KR20100062117A - Air conditioner having plate heat exchanger and controlling method of the same of - Google Patents

Air conditioner having plate heat exchanger and controlling method of the same of Download PDF

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Publication number
KR20100062117A
KR20100062117A KR1020080120556A KR20080120556A KR20100062117A KR 20100062117 A KR20100062117 A KR 20100062117A KR 1020080120556 A KR1020080120556 A KR 1020080120556A KR 20080120556 A KR20080120556 A KR 20080120556A KR 20100062117 A KR20100062117 A KR 20100062117A
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KR
South Korea
Prior art keywords
temperature
heat exchanger
refrigerant
plate heat
reference temperature
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KR1020080120556A
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Korean (ko)
Inventor
김경록
배동석
이제진
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삼성전자주식회사
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Priority to KR1020080120556A priority Critical patent/KR20100062117A/en
Publication of KR20100062117A publication Critical patent/KR20100062117A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser

Abstract

The present invention relates to an air conditioner having a plate heat exchanger and a control method thereof, and to an air conditioner having a plate heat exchanger for preventing freezing of the plate heat exchanger and a control method thereof. To this end, an air conditioner using a plate heat exchanger according to an embodiment of the present invention includes a compressor for compressing a refrigerant; A plate heat exchanger configured to exchange heat between the refrigerant and the heat source water; It includes a temperature sensor for sensing the temperature of the refrigerant flowing into the plate heat exchanger and a control unit for controlling the operation of the compressor compared to the temperature and the reference temperature of the refrigerant detected by the temperature sensor.

Description

Air conditioner having plate heat exchanger and controlling method thereof {Air conditioner having plate heat exchanger and controlling method of the same of}

The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner having a plate heat exchanger for preventing freezing of the plate heat exchanger and a control method thereof.

In general, an air conditioner is a device used for cooling or heating indoors. The refrigerant is circulated between the indoor unit and the outdoor unit to absorb ambient heat when the refrigerant evaporates and to release the heat when liquefied. Perform cooling or heating.

Such an air conditioner includes a plurality of heat exchange fins arranged to be spaced apart from each other, and a refrigerant pipe that guides the refrigerant and is installed to penetrate the plurality of heat exchange fins. It includes a fin heat exchanger for cooling or heating the air by heat exchange with the refrigerant passing through the tube.

In recent years, a plate heat exchanger that allows a refrigerant flow formed by a heat transfer plate having a large heat transfer area and a heat source oil flow to exchange heat with the refrigerant and heat source water is used as an evaporator or a condenser of an air conditioner because the heat exchange efficiency is higher than that of other heat exchangers. An air conditioner having a plate heat exchanger has been proposed.

On the other hand, when the plate heat exchanger of the air conditioner having a plate heat exchanger acts as an evaporator, when the heat source number is excessively cooled or the flow rate of the heat source water is reduced, the heat source water is frozen inside the plate heat exchanger and thus the plate heat exchanger is freeze. .

It is an object of the present invention to provide an air conditioner having a plate heat exchanger capable of preventing freezing of the plate heat exchanger when the plate heat exchanger serves as an evaporator and a control method thereof.

In another aspect, the present invention provides an air conditioner having a plate heat exchanger for improving the reliability of preventing freezing of the plate heat exchanger and a control method thereof.

       To this end, an air conditioner using a plate heat exchanger according to an embodiment of the present invention includes a compressor for compressing a refrigerant; a plate heat exchanger for allowing the refrigerant and heat source water to heat exchange; It includes a temperature sensor for sensing the temperature of the refrigerant flowing into the plate heat exchanger and a control unit for controlling the operation of the compressor compared to the reference temperature and the reference temperature of the refrigerant detected by the temperature sensor.

      Here, the reference temperature includes a first reference temperature and a second reference temperature, the control unit decreases the operation rate of the compressor when the temperature of the detected refrigerant is less than the first reference temperature, the detected refrigerant If the temperature is less than the second reference temperature, the operation of the compressor is stopped. Here, when the refrigerant and the heat source number flows to face each other, the first reference temperature is a value obtained by adding an error constant to the freezing temperature of the heat source water, and the second reference temperature is a stop control necessary constant to the first reference temperature. Plus the value. When the coolant and the heat source number flow in parallel with each other, the first reference temperature is a value obtained by adding a pressure drop temperature and an error constant of the coolant to the freezing temperature of the heat source water, and wherein the second reference temperature is the first reference temperature. Plus stop constant required constant.

      The apparatus may further include a low pressure side temperature sensor configured to sense a low pressure side temperature of the compressor.

The controller determines a failure of the temperature sensor by using the temperature detected by the low pressure side temperature sensor.

      The apparatus may further include a low pressure side pressure sensor for detecting a low pressure side pressure of the compressor, and the controller determines a failure of the temperature sensor using the pressure sensed by the low pressure side pressure sensor.

     In another aspect, a control method of an air conditioner using a plate heat exchanger according to an embodiment of the present invention includes receiving a refrigerant inlet side temperature of a plate heat exchanger and comparing the received refrigerant inlet side temperature with a control reference temperature. Accordingly controlling the operation of the compressor.

       Here, the reference temperature includes a first reference temperature and a second reference temperature, and the step of controlling the operation of the compressor, if the input refrigerant inlet side temperature is less than the first reference temperature is the operating rate of the compressor When the input refrigerant inlet side temperature is lower than the second reference temperature, the compressor is stopped. Here, when the refrigerant and the heat source number flow in the plate heat exchanger facing each other, the first reference temperature is a value obtained by adding an error constant to the freezing temperature of the heat source water, and the second reference temperature is the first reference temperature This is the value obtained by adding necessary stop control constants. In the plate heat exchanger, when the refrigerant and the heat source number flow in parallel with each other, the first reference temperature is a value obtained by adding a pressure drop temperature and an error constant of the refrigerant to a freezing temperature of the heat source water. The first reference temperature is a value obtained by adding a stop control necessary constant.

      The method may include detecting a low pressure side temperature of the compressor and determining a failure of a temperature sensor for detecting a refrigerant inlet side temperature of the plate heat exchanger using the sensed low pressure side temperature.

      The method may further include detecting a low pressure side pressure of the compressor and determining a failure of a temperature sensor for detecting a refrigerant inlet side temperature of the plate heat exchanger using the sensed low pressure side pressure.

As described above, when the plate heat exchanger serves as an evaporator, an air conditioner having a plate heat exchanger according to an embodiment of the present invention and a control method thereof prevents freezing of the plate heat exchanger.

Further, as described above in another aspect, the reliability of preventing freezing of the plate heat exchanger is improved by the air conditioner having the plate heat exchanger and the control method thereof according to the embodiment of the present invention.

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

1 and 2, an air conditioner using a plate heat exchanger according to an embodiment of the present invention is a compressor 10 for compressing a refrigerant, a fin heat exchanger 20 is installed indoors, and is installed outdoors A plate heat exchanger (30), an electromagnetic expansion valve (50) for expanding the refrigerant introduced into the plate heat exchanger (30), an accumulator (70) for allowing the refrigerant introduced into the compressor (10) to be a gaseous refrigerant, First to fifth refrigerant tubes 91 to 91 form a closed refrigerant circuit via the compressor 10, the fin heat exchanger 20, the plate heat exchanger 30, the electromagnetic expansion valve 50, and the accumulator 70. 95, a four-way valve 40 for setting a refrigerant circuit for the heating operation mode or a refrigerant circuit for the heating operation mode having first to fourth ports 41 to 44, and the low pressure of the compressor 10. On the basis of the low pressure side temperature sensor 62 and the low pressure side pressure sensor 63 provided on the side, and the heating operation mode. At the refrigerant inlet side temperature sensor 61, the low pressure side temperature sensor 62, the low pressure side pressure sensor 63 and the refrigerant inlet side temperature sensor 61 provided at the refrigerant inlet 33 of the plate heat exchanger 30. The controller 100 controls the compressor 10 by using the sensed value.

The outlet 12 of the compressor 10 is connected to the first port 41 of the four-way valve 40 by a fifth refrigerant pipe 95. The inlet 11 of the compressor 10 is connected to the third port 43 of the four-way valve 40 by a fourth refrigerant pipe 94. The compressor 10 has a variable operation rate by the controller 100, and compresses the low pressure refrigerant sucked through the inlet 11 of the compressor 10 to pass the compressed refrigerant through the fifth refrigerant pipe 95. The first port 41 of the four-way valve 40 is provided.

Meanwhile, an accumulator 70 is installed on the fourth refrigerant pipe 94 to prevent the liquid refrigerant from flowing into the compressor 10, and detects the pressure of the suction side (or the low pressure side) of the compressor 10. The low pressure side pressure sensor 63 is provided, and the low pressure side temperature sensor 62 for detecting the suction side (or low pressure side) temperature of the compressor 10 is provided. Here, the low pressure side pressure sensor 63 and the low pressure side temperature sensor 62 detect the compressor low pressure side pressure and the compressor low pressure side temperature, respectively, and provide them to the control unit 100.

Finned heat exchanger 20 is composed of a fin and a tube. The fin heat exchanger inlet 21 and the fin heat exchanger outlet 22 are formed at both ends of the tube of the fin heat exchanger 20 when the fin heat exchanger 20 serves as a condenser. In addition, the fin type heat exchanger inlet 21 and the second port 42 of the four-way valve 40 are connected by the first refrigerant pipe 91. The fin heat exchanger outlet 22 is connected to the refrigerant inlet 33 of the plate heat exchanger 30 by the second refrigerant pipe 92.

In the plate heat exchanger 30, a plurality of heat transfer plates are stacked to form a refrigerant passage and a heat source water passage alternately between the plurality of heat transfer plates. At both ends of the refrigerant flow path of the plate heat exchanger, when the plate heat exchanger 30 serves as an evaporator, a refrigerant inlet 33 through which the refrigerant flows and a refrigerant outlet 34 through which the refrigerant flows are formed. The heat source water inlet 31 and the heat source water outlet 32 are formed at both ends of the heat exchange channel 30 of the plate heat exchanger 30, and the heat source water inlet 31 and the heat source water outlet 32 are plate heat exchangers 30. Is connected to an installation requiring a cooled or heated number of heat sources. The plate heat exchanger 30 may be designed such that the flow direction of the coolant flowing in the coolant flow path and the flow direction of the heat source water flowing in the heat source water flow path are the same or opposite to each other. More specific configuration and function of the plate heat exchanger 30 will be apparent with reference to Korean Patent Publication No. 10-2008-0006122.

The outlet 22 of the fin heat exchanger 20 and the refrigerant inlet 33 of the plate heat exchanger 30 are connected by a second refrigerant pipe 92. In addition, an electronic expansion valve 50 is installed on the second refrigerant pipe 92 to expand the refrigerant flowing into the refrigerant inlet 33 of the plate heat exchanger 30. In addition, a check valve 51 is installed in parallel with the electromagnetic expansion valve 50 so that the refrigerant flowing out of the refrigerant inlet 33 of the plate heat exchanger 30 when the plate heat exchanger 30 serves as a condenser is supplied. Provide pass flow path.

The four-way valve 40 sets the heating operation mode refrigerant passage or the cooling operation mode refrigerant passage. In other words, when the air conditioner using the plate heat exchanger according to the embodiment of the present invention is in the heating operation mode, the first and second ports 41 and 42 are connected, and the third and fourth ports 43 and 44 are connected. To set the refrigerant circuit to circulate the compressor (10)-> fin type heat exchanger (20)-> electromagnetic expansion valve (50)-> plate heat exchanger (30)-> accumulator (70) In the mode, the first and fourth ports 41 and 44 are connected to each other, and the second and third ports 42 and 43 are connected to each other so that the refrigerant is compressed in the compressor 10-> plate heat exchanger 30-> fin type. A refrigerant circuit for circulating the heat exchanger 20-> accumulator 70-> compressor 10 is set.

On the input side of the control unit 100, the pressure at the low pressure side (or suction side) of the refrigerant inlet side temperature sensor 61 and the compressor 10 for sensing the refrigerant inlet side refrigerant temperature of the input unit 110 and the plate heat exchanger 30 The low pressure side pressure sensor 63 for detecting the low pressure side temperature sensor 62 for detecting the temperature of the low pressure side (or the suction side) of the compressor 10 is provided, and the output side to set the refrigerant circuit according to the heating and cooling mode The four-way valve 40, the electronic expansion valve 50 for expanding the refrigerant and the compressor 10 for compressing the refrigerant 10 and the display unit 120 for displaying the operating state of the air conditioner having a plate heat exchanger is provided.

When the control unit 100 performs the heating operation mode, the controller 100 reduces the operation rate of the compressor 10 or compares the temperature of the refrigerant inlet side temperature sensor 61 with the reference temperature. Stop operation Here, the reference temperature includes a reduction control reference temperature (T_con: first reference temperature) and a stop control reference temperature (T_off: second reference temperature).

Specifically, the controller 100 reduces the operation rate of the compressor 10 when the refrigerant inlet side temperature is smaller than the reduction control reference temperature T_con (first reference temperature). The controller 100 stops the operation of the compressor 10 when the coolant inlet side temperature is smaller than the stop control reference temperature T_off (the second reference temperature).

A design method of the reduction control reference temperature (T_con: first reference temperature) and the stop control reference temperature (T-off) will be described with reference to the accompanying drawings.

As shown in FIGS. 4 and 5, the flow direction RF of the refrigerant flowing through the refrigerant flow path RD in the plate heat exchanger 30 and the flow direction WF of the heat source water flowing through the heat source water flow passage WD are In the case of facing each other, the temperature distribution of the refrigerant R becomes lower as the temperature goes from the refrigerant inlet side 33 to the outlet side 34, and the temperature distribution of the heat source water W is the outlet side from the refrigerant inlet side 33. The temperature rises toward (34). Therefore, when the flow direction RF of the refrigerant flowing through the refrigerant passage RD and the flow direction WF of the heat source water flowing through the heat source water passage WD face each other, the refrigerant inlet side 33 having the lowest temperature of the heat source water 33 When the temperature of the refrigerant is equal to or higher than the freezing temperature of the heat source water, freezing of the plate heat exchanger 30 due to freezing of the heat source water is prevented.

Specifically, when the flow direction (RF) of the refrigerant flowing through the refrigerant flow path (RD) in the plate heat exchanger (30) and the flow direction (WF) of the heat source water flowing through the heat source water passage (WD) face each other, the reduction control criteria The temperature T_con (first reference temperature) and the stop control reference temperature (T_off: second reference temperature) are designed by using Equations 1 and 2 below.

[Equation 1]

T_fr + A = T_con

&Quot; (2) "

T_fr + A + b = T_off

In Equations 1 and 2, T_fr is a freezing temperature of the heat source water, A is an error constant, b is a compressor stop control necessary constant, and A and A + b have a relationship A> A + b.

As shown in FIGS. 6 and 7, the flow direction of the refrigerant flowing through the refrigerant flow path RD inside the plate heat exchanger 30 and the heat source water W flowing through the heat source water flow path WD. When the directions WF are identical to each other, the temperature distribution of the heat source water W is increased from the refrigerant inlet side 33 to the outlet side 34, and the temperature distribution of the refrigerant R is at the refrigerant inlet side 33. At the outlet 34, the temperature decreases due to the pressure drop, and when the refrigerant R is completely evaporated, the temperature rises by heat exchange with the heat source water W. Therefore, if the minimum temperature of the refrigerant R flowing through the refrigerant flow path RD is equal to or higher than the freezing temperature of the heat source water W, freezing of the plate heat exchanger 30 due to freezing of the heat source water is prevented.

Specifically, when the flow direction (RF) of the refrigerant flowing through the refrigerant flow path (RD) in the plate heat exchanger (30) and the flow direction (WF) of the heat source water flowing through the heat source water flow passage (WD) are the same direction, reduction control. The reference temperature (T_con: first reference temperature) and the stop control reference temperature (T_off: second reference temperature) are designed by using Equations 3 and 4 below.

&Quot; (3) "

T_fr + T_p-drop + A = T_con

&Quot; (4) "

T_fr + T_p-drop + A + b = T_off

In Equations 3 and 4, T_fr is the freezing temperature of the heat source water, T_p-drop is the pressure drop temperature of the refrigerant, A is the error constant, b is the compressor stop control constant, and the relationship between A and A + b. Has a relationship A> A + b.

In addition, the controller 100 may determine whether the temperature sensor 61 of the refrigerant inlet-side temperature sensor 61 has failed based on a constant relationship between the inlet temperature of the plate heat exchanger 30 and the low pressure-side pressure and temperature of the compressor 10. To judge. That is, the controller 100 calculates the saturation temperature with respect to the evaporation pressure by using the low pressure side pressure sensed by the low pressure side pressure sensor 63, and adds an error constant to the calculated saturation temperature to the refrigerant inlet side temperature sensor 61. The sensor fault reference temperature is calculated to determine whether the fault is detected. If the refrigerant inlet side temperature is higher than the sensor fault reference temperature, it is determined that the sensor has failed. In this case, the refrigerant inlet side temperature sensor failure is displayed on the display unit 120 so that the failure of the refrigerant inlet side temperature sensor can be recognized by the user. Here, the controller 100 may calculate a sensor failure reference temperature by adding an error constant to the low pressure side temperature detected by the low pressure side temperature sensor 62.

Hereinafter, a control method of an air conditioner using a plate heat exchanger according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 3, when operation conditions are input through the input unit 110 and operation starts, the controller 100 determines whether the heating operation mode is performed (301). At this time, if the heating operation mode is not the control unit 100 performs the cooling operation mode (302), and determines whether the operation termination condition (303), and if the operation termination condition is not returned to step 301 and the subsequent steps If the operation is terminated, the operation is stopped (304) and ends.

On the other hand, in the heating operation mode, the control unit 100 performs the heating operation mode (305). In other words, the controller 100 controls the four-way valve 40 so that the four-way valve 40 sets a refrigerant circuit for the heating operation mode. Accordingly, the fin heat exchanger 20 serves as a condenser, and the plate heat exchanger 30 serves as an evaporator.

Then, the control unit 100 receives the refrigerant inlet side temperature of the plate heat exchanger 30 from the refrigerant inlet side temperature sensor 61 (306).

Subsequently, the controller 100 determines whether the refrigerant inlet side temperature is smaller than the reduction control reference temperature T_con for a predetermined time (307). Here, the reduction control reference temperature (T_con; first reference temperature) is set differently depending on whether the flow direction of the refrigerant flowing in the plate heat exchanger 30 and the flow direction of the heat source water is the same.

At this time, if the refrigerant inlet side temperature is less than the reduction control reference temperature (T_con: first reference temperature) for a predetermined time, the control unit 100 reduces the operation rate of the compressor 10 (308). Accordingly, the amount of refrigerant flowing into the refrigerant inlet 33 of the plate heat exchanger 30 decreases so that the temperature of the refrigerant inlet side of the plate heat exchanger 30 and the minimum temperature of the refrigerant flowing through the plate heat exchanger 30 rise. do. On the other hand, if the refrigerant inlet side temperature is not lower than the reduction control reference temperature (T_con: first reference temperature) for a predetermined time, the control unit 100 performs the next step.

Next, the controller 100 determines whether the refrigerant inlet side temperature is smaller than the stop control reference temperature (T_off: second reference temperature) for a predetermined time (309). Here, the stop control reference temperature (T_off: second reference temperature) is set differently depending on whether the flow direction of the refrigerant flowing in the plate heat exchanger 30 and the flow direction of the heat source water is the same.

At this time, if the refrigerant inlet side temperature is less than the stop control reference temperature (T_off: second reference temperature) for a predetermined time, the controller 100 stops the operation of the compressor 10 (310). Accordingly, the inflow of the refrigerant into the refrigerant inlet 33 of the plate heat exchanger 30 is stopped so that the temperature of the refrigerant inlet side and the minimum temperature of the refrigerant flowing through the plate heat exchanger 30 rise faster than in step 308. .

On the other hand, if the refrigerant inlet side temperature is not lower than the stop control reference temperature (T_off: second reference temperature) for a predetermined time, the controller 100 performs the next step.

 Then, the control unit 100 receives the compressor low pressure side pressure from the low pressure side pressure sensor 63, calculates the saturation temperature for the evaporation pressure, and calculates the sensor failure reference temperature by adding the error constant to the calculated saturation temperature. (311).

Subsequently, the controller 100 receives the compressor low pressure side temperature from the low pressure side temperature sensor 62, and calculates a sensor failure reference temperature by adding an error constant to the compressor low pressure side temperature (312).

Next, the controller 100 determines whether the refrigerant inlet side temperature detected by the refrigerant inlet side temperature sensor 61 is greater than the sensor failure reference temperature calculated in step 311 or 312 (313).

At this time, if the refrigerant inlet side temperature is not greater than the sensor failure reference temperature, the control unit 100 determines whether the heating operation mode end condition (314), and if the heating operation mode end condition is not, the control unit 100 returns to step 306 and After that, if the heating operation mode is terminated, the control unit 100 performs step 303 and subsequent steps.

On the other hand, if the refrigerant inlet side temperature is greater than the sensor failure reference temperature, the control unit 100 controls the display unit 120 to display the temperature sensor failure (315), the operation stop 305 ends. Accordingly, the reliability of the refrigerant inlet side temperature sensor 61 is secured, thereby improving the reliability of freezing prevention of the plate heat exchanger 30.

Figure 1 is a schematic diagram showing an air conditioner with a plate heat exchanger according to an embodiment of the present invention.

Figure 2 is a block diagram of a control system of an air conditioner having a plate heat exchanger according to an embodiment of the present invention.

3 is a flowchart illustrating a control method of an air conditioner having a plate heat exchanger according to an embodiment of the present invention.

4 is a view showing a state in which the flow direction of the refrigerant and the heat source water are different in the plate heat exchanger according to an embodiment of the present invention.

5 is a graph showing the temperature distribution of the refrigerant and the heat source water in the plate heat exchanger when the flow direction of the refrigerant and the heat source water are different in the plate heat exchanger according to an embodiment of the present invention.

6 is a view showing a state in which the flow direction of the refrigerant and the heat source water are the same in the plate heat exchanger according to an embodiment of the present invention.

7 is a graph showing the temperature distribution of the refrigerant and the heat source water in the plate heat exchanger when the flow direction of the refrigerant and the heat source water in the plate heat exchanger according to an embodiment of the present invention are the same.

Description of the Related Art [0002]

10: compressor 30: plate heat exchanger

61: refrigerant inlet side temperature sensor 62: low pressure side temperature sensor

63: low pressure side pressure sensor 100: control unit

120: display unit

Claims (12)

       A compressor for compressing the refrigerant; A plate heat exchanger configured to exchange heat between the refrigerant and the heat source water; A temperature sensor for sensing a temperature of the refrigerant flowing into the plate heat exchanger; An air conditioner having a plate heat exchanger including a control unit for controlling the operation of the compressor compared to the reference temperature and the temperature of the refrigerant sensed by the temperature sensor.        The method of claim 1,       The reference temperature includes a first reference temperature and a second reference temperature,      The control unit reduces the operation rate of the compressor when the detected temperature of the refrigerant is less than the first reference temperature, and stops the operation of the compressor when the temperature of the detected refrigerant is less than the second reference temperature Air conditioner with heat exchanger.       The method of claim 2,       When the refrigerant and the heat source number flow to face each other, the first reference temperature is a value obtained by adding an error constant to the freezing temperature of the heat source water, and the second reference temperature is a value obtained by adding a stop control necessary constant to the first reference temperature. Air conditioner with plate heat exchanger.       The method of claim 2,      When the coolant and the heat source number flow in parallel with each other, the first reference temperature is a value obtained by adding a pressure drop temperature and an error constant of the coolant to the freezing temperature of the heat source water, and the second reference temperature stops at the first reference temperature. Air conditioner with plate heat exchanger plus control constant.       The method of claim 1,       Further comprising a low pressure side temperature sensor for sensing the low pressure side temperature of the compressor,      The controller is an air conditioner having a plate heat exchanger for determining the failure of the temperature sensor using the temperature detected by the low-pressure side temperature sensor.       The method of claim 1,       Further comprising a low pressure side pressure sensor for detecting the low pressure side pressure of the compressor,       The control unit is an air conditioner having a plate heat exchanger for determining the failure of the temperature sensor using the pressure detected by the low-pressure side pressure sensor.        Receiving a temperature at a refrigerant inlet side of the plate heat exchanger;       And controlling the operation of the compressor according to the comparison result of the input refrigerant inlet side temperature and the control reference temperature.       The method of claim 7, wherein        The reference temperature includes a first reference temperature and a second reference temperature,       The controlling of the operation of the compressor may include reducing an operation rate of the compressor when the input refrigerant inlet side temperature is less than the first reference temperature, and when the input refrigerant inlet side temperature is less than the second reference temperature. And a plate heat exchanger for stopping the operation of the compressor.        The method of claim 8,       In the plate heat exchanger, when the refrigerant and the number of heat sources flow to face each other, the first reference temperature is a value obtained by adding an error constant to the freezing temperature of the number of heat sources, and the second reference temperature is controlled to stop the first reference temperature. A control method of an air conditioner having a plate heat exchanger which is a value obtained by adding a necessary constant.        The method of claim 8,        When the coolant and the heat source number flow in parallel with each other in the plate heat exchanger, the first reference temperature is a value obtained by adding a pressure drop temperature and an error constant of the refrigerant to a freezing temperature of the heat source water, and the second reference temperature is the first reference temperature. 1 Control method of an air conditioner with a plate heat exchanger which is a value obtained by adding a constant control necessary constant to a reference temperature.        The method of claim 7, wherein       Sensing a low pressure side temperature of the compressor;      And determining a failure of a temperature sensor for detecting a temperature of the refrigerant inlet side of the plate heat exchanger using the sensed low pressure side temperature.        The method of claim 7, wherein       Sensing a low pressure side pressure of the compressor;      And determining a failure of a temperature sensor for detecting a refrigerant inlet side temperature of the plate heat exchanger using the sensed low pressure side pressure.
KR1020080120556A 2008-12-01 2008-12-01 Air conditioner having plate heat exchanger and controlling method of the same of KR20100062117A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101303239B1 (en) * 2011-10-28 2013-09-04 엘지전자 주식회사 Air conditioner and method for controlling the same
WO2018072431A1 (en) * 2016-10-18 2018-04-26 广东美的暖通设备有限公司 Fresh air handling unit control method and fresh air handling unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101303239B1 (en) * 2011-10-28 2013-09-04 엘지전자 주식회사 Air conditioner and method for controlling the same
WO2018072431A1 (en) * 2016-10-18 2018-04-26 广东美的暖通设备有限公司 Fresh air handling unit control method and fresh air handling unit
US11098917B2 (en) 2016-10-18 2021-08-24 Gd Midea Heating & Ventilating Equipment Co., Ltd. Method for controlling fresh air machine and fresh air machine

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