JP3154039B2 - Temperature control device and temperature control method for water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device and a temperature control method for a chiller / heater, and more particularly to an apparatus for a chiller / heater based on abnormal temperature and pressure of a heat medium which is heated by a heating means for generating heat. The present invention relates to a temperature control device and a temperature control method for a water heater and a water heater that protects the water and controls the cold and hot water.

[0002]

2. Description of the Related Art FIG. 8 is a system diagram of an absorption type chiller / heater according to the prior art. The absorption chiller / heater 2 has a high-temperature regenerator 1 having a heating source 14 for heating the dilute solution 32b during cooling.
5 and a separator 1 for separating the dilute solution 32a heated by the high temperature regenerator 15 into a refrigerant vapor 33a and an intermediate concentration solution 34a.
8, a high-temperature solution heat exchanger 19 for exchanging heat between the intermediate concentration solution 34a from the separator 18 and the dilute solution 32c flowing into the high-temperature regenerator 15, and a refrigerant vapor 3 guided from the separator 18.
3a heats the intermediate-concentration solution 34b so that the refrigerant vapor 33b
A low-temperature regenerator 20 that separates the refrigerant vapor into a concentrated solution 35a; and a condenser 21 that condenses the refrigerant vapors 33a and 33b from the low-temperature regenerator 20.

Further, the liquid refrigerant 3 concentrated by the condenser 21
1 is sprayed and evaporated to cool the cold and hot water 27. The solution heat exchanger 22 and the absorber 1 which sprays the concentrated solution 35b from the low-temperature solution heat exchanger 22 and absorbs the refrigerant vapor flowing from the evaporator 16 into a diluted solution 32d.
7 and a solution circulation pump 23 for pumping the dilute solution 32 d generated in the absorber 17 to the high temperature regenerator 15 via the low temperature solution heat exchanger 22 and the high temperature solution heat exchanger 19.

Reference numeral 26a denotes a cooling water heat exchanger for removing heat of absorption in the absorber 17, reference numeral 26b denotes a cooling water heat exchanger for removing heat of condensation in the condenser 21, and reference numeral 30 denotes It is an absorbing solution that is a heating medium. Heating source 1
The exhaust gas 36 generated in 4 is discharged from the chimney.

At the time of heating, the cooling / heating switching valve 25 is opened. Therefore, the high-temperature absorbing solution 30a from the separator 18 is
The cold / hot water 27 that enters the absorber 17 and the evaporator 16 and flows in from the cold / hot water inlet 28 is heated to become hot water and flows out from the cold / hot water outlet 29. The heat-exchanged dilute solution 32 d is pumped to the high-temperature regenerator 15 via the low-temperature solution heat exchanger 22 and the high-temperature solution heat exchanger 19 by the solution circulation pump 23.

In such an absorption type chiller / heater 2, when performing multi-position control of the combustion output of the heating source 14 based on the temperature of the chill / hot water 27, conventionally, for example, in a cooling operation, as shown in FIG. The combustion operation has been performed at the set temperature To such that the relationship between the chilled water temperature of the chilled water 27 as the chilled water 27 and the combustion output becomes rectangular or stepwise. If the temperature control of the chilled water in the cooling operation is taken as an example, the finally controlled chilled water temperature is as follows. Light cooling load and cold water temperature of 6 ℃
The combustion stops when the temperature falls below. Cold water temperature rises to 10
When the temperature reaches 0 ° C, the combustion output becomes 100%, and when the chilled water temperature reaches 6 ° C, the combustion is repeatedly stopped. As a result, the combustion is operated between 6 ° C and 10 ° C.

[0007]

However, in such an absorption type chiller / heater 2, when controlling the temperature of chilled / hot water, the operation of the combustion output depends on the temperature of the chilled / hot water outlet 29 in the case of proportional operation. In the PID operation, when the combustion is performed by multi-position operation at two positions (combustion stop, 100% combustion) or three positions (combustion stop, 50% combustion, 100% combustion) or more, the temperature having hysteresis as shown in FIG. It is common to take control by setting.

In this case, when the temperature and the pressure of the absorbing solution 30 of the high-temperature regenerator 15 are abnormally increased, as shown in FIG. , The operation of forcibly stopping the combustion and the operation of directly reducing the combustion output irrespective of the temperature of the cold / hot water outlet 29 have been taken.
In such conventional cold / hot water control, when the temperature of the absorbing solution 30 of the high temperature regenerator becomes high, the control at the temperature of the cold / hot water outlet 29 is stopped, which is good in terms of equipment protection. However, there was a problem in securing the temperature of cold and hot water.

SUMMARY OF THE INVENTION It is an object of the present invention to protect the equipment of a chiller / heater by preventing abnormal rises in temperature and pressure of a heat medium of the chiller / heater, and to control the temperature of a chiller / heater capable of controlling the temperature of the chiller and heater. It is to provide an apparatus and a temperature control method.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heating means for generating heat, a heated means for heating a heating medium in response to the heating of the heating means, and a heating medium utilizing the heating medium. A heating and cooling means for heating or cooling the cold and hot water by heating and cooling the hot and cold water, wherein the temperature control device of the cold and hot water machine for controlling the temperature of the cold and hot water by operating the heating means. Temperature detecting means for detecting the temperature of the heat medium of the means, and calculating a predetermined temperature correction amount of the cold and hot water corresponding to the detected temperature of the heat medium detected by the temperature detection means, and calculating the temperature correction amount. A control unit for calculating a new set temperature by adding to the preset set temperature of the cold / hot water, and transmitting an operation signal for operating the heating means based on the new set temperature.

Further, in the above invention, the temperature detecting means detects a temperature in the vicinity of the heat medium outlet side of the heated means.

[0012] In any one of the above inventions, the temperature control device of the chiller / heater is configured to heat the heating means for generating heat of combustion of fuel and an absorbing solution in which a refrigerant is dissolved in an absorbent as the heating medium. It is provided in an absorption-type hot and cold water machine having the means to be heated and the heating and cooling means for heating or cooling cold and hot water using the absorbing solution.

Further, in a temperature control method for a chiller / heater in which a heating medium is heated by heating means for generating heat and chilled or heated water is heated or cooled by using the heating medium, the heating medium is heated by the heating means. Detecting the temperature of the heat medium, calculating a predetermined temperature correction amount of the cold / hot water corresponding to the detected temperature of the heat medium, and setting the temperature correction amount to a preset temperature of the cold / hot water To calculate a new set temperature, and control the temperature of the cold and hot water by operating the heating means based on the new set temperature.

[0014]

According to the temperature control device of the chiller / heater of the present invention, a temperature detector for detecting the temperature of the heat medium of the means to be heated, and a chilled / hot water predetermined in correspondence with the detected temperature of the heat medium. Calculate the temperature correction amount, add this temperature correction amount to the preset temperature of cold and hot water to calculate a new set temperature,
And a control unit for sending an operation signal for operating the heating means based on the new set temperature, so that when the temperature of the heat medium of the heated means rises, this temperature is detected, and By adding a predetermined temperature correction amount of the cold / hot water corresponding to the detected temperature to the preset temperature of the cold / hot water, and the temperature is controlled with the target of the new set temperature,
This is the same as substantially reducing the load of the water heater, and the amount of heat generated by the heating means can be reduced, thereby reducing the temperature of the heat medium of the heated means.
Therefore, the temperature and pressure of the heat medium of the chiller / heater can be prevented from abnormally rising to protect the chiller / heater, and the temperature of the chiller / heater can be controlled.

Further, in the above invention, the temperature detecting means detects the temperature in the vicinity of the outlet of the heating medium of the heated means. And the controllability and reliability of the temperature control device of the cold / hot water generator are improved.

In any one of the above inventions, the temperature control device of the chiller / heater is provided in the absorption chiller / heater. In this case, the temperature and pressure of the heat medium of the chiller / heater can be prevented from being abnormally increased, thereby protecting the chiller / heater and controlling the temperature of the chiller / heater.

Further, according to the temperature control method for a water heater of the present invention, the temperature of the heating medium heated by the heating means is detected, and a predetermined cooling temperature corresponding to the detected temperature of the heating medium is detected. The temperature correction amount of the water is calculated, the temperature correction amount is added to the preset temperature of the cold and hot water to calculate a new set temperature, and the heating means is operated based on the new set temperature to control the cold temperature. Since the temperature of the water is controlled, when the temperature of the heat medium rises, this temperature is detected, and the temperature correction amount of the predetermined cold / hot water corresponding to the detected temperature is set to the predetermined cold / hot temperature. Since the temperature is controlled with the target of a new higher set temperature added to the set temperature of water, the load on the chiller / heater is reduced substantially, and the amount of heat generated by the heating means can be reduced. This reduces the temperature of the heating medium. It can be. Therefore, it is possible to prevent abnormal rises in the temperature and pressure of the heat medium and to control the temperature of the cold and hot water.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a temperature control device and a temperature control method for a chiller / heater according to the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a system diagram of an absorption chiller / heater to which the temperature control device of the present embodiment is applied. The temperature control device 3 according to the present embodiment includes a heating source 14 that is a heating unit that generates combustion heat of fuel, and an absorption solution 30 in which a refrigerant is dissolved in an absorbent that is a heating medium by receiving heat from the heating source 14. It has a high-temperature regenerator 15 as heating means to be heated, and an evaporator 16 and an absorber 17 as heating and cooling means to heat or cool the cold / hot water 27 using the absorbing solution 30.

Further, the temperature control device 3 of the chiller / heater includes a regenerator temperature detector 4 as temperature detecting means for detecting a temperature near the outlet side of the absorbing solution 30 of the high temperature regenerator 15, and a regenerator temperature detector. Calculating a predetermined temperature correction amount H of the cold / hot water 27 corresponding to the detected temperature of the absorption solution 30 detected in 4;
The controller 6 adds the temperature correction amount H to a preset set temperature of the cold / hot water 27 to calculate a new set temperature, and sends an operation signal for operating the heating source 14 based on the new set temperature. It is provided with. The absorption chiller / heater 1 is the same as the absorption chiller / heater 2 shown in FIG. In FIG. 2, the same structure and operation as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 3 is a system diagram of the control unit 6 of the temperature control device 3 shown in FIG. The control unit 6 converts a temperature signal of the cold / hot water outlet 29 detected by the cold / hot water outlet temperature detector 13 and outputs the signal to the central processing unit 10.
Similarly, the temperature signal of the temperature 15a near the outlet side of the absorbing solution 30 of the high-temperature regenerator 15 is converted and the central processing unit 10
And a regenerator temperature detection circuit 11 for outputting to the regenerator.

Further, as indicated by broken lines, a power supply circuit 7 for supplying power for operating and controlling each circuit in the control section 6 and pressure, flow rate, etc. of various valves, vacuum pumps, solution circulation pumps, compressors and the like. And outputs the detected signal to the central processing unit 10, and conversely, receives the control signal from the central processing unit 10 and sends operation signals to the various valves, vacuum pumps, solution circulation pumps, compressors, etc. In response to a control signal from the input / output circuit 8 and the central processing unit 10, an operation signal 6a is sent to a combustion valve, a fan, and the like of the heating source 14, and a detection signal from a wind pressure switch, a safety device, and the like is converted and the central processing is performed. Processing unit 10
And a combustion control circuit 12 for output to

The operation of the temperature control device 3 of the water heater will be described with reference to FIGS. FIG.
1 is a control flowchart of an embodiment of a temperature control device for a water heater according to the present invention. First, a regenerator temperature detector 4 detects a temperature Tg of an absorption solution 30 of a high temperature regenerator 15. The combustion control circuit 12 converts the temperature signal of the temperature Tg of the absorption solution 30 detected by the regenerator temperature detector 4 and outputs the converted signal to the central processing unit 10. Upon receiving this conversion signal, the central processing unit 10 corrects the temperature of the cold / hot water outlet based on the predetermined relationship between the temperature of the absorbing solution of the high-temperature regenerator and the temperature correction amount H of the cold / hot water outlet, as shown in FIG. The quantity H is calculated.

Next, as shown in FIG. 7, the temperature correction amount H is added to a preset cold water temperature To which is a relationship between the cold water temperature, which is the cold water temperature, and the combustion output to newly set the cold water. Calculate the temperature Ts. The set temperature Ts of the new cold water is
In FIG. 7, a vertical dashed line is a dashed line obtained by moving the vertical solid line to the right by the correction amount H. According to the new set temperature Ts,
For example, the operation is such that the combustion of the heating source 14 is switched between 0% and 100% between 7 and 11 ° C. Here, if the load is large and the chilled water temperature rises, 11
When the temperature of the cold water drops to 7 ° C., the combustion switches to 0% combustion.

As shown in FIG. 4, the relationship between the absorption solution temperature Tg of the high-temperature regenerator 15 and the temperature correction amount H at the outlet of the cold / hot water is necessarily from approximately 140 ° C. It is not necessary to make the setting such that it becomes a downward straight line. For example, as shown in the relationship diagram of the absorption solution temperature Tg of the high-temperature regenerator and the temperature correction amount H at the cold / hot water outlet in FIG. It is also conceivable to change the curve with time.

Although the above embodiment has been described with respect to the case of cooling of the chiller / heater, in the case of hot water control during heating, not only two-position control but also multi-step control or three-position control or proportional ( In the control operation such as the P) operation, the integration (I) operation or the PID operation, similar control can be performed by correcting the set temperature itself.

Next, according to the temperature control method of the chiller / heater of the present embodiment, a heating source, which is a heating means for generating heat, heats an absorbing solution as a heat medium, and uses the absorbing solution to cool and cool the water. Heating or cooling, detecting the temperature of the absorbing solution heated by the heating source, and calculating a predetermined temperature correction amount of cold and hot water corresponding to the detected temperature of the detected absorbing solution. By adding this temperature correction amount to a preset set temperature of cold and hot water to calculate a new set temperature, and operating the heating source based on the new set temperature to control the temperature of the cold and hot water. is there.

Therefore, when the temperature of the absorbing solution rises, this temperature is detected, and a predetermined temperature correction amount of the cold / hot water corresponding to the detected temperature is added to the preset temperature of the cold / hot water. Then, since the temperature is controlled with the target of a new higher set temperature, the load on the water heater is substantially reduced, and the amount of heat generated by the heating source can be suppressed. Can be lowered. Accordingly, it is possible to prevent abnormal rises in the temperature and pressure of the absorbing solution and to control the temperature of the cold and hot water.

As described above, by automatically correcting the set temperature of the cold / hot water outlet by detecting the temperature of the absorbing solution of the high-temperature regenerator, the cold temperature close to the required temperature can be maintained while the protection function of the device is operated. Since the water outlet temperature can be controlled, it is possible to control the temperature of the cold / hot water outlet even in a situation close to an abnormal state of the temperature and pressure of the high-temperature regenerator.

[0030]

According to the temperature control apparatus for a water heater of the present invention, the correction amount is added to the set temperature of the water heater,
This substantially reduces the load on the chiller / heater, thereby preventing the temperature and pressure of the heating medium of the chiller / heater from being abnormally increased to protect the chiller / heater equipment and controlling the temperature of the chiller / heater. Will be possible.

Further, in the above invention, the temperature detecting means detects the temperature in the vicinity of the outlet of the heating medium of the heated means. An abnormality can be reliably detected, and the controllability and reliability of the temperature control device of the chiller / heater are improved.

In any one of the above inventions, the temperature control device for the chiller / heater is provided in the absorption chiller / heater. In this case, the temperature and pressure of the heat medium of the chiller / heater can be prevented from being abnormally increased, thereby protecting the chiller / heater and controlling the temperature of the chiller / heater.

According to the method of controlling the temperature of the water heater of the present invention, the load of cooling or heating of the water is substantially reduced by adding the correction amount to the set temperature of the water. Therefore, it is possible to prevent the temperature and pressure of the heat medium for cooling or heating the cold and hot water from being abnormally increased, and to control the temperature of the cold and hot water.

[Brief description of the drawings]

FIG. 1 is a control flowchart of an embodiment of a temperature control device for a water heater according to the present invention.

FIG. 2 is a system diagram of an absorption chiller / heater to which the temperature control device of the present embodiment is applied.

FIG. 3 is a system diagram of a control unit of the temperature control device shown in FIG. 2;

FIG. 4 is a relationship diagram between the temperature of the absorbing solution of the high-temperature regenerator and the temperature correction amount at the outlet of the cold / hot water in the present embodiment.

FIG. 5 is another relationship diagram between the absorption solution temperature of the high-temperature regenerator and the temperature correction amount of the cold / hot water outlet.

FIG. 6 is a diagram showing still another relationship between the temperature of the absorbing solution of the high-temperature regenerator and the temperature correction amount at the outlet of the cold / hot water.

FIG. 7 is a diagram showing the relationship between the chilled water temperature and the combustion output according to the present embodiment.

FIG. 8 is a system diagram of an absorption chiller / heater according to the related art.

9 is a diagram showing a relationship between a chilled water temperature and a combustion output of the absorption chiller / heater shown in FIG.

FIG. 10 is a diagram showing the relationship between the temperature of the absorbing solution and the combustion state of the high-temperature regenerator shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption chiller / heater (cooler / heater) 3 Temperature controller 4 Regenerator temperature detector (temperature detection means) 6 Control part 14 Heat source (heating means) 15 High temperature regenerator (heated means) 16 Evaporator (heating) Cooling means) 17 absorber (heating and cooling means) 27 cold and hot water 30 absorbing solution (heat medium)

Claims (4)

(57) [Claims] 1. A heating means for generating heat, a heated means for heating a heating medium by receiving heat from the heating means, and a heating and cooling means for heating or cooling cold and hot water using the heating medium. A chilled / hot water machine having a temperature control device for controlling the temperature of the chilled / hot water by operating the heating means, wherein a temperature detecting means for detecting a temperature of a heat medium of the heated means, Calculate a predetermined temperature correction amount of the cold / hot water corresponding to the detected temperature of the heat medium detected by the temperature detection means, and add the temperature correction amount to a preset temperature of the cold / hot water. A controller for calculating a new set temperature and sending an operation signal for operating the heating means based on the new set temperature. 2. The temperature control device for a water heater according to claim 1, wherein the temperature detecting means detects a temperature near an outlet side of the heating medium of the heating means. 3. The temperature control device of the chiller / heater according to claim 1, wherein the heating means for generating heat of combustion of the fuel and an absorbing solution in which a refrigerant is dissolved in an absorbent are heated as the heating medium. The temperature of the chilled / hot water machine characterized by being provided in an absorption type chilled / hot water machine having the heated means and the heating / cooling means for heating or cooling the chilled / hot water using the absorbing solution. Control device. 4. A method for controlling the temperature of a chiller / heater in which a heating medium is heated by heating means for generating heat, and the chilled or heated water is heated or cooled by using the heating medium. Detecting the temperature of the heat medium, calculating a predetermined temperature correction amount of the cold / hot water corresponding to the detected temperature of the heat medium, and setting the temperature correction amount to a preset temperature of the cold / hot water And calculating a new set temperature, and operating the heating means to control the temperature of the cold and hot water based on the new set temperature.