JPS5888572A - Controller for absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device τ for an absorption refrigerator. In general, absorption refrigerators are usually operated by setting the load fluid take-off temperature ltv in accordance with the cooling load in midsummer or the heating load in midwinter, that is, based on the maximum period of external load. For this reason, in places such as special C2 hospitals where heating and cooling are performed all year round, absorption chillers are operated at their maximum capacity even during periods of low load, such as spring and autumn, resulting in overcooling or overwarming. The problem arises. Therefore, a method has conventionally been adopted to deal with such a partial load C2 by frequently starting and stopping the absorption refrigeration II by performing so-called 1-on-off control.

However, the conventional method of refusing absorption refrigeration causes frequent (2) stoppages of the absorption refrigeration equipment (2), which shortens the lifespan of equipment such as pumps, and consumes a large amount of power every time equipment such as pumps is started (2). Top C: The efficiency of the absorption chiller at startup is poor (it has the disadvantage of high running costs).

In view of this point, the present invention adopts a configuration in which the set temperature for taking out a load fluid such as chilled water [1' is changed according to the change in outside air humidity (= change), and the set temperature is used to control the start/stop of the reference C absorption refrigerator,
Dramatically reduces the frequency of starting and stopping the refrigerator, increasing the operating efficiency of the absorption refrigerator to 4! absorption refrigeration with low running costs
v Provide! This is the purpose. Hereinafter, the present invention will be described in detail based on Example G shown in the drawings.

Figure 111 is the invention! Control of four absorption chillers (in the explanatory diagram showing two practical examples, % (1) is the absorption chiller control device,
121. (2'+, (6,<zT is absorption refrigerator, (
3) is the load fluid circulation path of the cold/hot water ring, (4) is the heat converter on the indoor or other external load side, (5) is the header on the load fluid inlet side to the absorption chiller, and +61) is the load from the absorption chiller. The fluid outlet side pump (8) is the load fluid outlet side header (6): a load fluid temperature detection section such as a temperature sensor provided therein.

(9) is an outside temperature detection section such as an outside temperature sensor.

FIG. 2 is a block diagram showing an example of the circuit configuration of the control device (1), (111 is the temperature detection section (8), +
Input multiplexer % of signal from 91 (11+ is A/
The D converter, 0, has a built-in microprocessor unit, so-called CPU, and is a calculation unit that sets the load fluid extraction temperature [Y] from the absorption chiller according to the signal from the outside air temperature detection unit (9), and I is the OPUg. Built-in, the arithmetic unit 113
04 is a signal from the determination unit 03, which determines whether to start or stop the operation of the absorption chiller by comparing the load fluid removal warm setting signal from the load fluid detection unit (8) with the signal from the load fluid detection unit (8). The switch unit (19) is an output multiplexer that sends data to the switch unit (19); .

Next, the control operation Y in step 8 during cooling in the embodiment of the present invention will be explained.

B) When the outside air temperature is 30°C or higher When the outside air temperature is 30°C or higher, the signal from the outside air temperature detection section (9) is input to the multiplexer ■, A/D converter O
Operation 5Q2E via 1v: When input, the operation unit! ,
R, the absorption chiller (2), (2), (2), (2-chilled water take-out temperature is set and operated at 9℃, 8℃, 7℃, 6℃, respectively. (load fluid) temperature detection g
The signal from +81 is input to the determination unit Os via the λ multiplexer A/D converter Dv and is returned.For example, the external load decreases due to an increase in the number of rooms that do not require air conditioning, and the cold water temperature decreases to 9. .5°C to 8.5°C (:, then the judgment section <3 (=, g), and the cold water temperature is absorption freezing 11 (
Recognizing that the temperature has dropped below the set temperature for taking out the cold water of 2+, the determination unit aj outputs the
An operation stop command signal for the absorption chiller (2) is output to the C switch WaS. And switch 5115+11°
, the excitation of the relay (1r/) 1 fill is released from the output relay drive circuit α6i+2, the contact side is opened, and the operation of the absorption refrigerator (2) is stopped. On the other hand, since the temperature is lower than the other temperature It (8.5° C.), operation continues as it is.

Moan 1 If the outside temperature is less than 30°C Next C: If the outside temperature A falls below 30°C, the outside temperature! Decrease C: Accordingly, the calculation unit 021c sets the cold water take-out temperature (-) as described below. Here, the outside air temperature 30
Chilled water outlet set temperature IFt'yO (referred to as initial value) when the temperature is above ℃, outside temperature 1 t Decreasing temperature change t from 30 ℃
x, outside air temperature compensation coefficient - - 1 chilled water takeout set temperature #tt'y and g, the cold water takeout temperature is set by the relational expression yakiKx+yo-...-(1) . Incidentally, the outside air temperature compensation coefficient can be set as appropriate by operating the temperature resistor of the compensation circuit a.

For example, when K is α1 and the outside temperature is 25°C, the falling period value yo
If w remains the same as in case (a) above, 9°C, 8”C, 7°C, 6°C, the absorption cooling will be 5°C, 8.5°C according to relational formula [1].
℃, 7.5℃% 6.5℃.

In other words, 1. In the present invention, when the cooling load is reduced due to the influence of a drop in outside air temperature, such as at night during the middle of spring or autumn, the cold water extraction temperature fft' is set higher in response to the drop in outside air temperature. What to do C: From this, the amount of cooling heat supplied from the absorption refrigerator to the A part load side is suppressed, or in other words, the refrigeration capacity is suppressed in advance to prevent the factory from becoming too cold. Therefore, the cooling load decreases as the outside air temperature decreases.
There is no need to start and stop.

Therefore, the present invention can prevent the reduction in operating efficiency caused by frequent starting and stopping of the absorption chiller, and can also save energy costs for driving the chiller. When the cooling load decreases, for example, the number of parts that do not function increases, etc., the temperature of the cold water flowing through the cold water (load fluid) circulation path (3) decreases. , if the temperature is lower than the set temperature for taking out the cold water, similarly to A] above,
Signal C: Therefore, the operation of the absorption refrigerator is stopped. or,
When the cooling load increases again and the chilled water temperature rises to reach the chilled water extraction set temperature, the absorption refrigerator is restarted.

In addition, during heating (28), this is done by taking out hot water (load fluid). Here, (2'M, %y is the set temperature for hot water taking out, K is the outside air temperature compensation coefficient, and X is the hot water taking out when the outside air is below ゛C). The set temperature C is the initial value).

Therefore, the hot water temperature detected by the determination unit 0: ICg is compared with the corresponding hot water takeoff set temperature and the hot water temperature detected by the hot water (11 load fluid) temperature detection unit 18), and the hot water temperature is determined to be the hot water temperature. When the temperature becomes higher than the set temperature for taking out, the operation of the absorption refrigerator is stopped, and when the hot water temperature of 11 degrees is below the set temperature for taking out hot water, the operation is carried out.Example I:X
C is about 'C when using four absorption refrigeration units.
As explained above, the present invention may be practiced using one absorption refrigerator, and the present invention can be practiced even when the load fluid is not limited to a cold temperature of 7F (:, but also cold and hot air). do not have.

As described above, the present invention provides the set temperature sensed by the outside air temperature detection section, the load fluid temperature sensed by the load fluid humidity detection section, and t.
Since the absorption chiller is controlled to start and stop in response to the change in load fluid vortex Q while being compared by the judgment unit, the absorption chiller is not started frequently due to load fluctuations C2 due to changes in outside air temperature. There is no need to stop the absorption chiller, the frequency of starting and stopping of the absorption chiller can be greatly reduced, the operating efficiency of the absorption chiller is improved, and it can be operated at low running costs throughout the year, making it a practical option. be.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an embodiment of the present invention, and FIG. 1g2 is a block diagram of a T circuit configuration showing an example of a control device of the present invention. flll--control device (8)...load fluid temperature detection section (9;...outside temperature detection S aa--calculation section QJ...judgment section 051...switch section

Claims (1)

[Claims] (1) An outside air temperature detection section, a calculation section that sets the take-out temperature of load fluid such as cold water according to the outside air temperature sensed by the detection section, a load fluid temperature detection section and the load fluid sensed by the detection section. It is characterized by comprising: a determination unit that determines whether to start or stop operation by comparing the temperature with the load fluid take-out temperature set by the calculation unit; and a switch unit that starts or stops operation based on a signal from the determination unit. Absorption chiller control device.