JP2509655B2 - Multiple control heat storage type heat source device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multiple-unit control regenerative heat source device, and in particular, a multiple-unit control suitable for increasing the efficiency of partial load operation by a plurality of regenerative heat source devices. The present invention relates to a heat storage type heat source device.

[Prior art] In recent years, with the increase in power demand, there is a tendency for the difference in power load between daytime and nighttime to expand, and the development of a multiple-unit control system for heat storage heat source devices has been promoted as a measure for leveling power demand. ing.

Examples of conventional partial load operation using a plurality of heat-storage-type heat source devices include, for example, Shuichi Takada “Turbo-chiller”, Showa 51
The technology described in "Parallel operation with partial load", p.232-234, published by Japan Refrigeration Association on December 10, is known.

This technology is equipped with a thermostat in the pipe just before the cold and hot water returned from the load side is split into multiple heat source devices, and the number of heat source devices is adjusted so that the temperature of the temperature sensing part becomes a set value. It has come to control.

[Problems to be Solved by the Invention]

Although it is possible to control the number of heat storage type heat source devices in the above conventional technique, in the above conventional technique, in order to control the inlet temperature of the heat source device to be constant, the start and stop of the heat source device during partial load increases. There was a problem that the coefficient of performance (COP) decreased.

The present invention has been made to solve the above-mentioned problems of the conventional technology, and reduces the number of times of starting and stopping the heat source device during partial load operation and improves the coefficient of performance (COP). The purpose is to provide a device.

[Means for solving the problem]

In order to achieve the above object, the configuration of a multiple-unit control heat storage heat source device according to the present invention is a heat storage heat source device including a heat source device, a heat storage tank connected to the heat source device, and a means for controlling these. , In a plurality of control heat storage type heat source device connected to the load side piping system, in each heat storage tank of the plurality of heat storage type heat source device, a temperature switch with different operating temperature is provided, respectively A switch is used to control the start / stop of the plurality of heat storage type heat source devices.

In addition, the above-mentioned purpose is to install a temperature switch having a different operating temperature in each heat storage tank of the heat storage type heat source device installed in plural units, whereby the heat source device installed in each heat storage type heat source device is installed. It is achieved by controlling the start and stop of.

It should be noted that the temperature switch can be realized by using an operating temperature that can be set and changing the set value for each heat storage tank.

[Action]

The temperature switch provided in each heat storage tank of the multiple heat storage heat source devices is, for example, in the first heat storage heat source device, the heat source device is turned on at the heat storage tank temperature of 44 ° C and turned off at 46 ° C. In the second heat storage type heat source device, the ON and OFF set values are shifted so that the heat source device is turned on at the heat storage tank temperature of 42 ° C and turned off at 44 ° C.

At the end of heat storage, hot water of the same temperature of about 55 ℃ is stored in both heat storage tanks.

Further, when the air conditioning is started, the heat storage tank temperature is gradually decreased because the heat storage is consumed, but since the set temperature of the first heat storage heat source device is higher, the first heat source device is started first. become.

Here, when the load is small and the increase in the temperature of the heat storage tank of the first heat storage heat source device is higher than the rate of decrease in the temperature of the heat storage tank of the second heat storage heat source device, the heat source devices are started one by one. When the load is large and the rate of decrease of the temperature of the second heat storage tank is higher than the rate of increase of the temperature of the first heat storage tank, the two units are simultaneously operated, and as a result, the number of units is controlled. In addition, the start / stop of heat source equipment is controlled by the temperature of the heat storage tank, and the number of start / stop operations is reduced by providing a difference between the temperature at which the heat source equipment is turned on and the temperature at which it is turned off, thereby improving the coefficient of performance.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a system diagram of a heat storage type heat source device applied to one embodiment of the present invention, and FIG. 2 is a system diagram of a multiple unit control heat storage type heat source device according to one embodiment of the present invention.

The apparatus shown in FIG. 1 shows a one-unit system of the heat storage type heat source apparatus applied to this embodiment.

In FIG. 1, 1 is an air-cooled heat pump type chiller unit for heat source equipment, 2 is this chiller unit 1
And a heat storage tank 3 connected via a brine pipe 8 to a brine / water heat exchanger for exchanging heat between the brine in the brine pipe 8 and the water in the cold / hot water pipe 10 on the load side, 4 brine pumps, 5 and 6 Is a brine flow path switching valve, 7 is a cold / hot water three-way valve, 9 is a heat storage heat exchanger that is connected to the brine pipe 8 and is arranged in a serpentine shape in the heat storage tank 2, and 11 is a heat storage tank. 2 A temperature switch provided near the center of the inside.

Next, the operation of this heat storage type heat source device 1 unit will be described.

(1) Cooling heat storage operation In FIG. 1, the flow directions of brine and water are indicated by solid arrows.

During the cooling heat storage operation, the brine flow passage switching valve 5 of the brine pipe 8 is closed, the brine flow passage switching valve 6 is opened, and the brine cooled in the chiller unit 1 is circulated to the heat storage heat exchanger 9 in the heat storage tank 2. Heat is stored by icing around the heat storage heat exchanger 9. At this time, the flow of cold and warm water has stopped.

(2) Cooling / air-conditioning operation In FIG. 1, the flow directions of brine and water are indicated by alternate long and short dash lines.

During the cooling and air conditioning operation, the brine flow passage switching valve 5 of the brine pipe 8 is opened, the brine flow passage switching valve 6 is closed, and the three sides of the cold / hot water three-way valve are opened.

The brine cooled in the chiller unit 1 is sent to the brine / water heat exchanger 3, where it is returned from the load at 12 ° C.
The temperature of the cold / hot water is cooled to about 9 ° C. by exchanging heat with the cold / warm water, and the cold / hot water is supplied to the load such as an air conditioner through the hot / cold water pipe 10b. At this time, a part of the cold / hot water is sprayed and input to the heat storage tank 2 via the cold / hot water pipe 10a, and the three-way valve 7 is controlled so that the outlet of the cold / hot water three-way valve 7 of the cold / hot water pipe 10b becomes 7 ° C. To do.

(3) Heating heat storage operation In FIG. 1, the flow directions of brine and water are indicated by solid arrows.

During the heating heat storage operation, the brine flow path switching valve 5 of the brine pipe 8 is closed, the brine flow path switching valve 6 is opened, and the brine heated in the chiller unit 1 is circulated to the heat storage heat exchanger 9 in the heat storage tank 2. , Heat is stored by heating the water in the heat storage tank 2 to about 55 ° C. At this time, the flow of cold and warm water has stopped.

(4) Heating / air-conditioning operation In Fig. 1, the flow directions of brine and water are indicated by broken line arrows.

During the heating and air conditioning operation, the brine flow path switching valve 5 of the brine pipe 8 is closed, the brine flow path switching valve 6 is opened, and the two sides of the cold / hot water three-way valve 7, which are the storage tank 2 connection side and the load side, are opened.

A temperature switch 11 that turns on the contact at 43 ° C. and turns off the contact at 45 ° C. is attached near the center inside the heat storage tank 2, and the signal line is connected as shown by the broken line to form a control circuit.

The cold / hot water is not controlled by the cold / hot water three-way valve 7 and is all sent to the load via the heat storage tank 2.

In this way, the air-cooled heat pump chiller unit 1 does not start until the temperature of the heat storage tank 2 drops to 43 ° C,
When the temperature drops to 43 ℃ and starts immediately, the temperature of the heat storage tank 2 becomes 45
Continue continuous operation until the temperature reaches ℃.

For example, the chiller unit 1 of this embodiment has a heating capacity of 68.
When 700kcal / h and the water filling amount of the heat storage tank 2 is 9.72m ³ , the continuous operation time is Therefore, continuous operation is possible for at least 17 minutes, and the number of starts and stops can be significantly reduced.

As for the temperature switch, the larger the set temperature difference between ON and OFF, the longer the continuous operation time and the smaller the number of times of starting and stopping.

Next, the heating and air conditioning operation in the case of installing a plurality of units, which is the core of the present embodiment, will be described with reference to FIG.

In FIG. 2, reference numeral 12 denotes a first heat storage type heat source device, and 13
Is an air-cooled heat pump type chiller unit relating to a first heat source device, 14 is a first heat storage tank, 15 is a first brine / water heat exchanger, 16 is a first brine pipe, and 17 is a first 1
The first temperature switch provided in the heat storage tank 14 of FIG.

Further, 18 is a second heat storage type heat source device, 19 is an air-cooled heat pump type chiller unit relating to the second heat source device, 20
Is a second heat storage tank, 21 is a second brine / water heat exchanger, 22 is a second brine pipe, and 23 is a second heat storage tank 20.
It is a second temperature switch provided inside.

Further, 24 is a third heat storage type heat source device, 25 is an air-cooled heat pump type chiller unit relating to the third heat source device,
26 is a third heat storage tank, 27 is a third brine / water heat exchanger, 28 is a third brine pipe, 29 is a third heat storage tank 26
It is a third temperature switch provided inside.

30 is a hot / cold water pipe related to the load, for example, connected to an air conditioner, and the cold / hot water pipes 30-1, 30 are connected to the first, second, and third heat storage heat source devices.
-2,30-3 are branch connected.

The piping system configuration in each unit of the first, second, and third heat storage type heat source devices 12, 18, and 24 is the same as that of the unit shown in FIG.

The first, second and third temperature switches 17, 23 and 29 provided inside the first, second and third heat storage tanks 14, 20, and 26 are set under the following conditions.

1st temperature switch 17: 44 ℃… ON, 46 ℃… OFF, 2nd temperature switch 23: 42 ℃… ON, 44 ℃… OFF, 3rd temperature switch 29: 40 ℃… ON, 42 ℃… OFF, Next, the operation of the multiple unit control heat storage type heat source device of FIG. 2 during the heating and air conditioning operation will be described.

When the heat storage is completed, hot water of 55 ° C is stored in each of the heat storage tanks 14, 20, and 26.

When the air conditioning is started, the cold / hot water returned from the load via the cold / hot water piping 30 is returned to the three units by the cold / hot water piping 30-1,
The heat is divided through 30-2 and 30-3, and the temperature of each heat storage tank 14, 20, and 26 decreases.

Here, when the temperature of each heat storage tank 14, 20, 26 is lowered to 44 ° C., the chiller unit 13 of the first heat storage heat source device 12 is activated, and the temperature of the first heat storage tank 14 is increased.

At this time, if the load is large and the temperature lowering rate of the second heat storage tank 20 is higher than the temperature rising rate of the first heat storage tank, the temperature of the second heat storage tank 20 is increased during the operation of the first chiller unit 13. But
The temperature drops to 42 ° C and the second chiller unit 19 starts.

When the load is further heavy, the third heat storage tank 26 is lowered to 40 ° C. while the first and second chiller units 13 and 19 are operating, and the third chiller unit 25 is also activated.

The above description will be described quantitatively by taking as an example the case where the heating capacity is 68,700 kcal / H and the water filling amount in the heat storage tank is 9.72 m ³ .

(1) One air-cooled heat pump chiller unit operating When the load heat quantity is 103050 kcal / H, the load heat quantity that each unit 12, 18, 24 of the first to third heat storage heat source devices bears is 3435
It becomes 0 kcal / H.

In addition, the temperature of the first heat storage tank 14 drops to 44 ° C
When the chiller unit 13 is started up, the amount of heat input to the first heat storage tank 14 is 68,700 kcal / H, so the difference is 68700−34350 = 34350 kcal / H, and the heating rate of the first heat storage tank 14 is , Becomes

On the other hand, since the second and third heat storage tanks consume heat at 34350 kcal / H, the temperature lowering rate of the second and third heat storage tanks 20 and 26 is similarly 3.53 ° C./H.

Therefore, the rate of temperature rise of the first heat storage tank 14 is equal to the rate of temperature decrease of the second and third heat storage tanks 20 and 26, so if the load heat quantity is 103050 kcal / H or less, the air-cooled heat pump chiller unit is Only drive one at a time.

(2) Operation of two air-cooled heat pump chiller units When the load heat quantity is 137400 kcal / H, the load heat quantity that each unit 12, 18, 24 of the first to third heat storage heat source devices bears is 4580
It becomes 0 kcal / H.

In addition, the temperature of the first heat storage tank 14 drops to 44 ° C
When the chiller unit 13 is started up, the amount of heat input to the first heat storage tank 14 is also 68,700 kcal / H, so the difference is 68700−45800 = 22900 kcal / H, and the temperature rise of the first heat storage tank 14 Speed is Becomes

On the other hand, since the second and third heat storage tanks consume 45800 kcal / H of heat storage, the rate of temperature decrease is Becomes

Therefore, when the load heat quantity is 137400 kcal / H, the rate of temperature rise of the first heat storage tank × 2 becomes equal to the rate of temperature decrease of the second and third heat storage tanks 20 and 26. When the temperature of the first heat storage tank 14 reaches 45 ° C. due to the heating of the first chiller unit 13, the temperature of the second heat storage tank 20 reaches 42 ° C., and the operation of the second chiller unit 19 is started. When the temperature of the first heat storage tank 14 reaches 43 ° C., the temperature of the first heat storage tank 14 reaches 46 ° C. and the first chiller unit 13 stops, while the temperature of the third heat storage tank 26 becomes 40 ° C. and the third chiller unit 25 Will start.

Thus, when the heat load is 103050 kcal / H or more; 137400 kca
If it is less than 1 / H, two air-cooled heat pump chiller units will be operated.

(3) Operation of 3 units of air-cooled heat pump type chiller unit From the results of the above examination, 3 units of the air-cooled heat pump type chiller unit are operated simultaneously when the load heat amount is 137400 kcal / H or more.

As described above, according to the present embodiment, the start / stop of the chiller unit can be reduced to half or less of the conventional one, and the number of units can be controlled by a simple method, so that the coefficient of performance (COP) is improved by about 10% of the conventional one. can do.

In addition, although the above-mentioned embodiment explained the example of the device provided with three units of the heat storage type heat source device, the present invention is not limited to this, and three
It goes without saying that it can be applied to multiple units other than the unit.

Further, the heat source device has been described as an example of the air-cooled heat pump type chiller unit, but the present invention is not limited to the chiller unit, and other heat source devices can be adopted within a range in which the same effect is expected.

Furthermore, the present invention can also be used for control after exhaustion of heat storage in cooling air conditioning operation.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a multi-unit controlled heat storage type heat source device capable of reducing the number of times of starting and stopping the heat source device during partial load operation and improving the coefficient of performance (COP).

[Brief description of drawings]

FIG. 1 is a system diagram of a heat storage type heat source device applied to one embodiment of the present invention, and FIG. 2 is a system diagram of a multiple unit control heat storage type heat source device according to one embodiment of the present invention. 1 ... Chiller unit, 2 ... Heat storage tank, 3 ... Brine / water heat exchanger, 8 ... Brine piping, 9 ... Heat storage heat exchanger, 10 ... Cold / hot water piping, 11 ... Temperature switch, 12 ......
1st heat storage type heat source device, 13 ... 1st chiller unit,
14 ... First heat storage tank, 17 ... First temperature switch, 18 ...
… Second heat storage type heat source device, 19 …… Second chiller unit, 20 …… Second heat storage tank, 23 …… Second temperature switch,
24 …… Third heat storage type heat source device, 25 …… Third chiller unit, 26 …… Third heat storage tank, 29 …… Third temperature switch, 30,30-1,30-2,30-3 ...... Cold and hot water piping.

Claims (1)

(57) [Claims] 1. A plurality of heat storage type heat storage devices comprising a heat source device, a heat storage tank connected to the heat source device, and a means for controlling the heat storage device, wherein a plurality of heat storage type heat source devices are connected to a load side piping system. In the heat source device, temperature switches having different operating temperatures are provided in the heat storage tanks of the plurality of heat storage type heat source devices, and the start and stop of the plurality of heat storage type heat source devices are controlled by these temperature switches. A multi-unit controlled regenerative heat source device having the above structure.