JP4363611B2 - Solution concentration management method and solution circulation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for managing the concentration of a solution such as an antifreeze and a solution circulation device using the method, and more particularly, a hot water heating system that heats a heated heat medium, for example, a solution such as an antifreeze by circulation. The present invention also relates to a solution concentration management method and a solution circulation device suitable for an exhaust heat recovery system that recovers exhaust heat by circulating a solution heated by exhaust heat from a heat source such as a gas engine.
[0002]
[Prior art]
As a conventional exhaust heat recovery system, for example, by cooling a gas engine having a power generation function or circulating a heat medium heated by the exhaust gas through a circulation circuit provided with a heat exchanger, the heat exchanger passes through the heat exchanger. There is a system that recovers exhaust heat from gas engines.
[0003]
[Problems to be solved by the invention]
In such exhaust heat recovery of the gas engine, the antifreeze that cools the gas engine is circulated as a heat medium to recover the exhaust heat. Since the amount decreases, the amount of liquid is kept within a certain range by supplementing water. However, if water replenishment is repeated, the concentration of the antifreeze liquid decreases, and there is a problem that the circuit freezes or the piping of the circulation circuit and the gas engine rust.
[0004]
The present invention has been made in view of the above points, and an object of the present invention is to prevent the occurrence of problems due to a decrease in concentration by allowing the concentration of a solution such as an antifreeze solution to be controlled to a predetermined concentration or more. And
[0005]
[Means for Solving the Problems]
The present invention is configured as follows in order to achieve the above-described object.
[0006]
That is, the solution concentration management method of the present invention according to claim 1 is the solution management method for replenishing the solvent and holding the solution amount when the amount of the solution decreases. Based on the volume, the required amount of solution and the minimum acceptable solution concentration, determine an acceptable number of solvent replenishments up to the minimum solution concentration, and when the number of solvent replenishments reaches the determined number of solvent replenishments, This is informed.
[0007]
According to the first aspect of the present invention, the allowable number of times of solvent replenishment until reaching the minimum solution concentration is obtained, and when this number is reached, a notification is given, so the concentration of the solution falls below the minimum allowable concentration. Can be prevented beforehand.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the solution circulates in a circulation circuit, and the required amount of the solution is a total capacity in the circuit of the circulation circuit.
[0009]
According to the second aspect of the present invention, it is possible to prevent a problem from occurring when the concentration of the solution circulating in the circulation circuit falls below the lowest allowable concentration.
[0010]
According to a third aspect of the present invention, in the second aspect of the present invention, the solution is an antifreeze liquid and the solvent is water.
[0011]
According to the third aspect of the present invention, it is possible to prevent the antifreeze liquid circulating in the circulation circuit from freezing below the lowest allowable concentration or generating rust.
[0012]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the circulation circuit is provided with a water replenishing tank that is replenished with water as a solvent. A liquid level detecting device for detecting a low liquid level is provided, and the amount of water corresponding to the difference between the high and low liquid levels is set as the one-time solvent replenishment amount.
[0013]
According to the fourth aspect of the present invention, it is possible to detect a decrease in the amount of the antifreeze liquid based on the detection output of the liquid level detection electrode provided in the water replenishing tank, and to perform a predetermined amount of water replenishment.
[0014]
According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, when the test operation is performed with a solution in the circulation circuit, the number of times of solvent replenishment is reset.
[0015]
According to the present invention of claim 5, when solvent replenishment is repeated and the obtained number of times of replenishment is reached, notification is made, and when a test run is performed with a new initial concentration of solution in the circulation circuit, The number of times of replenishment of the solvent is reset, and the number of times of solvent replenishment is newly counted.
[0016]
According to a sixth aspect of the present invention, there is provided a solution circulation apparatus according to the present invention, wherein a circulation circuit for circulating a solution, detection means for detecting a decrease in the amount of the solution, and replenishing a solvent based on a detection output of the detection means. Solvent replenishing means for holding the amount of solution, the initial solution concentration, the amount of solvent replenishment performed once by the solvent replenishing means, the total capacity in the circuit of the circulation circuit, and the lowest acceptable solution concentration. Means for obtaining an allowable number of times of solvent replenishment until reaching the concentration, and notifying means for notifying when the number of times of solvent replenishment by the solvent replenishment means reaches the obtained number of times of solvent replenishment.
[0017]
According to the sixth aspect of the present invention, when a decrease in the amount of the solution is detected by the detecting means, the solvent is replenished by the solvent replenishing means, and the number of times that the solvent is replenished is allowed to reach the lowest solution concentration. When the number of times of solvent replenishment is reached, it is notified by the notification means, so that it is possible to prevent a problem from occurring when the concentration of the solution falls below the lowest allowable concentration.
[0018]
According to a seventh aspect of the present invention, in the sixth aspect of the invention, the solution is an antifreeze liquid, the solvent is water, and the circulation circuit is provided with a water replenishment tank that is replenished with water. The detection means includes a liquid level detection device that is disposed in the replenishment tank and detects a high liquid level and a low liquid level of the antifreeze liquid in the replenishment tank, and the solvent replenishment means includes the low liquid level of the replenishment tank. When the liquid level of the antifreeze becomes lower than that, the amount of water corresponding to the difference in level between the high and low is replenished as a single replenishment amount.
[0019]
According to the seventh aspect of the present invention, it is possible to detect a decrease in the amount of the antifreeze liquid based on the detection output of the liquid level detection electrode provided in the water replenishing tank, and to perform a predetermined amount of water replenishment.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of the present invention will be described based on embodiments shown in the drawings.
[0021]
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of an automatic bath system including a solution circulation device according to one embodiment of the present invention.
[0022]
The automatic bath system supplies electricity generated by the gas engine 1 having a power generation function to a household load of a general household where the automatic bath system is installed, while recovering exhaust heat from the gas engine 1. This is a gas engine cogeneration system that supplies hot water.
[0023]
In the figure, reference numeral 2 denotes an exhaust heat recovery circuit in which exhaust heat from the gas engine 1, for example, water cooling of the gas engine and an antifreeze as a heat medium heated by the exhaust gas of the gas engine circulate, Is provided with a first heat exchanger 4 and a circulation pump 5, and a water replenishing tank 40 that is replenished with water as a solvent as will be described later when the amount of antifreeze is reduced. ing.
[0024]
A water supply pipe 7 from the auxiliary heat source 6 is connected to the lower water supply port of the hot water tank 3, while a hot water discharge pipe 8 is connected to the upper hot water outlet. The hot water from the hot water storage tank 3 is mixed with the hot water supply, and hot water is supplied via the hot water supply heat exchanger 10. The water supply pipe 7 to the hot water tank 3 is branched and connected to the water supply port of the water supply tank 40 via the water supply valve 41.
[0025]
In this automatic bath system, the gas engine 1 is driven and the circulation pump 5 of the exhaust heat recovery circuit 2 is driven to remove the antifreeze from the gas engine 1 through the first heat exchanger 4 as indicated by an arrow. The exhaust heat recovered from the gas engine 1 is radiated by the first heat exchanger 4 to heat the low-temperature water in the hot water tank 3 to store heat, and is stored in the hot water tank 3. The hot water is supplied to the auxiliary heat source device 6 via the hot water supply pipe 8 and supplied with hot water as needed, while being supplied from the water supply pipe 7 to the hot water storage tank 3.
[0026]
As described above, the exhaust heat recovery circuit 2 circulates the antifreeze liquid as a heat medium to recover the exhaust heat of the gas engine 1. Therefore, in order to replenish water as a solvent and maintain the amount of antifreeze solution, replenishment of water to the replenishment tank 40 is performed. However, if replenishment is repeated, the concentration of the antifreeze will decrease and freeze. Or the piping of the exhaust heat recovery circuit 2 and the gas engine 1 are rusted.
[0027]
Therefore, in this embodiment, the concentration of the antifreeze liquid is managed to prevent the occurrence of problems such as freezing due to the decrease in concentration as follows.
[0028]
That is, in this embodiment, as shown in FIG. 2, the replenishment tank 40 is provided with a liquid level detection device that detects the liquid level of the antifreeze liquid. The liquid level detection device is a first liquid level detection electrode 42a that is suspended in the refill tank 40 and detects the high liquid level H of the antifreeze liquid 43, and a second liquid level detection electrode that detects the low liquid level L of the antifreeze liquid 43. 42b, and the outputs of these liquid level detection electrodes 42a and 42b are given to the controller 19 in the auxiliary heat source 6 of FIG.
[0029]
The controller 19 controls each part and manages the concentration of the antifreeze liquid. The liquid level of the antifreeze liquid in the replenishment tank 40 is detected by the second liquid level detection electrode 42b as the amount of the antifreeze liquid decreases. When the liquid level is lower than the low liquid level L, the water supply valve 41 is opened to supply water until the antifreeze liquid can be detected by the first liquid level electrode 42a that detects the high liquid level H, that is, automatic water replenishment is performed. This one-time automatic water replenishment amount is determined by the first and second liquid level detection electrodes 42a. The amount corresponds to the difference in liquid level between high and low H and L detected at 42b.
[0030]
In this embodiment, the controller 19 is based on the initial antifreeze concentration at which concentration management is started, one automatic water replenishment amount, the total capacity of the exhaust heat recovery circuit 2 through which the antifreeze solution circulates, and the lowest allowable antifreeze concentration. Thus, the allowable number of replenishment N up to the lowest antifreeze concentration is obtained, and when the number of automatic water replenishment reaches the obtained allowable number of replenishment N, the display portion of the remote controller 18 of the auxiliary heat source device 6 has no more than this. Replenishment is not possible, and a notification that the antifreeze should be replaced is displayed.
[0031]
Here, how to determine the allowable number N of refilling water will be described.
[0032]
If the initial concentration of antifreeze is Xs (%), the minimum concentration of nonfreezing antifreeze is Xm (%), the amount of automatic water replenishment at one time is K (liter), and the total capacity in the circuit is L (liter), the minimum concentration is reached. The number of times of water refilling n can be obtained by the following equation using a series.
[0033]
Xm / Xs> {(LK) / L} ^n-1
In this embodiment, the replenishment frequency N that can be allowed with a margin is set to n> N with respect to the obtained replenishment frequency n.
[0034]
The initial concentration Xs of the antifreeze liquid for obtaining the replenishment frequency n, the minimum concentration Xm that does not freeze, the automatic water replenishment amount K for one time, and the total capacity L in the circuit are, for example, a water filling test operation with the antifreeze liquid stretched over the exhaust heat recovery circuit 2 After being performed, it is input from the remote controller 18 or is set in advance, and the controller 19 calculates the number of times of water replenishment n using them, and further obtains an allowable number of times of water refill N.
[0035]
After the trial operation is completed, the controller 19 counts the number of times when automatic water replenishment is performed, and when the number of times reaches the allowable number of water replenishment N, the antifreeze solution should be replaced on the display unit of the remote controller 18, for example, , “Not refillable, antifreeze replacement required” is displayed and notified. In addition, you may alert | report with an audio | voice, a buzzer, etc. Further, the number of times of water replenishment may be displayed on the display unit of the remote controller 18.
[0036]
FIG. 3 is a flowchart showing the above-described automatic rehydration operation.
[0037]
First, it is determined whether or not the liquid level detection by the liquid level detection electrodes 42a and 42b is normal (step n1), and the first liquid level detection electrode 42a that detects the high liquid level H in the refill water tank 40 is turned on. Although the second liquid level detection electrode 42b for detecting the low liquid level L is turned off (no antifreeze liquid is detected) in spite of being detected (antifreeze liquid is detected), it is determined to be abnormal. Then, an error display of electrode abnormality is performed (step n10).
[0038]
When it is determined in step n1 that it is normal, that is, when the first liquid level detection electrode 42a is on and the second liquid level detection electrode 42b is other than off, the process proceeds to step n2 and the low liquid level L is set. It is determined whether or not the second liquid level detection electrode 42b to be detected is off. If not, the liquid level of the antifreeze liquid is higher than the low liquid level L detected by the second liquid level detection electrode 42b. Return to step n1.
[0039]
In step n2, when the second liquid level detection electrode 42b is off, the liquid level of the antifreeze liquid is lower than the low water level L detected by the second liquid level detection electrode 42b, and the liquid amount is reduced. It is determined whether or not the gas engine 1 is in operation (step n3). When the gas engine 1 is in operation, the operation is stopped (step n4). For example, whether or not 64 hours have passed since the previous automatic water replenishment. (Step n5), if it has not elapsed, the automatic water replenishment count M within 64 hours is incremented (Step n11), and it is determined whether or not the automatic water replenishment frequency M has become 2 or more (Step n12). ) When the number becomes 2 or more, an error indication of a small amount of antifreeze liquid is displayed on the assumption that a small amount of antifreeze liquid has leaked and two or more automatic water replenishments are required within 64 hours (step n1). ).
[0040]
In step n5, when 64 hours have passed since the last automatic water replenishment, or in step n12, when the number of automatic water replenishment M is not 2 or more, the process proceeds to step n6, where the number of automatic water replenishment is equal to or less than the allowable water replenishment number N described above. If the number of times of water replenishment is not less than the allowable number N, the concentration of the antifreeze liquid is lowered and the water cannot be replenished, and an error display indicating that the antifreeze liquid should be replaced is displayed and notified (step n14).
[0041]
In step n6, when the number of times of automatic water replenishment is equal to or less than the allowable number of water replenishment N, the water replenishing valve 41 is opened to start water replenishment from the water supply pipe 7 (step n7), and the high liquid level H in the water replenishing tank 40 is detected. It is determined whether or not the first liquid level detection electrode 42a has been turned on, that is, whether or not water has been replenished up to the high liquid level H (step n8). When water has been refilled, the water refill valve 41 is closed and the process returns to step n1. (Step n9). In step n8, if the first liquid level detection electrode 42a does not turn on even after two minutes have passed, it is determined that a large amount of antifreeze has leaked, the refill valve 41 is closed (step n15), and an error indication of a large amount of antifreeze leak is displayed. Is performed (step n16).
[0042]
When the automatic rehydration is repeated as described above and the concentration of the antifreeze liquid decreases and no more rehydration is allowed, an error message is displayed on the display unit of the remote controller 18, so that the user who sees it will A serviceman will be called to replace the antifreeze.
[0043]
As a result, it is possible to prevent in advance that the concentration of the antifreeze liquid is excessively reduced and the exhaust heat recovery circuit 2 is frozen or the gas engine 1 is rusted. Moreover, since there is no risk of freezing, there is no need to perform a freeze prevention operation.
[0044]
In addition, when the antifreezing liquid of the exhaust heat recovery circuit 2 is replaced and a test operation is performed, the controller 19 resets the number of automatic water refills so far, and newly counts the number of times of automatic water replenishment by performing a reset operation from the remote controller 18. To do.
[0045]
In areas where it is not necessary to use antifreeze, the use or nonuse of antifreeze can be selected with a dip switch, etc. The restriction may not be performed.
[0046]
Next, the exhaust heat recovery in this embodiment will be described in detail.
[0047]
Conventionally, the low temperature water in the hot water storage tank 3 is heated by the exhaust heat recovered from a heat source such as a gas engine and once stored, and then poured into the bathtub 11. Otherwise, there was a problem that the hot water could not be poured.
[0048]
Therefore, in this embodiment, the antifreeze heated by the exhaust heat of the gas engine 1 is downstream of the gas engine 1 of the exhaust heat recovery circuit 2 for returning the antifreeze liquid from the gas engine 1 to the gas engine 1, and the first A second heat exchanger 12 that enables heat supply to other than the hot water tank 3 is provided upstream of the heat exchanger 4.
[0049]
The second heat exchanger 12 communicates with a circulation heating circuit 13 through which bath water that exchanges heat with the antifreeze liquid in the second heat exchanger 12 circulates. 6, a bath heat exchanger 14, a bath pump 15, and a bathtub 11 are connected to each other, and the circulation heating circuit 13 is connected to a hot water supply pipe 17 through a pouring electromagnetic valve 16.
[0050]
The auxiliary heat source device 6 controls the stop of the driving of the gas engine 1 in accordance with the output of various sensors such as a water level sensor (not shown) and the setting operation from the remote controller 18 that remotely controls the auxiliary heat source device 6. The above-described controller 19 for controlling each part is incorporated.
[0051]
In this embodiment, the hot water stored in the hot water tank 3 is not poured into the bathtub 11 as in the prior art, but is first heated by the hot water supply heat exchanger 10 from the hot water supply pipe 17 through the hot water solenoid valve 16. Without watering, the tub 11 is supplied with water. Next, while the water in the bathtub 11 is circulated by the bath pump 15 in the auxiliary heat source 6 as indicated by the arrows, the gas engine 1 is driven and the circulation pump 5 is driven to circulate the antifreeze liquid. Thus, the bath water is heated and reheated by heat exchange with the antifreeze liquid heated by the exhaust heat of the gas engine 1 in the second heat exchanger 12 to heat the bath water.
[0052]
In this way, the heat of the antifreeze heated by the exhaust heat of the gas engine 1 is used directly by the second heat exchanger 12 for the bathing or reheating without going through the hot water storage tank 3. Can be increased.
[0053]
In addition, conventionally, as described above, since the hot water pouring into the bath is performed after the hot water is once stored in the hot water storage tank 3, the hot water storage tank 3 has to be large enough to store the amount of heat required for pouring the bath. On the other hand, in this embodiment, since the hot water of the hot water tank 3 is not used for pouring the bath, it is not necessary to store the amount of heat required for pouring the bath in the hot water tank 3, for example, About 100 liters, the hot water tank 3 can be made small.
[0054]
(Embodiment 2)
FIG. 4 is a schematic configuration diagram of a hot water heating system including a solution circulation device according to another embodiment of the present invention, and parts corresponding to the above-described embodiments are denoted by the same reference numerals.
[0055]
In this embodiment as well, the electricity generated by the gas engine 1 having a power generation function is supplied to the household load of a general household where the hot water heating system is installed, as in the above embodiment, By circulating the antifreeze liquid from the gas engine 1 through the first heat exchanger 4 by the circulation pump 5 of the exhaust heat recovery circuit 2, the exhaust heat recovered from the gas engine 1 is recovered by the first heat exchanger 4. This is a gas engine cogeneration system that stores heat by dissipating heat to heat water in the hot water tank 3.
[0056]
As in the above-described embodiment, the exhaust heat recovery circuit 2 is provided with a supplementary water tank 40, and the outputs of the first and second liquid level detection electrodes disposed in the supplementary water tank 40 serve as an auxiliary heat source. It is given to the controller 19 ₁ of the vessel 6 _1. Controller 19 _first auxiliary heat source unit _61, when the liquid amount of antifreeze that circulates through the exhaust heat recovery circuit 2 is decreased to automatically refill the water replenishing tank 40 through the Homizuben 41, the automatic refill times, acceptable rehydration When the number of times N is reached, the display unit of the remote controller 18 displays that the water cannot be replenished and the antifreeze should be replaced, as in the above-described embodiment.
[0057]
In this embodiment, the second heat exchanger 12 provided in the exhaust heat recovery circuit 2, the circulation heating circuit 13 ₁ for heating antifreeze for heat exchange between antifreeze heat recovery circuit 2 is circulated It communicates, the circulation heating circuit 13 ₁ includes a heating heat exchanger 20 of the auxiliary heat source unit 6 in _1, and heating pump 21, and by connecting the heating terminal 22, such as a fan convector or floor heating, the circulation the heating circuit 13 _1, when the liquid amount of the heating antifreeze decreased, auxiliary water tank 45 to replenish the water through the Homizuben 44 is provided.
[0058]
Furthermore, the circulation heating circuit 13 _1, provided with a bypass passage 23 which bypasses the second heat exchanger 12, to the bypass path 23 is provided with a third heat exchanger 24 disposed in the hot water storage tank 3 . Further, a circulating heating circuit 13 ₁ of the flow path of the heating antifreeze, three-way valve 25 for switching to the second heat exchanger 12 side or the bypass path 23 side.
[0059]
Circulating heating circuit 13 to the _first auxiliary water tank 45, similar to the embodiment described above, first, second liquid level detecting electrode is arranged to detect the respective liquid level in the level of antifreeze in the water replenishing tank 45, respectively and, the output of liquid level sensing electrode is supplied to the controller 19 ₁ of the auxiliary heat source unit 6 _1.
[0060]
Automatic controller 19 ₁ of the auxiliary heat source unit _61, similarly to the embodiment described above, when the liquid amount of the heating antifreeze that circulates through the circulating heating circuit 13 ₁ is lowered, the auxiliary water tank 45 via the Homizuben 44 When water is replenished and the number of times of automatic water replenishment reaches an allowable number of water replenishment N, a display is displayed on the display unit of the remote controller 18 that water replenishment is not possible and the heating antifreeze should be replaced.
[0061]
Calculation of the allowable number N of refilling water is the same as in the above-described embodiment. The circuit in the total capacity of the above required for calculating the refill number L (liters) of the flow path of the heating antifreeze circulating heating circuit 13 _1, is switched to the second heat exchanger 12 side or the bypass path 23 side Even in this case, the capacity is set to be almost the same.
[0062]
In this way, when automatic water replenishment is repeated and the concentration of the antifreeze for heating decreases, and when no more water can be refilled, an error message indicating that is displayed on the display unit of the remote controller 18, so that the user who sees it will A service person will be called to replace the antifreeze for heating.
[0063]
This allows you frozen circulating heating circuit 13 ₁ is the concentration of the heating antifreeze drops, so that can prevent such or rust.
[0064]
Next, the exhaust heat recovery in this embodiment will be described in detail.
[0065]
The hot water storage tank 3, while the first thermistor 26 for detecting the temperature is installed, the circulation heating circuit 13 ₁ of the auxiliary heat source unit 6 in the _first and second thermistors 27 are provided.
[0066]
In this embodiment, when the gas engine 1 and the circulation pump 5 is driven, the controller 19 _first auxiliary heat source unit ₆₁ is a three-way valve 25, is connected to the second heat exchanger 12 side in this case, by driving the heating pump 21 of the auxiliary heat source unit 6 in ₁ is circulated as indicated hot water for heating by the solid line arrow marks, the first heat medium heated by the exhaust heat of the gas engine 1, the 2 Heating water is heated by the heat exchanger 12 and supplied to the heating terminal 22 for circulation.
[0067]
When the gas engine 1 and the circulation pump 5 are stopped, based on the detection output of the first thermistor 26, when the temperature of the hot water in the hot water storage tank 3 is a high temperature exceeding a predetermined temperature, the controller 19 ₁ The three-way valve 25 is switched to the bypass path 23 side.
[0068]
As a result, the hot water for heating is heated by exchanging heat with the high-temperature water in the hot water tank 3 by the third heat exchanger 24 in the hot water tank 3 and supplied to the heating terminal 22 as indicated by broken arrows. It is circulated and heating operation is performed.
[0069]
As described above, when the gas engine 1 is stopped and the exhaust heat of the gas engine 1 cannot be recovered and the hot water tank 3 is sufficiently stored, the heating hot water circulation path is switched to the bypass path 23 side. 3 Heating operation is performed by exchanging heat with the high-temperature water in the hot water tank 3 through the heat exchanger 24.
[0070]
Further, in the heat exchanger or heat exchange with the first heat medium of high temperature water in the hot water storage tank 3, if the heating hot water does not reach the predetermined temperature, i.e., it is detected by the second thermistor 27 of the auxiliary heat source unit 6 in ₁ When the heating temperature does not reach the predetermined temperature, the heating heat exchanger 20 is used together to heat the warm water for heating.
[0071]
(Other embodiments)
In the above-described embodiment, the present invention is applied to the antifreeze liquid. However, the present invention is not limited to the antifreeze liquid, and may be applied to the management of the concentration of other solutions whose performance is deteriorated due to the decrease in concentration. The present invention is not limited to the solution circulating in the circuit, and may be applied to the concentration management of the solution stored in a tank or the like.
[0072]
In the above-described embodiment, the detection electrode suspended in the water replenishing tank is used as the liquid level detection device for detecting the level of the antifreeze liquid in the water replenishing tank. A float switch having two contacts corresponding to the liquid level and the low liquid level may be used.
[0073]
【The invention's effect】
As described above, according to the present invention, the allowable number of replenishment of the solvent until reaching the minimum solution concentration is obtained, and when the number is reached, a notification is made, so that the concentration of the solution falls below the minimum allowable concentration. It is possible to prevent problems from occurring.
[0074]
In particular, it is possible to prevent the antifreeze circulating in the circulation circuit from freezing below the lowest allowable concentration or generating rust. Moreover, since there is no risk of freezing, there is no need to perform a freeze prevention operation.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an automatic bath system including a solution circulation device according to one embodiment of the present invention.
FIG. 2 is a view showing a water replenishment tank and a liquid level detection electrode in FIG. 1;
FIG. 3 is a flowchart of a water refill operation.
FIG. 4 is a schematic configuration diagram of a hot water heating system including a solution circulation device according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas engine 2 Waste heat recovery circuit 3 Hot water tank 5 Circulation pump 6, 6 ₁ Auxiliary heat source 11 Bath 22 Heating terminal 19, 19 ₁ Controller 23 Bypass path | route 40, 45 Supplementary water tank 42a 1st liquid level detection electrode 42b 2nd liquid Position detection electrodes 41, 44

Claims (7)

In the solution management method of replenishing the solvent and holding the solution amount when the solution amount decreases,
Based on the initial solution concentration, one solvent replenishment amount, the required amount of solution and the lowest acceptable solution concentration, determine the number of acceptable solvent replenishments to reach the lowest solution concentration;
A solution concentration management method that notifies when the number of times of solvent replenishment reaches the determined number of solvent replenishments. The solution concentration management method according to claim 1,
The solution circulates in a circulation circuit, and the required amount of the solution is a total capacity in the circuit of the circulation circuit. A solution concentration management method according to claim 2,
The solution concentration management method, wherein the solution is an antifreeze and the solvent is water. A solution concentration management method according to claim 3,
The circulation circuit is provided with a water replenishment tank that is replenished with water as a solvent, and a liquid level detection device that detects a high liquid level and a low liquid level of the antifreeze liquid is provided in the water replenishment tank. A solution concentration management method, wherein the amount of water corresponding to the liquid level difference is the amount of the solvent replenished once. The solution concentration management method according to any one of claims 2 to 4,
A solution concentration management method characterized by resetting the number of times the solvent has been replenished when a test operation is performed with a solution in the circulation circuit. A circulation circuit for circulating the solution;
Detecting means for detecting a decrease in the amount of the solution;
Based on the detection output of the detection means, solvent replenishment means for replenishing the solvent and maintaining the amount of solution;
Based on the initial solution concentration, the amount of solvent replenishment by the solvent replenishment means, the total capacity in the circuit of the circulation circuit and the minimum allowable solution concentration, the allowable number of solvent replenishment times to reach the minimum solution concentration A means of seeking
A solution circulating apparatus comprising: an informing means for informing when the number of times of solvent replenishment by the solvent replenishing means reaches the determined number of times of solvent replenishment. The solution circulating apparatus according to claim 6,
The solution is an antifreeze, the solvent is water, and the circulation circuit is provided with a water replenishment tank that is replenished with water.
The detection means includes a liquid level detection device that is disposed in the replenishment tank and detects a high liquid level and a low liquid level of the antifreeze liquid in the replenishment tank,
The solvent replenishing means replenishes the amount of water corresponding to the high and low liquid level difference as a single replenishment amount when the liquid level of the antifreeze liquid is lower than the low liquid level of the replenishment tank. A solution circulation device.

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