JP2950639B2 - Ice storage heat source device and water supply method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice regenerative heat source device and a water supply method therefor, and more particularly to a method for monitoring the amount of heat stored in a heat storage tank at a water level to effectively automate water supply. The present invention relates to an ice storage heat source device and a water supply method thereof.

[0002]

2. Description of the Related Art Conventionally, in an ice storage type heat source device, the amount of heat stored in a heat storage tank is continuously monitored, and operation and stop control of the chiller unit and determination of completion of heat storage are performed by a microcomputer or the like. As means for continuously monitoring the amount of heat stored in the heat storage tank of the ice heat storage type heat source device, for example, “cooling and heating by heat pump” NO. 24, Electric Power Air Conditioning Study Group 9
Although a method for directly measuring the thickness of ice has been proposed as described in P9 issued on March 24, it cannot be said that it has been put to practical use. At present, monitoring of the amount of stored heat depends on the water level difference method described in the above-mentioned literature. But,
When monitoring the amount of heat storage by this water level difference method, in a method of controlling the water supply only by the water level, as in a normal air conditioning system,
There were various problems and automation was difficult.

[0003]

In the above prior art, no consideration has been given to automation of water supply, and the following problems have been encountered. (1) When water is supplied to a predetermined position in a state where ice remains in the heat storage tank, for example, inside the microcomputer, the position of completion of water supply is reset as a heat storage reference position (heat storage amount 0). . For this reason, the ice remaining before the water supply becomes excessive icing, resulting in a decrease in heat storage efficiency and air conditioning efficiency.

(2) During the air-conditioning operation, when the water level in the heat storage tank falls to a predetermined level and automatic water supply is performed, the water level rises with this, and the microcomputer determines that the heat storage amount has increased, and the chiller unit Operation and stop control are not performed normally. That is, due to the rise in the water level, the operation and stop of the heat source equipment are not properly performed, and the heat storage is used up quickly, so that the load cannot be covered because the heat storage is used up quickly, or the predetermined amount of ice is not formed. Heat storage operation is completed.

(3) When the water level in the heat storage tank drops to a predetermined level during the heat storage operation and automatic water supply is performed, the water level rises due to this, and the microcomputer determines that the heat storage amount has increased, and the microcomputer determines that the heat storage amount has increased. The heat storage operation is completed despite the lack of ice.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to supply water in an ice storage air-conditioning system that manages the amount of heat storage according to the water level without impeding heat storage operation and air-conditioning operation. An ice storage type heat source device that can realize automatic water supply and realizes automatic water supply while preventing a malfunction due to water supply during heat storage operation, air conditioning operation, and a decrease in ice making efficiency and deicing efficiency due to excessive icing. It is to provide a water supply method.

[0007]

In order to achieve the above object, an ice storage type heat source device according to the present invention comprises a heat source device, a heat storage tank connected to the heat source device, and means for controlling these. Means for measuring the water level of a heat storage tank in an ice storage type heat source device that performs heat storage and cold storage by phase change,
A means for detecting the temperature in the heat storage tank, a means for setting a time at which water can be supplied, and a means for supplying water based on information of each of these means are provided.

Further, in order to achieve the above object, a water supply method for an ice storage type heat source device according to the present invention comprises a heat source device, a heat storage tank connected to the heat source device, and means for controlling these. In the water supply method for an ice storage type heat source device that performs heat storage and cold storage by phase change and monitors the amount of heat stored in the heat storage tank by water level, the water level in the heat storage tank detected by means for measuring the water level in the heat storage tank is water supply. The temperature in the heat storage tank detected by the means for detecting the temperature in the heat storage tank is lower than a set value, and the current time is a predetermined heat storage time zone, an air conditioning time zone. When it is neither of these, water is supplied based on the above information.

[0009]

According to the above technical means, the water level detector
In addition to detecting that the water level in the heat storage tank has dropped, it also detects the temperature of the heat storage tank when the water level has dropped, and determines whether or not ice remains in the heat storage tank. Water is supplied only when the ice is left, so there is no need to supply water with the ice remaining. Further, even if the above two conditions are satisfied, the water supply is controlled not to be performed during the heat storage operation or the air conditioning operation. Therefore, the water supply is performed during the air-conditioning period, and the heat source device does not operate properly due to the rise in the water level due to the water supply. Similarly, since the water supply is controlled not to be performed during the heat storage operation, the water storage during the heat storage operation does not prevent the heat storage operation from being properly performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a system diagram showing a configuration of a heat source device of an ice storage type air conditioning system according to an embodiment of the present invention. FIG. 2 is a diagram of a run / stop curve in the device of FIG.
Is a control circuit diagram of the automatic water supply method in the apparatus of FIG. 1, and FIG. 4 is an operation flowchart for explaining the automatic water supply method in the apparatus of FIG. In FIG. 1, 1 is a heat source device (for example, a refrigerator), 2 is a brine / water heat exchanger, and the brine / water heat exchanger 2 returns from the antifreeze liquid cooled by the heat source device 1 and the load during air-conditioning operation. Exchange heat with cold water. Reference numeral 3 denotes a heat storage tank connected to the heat source equipment 1, and reference numeral 4 denotes an ice making heat exchanger provided in the heat storage tank 3. The ice making heat exchanger 4 operates the heat source equipment 1 using, for example, nighttime electric power. The heat exchange is performed between the generated low-temperature brine and the water in the heat storage tank 3 to form ice in the heat storage tank 3.

5 is a chilled water pipe for guiding chilled water from a load;
Are water spray pipes for spraying cold water from the brine / water heat exchanger 2 in the heat storage tank 3, and 7 and 8 are control valves for controlling the amount of cold water flowing into the heat storage tank 3 to control the temperature of the cold water outlet. , 9 are temperature detectors for detecting the chilled water outlet temperature, 10
Is a temperature controller that outputs an open / close signal to the control valve 8 based on a signal from the temperature detector 9, and 11 is a brine pipe that connects the heat source device 1 to the brine / water heat exchanger 2 and the ice making heat exchanger 4. 12, 13, 14 and 15 are switching valves for switching the flow direction of the brine between the air-conditioning operation and the heat storage operation;
Is a water level detector for detecting the water level for estimating the amount of heat stored during the heat storage operation and the remaining amount of heat storage during the air conditioning operation; 17 is a conduit connected to the water level detector 16; 18 is a temperature detector;
Is a control panel for the device body.

Reference numeral 20 denotes a water level detector relating to means for detecting the water level in the heat storage tank 3, 21 denotes a temperature detector relating to means for detecting the temperature in the heat storage tank 3, and 22 denotes an automatic water supply having a built-in timer. The control panel 24 is a water supply valve for controlling water supply in accordance with a command from the automatic water supply control panel 22, and 25 is a water supply pipe, which constitute a main part of the present invention.

First, the general operation of the ice storage type heat source device will be described. The operation of the ice storage type heat source device in the ice storage air conditioning system includes a nighttime heat storage operation and a daytime air conditioning operation. In the nighttime heat storage operation, the heat source device 1 is operated, the brine in the brine pipe 11 is cooled to 0 ° C. or lower, and the heat in the heat storage tank 3 is changed to ice to perform heat storage. Normally, such a heat storage operation is performed during the nighttime discount period (2
2.00 to 8:00). In addition, in order to reduce the size of the heat source device 1, the heat storage operation can be performed in addition to the night discount time period. For the heat storage amount, the water level detector 16 constantly measures the water level difference from the reference position (the position of the heat storage amount 0), and when the water level difference reaches a predetermined value, it is determined that the heat storage is completed, and the heat storage operation is ended. .

Next, in the daytime cooling operation, the heat source equipment 1 (refrigerator) is operated to cool the brine to about 3 ° C. and guide the brine to the brine / water heat exchanger 2 through the pipe 11.
The temperature of the cold water is reduced by performing heat exchange with the cold water in the cold water pipe 5 returned from the load. In addition, brine /
The control valve 7 is controlled so that the chilled water that has exited the water heat exchanger 2 has a predetermined temperature (for example, 7 ° C.) at the outlet of the unit.
8 is controlled by a temperature detector 9 and a temperature controller 10.

In the operation / stop control of the heat source equipment 1, in order to use up the heat storage at night as much as possible, the difference in water level from the reference water level detected by the water level detector 16 is converted into a heat storage amount inside the microcomputer, as shown in FIG. It is controlled inside the microcomputer by the run / stop curve. Here, FIG. 2 shows a change in the amount of stored heat over time as a chiller start curve and a chiller stop curve, with the horizontal axis representing time and the vertical axis representing heat storage.
The above-described heat storage operation control and air-conditioning operation control are performed by the control panel 19.

Next, the operation of automatic water supply, which is a feature of the present invention, will be described with reference to FIGS. In FIG.
Is a temperature detector for detecting the temperature in the heat storage tank (this temperature detector is the same as the temperature detector 21 shown in FIG. 1), and 32 is
A temperature converter 33 for converting a signal from the temperature detector 21 into a voltage, sets a voltage corresponding to the heat storage completion temperature, and when the voltage exceeds the set voltage, a voltage between contacts 4 and 5 is closed. A sensor 34 is a timer for opening a contact in a heat storage time zone, a timer 35 is a contact for opening a contact in an air conditioning time zone, and 20 is a water level detector for detecting a water level in the heat storage tank (this water level detection). The water level switch 37 is the same as the water level detector 20 shown in FIG. 1), 37 is a water level switch connected to the water level detector 20, and this water level switch 37 sets the feed water level. Upon receiving a signal indicating that the water level has dropped to the water supply level, the switch between the 10th and 1st terminals is closed. 38 and 39 are auxiliary relays, and 24 is a water supply valve for controlling water supply (this water supply valve is the same as the water supply valve 24 shown in FIG. 1).

Next, the operation of the water supply control of the embodiment shown in FIGS. 1 and 3 will be described with reference to the flowchart of FIG.
In the following description, the numbers in parentheses indicate the step numbers in the flowchart of FIG. Is shown. The steps (particularly steps 51 to 53) in the flowchart of FIG.
The condition for performing automatic water supply is confirmed, and the step display is omitted for details of the operation of the control circuit during this period. During operation of the ice storage type heat source device (step 5
In step 0), when information indicating that the water level in the heat storage tank 3 has been lowered to the water supply setting position by the water level detector 20 (step 51) is sent to the water level switch 37, the contact between the water level switch 37 and the first to tenth points Closes. If the time at that time is neither the heat storage time zone nor the air conditioning time zone (step 52), the contacts of the timers 34 and 35 are closed.

Next, in order to avoid excessive icing due to water supply,
The temperature in the heat storage tank 3 is detected by the temperature detector 21, and if the water temperature is equal to or higher than a preset heat release completion temperature (step 5).
3), the contact between the No. 4 and No. 5 of the voltage sensor 33 is closed, the auxiliary relay 38 is excited, and the water supply valve 24
Is moved in the opening direction to supply water to the heat storage tank 3 (step 54). Thereafter, when the water level in the heat storage tank 3 is equal to or higher than the set position (step 55), or when the heat storage time or the air conditioning time is reached (step 56), the water supply is terminated (step 57). By performing the above control, it is possible to realize automation of water supply while appropriately performing the air-conditioning operation and the heat storage operation.

According to this embodiment, automatic water supply can be realized in the ice storage air-conditioning system in which the amount of heat storage is controlled by the water level without interfering with the heat storage operation and the air-conditioning operation. It is possible to prevent a malfunction due to the above and a decrease in ice making efficiency and defrosting efficiency due to excessive icing.

In the above embodiment, the timers 34, 3
5 is set so that the contacts are closed in the heat storage time zone and the air conditioning time zone, respectively, but the present invention is not limited to this.
For example, in order to prevent a transient malfunction at the start of heat storage and at the start of air conditioning, it goes without saying that the water supply may be set not to be performed several minutes before the heat storage time zone or several minutes before the start of air conditioning. No. Further, the timer 34 of the above embodiment,
Instead of 35, it is also possible to receive a heat storage operation signal and an air conditioning operation signal from the control panel 19 on the main body side on the automatic water supply control panel 22 side, and determine whether the heat storage operation or the air conditioning operation is being performed.

Further, when the control is performed without paying attention to the exhaustion of the heat storage during the air conditioning and without managing the remaining amount of the heat storage during the air conditioning operation, the timer 34 in FIG. 3 is removed (short-circuited) and used. Is also possible. In addition, in the present embodiment, the control panel 19 of the main body and the automatic water supply control panel 22 are separate panels, but the automatic water supply control panel 22 can be incorporated in the control panel 19 of the main body. Further, in this embodiment, the automatic water supply control is realized by the sequence circuit. However, the automatic water supply control can be realized by software by a system using a microcomputer.

[0022]

As described above in detail, according to the present invention, the water supply in the ice storage air-conditioning system for controlling the heat storage amount by the water level can be realized without any trouble in the heat storage operation and the air-conditioning operation. An object of the present invention is to provide an ice regenerative heat source device that realizes automation of water supply while preventing a malfunction due to water supply during a heat storage operation and an air-conditioning operation, and a decrease in ice making efficiency and defrosting efficiency due to excessive icing, and a water supply method therefor. it can.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a configuration of a heat source device of an ice storage type air conditioning system according to an embodiment of the present invention.

FIG. 2 is a diagram of a run / stop curve in the apparatus of FIG.

FIG. 3 is a control circuit diagram of an automatic water supply method in the apparatus of FIG.

FIG. 4 is an operation flowchart illustrating an automatic water supply method in the apparatus of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat source device 2 brine / water heat exchanger 3 heat storage tank 4 ice making heat exchanger 5 cold water pipe 11 brine pipe 16 water level detector 18 temperature detector 19 control panel 20 water level detector 21 temperature detector 22 automatic water supply control panel 24 water supply Valve 25 Water supply piping 34, 35 Timer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F24F 5/00 F25C 1/00

Claims (2)

(57) [Claims] 1. An ice storage type heat source device comprising a heat source device, a heat storage tank connected to the heat source device, and means for controlling the heat storage device and performing a heat storage and a cold storage by a phase change, and measures a water level of the heat storage tank. Means, a means for detecting the temperature in the heat storage tank, a means for setting a time at which water can be supplied, and a means for supplying water based on information of each of these means. apparatus. 2. An ice heat storage device comprising a heat source device, a heat storage tank connected to the heat source device, and means for controlling the heat source device, performing heat storage and cold storage by a phase change, and monitoring the amount of heat stored in the heat storage tank at a water level. In the water supply method of the thermal storage device, the water level in the heat storage tank detected by the means for measuring the water level of the heat storage tank is lowered to a water supply setting position, and the water storage in the heat storage tank is detected by the means for detecting the temperature in the heat storage tank. When the temperature is equal to or higher than the set value and the current time is not a preset heat storage time zone or air conditioning time zone, water is supplied based on the above-mentioned information. Water supply method for the heat source device.