WO2019240338A1 - Method for controlling operation of automatically cleanable heat exchanger - Google Patents

Abstract

The present invention relates to a method for controlling the operation of an automatically cleanable heat exchanger and, more specifically, to a method for controlling the operation of an automatically cleanable heat exchanger, the method allowing, when a heat pump is operating, water discharged from a pump to move to a heat exchanger such that heat exchange is performed by means of the heat exchanger, and allowing, when the heat pump is not operating, the water discharged from the pump to move to a cleaning nozzle line such that the heat exchanger is cleaned.

Description

Operation control method of automatic cleaning heat exchanger

The present invention relates to an operation control method for an automatic cleaning heat exchanger, and more particularly, to reduce power consumption, prevent fouling through periodic cleaning, and improve operation efficiency of an automatic cleaning heat exchanger. It is about a method.

In general, fouling is a phenomenon in which membranes are blocked by contaminants in influent during membrane filtration, and fouling is caused by various contaminants present in a fluid in a heat exchanger.

Looking at the prior art to solve this problem, first, there is a method of circulating the cleaning liquid, but this causes an environmental problem in the cleaning liquid treatment process. Secondly, there is a method of cleaning using ultrasonic waves, but this is expensive and limited in the heat exchanger structure applicable. Finally, there is a method of disassembling the heat exchanger and washing the person directly with a brush, but this also requires a labor force, and in the case of difficulty in accessing the person, there is a difficulty in cleaning the heat exchanger.

As a related art for cleaning a heat exchanger except for the above-described problems, there is, for example, Korean Laid-Open Patent No. 0055324 ('Automatic cleaning device for heat exchanger'). This is a way to circulate a pair of brushes inside the heat exchanger to clean the inside of the pipe, which requires a device to move the brushes and the hassle of constantly changing brushes.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, and its object is to automatically clean the heat exchanger without consuming additional power.

In addition, the present invention has another object to prevent the generation of fouling by periodic cleaning every time the heat pump is not running.

It is also an object of the present invention to automatically clean the heat exchanger without additional labor.

It is also an object of the present invention to provide a conditional customized automatic cleaning and to predict fouling generation and cleaning cycle.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another problem to be solved by the present invention not mentioned herein is to those skilled in the art from the following description. It will be clearly understood.

In the operation control method of the self-cleaning heat exchanger according to an embodiment of the present invention, the cleaning nozzle is provided on one side of the heat exchanger and the heat exchanger is a heat exchange between the refrigerant and water, so that the heat exchanger can be cleaned A heat pump including a line, a pump for supplying water to the heat exchanger and the cleaning nozzle line, and the heat exchanger, a heat pump for performing a refrigerant cycle, and a valve for controlling movement of water discharged from the pump, When the heat pump is in operation, the water discharged from the pump is moved to the heat exchanger to perform heat exchange by the heat exchanger. When the heat pump is inoperative, the water discharged from the pump is transferred to the washing nozzle line. It is moved and the heat exchanger is characterized in that the cleaning.

In addition, the cleaning nozzle line according to an embodiment of the present invention includes an inner cleaning nozzle line and the outer cleaning nozzle line, the valve, the first valve for moving the water discharged from the pump to the heat exchanger and the A second valve for moving the water discharged from the pump to the inner cleaning nozzle line, a third valve for moving the water discharged from the pump to the outer cleaning nozzle line, and at least one of the inner cleaning nozzle line or the outer cleaning nozzle line And a fourth valve for moving the water, which has passed through the outside, to the outside of the heat exchanger, and controls the valve according to the state of the heat pump.

In addition, in the operation control method of the self-cleaning heat exchanger according to an embodiment of the present invention, the first temperature sensor for detecting the temperature of the water in the water inlet pipe in the heat exchanger and the water of the water discharge pipe in the heat exchanger Further comprising a second temperature sensor for sensing a temperature, characterized in that for setting the cleaning time of the heat exchanger, the difference between the temperature of the water detected by the first temperature sensor and the second temperature sensor, respectively.

In addition, in the operation control method of the self-cleaning heat exchanger according to an embodiment of the present invention, the first pressure sensor for detecting the pressure of the water in the water inlet pipe in the heat exchanger and the water in the water discharge pipe in the heat exchanger Further comprising a second pressure sensor for detecting the pressure, characterized in that for setting the cleaning time of the heat exchanger, through the difference in the pressure of the water detected by the first pressure sensor and the second pressure sensor, respectively.

In addition, the heat exchanger according to an embodiment of the present invention further comprises a surface contamination tester for measuring the degree of contamination of the water, by measuring the degree of contamination of the water through the surface contamination tester, to set the cleaning time of the heat exchanger It is characterized by.

By the means for solving the above problems, the operation control method of the self-cleaning heat exchanger of the present invention has the effect that it can automatically clean the heat exchanger without consuming additional power.

In addition, the operation control method of the self-cleaning heat exchanger according to the present invention has the effect of preventing the generation of fouling by periodic cleaning every time the heat pump is not running.

In addition, the operation control method of the self-cleaning heat exchanger according to the present invention has the effect of automatically cleaning the heat exchanger without additional labor.

In addition, the operation control method of the self-cleaning heat exchanger according to the present invention provides a condition-specific customized automatic cleaning, it is effective in predicting the fouling generation and cleaning cycle.

1 is a view showing the shape of the self-cleaning heat exchanger according to an embodiment of the present invention.

2 is a view showing a driving circuit of the self-cleaning heat exchanger according to an embodiment of the present invention.

3 is a view showing a circuit when driving the heat pump of the self-cleaning heat exchanger according to an embodiment of the present invention.

4 is a view showing a circuit when the heat pump is not driven of the self-cleaning heat exchanger according to an embodiment of the present invention.

Figure 5 is a flow chart showing the operation logic of the self-cleaning heat exchanger according to an embodiment of the present invention.

6 is a view showing a control flow of the self-cleaning heat exchanger according to an embodiment of the present invention.

7 is a view showing a driving circuit including a temperature sensor of the self-cleaning heat exchanger according to an embodiment of the present invention.

8 is a flow chart showing the temperature-based operating logic of the self-cleaning heat exchanger according to an embodiment of the present invention.

9 is a view showing a driving circuit including a pressure sensor of the self-cleaning heat exchanger according to an embodiment of the present invention.

10 is a flow chart showing a pressure-based operating logic of the self-cleaning heat exchanger according to an embodiment of the present invention.

11 is a view showing a driving circuit including a surface contamination tester of the self-cleaning heat exchanger according to an embodiment of the present invention.

12 is a flowchart showing the surface contamination inspection-based operation logic of the self-cleaning heat exchanger according to an embodiment of the present invention.

Terms used herein will be briefly described and the present invention will be described in detail.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the functions in the present invention, but this may vary according to the intention or precedent of the person skilled in the art, the emergence of new technologies and the like. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the contents throughout the present invention, rather than the names of the simple terms.

When a part of the specification is said to "include" any component, this means that it may further include other components, except to exclude other components unless otherwise stated.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Specific matters including the problem to be solved, the means for solving the problem, and the effects of the present invention are included in the following embodiments and the drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

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

1 to 2, the present invention is provided on one side of the heat exchanger 100 and the heat exchanger 100 is a heat exchange between the refrigerant and water, so that the heat exchanger 100 can be cleaned Including a cleaning nozzle line 200, the heat exchanger 100 and the pump 300 for supplying water to the cleaning nozzle line 200 and the heat exchanger 100, the heat to allow the refrigerant cycle can be performed A pump (not shown) and the valve 500 for controlling the movement of the water discharged from the pump 300.

When the heat pump (not shown) is in an operating state, water discharged from the pump 300 is moved to the heat exchanger 100 to perform heat exchange by the heat exchanger 100, and the heat pump ( If not shown), the water discharged from the pump 300 is moved to the cleaning nozzle line 200 to clean the heat exchanger 100.

The cleaning nozzle line 200 includes an inner cleaning nozzle line 210 and an outer cleaning nozzle line 220. The inner cleaning nozzle line 210 and the outer cleaning nozzle line 220 includes an inner nozzle 211 and an outer nozzle 221, respectively, and are provided in plural on one side of the heat exchanger. In FIG. 1, although the inner nozzle 211 and the outer nozzle 221 are arranged symmetrically about the heat exchanger 100, the injection angles of the inner nozzle 211 and the outer nozzle 221 and the Various arrangements are possible depending on the size of the heat exchanger 100. For example, the inner nozzle 211 and the outer nozzle 221 are arranged in a circular shape, but six pairs are installed at an interval of 60 ° so that the heat exchanger 100 can be uniformly cleaned.

The pump 300 preferably has an output capable of providing a hydraulic pressure required by the heat exchanger 100. When the state of the water discharged through the pump 300 is not good, the supply of water to the inner nozzle 211 and the outer nozzle 221 can be replaced with water. In addition, it may be provided with a plurality of pumps that can replace the pump 300 as necessary.

The refrigerant supplier 400 supplies the refrigerant to the heat exchanger 100 through the refrigerant pipe 410 in the same manner as the apparatus for supplying the existing refrigerant as a basic component to the heat exchanger 100.

The valve 500 may include a first valve 510 for moving the water discharged from the pump 300 to the heat exchanger 100 and water discharged from the pump 300 to the inner cleaning nozzle line 210. The third valve 530 and the inner washing nozzle line 210 or the outer washing to move the second valve 520 and the water discharged from the pump 300 to the outer cleaning nozzle line 220 And a fourth valve 540 for moving the water that has passed through at least one of the nozzle lines 220 to the outside of the heat exchanger 100. According to the state of the heat pump (not shown), the valve ( 500).

For example, the operation schedule of the air conditioning system is set in multiple facilities such as underground stations. That is, when the air conditioning system is in the non-operation state because the non-operation time or the room temperature is below the operation temperature (cooling reference), the heat exchanger 100 is to be cleaned.

Referring to FIG. 3, when the heat pump (not shown) is driven, water discharged from the pump 300 moves to the heat exchanger 100. That is, the first valve 510 is opened, and the second valve 520, the third valve 530, and the fourth valve 540 are all closed. Referring to FIG. 4, when the heat pump (not shown) is not driven, water discharged from the pump 300 moves to the cleaning nozzle line 200. That is, the first valve 510 is closed and both the second valve 520, the third valve 530, and the fourth valve 540 are opened.

Next, the basic embodiment of the present invention will be described in detail with reference to FIG. First, the present invention may further include a control unit 900 for controlling the valve 500.

First, an operation schedule of the heat pump (not shown) is input. (S1) Next, the controller 900 determines whether the heat pump (not shown) is in an operation period. If the control unit 900 determines that the heat pump (not shown) is the operation period, it is determined whether the indoor temperature is higher than the set operating temperature. (S3) The operation performed by the control unit 900 at the indoor temperature is set. If it is determined that the temperature is higher than the temperature, the first valve 510 is opened to allow the water discharged from the pump 300 to move to the heat exchanger 100. (S4) The control unit 900 sets the room temperature. When it is determined that the temperature is lower than the operating temperature, the first valve 510 is closed and the fourth valve 540 is opened to discharge all the water remaining in the heat exchanger 100. Input the cleaning time of 100) (S6).

If the control unit 900 determines that the heat pump (not shown) is not an operation period in step S2, the control unit 900 proceeds to step S6 for inputting a cleaning time. Next, simultaneously open both the second valve 520 and the third valve 530 to clean the heat exchanger 100 (S7) and the second valve 520 to open the third valve An inner cleaning mode S8 for closing only 530 to clean only the inside of the heat exchanger 100, and closing the second valve 520, opening the third valve 530 to open the third heat exchanger 100. One of the external cleaning modes S9 for cleaning the outside is selected to clean the heat exchanger 100. When the cleaning of the heat exchanger 100 is finished (S10), the cleaning cycle time of the heat exchanger 100 is input. (S11) After that, the control unit 900 terminates the cleaning on the basis of the input cleaning cycle time. (S10) When the controller 900 determines that the cleaning of the heat exchanger 100 is finished, the first valve 510 is opened and the fourth valve 540 is closed. )

Through this, the heat pump 100 may be always cleaned at a time when the heat pump (not shown) is not operated. The cleaning time and the cleaning cycle of the heat exchanger 100 may be input according to a user's preference. The heat exchanger 100 may be cleaned only at a desired time. In addition, the outside and the inside of the heat exchanger 100 may be independently cleaned according to the required flow rate, and both the outside and the inside of the heat exchanger 100 may be washed. Accordingly, the user may set the cleaning time and the cleaning cycle according to the situation, and designate the desired cleaning position of the heat exchanger 100.

As a result, the heat exchanger 100 is periodically cleaned without removing the heat exchanger 100 to prevent the generation of fouling. Through this it is possible to maintain the performance of the heat exchanger (100).

Next will be described in detail the method for precisely cleaning the heat exchanger 100 by measuring the fouling degree of the heat exchanger (100).

Referring to FIG. 7, the first temperature sensor 610 for detecting the temperature of the water in the water inlet pipe 110 in the heat exchanger 100 and the temperature of the water in the water discharge pipe 120 in the heat exchanger 100 are measured. It further comprises a second temperature sensor 620 for sensing.

The controller 900 sets the cleaning time of the heat exchanger 100 through the difference in the temperature of the water detected by the first temperature sensor 610 and the second temperature sensor 620, respectively. Referring to FIG. 8, first, an operation schedule of the heat pump (not shown) is input. (T2) Next, the controller 900 determines whether the heat pump (not shown) is in an operation period. (T3) If the control unit 900 determines that the heat pump (not shown) is the operating period, it is determined whether the room temperature is higher than the set operating temperature. (T4) The control unit 900 If it is determined that the room temperature is higher than the set operating temperature, the first valve 510 is opened to allow the water discharged from the pump 300 to move to the heat exchanger 100. (T5) After that, the heat pump During the driving time (not shown), the temperature difference between the water inlet pipe 110 and the water discharge pipe 120 is calculated and stored through the first temperature sensor 610 and the second temperature sensor 620. In operation T6, the controller 900 determines whether the temperature difference of the water is equal to or less than the allowable temperature difference. (T7) When the controller 900 determines that the temperature difference between the water is equal to or less than the allowable temperature difference, the control unit 900 ends. When the controller 900 determines that the temperature difference of the water is greater than or equal to the allowable temperature difference, the controller 900 closes the first valve 510 and opens the fourth valve 540 to enter the cleaning mode.

If the control unit 900 determines that the room temperature is lower than the set operating temperature, the first valve 510 is closed and the fourth valve 540 is opened to discharge all the water remaining in the heat exchanger 100. (T9) After that, the cleaning time of the heat exchanger 100 is input. (T10) Next, the process proceeds as follows.

If the control unit 900 determines that the heat pump (not shown) is not in the operation period in step T3, the first valve 510 is closed and the fourth valve 540 is opened. Thereafter, the initial cleaning time is input. (T10) Next, the simultaneous cleaning mode T12 and the second cleaning method of cleaning the heat exchanger 100 by opening both the second valve 520 and the third valve 530. 2 the valve 520 is opened, the third valve 530 is closed to clean only the inside of the heat exchanger 100, and the inner cleaning mode T13, and the second valve 520 is closed, the third valve 530 is opened to select one of the outer cleaning modes T14 for cleaning only the outside of the heat exchanger 100 to clean the heat exchanger 100. When the controller 900 determines that the cleaning of the heat exchanger 100 is finished (T15), the first valve 510 is opened and the fourth valve 540 is closed (T16).

In brief, the heat transfer performance of the heat exchanger 100 is reduced during fouling generation. As a result, the temperature difference between the water in the water inlet pipe 110 and the water discharge pipe 120 is increased. By using this, the fouling degree of the heat exchanger 100 can be measured, and the precise cleaning driving of the heat exchanger 100 is possible. That is, the cleaning is automatically completed by stopping or repeating cleaning according to the degree of cleaning improvement on the basis of the initial cleaning time input. In addition, the fouling phenomenon of the heat exchanger 100 may be predicted based on the stored data to predict the cleaning cycle, and the performance of the heat exchanger 100 may be easily maintained.

Table 1 below shows one embodiment according to the flowchart of FIG. 8.

step	Initial entrance and exit temperature difference (℃)	Inlet and outlet temperature difference (℃)	Water temperature difference comparison (℃)	Allowable temperature difference (℃)	Cleaning time (min.)	Additional cleaning time (min.)	Total cleaning time (min.)	compare
	A	B	A-B	C		Add for (A-B)> C
One	10	5	5	One	5	One	6
2	10	6	4	One	6	One	7
3	10	7	3	One	7	One	8
4	10	7.8	2.2	One	8	One	9
5	10	8.5	1.5	One	9	One	10
6	10	9.1	0.9	One	0	0	0	Cleaning

Next, referring to FIGS. 9 and 10, the first pressure sensor 710 detecting the pressure of the water in the water inlet pipe 110 in the heat exchanger 100 and the water discharge pipe in the heat exchanger 100 are described. Further comprising a second pressure sensor 720 for detecting the pressure of the water in the 120, the heat exchanger through the difference in the pressure of the water respectively detected by the first pressure sensor 710 and the second pressure sensor 720, The washing time of 100 is set. In addition, referring to Figures 11 and 12, the heat exchanger 100 further includes a surface contamination tester 800 for measuring the degree of contamination of the water, by measuring the degree of contamination of the water through the surface contamination tester 800 Set the cleaning time of the heat exchanger (100). That is, it includes all types of sensors capable of measuring the fouling of the heat exchanger (100).

As such, it will be understood by those skilled in the art that the above-described technical configuration may be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

Claims (5)

1. A heat exchanger for performing heat exchange between the refrigerant and water;

   A cleaning nozzle line provided at one side of the heat exchanger to allow the heat exchanger to be cleaned;

   A pump for supplying water to the heat exchanger and the cleaning nozzle line;

   A heat pump including the heat exchanger to perform a refrigerant cycle; And

   And a valve controlling a movement of water discharged from the pump.

   When the heat pump is operating, the water discharged from the pump is moved to the heat exchanger to perform heat exchange by the heat exchanger,

   And when the heat pump is in an inoperative state, water discharged from the pump is moved to a cleaning nozzle line to clean the heat exchanger.
2. The method of claim 1,

   The cleaning nozzle line is an inner cleaning nozzle line; And an outer cleaning nozzle line;

   The valve,

   A first valve for moving the water discharged from the pump to the heat exchanger;

   A second valve for moving the water discharged from the pump to the inner cleaning nozzle line;

   A third valve for moving the water discharged from the pump to the outer cleaning nozzle line; And

   And a fourth valve for moving water from at least one of the inner cleaning nozzle line and the outer cleaning nozzle line to the outside of the heat exchanger.

   And operating the valve according to the state of the heat pump.
3. The method of claim 2,

   A water inlet pipe in the heat exchanger; a first temperature sensor for sensing a temperature of water in the water; And

   And a second temperature sensor configured to detect a temperature of water in the water discharge tube in the heat exchanger.

   And a cleaning time of the heat exchanger is set based on a difference in temperature of the water sensed by the first temperature sensor and the second temperature sensor, respectively.
4. The method of claim 2,

   A water inlet pipe in the heat exchanger; a first pressure sensor for detecting a pressure of water in the water; And

   And a second pressure sensor configured to detect a pressure of water in the water discharge tube in the heat exchanger.

   And a cleaning time of the heat exchanger is set based on a difference in water pressure detected by the first pressure sensor and the second pressure sensor, respectively.
5. The method of claim 2,

   The heat exchanger further comprises a surface contamination tester for measuring the degree of contamination of the water. Operation control method.

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