JPH0447569Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for easily checking the performance of a water cooler/heater.

[Conventional technology]

The performance of gas absorption type water coolers, refrigerators, boilers, etc. deteriorates due to impurities adhering to the internal pipes, a decrease in the amount of media, etc., and they require regular maintenance and inspection. However, various measuring instruments must be used to check the performance at this time.

[Problem that the invention attempts to solve]

However, measuring instruments for performance checks are special and expensive, and it has become difficult to prepare them for each piece of equipment.Therefore, there has been a demand for a means to easily check the performance of water coolers and hot water machines.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, a means for determining the difference between the inlet temperature and the outlet temperature of the water cooler/heater, a difference value detection means for detecting that the difference value obtained by this means is less than a certain value, and a capacity control valve opening of the water cooler/heater. an opening detection means for detecting that the opening is greater than a predetermined value; a display means for indicating a decrease in performance when the respective detected forces of each of these detection means occur simultaneously; and a display means for detecting a start command to the cold/hot water machine. a transient state detection means for detecting a period from when a change in the opening command to the capacity control valve is detected until a predetermined period of time has elapsed as a transient state of the water chiller/heater; and a blocking means for preventing the display means from displaying while the transient state is being detected by the transient state detection means.

[Effect]

Therefore, even if the capacity control valve of the water chiller/heater is opened at a predetermined value or higher, if the difference between the inlet temperature and the outlet temperature is less than a certain value, the performance of the chiller/heater will deteriorate. Therefore, these detected forces occur at the same time, and the display is made assuming that the situation is not a transient state immediately after starting the water chiller/heater or immediately after changing the opening of the capacity control valve, and this may cause a decrease in performance. is displayed.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing embodiments.

Fig. 2 is an instrumentation diagram, in which the outbound water pumped by the pump 1 is supplied via a water cooler/heater (hereinafter referred to as CHW) 2, a header 3, and a pipe line 4, and is supplied to load equipment such as a fan coil unit ( Hereinafter, water is returned to the header 7 via the pipe 6 via the LE) 5, and is again sent under pressure by the pump 1, where it circulates through the above-mentioned route. Thermometers 11 and 12 are provided in each of the pipes, so that the inlet temperature Ti and the outlet water temperature To can be measured individually.

In addition, these measurement outputs and the capacity control valve opening degree d of SHW2 are given to a monitoring device (hereinafter referred to as SUP) 13, where they are sent to a separate control device.
Together with the start command signal S and the capacity control valve opening command signal D given to the CHW 2, it is used to check the performance of the CHW 2.

The SUP 13 sends and receives data signals to and from the central control unit (not shown in the diagram) via the transmission path 19, and receives basic monitoring data while also transmitting monitoring data, etc. ing.

Figure 3 is a block diagram of the SUP13, which includes a processor such as a microprocessor (hereinafter referred to as CPU).
21, fixed memory (hereinafter referred to as ROM) 2
2. Variable memory (hereinafter referred to as RAM) 23, and
Interfaces (hereinafter referred to as I/F) 24 to 27 are arranged around the periphery, and these are connected by a bus bar.
Based on the input data Di such as each measurement output given via the I/F 24 and the data received via the communication I/F 25, the CPU 21 reads the data from the ROM 22.
It executes the instructions inside to perform check calculations and monitoring decisions.

Note that the CPU 21 stores the necessary data in the RAM 2 for check calculations and monitoring decisions.
At the same time, the command is executed while accessing the display unit (hereinafter referred to as DP) 2 via the I/F 26.
The display data is sent to the RAM 2 to display the monitoring status, and in response to the operation output of the keyboard (hereinafter referred to as KB) 30 via the I/F 27, the display data is sent to the RAM 2.
3, data is set or updated, and these are displayed using the DP 29.

FIG. 4 is a front view showing the operation panel of the SPU 13, which is provided with a multi-digit character display 31 and a plurality of indicator lights 32 corresponding to the parts to be monitored, and these constitute the DP 29.
30 is provided, and a character display 31 displays data or numerical values in alphanumeric characters or symbols and numbers, while an indicator light 32 provided corresponding to the nameplate 33 displays alarms, etc. It has become a thing.

FIG. 5 is a diagram showing the performance check status of CHW 2 by SUP 13, in which the inlet temperature Ti and outlet temperature To are determined according to the opening degree d of the capacity control valves such as gas valves, steam valves, vanes, and fuel valves of CHW 2. It is normal for the difference △T to be large, and if this is the relationship shown by the dotted line, for example, when the opening degree d is 50% or more and △T is less than the value shown by the solid line. In this case, it is only necessary to determine that the performance of CHW 2 has deteriorated, and in this example, the shaded area is in an abnormal state.

FIG. 6 is a flowchart of the monitoring status by the CPU 21, in which a "transient state?" 101 is determined according to changes in the start command S and the opening command D, and if this is N (NO), "X calculation" is performed. 111, and then “d” in response to the opening signal d from CHW2.
_V1 ? ”112, it is determined whether d is greater than or equal to a certain value V ₁ , and if this is Y (YES), “XV ₂ ? ”
113, it is determined whether or not X according to △T is less than the predetermined value _V2 . If this is also Y, the indicator light 32 in FIG. The configured timer determines whether this state has "elapsed for a certain period of time?" 122, and in response to Y, "keeps the indicator light on" 123 is performed, thereby indicating that the performance of the CHW 2 has deteriorated.

Note that the calculation in step 111 is performed using the following equation.

[(△T/d・k)/M]・100=X(%)… (1) ΔT: Ti-To when cooling, To-Ti when heating K: Correction coefficient M: Predicted normal rating Value Also, step 101 is Y or step 112,
When 113 and 122 are N, "X display setting?" 131 is determined by KB30 in FIG. 4, and if this is Y, "X display" 132 is determined by display 31 in FIG.
as a percentage value and step through “RET”.
Repeat steps 101 onwards.

FIG. 1 is a functional block diagram for carrying out the above monitoring, where the inlet temperature Ti and the outlet temperature To are given to a subtracter 61, where a temperature difference ΔT is determined, and the difference value detection means The comparator 62 as an opening value detecting means detects a value below a certain value, and the comparator 63 as an opening value detecting means detects that the opening degree d of the capacity control valve from the CHW 2 is equal to or higher than a predetermined value. Changes in S and opening command D are detected by the detection circuits 64 and 65, and a timer 66 is started according to these detection forces, and an AND gate 67 as a blocking means is turned off until the timer times up. It is supposed to be kept in good condition.

Therefore, immediately after the CHW 2 is started and the opening degree of the capacity control valve is changed, the AND gate 67 is turned off as a transient state by the timer 66, and at other times, the AND gate 67 is turned on, and each of the comparators 62 and 63 is turned off. If the power of detection occurs at the same time,
A drive signal is sent to the display 68 to display the performance deterioration.

Therefore, even with the configuration shown in FIG. 1, the same monitoring operation as in FIG. 6 is performed.

As described above, the performance of the CHW2 can be checked with a simple configuration without using any particular measuring instrument, and it is possible to prevent the CHW2 from operating with degraded performance and consuming excess energy, and to prevent maintenance and maintenance. Inspection becomes extremely easy.

However, the configurations in Figures 1 to 4 can be selected arbitrarily depending on the situation, and in Figure 6, the steps can be replaced or replaced with equivalent ones according to the conditions, or Various modifications are possible, such as omitting unnecessary parts.

[Effect of idea]

As is clear from the above explanation, according to the present invention, CHW performance checks are automatically performed with a simple configuration, making it easy to discover performance deterioration, maintenance, and inspection, and having a great effect on performance checks of various heat source equipment. is obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, Fig. 1 is a functional block diagram, Fig. 2 is a schematic diagram, Fig. 3 is a block diagram of the SUP, and Fig. 4 is a front view showing the operation panel of the SUP. FIG. 5 is a diagram showing the monitoring situation, and FIG. 6 is a flowchart of the monitoring operation. 2...CHW (cold/hot water machine), 4, 6...pipeline, 5
...LE (load equipment), 11, 12...Thermometer, 1
3...SUP (monitoring device), 21...CPU (processor), 22...ROM (fixed memory), 23...
RAM (variable memory), 24-27...I/F (interface), 61...subtractor, 62, 63
... Comparator, 64, 65 ... Characteristic circuit, 67 ...
AND circuit, 68...indicator.

Claims (1)

[Scope of Claim for Utility Model Registration] Means for determining the difference between the inlet temperature and the outlet temperature of a hot and cold water machine; a difference value detection means for detecting that the value of the difference by the means is less than a certain value; and the cold and hot water. opening detection means for detecting that the capacity control valve opening of the machine is equal to or higher than a predetermined value; display means for displaying a decrease in performance when the detection forces of the respective detection means occur simultaneously; The transient period of the water chiller/heater is defined as the period from when a start command to the water heater is detected until a predetermined period of time elapses, and from the time when a change in the opening command to the capacity control valve is detected until a predetermined period of time elapses. A performance check for a water cooler and hot water machine, comprising: a transient state detecting means for detecting the state; and a blocking means for preventing the display means from displaying while the transient state is being detected by the transient state detecting means. Device.