JPH0117008Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an operation control device when performing air conditioning and heating using multiple absorption type water chiller/heaters.
In detail, one chiller/heater uses a proportional control system, the other chillers/heaters use a two-position or three-position control system, and one unit uses a proportional control system for small load fluctuations. In response to large load fluctuations, other water cooler/hot water machines employing two-position or three-position control systems are configured to follow in sequence.

As shown in Fig. 1, the conventional operation control system for multiple absorption type water chillers/heaters is based on the temperature detected by the temperature detection end 01 attached to the chiller/hot water header and a plurality of preset temperatures. are compared with the comparator 02, and based on this comparison value, the
It sent ON and OFF signals to respond to changing loads. As a result, when the load fluctuates, the entire water chiller/heater repeatedly turns on and off, which shortens the durability of the equipment and reduces efficiency. Furthermore, if the width of the control temperature is set to be large in order to improve this drawback, fluctuations in the supply cold/hot water temperature become large, making it difficult to perform ideal heating and cooling. Therefore, recently, methods have been proposed in which multiple units are individually controlled on and off to follow each other, and the total number of units is controlled proportionally, but in the former case, there are still large fluctuations in cold and hot water temperature, and tracking is not possible. There are flaws in gender,
Moreover, in the latter case, the cost of the equipment is high, and in the case of a large-sized device, it is difficult to apply it to a small-sized device.

This invention is proposed in view of these points,
The purpose of this study is to develop a control device that has excellent followability and is effective when applied to the operation control of a small-sized absorption-type water chiller/heater for use in air-conditioning equipment.

The configuration of the present invention will be described in detail below.The gist of the configuration is that a proportional control valve is installed in the gas supply path, and a proportional control solution pump is installed in the solution circuit.
The return temperature is detected by a temperature detection element installed in the cold and hot water return pipe, the return temperature is compared with a set temperature, and a control signal is sent to the proportional control valve and the solution pump based on the comparison result. A main engine that is proportionally controlled and equipped with a regulator, and a slave engine that has a two-position or three-position control valve installed in the gas supply path and that is controlled in two or three positions by a signal from a temperature controller on the main engine side. A heating and cooling system is constructed by the following: When the load fluctuation is small, the main engine follows it while performing proportional control, and when the load fluctuation is large, the slave engine follows it.

FIG. 2 shows an embodiment of the present invention having the above-mentioned configuration, and 1 is a system in which a proportional control valve 3 is installed in the gas supply path 2 and a solution pump 5 is installed in the solution circuit 4, as shown in FIG. The return temperature is detected by a temperature detection element 7 installed in the water return pipe 6, the return temperature is compared with a set temperature, and a control signal is sent to the proportional control valve 3 and the solution pump 5 based on the comparison result. This is the main engine equipped with a temperature controller 8 that sends water.

9, 10, 11 are gas supply paths 12, 13, 14
3-position control valve (or 2-position control valve) respectively for
15, 16, and 17 are attached to the slave machine,
Each control valve 15, 16 of this slave machine 9, 10, 11,
17, a control signal is sent from the temperature regulator 8 under the following conditions.

First, the conditions under which the slave machines 9, 10, and 11 operate are when there is a load fluctuation that the main machine 1 cannot follow. That is, when the load exceeds the range that can be followed by the main machine 1, first the slave machine 9 is controlled to High or Low operation, and if the load cannot be followed even with this, the slave machine 10 is controlled in the same way, Following slave machine 11
and move on. The conditions for stopping each slave device 9, 10, 11 are also the same as above.

Next, the operation of the embodiment having the above configuration will be described in detail. First, let me explain about cooling.
Since the load is large at the time of startup, if the number of starting machines is set to four, all of the main machines 1 and slave machines 9, 10, and 11 start operating, and the fuel consumption is 100%. and,
After that, when the load becomes smaller and the temperature detected by the temperature detection element 7 becomes lower than the temperature set in advance by the temperature controller 8, a signal from the temperature controller 8 causes the solution pump 5 of the main engine 1 to reduce the amount of solution circulated. Become. At the same time, the proportional control valve 3 is throttled, reducing gas consumption. This allows the main engine 1 to follow load fluctuations. In addition, when the load increases, the temperature detection element 7 detects the cold water return temperature,
In contrast to the above, the temperature regulator 8 opens the proportional control valve 3 of the main engine 1 and increases the circulation rate of the solution pump 5.

If the load fluctuation is small, the main engine 1 will follow the above action, but if the load fluctuation exceeds the follow-up range of the main engine 1, the main engine 1 will be operated in the same way with the slave engine 9 in High or Low operation. , and thereafter, the slave machines 10 and 11 are sequentially operated under such conditions. Then, when the load reaches the stop condition for the slave machines 9, 10, and 11, each of them is stopped in sequence, and finally only the main machine 1 is operated, and when the stop condition for the main machine 1 is reached, the main machine 1 is finally stopped.

Next, when the load increases, if the temperature controller 8 determines that the capacity of the main engine 1 is insufficient, it issues an operation start command to the slave unit 11 or a signal to switch from Low to High operation, and if the capacity is still insufficient. In such a case, a similar signal is sent to the slave unit 10, and this is done sequentially to follow the increase in load.

As described above, the present invention is a device that performs heating and cooling using multiple absorption type water chillers/heaters, in which one of them adopts a proportional control method, and the other ones adopt a two-position or two-position control method. Since three-position control is performed, the following effects can be expected.

When the load fluctuation is small, it can be followed only by the main engine 1 that employs the proportional control method, so the water chiller/heater can be operated efficiently.

The combination of the main engine 1, which uses a proportional control system, and the slave engine, which uses a two-position or three-position control system, enables operation control over a very wide range, which stabilizes the temperature of cold and hot water, making it ideal for It can be used for heating and cooling.

Since we adopted a proportional control method only for main engine 1,
Heating and cooling during the intermediate period of heating and cooling can be performed economically and efficiently.

Since starting and stopping are not repeated during normal load fluctuations, there is no heat loss due to starting and stopping.

Since the proportional control system is installed on only one of the multiple units, the control device is inexpensive and can be applied to small-sized air-conditioning equipment.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of conventional operation control, FIG. 2 is an explanatory diagram of an operation control device according to the present invention, and FIG. 3 is an explanatory diagram of a main engine employing a proportional control method. 1... Main engine, 2... Gas supply path, 3... Proportional control valve, 4... Solution circuit, 5... Solution pump, 7...
...Temperature detection element, 8...Temperature regulator, 9, 10,
11...Slave machine.

Claims (1)

[Scope of claim for utility model registration] A proportional control valve is installed in the gas supply path, and a proportional control solution pump is installed in the solution circuit,
The return temperature is detected by a temperature detection element installed in the cold and hot water return pipe, the return temperature is compared with a set temperature, and a control signal is sent to the proportional control valve and the solution pump based on the comparison result. A main engine that is proportionally controlled and equipped with a regulator, and a slave engine that has a two-position or three-position control valve installed in the gas supply path and that is controlled two-position or three-position by a signal from the temperature controller on the main engine side. An operation control device for multiple absorption chiller/heater machines consisting of and.