KR20110090176A - Heat exchange system and method for controlling the same - Google Patents

Abstract

PURPOSE: A heat exchange system and a control method thereof are provided to use natural energy more efficiently by supplementing disadvantages. CONSTITUTION: A heat exchange system comprises a refrigerant circulating line, a refrigerant driving unit, a water-side heat exchanger(300), a water-side circulating line, a water-side pump, an air-side heat exchanger, an air fan, a fan motor, a load-side heat exchanger and a temperature sensor. Refrigerant can circulate in the refrigerant circulating line. An inlet and an outlet are formed on the refrigerant circulating line so the refrigerant driving unit circulates the refrigerant in the refrigerant circulating line. The water-side heat exchanger is installed on a water heat-source of the refrigerant circulating line.

Description

Heat exchange system and its control method {HEAT EXCHANGE SYSTEM AND METHOD FOR CONTROLLING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange system and a control method thereof, which obtain heat from a heat source, heat the load side, or transfer heat from the load side to a heat source to cool the load side, and a control method thereof.

Alternative energy refers to solar energy, marine energy, waste energy and geothermal energy, not coal, oil, nuclear power and natural gas. Among these alternative energy, research on natural energy such as wind, solar, geothermal, etc. has been conducted for a long time, and power generation and cooling and heating devices using the same have been installed and used.

While these natural energy materials have the advantage of obtaining infinite energy with little impact on environmental pollution and climate change, each special characteristic satisfies all the special conditions in energy conversion, transportation, storage and use. Since the energy density is very low and economic feasibility must be secured, it is a problem to develop natural energy technology that satisfies all of them.

Geothermal source heat pump air-conditioning system that uses geothermal heat as a heat source for heating and cooling is equipped with a heat exchanger to recover the heat from the ground or heat the ground using heat sources such as ground, groundwater, and surface water. As a technology for heating and cooling, the system is more efficient and environmentally friendly than other heat source heat pumps.

Among the geothermal source heat pump air-conditioning system, wastewater heat source air-conditioning system using waste heat such as living sewage and wastewater discharged from urban areas shows that the sewage heat ranges from about 20 ~ 25 ℃ in summer and about 10 ~ 15 ℃ in winter. In addition to the large amount, the temperature is high in winter and cool in the summer, but it is an appropriate energy source, but the waste water is discarded irregularly, so the stability of the sewage heat source is insufficient, which leads to a problem in the operation rate of the heating and cooling system.

The present invention compensates for the shortcomings of natural energy, and provides a heat exchange system and a method of controlling the same so that natural energy can be used more efficiently.

The present invention to solve the above problems, the refrigerant circulation line that the refrigerant can be circulated; A refrigerant driving unit having an inlet and an outlet formed in the refrigerant circulation line to circulate the refrigerant in the refrigerant circulation line; A heat receiving source side heat exchanger installed at the heat receiving source side of the refrigerant circulation line; A hydrothermal source side circulation line connecting between the hydrothermal source and the hydrothermal source side heat exchanger; A hydrothermal source side pump installed at the hydrothermal source side circulation line and circulating fluid in the hydrothermal source side circulation line; An air heat source side heat exchanger installed at an air heat source side of the refrigerant circulation line; An air fan installed in the air heat source side heat exchanger to promote air flow; An air fan drive motor for driving the air fan; A load side heat exchanger installed at the load side of the refrigerant circulation line; And a temperature sensor provided to measure the load side temperature.

Here, the air fan drive motor is preferably a speed control motor.

In addition, the bypass refrigerant line connecting the refrigerant circulation line at both ends of the air heat source side heat exchanger; And an electric valve installed at a portion at which the refrigerant circulation line and the bypass refrigerant line are connected to control the refrigerant to selectively flow to the air heat source side heat exchanger or the bypass refrigerant line.

In addition, the refrigerant circulation line, the inlet port and the outlet port are all connected, it is effective to further include a four-way valve that can switch the refrigerant circulation direction.

Meanwhile, another category of the present invention provides a method of controlling a heat exchange system. A method of controlling a heat exchange system includes operating the water heat source side pump; Driving the refrigerant driver; An initial operation step of maximally operating the air fan driving motor when the temperature sensor is out of a set temperature; Reducing the output of the air fan drive motor when the temperature sensor is located in a set temperature range after the initial start-up step; Stopping the air fan driving motor when the temperature sensor is longer than a set time within a set temperature range; Even after stopping the air fan drive motor, if the temperature measured by the temperature sensor is located in the range of the set temperature for a predetermined time or more, stopping the operation of the water source pump, stopping the drive of the refrigerant driving unit; It is characterized by including.

As described above, according to the present invention, various effects including the following can be expected. However, the present invention does not necessarily achieve the following effects.

First, the present invention provides a heat exchange system and a method of controlling the same to compensate for the disadvantages of natural energy and to use natural energy more efficiently.

In addition, by adopting a speed control motor for the air fan drive motor, it is possible to finely adjust the heat exchange amount.

By providing the bypass refrigerant line and the electric valve, unnecessary load can be eliminated when the air heat source side heat exchanger is not used.

1 is a conceptual diagram when cooling the heat exchange system of an embodiment of the present invention
2 is a conceptual diagram when heating of FIG.
FIG. 3 is a flowchart illustrating a method of controlling the heat exchange system of FIG. 1 for cooling.
4 is a flow chart illustrating a method of controlling the heat exchange system of FIG. 2 for heating;

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

1 is a conceptual diagram when cooling the heat exchange system of the embodiment of the present invention, Figure 2 shows a conceptual diagram when heating of FIG.

As shown in FIG. 1, the heat exchange system according to an exemplary embodiment of the present invention has a refrigerant circulation line 100 through which refrigerant may circulate, and an inlet and an outlet outlet circulate the refrigerant to circulate the refrigerant in the refrigerant circulation line 100. Between the coolant driver 200 connected to the line 100, the heat source side heat exchanger 300 installed on the heat source side of the refrigerant circulation line 100, and the heat source 410 and the heat source side heat exchanger 300. A heat source side circulation line 420 connected to the heat source side circulation line 420, a heat source source side pump 430 for circulating fluid in the heat source side circulation line, and an air heat source side of the refrigerant circulation line An air heat source side heat exchanger 500 installed in the air heat source side heat exchanger 500 and an air fan 510 for promoting air flow, and an air fan drive motor for driving the air fan 510. 520 and the load 610 of the refrigerant circulation line 100 are installed. A load side heat exchanger 620 and a temperature sensor 710 installed to measure the load side temperature.

The refrigerant driving unit 200 includes a compressor 220 for circulating a refrigerant, an accumulator 210, and a high pressure low pressure switch 240. An inlet 211 is connected to the accumulator 210 and connected to the compressor 220. The outlet 221 is connected. Inlet 211, outlet 221 and the refrigerant circulation line 100 is a four-way valve (230: 4-way valve) is connected, when used in the same position as in Figure 1, used for cooling, as shown in Figure 2 If in position, it is used for heating.

The high pressure low pressure switch 240 is used to stop the operation of the compressor 220 when a predetermined high pressure is applied, and to drive the compressor 220 when a low pressure below the set value is applied, and is generally used. Will be. In addition, since the compressor 220 and the accumulator 210 are widely used in general hydraulic equipment, detailed description thereof will be omitted.

The heat source side heat exchanger 300 is a device for exchanging heat transferred from the heat source 410 via water, and the refrigerant flowing in the refrigerant line 100 and the heat source side circulation line 420 on the side of the heat source 410. The water flowing from the ()) flows adjacent to each other, so as to transfer heat. Since a specific configuration of such a heat exchanger is generally known, a detailed description thereof will be omitted. The heat source 410 may be a variety of environmentally friendly heat sources such as geothermal, sewage heat. The fluid used as the heat source side refrigerant may be water, but other refrigerants may be used.

The air heat source side heat exchanger 500 is a heat exchange occurs in the refrigerant in the refrigerant circulation line 100 by the air. The air fan drive motor 520 is a motor capable of speed control, and typically uses a direct current motor. In this way, the air fan drive motor 520 is capable of controlling the speed, so that additional heat exchange may be performed as necessary.

A bypass refrigerant line 530 connecting the refrigerant circulation line 100 at both ends of an air heat source side heat exchanger 500 is installed, and the refrigerant circulation line 100 and the bypass refrigerant line 530 are connected to each other. An electric valve 540 is installed to control the refrigerant to selectively flow to the air heat source side heat exchanger 500 or the bypass refrigerant line 530.

In this way, when the air fan driving motor 520 is not operated, the refrigerant flows to the bypass refrigerant line 530, so that the loss of power that may occur while the refrigerant passes through the air heat source side heat exchanger 500. It can prevent (due to the occurrence of load).

The temperature sensor 710 measures the temperature at the load side and, as shown in FIG. 1, measures the temperature of the refrigerant in the load-side circulation line 630 after exchanging heat in the load-side heat exchanger 620, or at the load ( It may be installed to directly measure the temperature of the 610, or to measure the temperature of the position where the temperature of the load 610 can be estimated. The temperature sensor can be installed in various locations as needed. That is, temperature sensors 710-714 may be installed at various locations as shown in FIG. 1. In addition, various sensors may be installed in addition to the temperature sensor. Typically, a pressure sensor 715 may be installed to measure the pressure of the refrigerant circulation line.

The controller 800 receives the measured values from each of the temperature sensors 710 to 714 and the pressure sensor 715, and then, based on this, the water heat source side pump 430, the refrigerant driving unit 200, and the air fan driving motor ( 520 is controlled. The control operation of the controller 800 is replaced with the detailed description of the method of controlling the heat exchange system described later.

3 is a flowchart illustrating a method of controlling the aforementioned heat exchange system for cooling.

As shown in FIG. 3, the method of controlling a heat exchange system includes: operating 1040 the water heat source side pump 430, driving 1050 the refrigerant driving unit 200, and the temperature sensor When the temperature 710 is out of the set temperature (first determination step: 1060), the initial operation step (1120) for maximum operation of the air fan drive motor, and the temperature sensor after the initial operation step (1120) When it is located in the range of the set temperature (second determination step: 1130), the step of reducing the output of the air fan drive motor (1140), and when the temperature sensor is longer than the time set in the set temperature range (fourth determination) Step: 1190), the step of stopping the air fan drive motor 420 (1200), and even after stopping the air fan drive motor 520, the temperature measured by the temperature sensor is a range of the set temperature for a predetermined time or more (6th judging step: 1080), the number And stopping the operation of the pump Woncheuk, and a step 1090 to stop the driving of the cooling medium drive.

Before operating the pump 430 (1040), the step of setting the cooling / heating (1010), the step of driving the four-way valve 230 in accordance with the selected cooling / heating mode (1020), It may include a step 1030 of setting a set value (Ts). Step 1010 of setting the cooling / heating is a step of setting whether to set the load side to the cooling mode or the heating mode. In operation 1020, the four-way valve 230 drives the four-way valve 230 to be connected to the inlet 211 and the outlet 221 in the cooling mode, and in the heating mode, as shown in FIG. 1. As described above, the inlet 211 and the outlet 221 are driven to the four-way valve 230 to be connected. 3 illustrates a control method in the cooling mode.

The operation 1040 of the pump 430 and the operation 1050 of the driving of the refrigerant driving unit 200 are illustrated in sequence, but the operation of the driving unit of the refrigerant driving unit 200 is not necessary. Step 1050 may occur first, or may be driven at the same time. In operation 1050, the refrigerant driving unit 200 is driven by the compressor 220.

An operation 1110 of driving the electric valve 540 is included between the first determination step 1060 and the initial operation step 1120. In operation 1110 of driving the electric valve 540, the refrigerant flows in the air heat source side heat exchanger 500.

The initial operation step 1120 drives the air fan drive motor 520 to the maximum, and operates the heat exchange capacity of the air heat source side heat exchanger to the maximum value. Thereafter, by gradually decreasing the speed of the air fan driving motor 250, it is possible to maximize energy efficiency.

Between the second determination step 1130 and the fourth determination step 1190, a step 1150 of measuring the temperature of the temperature sensor 710, and a third step of comparing and determining the measured value of T1 and the value of Ts The determination step 1160 and the step 1180 of reducing the output of the air fan driving motor 510 when the value of T1 is lower in the third determination step are performed. After performing step 1170 of further increasing the output, the step 1150 of measuring the temperature of the temperature sensor is repeated again.

After the step 1200 of stopping the air fan drive motor, the method further includes a step 1220 of driving the electric valve 540 to flow the refrigerant to the bypass refrigerant line 530, the refrigerant is bypass gas refrigerant line If T1 does not satisfy the condition lower than Ts for a predetermined time period after comparing the T1 value and the Ts value after the step 1200 of stopping the air fan driving motor before the step 1220 of allowing the flow to 530. The method may further include a fifth determination step 1210 for re-running from the activation step 1120.

The state maintaining operation 1070 is an operation of maintaining the state in which the refrigerant driving unit 200 and the pump 430 are driven while the air fan driving motor 520 is stopped and the refrigerant flows in the bypass refrigerant line 530. .

In the first determination step 1060, if T1 is less than or equal to Ts, the state maintenance operation 1070 is performed. If T1 is higher than Ts, step 1110 of driving the electric valve is performed. In the second determination step 1130, when the value measured by the temperature sensor is located in the range of the set temperature (T1 is equal to or less than Ts), a step (1140) of reducing the output of the air fan driving motor is performed. If the value is out of the set temperature range, the initial operation step 1120 is performed.

In the third determination step 1160, when the value measured by the temperature sensor is located in the range of the set temperature, the step 1180 of reducing the output of the air fan drive motor is performed. Step 1170 is performed to increase the output.

In the fourth determination step 1190, if the value measured by the temperature sensor lasts for the time set in the range of the set temperature, a step 1200 of stopping the air fan driving motor is performed, and when this condition is not satisfied, The third determination step 1160 is performed again by measuring the temperature of the temperature sensor again. The set time is a time input by the operator and can be set in consideration of the responsiveness and stability of the entire system.

In the fifth determination step 1210, when the value measured by the temperature sensor lasts for more than a time set in the range of the set temperature, the step 1220 of driving the electric valve to flow the refrigerant to the bypass refrigerant line is performed. If it does not continue, the initial start-up step 1120 is performed again.

In the sixth judging step 1080, when the value measured by the temperature sensor lasts for a predetermined time or more in the range of the set temperature, the operation of the water source pump is stopped and the driving of the refrigerant driving unit is stopped 1090. If it does not last longer than the set time, the first determination step 1060 is performed again.

4 is a flow chart illustrating a method of controlling the aforementioned heat exchange system for heating.

FIG. 4 is different from FIG. 3 only in the first to sixth determination steps, and thus description of the rest will be omitted.

In the first determination step 2060, if T1 is equal to or greater than Ts (when located in the set temperature range), the state maintaining operation 1070 is performed, and if T1 is lower than Ts, driving 1110 of the electric valve is performed. Perform. In the second determination step 2130, when the value measured by the temperature sensor is located in the range of the set temperature (T1 is Ts or more), a step (1140) of reducing the output of the air fan driving motor is performed and measured by the temperature sensor. If the value is out of the set temperature range, the initial operation step 1120 is performed.

In the third determination step 2160, when the value measured by the temperature sensor is located in the range of the set temperature, the step 1180 of reducing the output of the air fan drive motor is performed. Step 1170 is performed to increase the output.

In the fourth determination step 2190, when the value measured by the temperature sensor lasts for the time set in the set temperature range, the air fan driving motor is stopped (1200). If the condition is not satisfied, The third determination step 2160 is performed again by measuring the temperature of the temperature sensor again. The set time is a time input by the operator and can be set in consideration of the responsiveness and stability of the entire system.

In the fifth determination step 2210, when the value measured by the temperature sensor lasts for more than the time set in the range of the set temperature, the step 1220 of driving the electric valve to flow the refrigerant to the bypass refrigerant line is performed. If it does not continue, the initial start-up step 1120 is performed again.

In the sixth determination step 2080, when the value measured by the temperature sensor lasts for more than the time set in the set temperature range, the operation of the water source pump is stopped and the operation of the refrigerant driving unit is stopped 1090. If it does not last longer than the set time, the first determination step 1060 is performed again.

As described above, the heat exchange system of the embodiment of the present invention and a method for controlling the same can be cooled by using a heat source using a natural energy source, such as geothermal source, sewage heat, etc., thereby reducing costs Not only that, there is an advantage that the use of a variable air heat source can compensate for the shortcomings of nature-friendly energy sources.

100: refrigerant circulation line 211: inlet
221: outlet 200: refrigerant driving unit
300: heat source side heat exchanger 410: heat source
420: water source side circulation line 430: water source side pump
500: air heat source side heat exchanger 510: air fan
520: air fan drive motor 620: load side heat exchanger
710: temperature sensor 530: bypass refrigerant line
540: electric valve 230: four-way valve

Claims (7)

A refrigerant circulation line through which the refrigerant can circulate;
A refrigerant driving unit having an inlet and an outlet formed in the refrigerant circulation line to circulate the refrigerant in the refrigerant circulation line;
A heat receiving source side heat exchanger installed at the heat receiving source side of the refrigerant circulation line;
A hydrothermal source side circulation line connecting between the hydrothermal source and the hydrothermal source side heat exchanger;
A hydrothermal source side pump installed at the hydrothermal source side circulation line and circulating fluid in the hydrothermal source side circulation line;
An air heat source side heat exchanger installed at an air heat source side of the refrigerant circulation line;
An air fan installed in the air heat source side heat exchanger to promote air flow;
An air fan drive motor for driving the air fan;
A load side heat exchanger installed at the load side of the refrigerant circulation line; And
A temperature sensor installed to measure the load side temperature;
Heat exchange system comprising a.
The method of claim 1,
The air fan drive motor is a heat exchange system, characterized in that the speed control motor.
The method of claim 1,
A bypass refrigerant line connecting the refrigerant circulation lines at both ends of the air heat source side heat exchanger; And
An electric valve installed at a portion at which the refrigerant circulation line and the bypass refrigerant line are connected to control the refrigerant to selectively flow to the air heat source side heat exchanger or the bypass refrigerant line;
A heat exchange system further comprising.
The method of claim 2,
A bypass refrigerant line connecting the refrigerant circulation lines at both ends of the air heat source side heat exchanger; And
An electric valve installed at a portion at which the refrigerant circulation line and the bypass refrigerant line are connected to control the refrigerant to selectively flow to the air heat source side heat exchanger or the bypass refrigerant line;
A heat exchange system further comprising.
The method according to any one of claims 1 to 4,
A four-way valve which is connected to the refrigerant circulation line, the inlet port, and the outlet port to switch the refrigerant circulation direction;
A heat exchange system further comprising.
A method of controlling the heat exchange system according to any one of claims 1 to 4,
Operating the hydrothermal source side pump;
Driving the refrigerant driver;
An initial operation step of maximally operating the air fan driving motor when the temperature sensor is out of a set temperature;
Reducing the output of the air fan drive motor when the temperature sensor is located in a set temperature range after the initial start-up step;
Stopping the air fan driving motor when the temperature sensor is longer than a set time within a set temperature range;
Stopping the operation of the coolant drive unit when the temperature measured by the temperature sensor is located within a set temperature range for a predetermined time or more even after stopping the air fan drive motor;
Method for controlling a heat exchange system comprising a.
A method of controlling the heat exchange system of claim 3 or 4, wherein
Operating the hydrothermal source side pump;
Driving the refrigerant driver;
When the temperature sensor is out of a set temperature, driving the electric valve to allow a coolant to flow to the air heat source side heat exchanger, and initially operating the air fan drive motor to the maximum;
Reducing the output of the air fan drive motor when the temperature sensor is located in a set temperature range after the initial start-up step;
Stopping the air fan driving motor when the temperature sensor is longer than a predetermined time in a set temperature range, and driving the electric valve to allow refrigerant to flow into the bypass refrigerant line;
Stopping the operation of the coolant driving unit when the temperature measured by the temperature sensor is located in a range of a set temperature for a predetermined time or more even after stopping the air fan driving motor;
Method for controlling a heat exchange system comprising a.

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