JPH0743186B2 - Control method for multiple heat source units - Google Patents

Description

TECHNICAL FIELD The present invention includes a first heat source device such as a heat pump equipped with a compressor having good thermal efficiency, and a second heat source device having low thermal efficiency, such as a boiler. The present invention relates to a method for controlling a plurality of heat source machines.

BACKGROUND ART When a temperature level and a load variation pattern are different such as heating and hot water supply, and water supply of a hot water pool, a heat-efficient peat pump equipped with a compressor is used to obtain hot water for heating, for example. Boilers, which have low thermal efficiency but inexpensive equipment, are used for hot water supply, hot water pool water supply, etc.

Problems to be Solved by the Invention In this prior art, although the capacity of the heat pump is designed to be able to respond to the maximum value of the heating load, the capacity of this heat pump and the heating load do not always match. In many cases, the heating load is much smaller than the capacity of the heat pump. In such a case, the capacity of the heat pump cannot be sufficiently drawn out, and thus it is desired that the heat pump share a part of the load such as hot water supply and water supply in the hot water pool.

At this time, if a part of the hot water from the heat pump is supplied to the load such as hot water supply or water supply in the hot water pool at a constant flow rate, the supply of hot water to the heating load may become insufficient.

An object of the present invention is to provide a first heat source device such as a heat pump using a compressor and a second heat source device such as a boiler having a lower thermal efficiency than the first heat source device, thereby providing the first and second heat source devices. It is an object of the present invention to provide a method for controlling a plurality of heat source units, which is designed to improve the thermal efficiency as a whole as much as possible when operating in response to individual loads.

Means for Solving the Problems The present invention includes a first heat source machine and a second heat source machine having a thermal efficiency lower than that of the first heat source machine, and applies fluid from the first heat source machine to a first load, The fluid from the two heat source units is applied to the second load, and the first heat source unit operates so that the temperature of the fluid of the first heat source unit reaches a predetermined first set value. The operation is performed so that the temperature of the fluid of the second heat source device becomes a predetermined second set value, the temperature of the fluid of the first heat source device becomes the first set value, and the first heat source device is A method of controlling a plurality of heat source units, wherein heat is transferred between the first heat source unit and the second load so that the load of the first heat source unit becomes large when the load is not a load.

Action According to the present invention, the first heat source device and the second heat source device individually correspond to the first load and the second load, respectively.
The heat source device operates so that the temperature of the fluid of the first heat source device reaches a predetermined first set value, and the second heat source device operates by the second temperature of the fluid of the second heat source device being predetermined. Operate to the set value. When the temperature of the fluid of the first heat source device is at the first set value and the first heat source device is not at full load, that is, when the capacity of the first heat source device has a margin,
The first heat source unit and the second heat source unit are arranged so that the load on the first heat source unit becomes large.
Transfers heat to and from the load. Therefore, the capacity of the first heat source machine can be sufficiently drawn out, and the thermal efficiency can be improved. When the second load is, for example, hot water supply, hot water pool water supply, or the like, hot water from the first heat source unit is supplied to the second load, and when the second load is a cooling load, the temperature suitable for cooling is low. Fluid is supplied to the second load.

Embodiment FIG. 1 is an overall block diagram of an embodiment of the present invention. First heat source device 1 including a heat pump using a compressor
A fluid such as water heated by is supplied from the conduit 2 to the first load 5 for heating via the header 3 and the conduit 4. The heated fluid from the first load 5 returns from the pipe 6 to the first heat source device 1 via the header 7 and further via the pipe 8, and thus the fluid is circulated. First heat source machine 1
Includes an internal combustion engine that drives a compressor. First heat source machine 1
The load output of corresponds to the rotation speed of the internal combustion engine.

The second heat source device 11 is, for example, a boiler, and has a lower thermal efficiency than the first heat source device 1. A fluid such as hot water from the second heat source device 11 is supplied from the pipe 12 to the second load 17 via the header 13, the pipe 14, the three-way valve 15 and the pipe 16. The second load 17 is, for example, hot water supply, water supply for a hot water pool, or the like. The fluid from the second load 17 flows from the conduit 18 to the header 19
And it returns to the 2nd heat source machine 11 via line 20, and fluid is circulated in this way.

The header 3 is connected to the three-way valve 15 via a line 21. Pipeline
18 is connected to the header 7 via line 22. Pipeline 8,20
The temperature detecting elements 23, 24 are provided in the
The temperature of the fluid on the inlet side of the heat source device 1 and the second heat source device 11 is detected.

FIG. 2 is a block diagram showing the electrical construction of the embodiment shown in FIG. Outputs from the temperature detecting elements 23 and 24 are processed by a processing circuit 25 realized by a microcomputer or the like.
Given to. The rotation speed of the internal combustion engine that drives the compressor from the first heat source machine 1 is detected by the rotation speed detection element 26, and its output is given to the processing circuit 25. Processing circuit 25
Is the temperature of the fluid detected by the temperature detecting element 23,
The rotation speed of the internal combustion engine is controlled so as to reach the first set value set by the first setting circuit 27. Also the processing circuit 25
Is the combustion of the burner provided in the boiler so that the temperature detected by the temperature detecting element 24 corresponding to the second heat source device 11 becomes the second set value set in the second setting circuit 29. Control the amount.

Referring to FIG. 3, the process moves from step n1 to step n2,
The first heat source device 1 and the second heat source device 11 are operated.
In step n3, it is determined whether the temperature detected by the temperature detecting element 23 is the first set value set in the first setting circuit 27, and if so, the process proceeds to step n4. At step n4, it is judged whether the first heat source device 1 is at full load. Whether the first heat source unit 1 is full load,
It can be determined whether or not the rotation speed by the rotation speed detection element 26 of the internal combustion engine that drives the compressor provided in the first heat source machine has reached the allowable upper limit value. When the first heat source device 1 is not at full load, the process proceeds to step n5, where the pipeline 21
A part of the fluid from the pipe 21 flows through the three-way valve 15 from the pipe 21 to the pipe 16
Flow to. At this time, the fluid flowing from the header 13 through the conduit 14 also flows from the three-way valve 15 into the conduit 16. In this way, the heat from the first heat source device 1 is supplied to the first load 5 and transferred to the second load 17. The flow rate of the fluid flowing from the pipe 21 to the pipe 16 in the three-way valve 15 is
It is controlled by the opening degree of. Therefore, the first heat source unit 1
Operates at or near full load. As a result, it is possible to improve the overall thermal efficiency in the state where both the first heat source device 1 and the second heat source device 11 are operating. The fluid from the second load 17 flows from the conduit 18 to the header 19
And is led to the Hedsah 7 from the conduit 22.

When it is determined in step n4 that the first heat source device 1 is at full load, the process proceeds to step n4 and the operation is continued as it is.

If it is determined in step n3 that the temperature detected by the temperature detecting element 23 has not reached the first set value set in the first setting circuit 27, the process proceeds to step n8.
It is determined whether the first heat source device 1 is at full load. When the first heat source device 1 is at full load, the fluid supplied from the header 3 to the three-way valve 15 via the conduit 21 is shut off. As a result, the first heat source device 1 supplies the fluid to the first load 5, and the temperature detected by the temperature detecting element 23 can reach the first set value.

When it is determined in step n8 that the first heat source unit 1 is not in full load, the process moves to step n10, an error message is displayed, and it is known that a failure has occurred.

The temperature detecting elements 23, 24 are the first heat source device 1 and the second heat source device 1
Although it is configured to detect the inlet side temperature of 1, the outlet side temperature may be detected by interposing the conduits 2 and 12 as another embodiment of the present invention. Although the second heat source device 11 is a boiler in the above-described embodiment, an absorption type cold / hot water machine may be used. The first load 5 and the second load 17 are
Although it is used for heating and hot water supply, water supply for a hot water pool, etc., it may be load for freezing and cooling as another embodiment of the present invention.

The operation shown in FIG. 3 is a basic operation, and in reality, a dynamic element is taken into consideration, and a time element is included in the determination portion.

Effect As described above, according to the present invention, the first heat source device and the second heat source device having a lower thermal efficiency are individually associated with the first load and the second load, respectively. When the temperature of the fluid has reached the first set value, and the first heat source device is not in the full load state and there is a margin, heat is transferred to the second load by the first heat source device. Yotsute first
The load on the heat source machine is increased. This makes it possible to improve the overall thermal efficiency. Further, such control does not interfere with the respective temperature control operations of the first and second heat source machines, and stable control can be performed in a wide temperature range.

[Brief description of drawings]

FIG. 1 is an overall block diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing the electrical construction of the embodiment shown in FIG. 1, and FIG. 3 is a flow chart for explaining the operation. Is. 1 …… First heat source machine, 2,4,6,8,12,14,16,18,20 …… Pipeline,
3,7,13,19 …… Hesda, 5 …… First load, 11 …… Second heat source machine, 15 …… Three-way valve, 17 …… Second load, 23,24 …… Temperature detection element, 25… … Processing circuit, 26 …… Rotation speed detection element, 27
...... First setting circuit 29 ...... Second setting circuit

Front page continuation (72) Inventor Hidekazu Nakajima 5-1, Hirano-cho, Higashi-ku, Osaka-shi, Osaka Within Osaka Osaka Gas Co., Ltd. (56) Reference JP-A 61-262544 (JP, A) JP-A 60-211269 (JP, A) Jitsuko Sho 63-14280 (JP, Y2)

Claims (1)

[Claims] 1. A first heat source machine, and a second heat source machine having a thermal efficiency lower than that of the first heat source machine, the fluid from the first heat source machine is applied to a first load, and the fluid from the second heat source machine is supplied. The first heat source device is operated so that the temperature of the fluid of the first heat source device reaches a predetermined first set value, and the second heat source device is operated by the second heat source device. When the temperature of the fluid of the first heat source device is at the first set value and the first heat source device is not at full load, the first heat source device is operated so that the temperature reaches the predetermined second set value. A method for controlling a plurality of heat source units, wherein heat is transferred between the first heat source unit and the second load so that the load on the unit is increased.