selectively heats a plurality of refrigerant heat exchangers or alternating heat exchangers with the refrigerant heat exchanger depending on the temperature of the outside air. The present invention relates to an air conditioner and method using a brine heat exchanger that can reduce air-conditioning load when operating an air conditioner, and can reduce power consumption by enabling air-conditioning by only heat exchange between the outside and brine when the air conditioner is not running.

In general, an air conditioning system capable of selecting air conditioning may include a compressor, an outdoor heat exchanger, a refrigerant expansion means, an indoor heat exchanger, and the like. The refrigerant discharged to the compressor is supplied to the outdoor heat exchanger during the cooling operation of the air conditioning air conditioning system. And the flow path is switched so that the refrigerant passing through the indoor heat exchanger flows into the suction side of the compressor.

Therefore, the high temperature and high pressure refrigerant compressed by the compressor flows into the outdoor heat exchanger to condense into a liquid refrigerant state, and the condensed refrigerant expands to a low pressure refrigerant through the refrigerant expansion means, and the refrigerant passing through the refrigerant expansion means is an indoor heat exchanger. After evaporating to gaseous state, it flows back to the suction side of the compressor.

At this time, the refrigerant in the outdoor heat exchanger releases heat through heat exchange with the outside air, and the refrigerant in the indoor heat exchanger absorbs heat through heat exchange with the indoor air to perform cooling of the indoor space.

In general, there are large differences in cooling loads between summer and winter in areas with four distinct seasons, including Korea, and the cooling load required for spring and autumn is about 40% lower. In most existing air conditioning systems, seasonal cooling loads Even though there is a difference, even if a low load is applied, the movable medium such as the pump for supplying the refrigerant is operated at 100% capacity, causing the heat exchanger to be operated more than necessary, resulting in a decrease in cooling efficiency and unnecessary power and energy. There is a problem that waste occurs.

Therefore, the present invention has been made in view of the above, by implementing a system for operating all or alternately a plurality of refrigerant heat exchangers in accordance with the temperature of the outside air due to seasonal changes, it is possible to increase the cooling efficiency and reduce the power consumption An object of the present invention is to provide an air conditioner and a method using a brine heat exchanger.

In addition, another object of the present invention by applying a brine heat exchanger to selectively heat exchange in accordance with the temperature of the outside air in conjunction with the refrigerant heat exchanger, it is possible to reduce the cooling load when the air conditioner is running, only by heat exchange between the outside and brine when the air conditioner is not running The present invention provides an air conditioner and method using a brine heat exchanger that can further reduce power consumption by allowing cooling.

The objects of the present invention are not limited to the above-mentioned objects, and other objects which are not mentioned will be clearly understood by those skilled in the art from the following description.

The air conditioner of the present invention for achieving the above object is a plurality of refrigerant heat exchangers that are all or alternately operated in accordance with the temperature of the outside air, and the brine heat exchanger is operated in conjunction with the refrigerant heat exchanger or operated alone when the refrigerant heat exchanger is not running. Characterized in that it comprises a group.

In addition, the refrigerant heat exchanger is a refrigerant compressor, a refrigerant condenser, a refrigerant expansion valve and a refrigerant evaporator constitute a closed circulation circuit, and a refrigerant condenser fan / motor and an indoor fan / motor are assigned to the refrigerant condenser and the refrigerant evaporator, respectively. Characterized in that made.

The brine heat exchanger may further include an indoor brine heat exchanger and an outdoor brine heat exchanger constituting a closed circulation circuit, a brine storage tank and a brine pump respectively installed on a closed circulation circuit between the indoor and external brine heat exchangers, and the outdoor side. It characterized in that it comprises an outdoor side brine fan / motor and an indoor side fan / motor, respectively assigned to the brine heat exchanger and the indoor side brine heat exchanger.

On the other hand, the air conditioning method of the present invention for achieving the above object is to operate a plurality of refrigerant heat exchangers or all alternately in accordance with the temperature environment of the outside air, while operating a brine heat exchanger operating in conjunction with the plurality of refrigerant heat exchangers together with the refrigerant heat exchanger When the refrigerant or the heat exchanger does not operate, only the brine heat exchanger is operated alone to perform outside air cooling using brine.

The method of operating the refrigerant heat exchanger and the brine heat exchanger may include setting a room temperature, comparing the room temperature with a set temperature, and switching to a first cooling operation (winter) mode when the difference is within ± 1 ° C. Stop the refrigerant heat exchanger operation and compare the indoor inlet air temperature with the outside air temperature under the refrigerant heat exchanger operation or stop condition. If the indoor inlet air temperature is 10 ° C or higher than the outside temperature, operate the brine heat exchanger to perform outdoor air cooling. And less than 10 ℃ characterized in that it comprises a step of not operating the brine heat exchanger.

The method of operating the refrigerant heat exchanger and the brine heat exchanger may include setting a room temperature, comparing the room temperature with a set temperature, and performing a second cooling operation (spring / autumn) when the room temperature is 2 to 3 ° C. or higher than the set temperature. Operating only one of the plurality of refrigerant heat exchangers while switching to the mode, and comparing the indoor inlet air temperature to the outside temperature under one operating condition of the refrigerant heat exchanger. It is characterized in that it comprises the step of performing the outside air cooling to operate the brine heat exchanger if less than 10 ℃.

The method of operating the refrigerant heat exchanger and the brine heat exchanger may include setting a room temperature, comparing the room temperature with a set temperature, and then entering a third cooling operation (summer) mode when the room temperature is 4-5 ° C. or more above the set temperature. Operating all of the plurality of refrigerant heat exchangers while switching and comparing the indoor inlet air temperature to the outside temperature under operating conditions of the plurality of refrigerant heat exchangers, and operating the brine heat exchanger when the indoor inlet air temperature is 10 ° C or higher than the outside temperature to cool the outside air. If it is carried out and less than 10 ℃ characterized in that it comprises a step of not operating the brine heat exchanger.

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

1 is a circuit diagram showing an air conditioner according to the present invention.

As shown in FIG. 1, the air conditioner includes a plurality of refrigerant heat exchangers 10 and 20 and a brine heat exchanger 30 that operates in association with the refrigerant heat exchangers 10 and 20.

In the case of the refrigerant heat exchanger (10,20) is made in a manner that all or alternately depending on the room temperature.

For example, both of the two refrigerant heat exchangers 10 and 20 operate in the third cooling (summer) mode, or one of the two refrigerant heat exchangers 10 in the second cooling (spring / autumn) mode. (20) only, or in the case of the first cooling (winter) mode, the two refrigerant heat exchangers (10, 20) are not operated.

Of course, the selective operation of the refrigerant heat exchanger (10, 20) as described above is preferably determined based on the room temperature and the temperature of the outside air associated with it.

In addition, in the case of the brine heat exchanger 30 is made in a manner that is operated in connection with the outside temperature.

That is, according to the operation type of the refrigerant heat exchanger (10, 20) is performed at the appropriate time, for example, when the outside air cooling conditions are met together or alone to perform the outside air cooling using the brine, thereby improving the overall cooling efficiency In addition, the load of the refrigerant heat exchanger can be reduced.

In other words, by appropriately combining the operation of the refrigerant heat exchanger and the operation of the brine heat exchanger according to the indoor temperature conditions (outer air temperature conditions), the cooling efficiency can be expected to increase, and the load due to the excessive operation of the refrigerant heat exchanger can be reduced. Can be.

The refrigerant heat exchanger (10, 20) is a refrigerant circuit (11, 21), refrigerant condenser (12, 22), refrigerant expansion valve (13, 23), refrigerant evaporator (14, 24), etc. are sequentially disposed closed circuit Consists of a form that constitutes a cooling cycle.

In addition, the refrigerant condenser (12, 22) and the refrigerant evaporator (14, 24), respectively, the refrigerant condenser fan / motor (15, 25) and the indoor fan / motor (40) is assigned to the refrigerant fan / motor operation Condensing the refrigerant in the condenser or discharge the heat exchanged into the room.

In addition, the coolant liquid storage tanks 16 and 26, the coolant filters / dryers 17 and 27, and the coolant level gauges 18 and 28 are provided in the section between the coolant condenser 12 and 22 and the coolant expansion valves 13 and 23. It is installed to provide a coolant or to remove impurities in the coolant.

The cooling operation according to the operation of the refrigerant heat exchanger (10, 20) can apply the principle of the general cooling cycle.

The brine heat exchanger 30 includes an indoor brine heat exchanger 31 and an outdoor brine heat exchanger 32 constituting a closed circulation circuit, and the brine storage tank 33 and at least two The brine pump 34 is installed, and the outdoor brine heat exchanger 32 and the indoor brine heat exchanger 31 are assigned with the outdoor brine fan / motor 35 and the indoor fan / motor 40 respectively. The operation of the motor allows the heat exchange of the brine.

For example, as the brine pump 34 operates, the brine is circulated between the indoor and external brine heat exchangers 31 and 32, and the brine is changed to a relatively low temperature via the outdoor brine heat exchanger 32. Subsequently, while performing the heat exchange action with the indoor air while passing through the indoor side brine heat exchanger 31, it is possible to play a role of lowering the temperature of the indoor air.

2 is a schematic view showing an embodiment of an air conditioner according to the present invention.

As shown in FIG. 2, basically, the refrigerant heat exchangers 10 and 20 are disposed at the indoor side, and the brine heat exchanger 30 is disposed at the outdoor side, and these are connected to each other through a pipe to allow for contact of the refrigerant. Done.

In addition, the indoor side brine heat exchanger 31 of the brine heat exchanger 30 is mounted in the main body of the refrigerant heat exchanger (10, 20) to be able to perform the heat exchange action between the indoor air and brine, as in normal air conditioners Outdoor, for example, refrigerant compressors 11 and 21 of the refrigerant heat exchangers 10 and 20 are mounted in the main body of the brine heat exchanger 30.

Therefore, the indoor fan / motor is operated together with the operation of the refrigerant heat exchanger in the room, and the indoor cooling using the refrigerant can be achieved. The outdoor brine fan / motor is operated together with the operation of the brine heat exchanger in the outdoors. The heat exchange can be made and at the same time the heat exchanged brine is provided to the indoor side brine heat exchanger side by the operation of the indoor fan / motor can also be performed indoor cooling using the brine.

The refrigerant heat exchangers 10 and 20 and the brine heat exchanger 30 are operated in conjunction with each other based on the temperature of the outside air according to the change of the season or the like (substantially based on the indoor temperature).

To this end, in the present invention, by installing a temperature sensor at each of the three points (P1, P2, P3) to sense the temperature value at each point, it can be used for the linkage operation of the refrigerant heat exchanger and the brine heat exchanger. .

Here, P1 is a point for sensing the indoor set temperature, P2 is a point for sensing the indoor inlet temperature, P3 is a point for sensing the outside temperature, the room temperature can be set by the temperature sensing value in P1, As the comparative temperature sensing value of P3, it is possible to determine the outdoor air condition using the brine and the environment such as the season.

Meanwhile, technical methods related to operating the refrigerant heat exchanger based on the temperature value of each sensor for each cooling mode according to the season, or operating the brine heat exchanger in connection therewith, are particularly known in the art. It can be adopted without limitation.

3 to 5 is a circuit diagram showing a cooling operation state for each mode of the air conditioner according to the present invention.

As shown in FIG. 3, in the third cooling mode (summer), the two refrigerant heat exchangers 10 and 20 operate.

At this time, the operation of the two refrigerant heat exchangers (10, 20) is performed in a cooling cycle such as the flow of the refrigerant, such as a conventional air conditioning system, the refrigerant paths of the refrigerant compressors (11, 21), refrigerant condenser (12, 22), refrigerant expansion valves (13, 23), refrigerant evaporators (14, 24) in this order.

In the case of the third cooling mode, since the outdoor temperature is high, that is, the heat exchange between the high temperature brine and the outside air is meaningless, the brine heat exchanger 30 is not operated, and the indoor and external brine is stopped by the operation of the brine pump 34. The brine does not move between the heat exchangers 31 and 32.

Here, the solid line means a line which is operated and a line which does not operate a dotted line.

As shown in FIG. 4, in the second cooling mode (spring / autumn), only one of the two refrigerant heat exchangers 10 and 20 alternately operates.

In addition, in the case of the brine heat exchanger 30, the brine pump 34 is turned on / off according to the condition of the outside air cooling conditions, and thus the brine heat exchanger 30 is operated to selectively perform indoor cooling using brine. It becomes possible.

When the air cooling using the brine is performed in this way, since the temperature of the air passing through the indoor side brine heat exchanger 31 disposed in front of the refrigerant evaporator 14 in the refrigerant heat exchanger 10 can be lowered primarily. That is, since the temperature of the indoor air circulated while being introduced into the heat exchanger main body by the operation of the refrigerant heat exchanger 10 and then discharged to the indoor side again can be lowered to the indoor side brine heat exchanger 31, The load can be reduced and the cooling efficiency can be increased.

As shown in FIG. 5, the two refrigerant heat exchangers 10 and 20 do not operate in the first cooling mode (winter).

At this time, the refrigerant heat exchanger (10, 20) means that the operation of the refrigerator, the cooling cycle is stopped, the indoor fan / motor 40 is in a state of operation.

On the other hand, while the brine heat exchanger 30 is operated in accordance with the outdoor air cooling conditions whether to perform the indoor cooling by using the brine after heat exchange with the outdoor cold air.

That is, while the brine pump 34 is operated, the brine is circulated between the indoor brine heat exchanger 41 and the outdoor brine heat exchanger 42, and the operation of the outdoor brine fan / motor 35 is continued. In addition, the low temperature brine that has completed the heat exchange with the cold outside while passing through the outdoor side brine heat exchanger 41 may move to the indoor side brine heat exchanger 42 to perform indoor cooling.

According to this method, unnecessary power consumption can be reduced by operating only one of the two refrigerant heat exchangers in the spring / autumn season, for example, which is relatively colder than the summer season, and relatively heat exchanged with the outside air through the outdoor brine heat exchanger. Since indoor cooling can be performed by using the brine which is at a low temperature, there is an advantage that the cooling load applied to the two refrigerant heat exchangers can be reduced.

6 is a flowchart showing a control logic of the air conditioning method according to the present invention.

As shown in Fig. 6, here, according to each cooling mode such as mode 1 (winter season), mode 2 (spring / autumn season) and mode 3 (summer season) according to the outside temperature (actually have the room temperature value). When the plurality of refrigerant heat exchangers are all or alternately operated, or when the external air cooling condition is reached, the air conditioner is operated by operating together with the refrigerant heat exchanger by using a brine heat exchanger that is linked with the refrigerant heat exchanger or by operating the refrigerant heat exchanger alone. Show how to drive in parallel.

First, a step of setting the temperature of the room to, for example, 25 ° C is performed.

Next, the step of comparing the temperature set in this way and the actual room temperature is performed.

In this step, three cooling modes, that is, a first (winter) cooling mode, a second (spring / autumn) cooling mode, and a third (summer season) cooling mode may be determined according to a comparison result between the set temperature and the room temperature.

First, if the difference between the room temperature and the set temperature is within ± 1 ° C, for example, if the set temperature is 25 ° C and 24 ° C <room temperature ≤ 26 ° C, the first (winter season) cooling operation mode is switched to Then, the steps of halting all of the plurality of refrigerant heat exchangers are performed (the indoor fan / motor is in operation).

At this time, when the outside air cooling conditions, that is, when the indoor inlet air temperature is higher than the outside temperature by comparing the indoor inlet air temperature and the outside temperature, the brine heat exchange with the alternating operation of the brine pump and the operation of the outdoor side brine fan / motor The air is cooled to operate the air, and if the temperature is less than 10 ° C, the brine heat exchanger is not operated.

Second, when the room temperature is 2 to 3 ° C. or higher than the set temperature by comparing the room temperature with the set temperature, for example, when the condition is 26 ° C. <room temperature ≤ 28 ° C., the second (spring / autumn season) cooling operation mode is switched to. Subsequently, only one refrigerant heat exchanger of the plurality of refrigerant heat exchangers is operated.

That is, the cooling cycle for one refrigerant heat exchanger is performed together with the operation of the indoor fan / motor.

At this time, when the outside air cooling conditions, that is, the indoor inlet air temperature and the outside air temperature is compared by 10 ℃ or more higher than the outside temperature, the brine heat exchanger is operated to perform the outside air cooling, if less than 10 ℃ the brine heat exchanger Perform steps that do not start up.

Third, if the room temperature is 4-5 ° C. or higher than the set temperature by comparing the room temperature with the set temperature, for example, if the condition is 28 ° C. <room temperature ≤ 30 ° C., the system is switched to the third (summer season) cooling operation mode and continues. To perform all of the plurality of refrigerant heat exchangers.

In other words, the cooling cycle for the two refrigerant heat exchangers is performed together with the operation of the indoor fan / motor.

At this time, when the outside air cooling conditions, that is, the indoor inlet air temperature and the outside air temperature is compared by 10 ℃ or more higher than the outside temperature, the brine heat exchanger is operated to perform the outside air cooling, if less than 10 ℃ the brine heat exchanger Perform steps that do not start up.

In this way, the indoor temperature is set and the refrigerant heat exchanger is appropriately operated according to the generated load to perform cooling for each cooling mode, and the indoor inlet air temperature (air flowing into the refrigerant heat exchanger main body when the indoor fan / motor is operated). Temperature) and external temperature to determine whether the outdoor air conditioner is properly operated in parallel, and the overall air-conditioning of the room can be performed under the optimum conditions corresponding to the outdoor temperature environment according to the change of seasons. In addition, the appropriate selection of the brine heat exchange action can reduce the air conditioner load, thereby reducing the power consumption significantly.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive.

As described above, the present invention provides air including a method of operating a plurality of refrigerant heat exchangers all or alternately according to the temperature of the outside air, a method of independently operating a brine heat exchanger when the air conditioner is not running in conjunction with a refrigerant heat exchanger and a brine heat exchanger, and the like. By providing a conditioning system, it is possible to increase the cooling efficiency, to reduce the air conditioning load, and to significantly reduce the power consumption.

Claims (7)

 The plurality of refrigerant heat exchangers 10 and 20 and all of which are alternately operated according to the temperature of the outside air and are operated together with the refrigerant heat exchangers 10 and 20 or when the refrigerant heat exchangers 10 and 20 are not operated. Air conditioning apparatus using a brine heat exchanger, characterized in that comprises a movable heat exchanger (30). The method of claim 1, wherein the refrigerant heat exchanger (10, 20) is a refrigerant compressor (11, 21), refrigerant condenser (12, 22), refrigerant expansion valve (13, 23) and refrigerant evaporator (14, 24) closed circuit At the same time, the refrigerant condenser (12, 22) and the refrigerant evaporator (14, 24), the refrigerant condensation fan / motor (15, 25) and the indoor fan / motor (40) is characterized in that the form is assigned An air conditioner using a brine heat exchanger. The brine heat exchanger (30) according to claim 1, wherein the brine heat exchanger (30) is formed between an indoor side brine heat exchanger (31) and an outdoor side brine heat exchanger (32) which form a closed circulation circuit. The brine storage tank 33 and the brine pump 34 respectively installed on the closed circulation circuit of the outdoor brine fan / motor respectively assigned to the brine heat exchanger 32 and the brine heat exchanger 31 of the indoor side. Air conditioning apparatus using a brine heat exchanger, characterized in that it comprises a (35) and the indoor fan / motor (40). Depending on the generated load (temperature condition) of the room, all or alternatively the plurality of refrigerant heat exchangers are operated, while the brine heat exchanger is operated together with the refrigerant heat exchanger depending on the ambient temperature conditions, or only the brine heat exchanger is operated alone when the refrigerant heat exchanger is not operated. Air conditioning method using a brine heat exchanger, characterized in that to perform the outside air cooling using brine. delete delete delete

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