JP2006023007A - Heat exchange system and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the accuracy of abnormality determination in a heat exchange system using a liquid as heat medium. <P>SOLUTION: The heat exchange system for heating a liquid (water W) by a heat exchanger 24 and circulating the liquid to a radiation load to radiate the heat thereof comprises a tank (open tank 18) connected to passages (circulation passages 12, 14 and 16) for circulating the liquid to store the liquid; a liquid level detection means (water level sensor 42) detecting the level of the liquid in the tank; a pump (circulating pump 20) for circulating the liquid to the heat exchanger and the radiation load through the passages; a supply means (supply valve 38) for supplying the liquid to the passages or the tank; and a control means (control part 10) keeping the level within the tank in a predetermined range by making the supply means supply the liquid according to the level detected by the liquid level detection means, and generating, in a case that a detected level reaches an abnormal level, and this level is detected after driving the pump to circulate the liquid to the passages, an output showing abnormality. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a heat exchange system using a liquid such as warm water as a heat medium and a control method thereof.

  A heat exchange system using hot water or the like heated using combustion heat of a burner or the like as a heat source as a heat medium is used as a heating system that performs floor heating or room heating by circulating the heat medium to a heating terminal. ing. In such a system, the thermal expansion of the heat medium is absorbed by providing an open tank in the heat medium circuit for circulating the heat medium and opening it to the atmosphere. When the heat medium decreases due to natural evaporation or the like, it is necessary to replenish the heat medium and prevent air from entering the heat medium circuit.

  In such a heat exchange system, it is extremely important to know abnormalities in the heat medium such as liquid leakage in order to maintain stable heat exchange.

Regarding such a heat exchange system, there are the following prior patent documents.
Japanese Patent Application Laid-Open No. 2003-114056 discloses a technique for determining a liquid leakage abnormality in a heat exchange section based on a water level of a tank installed in a circulation path.

  By the way, in patent document 1, since the liquid leak of a heat exchange part is determined with the water level of a tank, and the water level change resulting from those other than a heat exchange part is not considered, there is a high risk of misjudgment and accuracy. Is lacking.

  Therefore, an object of the present invention is to provide a heat exchange system with improved accuracy of abnormality determination and a control method thereof.

To describe such an object in detail, the determination accuracy is improved by removing the cause of the level abnormality that occurs in the normal state when determining the abnormality due to the liquid level abnormality.

  In order to achieve the above object, a heat exchange system according to the present invention is a heat exchange system in which a liquid is heated by a heat exchanger, and the liquid is circulated to a heat radiation load to dissipate the heat. A tank connected to store the liquid; a liquid level detecting means for detecting a liquid level of the liquid in the tank; a pump for circulating the liquid to the heat exchanger and the heat radiation load through the circulation path; The liquid level in the tank is maintained within a predetermined range by supplying the liquid to the passage or the tank, and supplying the liquid to the supply unit according to the liquid level detected by the liquid level detection unit. In addition, when the detected liquid level reaches an abnormal liquid level, an output indicating an abnormality is output when the detected liquid level after driving the pump and circulating the liquid in the circulation path is an abnormal liquid level. System that occurs A configuration in which a unit.

  With such a configuration, the replenishment control of the liquid is performed according to the change in the liquid level of the tank, and the optimum liquid level necessary for heat exchange is maintained.However, when the abnormal liquid level is detected, the pump is turned on. Drive to perform forced circulation of liquid. As a result, the cause of the transient liquid level due to the abnormal liquid level due to air intrusion, liquid collapse, thermal expansion or the like in the flow path is eliminated. When the detected liquid level after forced circulation is an abnormal liquid level, it is determined that there is an abnormality, and the output is generated. Therefore, when the detected liquid level becomes an abnormal liquid level, it can be distinguished whether the detected liquid level is transient or abnormal, and the determination accuracy of the abnormality is improved.

  In order to achieve the above object, a temperature detection means for detecting the temperature of the liquid may be provided, and the control means may be configured to shift to an abnormality determination operation when the detected temperature is equal to or lower than a predetermined temperature. With such a configuration, the influence of the thermal expansion of the liquid accompanying a temperature rise can be avoided, and the abnormality determination operation at a predetermined temperature or higher is an unintended heating operation with air purge. No discomfort due to air purge is given to the user.

  In order to achieve the above object, a configuration may be provided that includes a display unit that displays an abnormal operation by the output of the control means. That is, the display of the abnormal operation of the display unit can be used as maintenance information.

  In order to achieve the above object, a control method for a heat exchange system according to the present invention is a control method for a heat exchange system in which a liquid is heated by a heat exchanger, and the liquid is circulated to a heat radiation load to dissipate the heat. A process for accumulating the liquid to be circulated to the exchanger and the heat radiating load, a process for detecting the liquid level in the tank, and forcibly circulating the liquid to the heat exchanger and the heat radiating load through the flow path. A process for replenishing the liquid to the flow path or the tank, and replenishing the liquid to the replenishing means according to the liquid level detected by the liquid level detecting means, thereby setting the liquid level in the tank within a predetermined range. And when the detected liquid level reaches an abnormal liquid level, the process determines that the detected liquid level is abnormal when the detected liquid level after forcibly circulating the liquid in the flow path is an abnormal liquid level. It is the structure containing these.

In order to achieve the above object, the process for determining the abnormality may include a process in which the liquid level in the tank refers to the occurrence frequency of the abnormal liquid level. With such a configuration, it is possible to avoid abnormality determination due to a temporary rise in liquid level such as water hammer action and thermal expansion, and it is possible to eliminate determination errors.

  According to the present invention, the following effects can be obtained.

  (1) Even if the detected liquid level generates an abnormal liquid level, it is possible to remove the one based on the cause of transient, improve the accuracy of abnormality determination, and realize a highly reliable heat exchange system Can do.

  (2) When determining an abnormality due to an abnormal liquid level, the cause of the level abnormality that occurs during normal operation is eliminated, so that the determination accuracy can be improved.

  (3) If the abnormality detection operation is performed when the detected temperature of the liquid is equal to or lower than the predetermined temperature, the user will not feel uncomfortable due to air purge in the flow path.

An embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an outline of a heating apparatus as an example of a heat exchange system and a control method thereof according to the present invention.

  This heating device 2 includes a control unit 10 (FIG. 2) as a control means for performing a heat source unit 4, heating terminals 6 and 8 as heat radiation loads, hot water heating control, supplementary liquid or system abnormality determination control, and the like. FIG. 1 shows a heat source unit 4 and heating terminals 6 and 8. The heat source unit 4 is composed of a heat exchanger or the like, the heating terminal 6 is composed of, for example, a fan convector as a high temperature heating terminal, and the heating terminal 8 is composed of, for example, a floor heating terminal as a low temperature heating terminal.

  The heat source unit 4 is provided with a plurality of circulation paths 12, 14, and 16 that circulate water W as a liquid constituting the heat medium. Each of the circulation paths 12, 14, and 16 is constituted by a copper pipe, a resin pipe, or the like. In the circulation path 12, an open tank 18, a circulation pump 20, a temperature sensor 22, a heat exchanger 24, a three-way branch portion 26, and the like are installed. The circulation path 12 is a circuit that circulates the water W in the open tank 18 to the heat exchanger 24 and the like, the circulation path 14 is a circuit that circulates the high-temperature water W to the heating terminal 6, and the circulation path 16 is the high-temperature water W. It is a circuit that circulates. The open tank 18 is a tank that stores water W and opens it to the outside air, and the circulation pump 20 is a means for forcibly circulating the water W through the circulation paths 12, 14, and 16. The temperature sensor 22 detects the temperature of the circulating water W. The heat exchanger 24 is used for heat exchange between the heat of combustion such as the combustion gas of the burner 25 and the water W as a heat source. Fuel gas is supplied to the burner 25 from a gas supply pipe via an open / close valve and a proportional valve (not shown). As a heat source of the heat exchanger 24, electric heat and other exhaust heat may be used as the heat source in addition to the combustion heat. Further, the heat exchanger 24 may be a liquid-liquid heat exchanger that performs heat exchange between the liquid heated by combustion heat, electric heat, and other exhaust heat and the water W.

  Then, the pipelines formed between the open tank 18 of the circulation path 12 and the three-way branch portion 26 are bypassed, and the circulation paths 14 and 16 are formed. The circulation path 14 constitutes a heating circuit branched by a three-way branching portion 26, and the heating terminal 6 is installed. The heating terminal 6 is provided with a thermal valve 28 that is opened and closed on the heating terminal 6 side. The circulation path 16 constitutes a heating circuit branched to the circulation path 12 by a low-temperature control valve 30, and the heating terminal 8 and the thermal valve 32 are installed. A branch circuit 34 is formed between the low-temperature control valve 30 and the circulation path 14 for mixing the water W, which is circulated on the circulation path 14 side and heated to the circulation path 16 side.

  Further, a supply pipe 36 is connected to the open tank 18 for supplying water W, and for example, clean water is used for supplying water W. The supply pipe 36 is provided with a supply valve 38 that is opened when supplying clean water. The open tank 18 is provided with an overflow pipe 40 for discharging the water W that has reached the overflow level.

  The open tank 18 is provided with a water level sensor 42 as a liquid level detecting means for detecting the liquid level. The water level sensor 42 electrically detects a low liquid level, a high liquid level, an abnormal liquid level, and the like. Therefore, the common electrode C44, the electrode L46, the electrode H48, and the electrode UL50 are installed. The range where the common electrode C44 and the electrode L46 are submerged is a low water level, the range where the common electrode C44 and the electrode H48 are submerged is the high water level, and the range where the common electrode C44 and the electrode UL50 are submerged is the abnormal water level.

  Next, the control unit 10 will be described with reference to FIG. FIG. 2 shows an example of the control unit 10.

  The control unit 42 includes, for example, a computer, and includes a processor 52, an interface (I / F) and analog / digital (A / D) conversion unit 54, an I / F 56, a ROM 58, a RAM 60, a clock unit 62, a drive unit 64, It includes an output unit 66, transmission / reception units 68, 70, etc., and receives detection signals and input signals from the temperature sensor 22, the water level sensor 42, etc., and generates various control outputs and drive outputs.

  The processor 52 is an arithmetic control unit comprising a CPU, and constitutes a time measuring unit such as an air purge interval timer and an air purge timer. As the time measuring means, a program timer may be used, or hardware may be used.

  The I / F and A / D converter 54 is an interface between the temperature sensor 22 and the processor 52 and converts the temperature detected by the temperature sensor 22 into a digital signal.

  The I / F 56 is an interface between the water level sensor 42 and the processor 52, and inputs a switching signal that is a detected water level of the water level sensor 42 to the processor 52.

  The ROM 58 stores control programs such as a hot water supply control program, a liquid level control program, an abnormality determination control program, and fixed data. The RAM 60 temporarily stores data that is being calculated. The clock unit 62 generates a clock signal, and this clock signal is used for timing of a system drive, various timers, an air purge interval timer, an air purge timer, and the like.

  Various drive outputs are obtained in the drive unit 64, and the opening and closing of the thermal valve 32, the low-temperature control valve 30, the replenishing valve 38, etc., and the driving and stopping of the circulation pump 20 are performed by this drive output.

  Then, the information presentation output obtained by the processor 52 is output from the output unit 66 to the information presentation unit 67, and information presentation or abnormality notification in the middle of control is performed. The information presentation unit 67 is configured with an LCD display or the like.

  Further, for example, a remote control device 72 is connected to the control unit 10 as an external control means, and this remote control device 72 exchanges information with the processor 52 via the transmission / reception unit 68. A signal indicating the start or stop of operation is input from the remote control device 72. Although not shown, the remote control device 72 is provided with an information presentation unit, and information such as operation information and abnormality information similar to the information presentation unit 67 is presented.

  The transmission / reception unit 70 is connected to a transmission / reception unit 74 of the heating terminal 6, and the transmission / reception unit 74 is connected to the thermal valve 28 via a control unit 76. The controller 10 opens and closes the thermal valve 28.

  If comprised in this way, the water W as a heat medium supplied to the open tank 18 will flow to the circulation path 12 by the drive of the circulation pump 20, and will circulate to the heat exchanger 24 and the heating terminals 6 and 8. FIG. An arrow A indicates the direction of circulation of the water W. The water W circulating in the heat exchanger 24 receives the combustion heat of the burner 25 and is heated.

  In this heat exchange operation, the water replenishment operation will be described. Water W is supplied to the open tank 18 through the replenishment pipe 36. When the circulation pump 20 is driven, the water W is circulated from the open tank 18 to the circulation path 12 and the like, and flows to the heat exchanger 24, the heating terminals 6 and 8, and the like. The water W is expanded by being heated by heat exchange in the heat exchanger 24. The expansion and the increase in the internal pressure of the circulation path 12 and the like are absorbed by the opening of the open tank 18 to the atmosphere, and the excess is externally supplied from the overflow pipe 40. To be discharged.

  By controlling the opening and closing of the low-temperature control valve 30, the flow rate on the branch circuit 34 side through which the high-temperature water W heated by the heat exchanger 24 and passed through the circulation path 14 is mixed with the flow rate of the water W from the open tank 18, The heat radiation temperature on the heating terminal 8 side can be adjusted.

  The heating terminal 6 is, for example, a fan convector as a high-temperature load terminal having a built-in thermal valve 28, and high-temperature water W heated by the heat exchanger 24 circulates. The thermal valve 28 is controlled by the heating terminal 6 and switches between water flow / water flow blocking of the high-temperature water W.

  The heating terminal 8 is a floor heating terminal, for example, as a low-temperature load terminal, and the low-temperature water W in which the high-temperature water W heated by the heat exchanger 24 and the water W from the open tank 18 are mixed circulates. . The thermal valve 32 is installed independently of the heating terminal 8 and is controlled by the control unit 10 to switch between low-temperature water W flow / water-blocking.

  The water level in the open tank 18 is detected by the water level sensor 42, and switching signals representing low water level from the electrode L46, high water level from the electrode H48, and abnormal water level from the electrode UL50 are taken out as detection signals, and these detection signals are sent to the control unit 10. Added. When the water level is low, the replenishing valve 38 is opened, water W is replenished, and the replenishment is performed up to the high water level.

  As a result of the use of heating of the heat exchanger 24 by the burner 25 or heat radiation by the heating terminals 6 and 8, moisture evaporation occurs, and when a detection signal below the low water level is detected from the detection level of the electrode L46, the supply valve 32 is turned on. The water replenishment operation is performed by opening, and water replenishment is performed until the electrode H48 detects a high water level.

  When the liquid level rises and an abnormal water level at which the electrode UL50 is at the upper limit level is detected, an abnormality may occur. The cause of the rise in the liquid level is due to water collapse or volume expansion of the heat medium due to heat in addition to liquid leakage from the replenishing valve 38, but these are not abnormal.

  Water collapse is a phenomenon in which air is mixed into the circulation paths 12, 14, and 16 due to the penetration of air into the piping through the piping. When the piping forming the circulation paths 12, 14, and 16 is, for example, a resin, Although it has water tightness, it is caused by low air tightness. In the circulation paths 12, 14, 16, particularly when the heating terminals 6, 8 are not used for a long time, the air enters the pipe to raise the liquid level in the open tank 18, thereby causing abnormal water levels. May be detected. Air purge is performed to eliminate the rise in liquid level caused by water collapse.

  Moreover, when the heating apparatus 2 is operated, the heating medium is heated, and the volume of the heating medium expands. The volume expansion of the heat medium may also raise the liquid level in the open tank 18 and detect an abnormal water level. In order to eliminate the rise in the liquid level caused by the volume expansion of the heating medium, the liquid level is detected again after the temperature of the heating medium is lowered by a predetermined temperature from the maximum temperature of the heating medium when the heating device 2 is operated.

  Next, water collapse detection control will be described with reference to FIG. FIG. 3 is a flowchart showing water collapse detection control which is an example of a control method of the heat exchange system.

  By setting the air purge interval timer to a predetermined time, the water collapse detection is performed every predetermined time. For example, it is performed once every 10 days (240 hours) (step S1), and water collapse is detected as an initial detection even when the power is turned on or when the power is restored. Since it is necessary to perform initial detection in order to operate the heating device safely, it is considered that 240 hours have elapsed when the power is turned on or when the power is restored. The water collapse detection involves an air purge process, and noise is generated during the air purge. Therefore, the time interval is set to avoid frequent noise generation.

  When the water collapse detection is started, the temperature of the water W on the outlet side of the open tank 18 is detected by the temperature sensor 22, and it is determined whether or not the detected temperature is lower than 40 ° C. (step S2). Since the water W flows through the heating terminals 6 and 8 during the air purge, when the temperature of the water W is 40 ° C. or higher, the heating terminals 6 and 8 are warmed and give the user an unpleasant feeling.

  If the temperature of the water W is less than 40 ° C., it is determined whether or not all the operations have been completed (step S3). When there is some other operation such as heating operation in the heating device, the air purge is not performed.

  It is determined whether or not the electrode UL50 detects an abnormal water level (UL = on) (step S4). A 10-second delay interval is set for detection to eliminate erroneous determination due to temporarily detecting an abnormal water level. If no abnormal water level is detected with a delay interval of 10 seconds, there is no abnormality.

  If the electrode UL50 detects an abnormal water level in step S4, air circulation of the circulation paths 12, 14, and 16 is performed (step S5).

  When the air purge is completed, the air purge interval timer is initialized (step S6).

  It is determined whether or not the electrode UL50 has detected an abnormal water level (UL = on) (step S7). If the level has not been detected, there is no abnormality and the process returns to step S1. In this case, it is estimated that the rise in the liquid level in the open tank 18 is due to water collapse. If an abnormal water level is detected, an abnormality is displayed (step S8).

  Next, the air purge operation will be described with reference to FIG. FIG. 4 is a flowchart showing an air purge operation as an example of a control method of the heat exchange system.

  The air purge is started after distinguishing whether the connected heating terminal is not dropped. In the present embodiment, air purge is performed only on the connected heating terminals. That is, the air purge of the heating terminal 6 which is a high temperature load terminal and the heating terminal 8 which is a low temperature load terminal is performed. In order to perform the air purge, the thermal valve 32 that controls water flow to the heating terminal 8 is operated and opened. The thermal valve 28 built in the heating terminal 6 cannot be operated directly by the control unit 10 and cannot be opened. Therefore, the thermal valve 28 is operated by transmitting a thermal valve start signal, for example, an anti-freezing operation signal, to the heating terminal 6. Then, the thermal valve 28 is opened. The air purge can be regarded as an antifreezing operation without combustion. The low temperature control valve 30 is set to a position where the head can be gained (step S10).

  The rotational speed is fixed at a predetermined rotational speed, for example, 4800 rpm, the circulation pump 20 is driven, and air purge is started (step S11). The pump operation may be a continuous drive or an ON / OFF drive.

  It is determined whether there is another operation during the air purge (step S12).

  If there is another operation, the air purge is ended (step S16), the air purge interval timer is initialized (step S17), the process returns to step S1, and the next water collapse detection is performed after a predetermined time, that is, 240 hours later.

  If there is no other operation during the air purge in step S12, the air purge time is counted by the air purge timer (step S13). For example, the air purge time is set to 8 minutes, and steps S10 to S13 are repeated until 8 minutes have elapsed, and the air purge is continued. When the air purge timer times 8 minutes, the circulation pump 20 is stopped (step S14).

  The operation of the thermal valve 32 is terminated and the thermal valve 32 is closed. A thermal valve end signal, for example, a freeze prevention operation end signal is transmitted to the heating terminal 6, the thermal valve 28 of the heating terminal 6 is closed, the air purge is terminated (step S15), and the process proceeds to step S6.

  Next, the abnormality determination control will be described with reference to FIG. FIG. 5 is a flowchart showing abnormality determination control as an example of a control method of the heat exchange system.

  In step S21, it is determined whether or not the electrode UL50 detects an abnormal water level (UL = on). If not detected, there is no abnormality. If it has been detected, there is a possibility of an abnormality, so the processing after step S22 is performed. In order to prevent frequent air purges, for example, an air purge interval timer may be set to 240 hours, and detection may be performed every 240 hours.

  In step S22, it is determined whether or not all operations have been completed. If all the operations are not completed, the process returns to step S21. If all the operations have been completed, the process proceeds to step S23, and whether or not the temperature of the water W in the outlet channel of the open tank 18, that is, the temperature detected by the temperature sensor 22, is less than a predetermined temperature, for example, 40 ° C. Determine. If the detected temperature is lower than 40 ° C., the process proceeds to step S24 to perform an air purge in order to proceed to the abnormality determination operation. In the present embodiment, as in the case where the detected temperature is less than 40 ° C., the reason for performing the air purge when the temperature of the heat medium is lowered is that the heating terminal or the like that operates during the air purge makes the user uncomfortable. This is to avoid giving them.

  In step S24, air purge for removing air mixed in the circulation paths 12, 14, and 16 is started. The heat valves 28 and 32 and the low temperature control valve 30 corresponding to the connected heating terminals 6 and 8 are opened so that the heat medium flows.

  In step S25, the circulation pump 20 is driven. The pump operation may be a continuous drive or an ON / OFF drive. At this time, the burner 25 is not burned. In step S26, an air purge timer for measuring the air purge time is started.

  In step S27, it is determined whether there is another operation during the air purge. When an operation other than the air purge is started during the air purge, the process proceeds to step S34, the drive of the circulation pump 20 is stopped, the thermal valves 28, 32 and the low temperature control valve 30 are closed, and the air purge operation is stopped.

  In step S28, it is confirmed whether or not the air purge timer has passed a predetermined time, for example, 8 minutes. If eight minutes have not elapsed, the process returns to step S27. When 8 minutes have passed, the process proceeds to step S29.

  In step S29, the driving of the circulation pump 20 is stopped. In step S30, the thermal valves 28 and 32 and the low temperature control valve 30 are closed, and the air purge operation is terminated.

  In step S31, it is determined whether or not the electrode UL50 detects an abnormal water level (UL = on). If it is not detected at this time, the rise in the liquid level in the open tank 18 is not abnormal because it is considered that air is mixed into the circulation paths 12, 14, and 16, and the process returns to step S21. If the electrode UL50 detects an abnormal water level, there is a high possibility of a liquid leakage failure of the replenishing valve 38, and the process proceeds to step S32.

  In step S32, the occurrence of an abnormality is displayed as an abnormality display on the information presentation unit 67, or a warning sound is emitted to notify the user. For example, an indication that the supply valve 38 is out of order is displayed.

  In step S33, processing associated with the occurrence of an abnormality such as an equipment stop or recovery operation is performed as the abnormality processing, and the process returns to step S21.

  If a slight leak occurs in the replenishing valve 38 and the heating operation is frequently turned ON / OFF, there is a possibility that the abnormality determination of the liquid leak cannot be made. Therefore, abnormality determination may be performed based on the occurrence frequency of abnormal water level detection. If it is a normal state, the liquid level of the open tank 18 will fall gradually by the natural evaporation of the water W which is a heat medium. Therefore, when an abnormal water level is detected without water replenishment, when the detection signal is repeatedly obtained a certain number of times N, it may be determined that the liquid has leaked and the information presenting unit 67 may display an abnormality.

  In the above embodiment, the air purge method is exemplified for each terminal and all systems simultaneously, but the air purge may be performed by a combination thereof.

  In the above embodiment, the case where water is used as the heat medium is exemplified. However, a liquid such as an antifreeze liquid other than water may be used instead of water, and whether the liquid level is normal or abnormal due to the change in the liquid level. The present invention is not limited to using water as a heat medium.

  Moreover, in the said embodiment, although the single heating terminal (heating terminal 6 or 8) is comprised in one heating pipe line, while installing a header in one heating pipe line, it respond | corresponds to several heating terminals. It is good also as a structure which installs several thermal valve which performs and installs several heating terminal via each thermal valve.

  As described above, the most preferable embodiment of the present invention has been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the detailed description of the invention. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist of the present invention, and such modifications and changes are included in the scope of the present invention.

  The present invention is useful for detecting abnormalities such as liquid leakage of a replenishing valve, and particularly useful for preventing erroneous detection of abnormalities because it detects abnormalities by eliminating the effects of water collapse and volume expansion due to the heat of the heating medium. is there.

It is a figure which shows the outline | summary of the heating apparatus which concerns on embodiment of this invention. It is a block diagram which shows the outline | summary of a control part. It is a flowchart which shows the water collapse detection control of a heat exchange system. It is a flowchart which shows the air purge control of a heat exchange system. It is a flowchart which shows abnormality determination control of a heat exchange system.

Explanation of symbols

2 Heating device 4 Heat source 6, 8 Heating terminal (heat radiation load)
10 Control unit (control means)
18 Open tank 20 Circulating pump 22 Temperature sensor (temperature detection means)
24 heat exchanger 38 supply valve (supply means)
42 Water level sensor (Liquid level detection means)

Claims (5)

A heat exchange system that heats a liquid with a heat exchanger and circulates the liquid to a heat radiation load to dissipate heat,
A tank connected to a flow path for circulating the liquid and storing the liquid;
A liquid level detecting means for detecting the liquid level of the liquid in the tank;
A pump for circulating the liquid through the flow path to the heat exchanger and the heat radiation load;
Replenishment means for replenishing the liquid to the flow path or the tank;
The liquid level in the tank is maintained within a predetermined range by causing the replenishing unit to replenish the liquid according to the detected liquid level of the liquid level detecting unit, and the detected liquid level has reached an abnormal liquid level. Control means for generating an output indicating an abnormality when the detected liquid level after driving the pump and circulating the liquid in the flow path is an abnormal liquid level;
A heat exchange system characterized by comprising:   2. The heat exchange system according to claim 1, further comprising a temperature detection unit configured to detect a temperature of the liquid, wherein the control unit shifts to an abnormality determination operation when the detected temperature is equal to or lower than a predetermined temperature.   The heat exchange system according to claim 1, further comprising a display unit that displays an operation abnormality by the output of the control unit. A method for controlling a heat exchange system in which a liquid is heated by a heat exchanger, and the liquid is circulated to a heat radiation load to dissipate heat,
A process of storing the liquid to be circulated to the heat exchanger and the heat radiation load in a tank;
Processing for detecting the level of the liquid in the tank;
A process for forcibly circulating the liquid through the flow path to the heat exchanger and the heat radiation load;
Processing to replenish the liquid to the flow path or the tank;
When the liquid level in the tank is maintained within a predetermined range by replenishing the liquid according to the detection liquid level of the liquid level detection means, and the detected liquid level reaches an abnormal liquid level, A process of determining an abnormality when the detected liquid level after forcibly circulating the liquid in the flow path is an abnormal liquid level;
A method for controlling a heat exchange system, comprising:   5. The control method for a heat exchange system according to claim 4, wherein the process of determining that the abnormality is a process includes a process in which the liquid level in the tank refers to the occurrence frequency of the abnormal liquid level.

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