JPH0674619A - Operation monitoring and controlling device for refrigerator in cold heat plant - Google Patents

Abstract

PURPOSE:To estimate a load and enable an automatic excitation and an automatic stopping of an operation of a refrigerator to be carried out under a suitable timing. CONSTITUTION:A load estimating means 1 for estimating a load in a refrigerator, an operation schedule making means 2 for making an operation schedule of the refrigerator, an output calculating means 3 for calculating a total output of the refrigerator, a displaying means 4 for concurrently displaying the estimated load and the output of the refrigerator, an excitation discriminating means 5 for discriminating whether the excitation of the refrigerator is required or not, and a stopping state discriminating means 6 for discriminating whether the refrigerator is required to be stopped or not are provided. With such an arrangement, since the refrigerator can be energized or stopped under a suitable timing while estimating a load of the freezer, training of an operator is not required and labor saving can be attained and concurrently an efficient operation of the cold heat plant can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating machine operation monitoring control device for a cold heat plant, which is provided with a plurality of refrigerating machines and controls the number of refrigeration machines.

[0002]

2. Description of the Related Art In the operation of a refrigerator in a conventional cold heat plant, an operator constantly monitors the amount of cold heat used by the customer (hereinafter referred to as load) by using a load amount trend screen, and the load increases. If there is a tendency, a new refrigerator is started based on the schedule that has been created in advance, and if the load tends to decrease, one of the refrigerators that are operating based on the schedule is started. The number of operating vehicles was switched by stopping the operation.

[0003]

Regarding the conventional operation of the refrigerator for switching the number of operating units according to the increase or decrease of the load, in recent years, due to expansion of plant scale and diversification of heat source equipment (refrigerator) constituting the plant. It is becoming difficult to predict the tendency of load increase / decrease, and it is becoming difficult to determine the timing for starting / stopping the refrigerator due to load fluctuations. It has been desired to provide a device that enables the above.

The present invention has been made by paying attention to the above-mentioned problems, and an object thereof is to automate load prediction and refrigerator operation schedule creation, and schedule the predicted load waveform. An object of the present invention is to provide an operation monitoring device that automatically determines the start and stop timings of a refrigerator while comparing the maximum load values that can be covered by the refrigerator.

[0005]

A refrigerating machine operation monitoring control device for a cold heat plant according to the present invention comprises a load predicting means for predicting a demand load of cold heat, and a refrigerating machine at each time based on a predicted load amount input from the means. An operation schedule creating means for planning the number of operating machines, an output calculating means for calculating the total output of the refrigerators based on the number and types of the refrigerators operated at each time input from the means, the load predicting means and the output calculating means. Display means for superimposing and displaying the predicted load of cold heat and the output of the refrigerator using the data respectively input, and the refrigerator using the data respectively input from the load predicting means, the operation schedule creating means and the output calculating means. It is characterized in that it comprises a start determination means for determining whether or not to start and a stop determination means for determining whether or not to stop the refrigerator.

[0006]

In the above, first, the load predicting means makes a judgment from the past load record and meteorological factors, and predicts the load waveform of one day at the stage of the day before the refrigerator operating day. Predict future load trends.

The operation schedule creating means creates an operation schedule of the refrigerator for one day based on the load waveform predicted by the load predicting means. The output calculation means uses the operation schedule data of the refrigerator created by the operation schedule means to calculate the total value of the rated output of the refrigerator scheduled to be operated at each time.

The display means uses the data output by the load predicting means and the output calculating means, respectively, to calculate the predicted load waveform and the total value of the rated output of the refrigerator, that is, the expected operation of the refrigerator. Maximum load possible,
Furthermore, the actual load value and the predicted load value several hours ahead are visualized in a graph.

The start determination means inputs data from the load predicting means, the operation schedule creating means, and the output calculating means, respectively, and predicts the load several hours ahead and the refrigerator to be operated at that time. The maximum load amount that can be covered is compared, and if the predicted load exceeds a certain ratio of the maximum load of the refrigerator, a start command is output to the refrigerator scheduled to start next.

On the other hand, in the stop judging means, data is respectively inputted from the load predicting means, the operation schedule creating means and the output calculating means, and the predicted value of the load several hours ahead and the refrigeration scheduled to be operated at that time. The maximum load that can be covered by the machine is compared, and if the predicted load is below a certain percentage of the maximum load of the refrigerator, a stop command is output to the refrigerator that is scheduled to stop next. To do.

As described above, since it is possible to start and stop the refrigerator at an appropriate timing while predicting the load on the refrigerator, it is possible to save labor without requiring the skill of an operator. , To realize efficient operation of cold heat plant.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1 is a load predicting means for predicting a load of cold heat, 2 is an operation schedule creating means for planning start / stop times of each refrigerator based on the load prediction result by the load predicting means 1, and 3 is the same. Operation schedule creation means 2
The output calculation means 4 for calculating the maximum load amount that can be covered by the number of operating vehicles scheduled by means of the predicted load and the actual load by the load predicting means 1, and the number of operating vehicles scheduled by the operation schedule creating means 2. Display means 5 for graphically displaying the maximum load amount that can be covered is a load prediction value obtained by the load prediction means 1 after a few hours and the refrigerator currently in operation obtained by the output calculation means 3. When the predicted value of the load exceeds the load amount that can be covered by the refrigerator currently in operation, the start command 16 is issued to the refrigerator planned to be operated next. Start determination means to output,
6 is the same as the start determination means 5, and compares two values, and outputs a stop command 17 to the refrigerator to be stopped next when the predicted load amount falls below 30% of the output of the refrigerator. It is a determination means.

In the above, when the apparatus of this embodiment is started on the day before the operating day of the refrigerator, first, the load predicting means 1 loads the load waveform of the refrigerator on the following day, that is, on the operating day (in FIG. 2 (a)). X) is predicted.

This prediction utilizes the fact that there is a correlation between past actual load values and meteorological conditions, and the weather forecast data of the driving day and past actual load and meteorological data 11 are input and statistical processing is performed. Done.

The daily load waveform 12 thus predicted is input to the operation schedule creating means 2, and the operation schedule creating means 2 predicts the predicted load amount at each time as shown in FIG. 2 (b). The number of operating refrigerating machines 13 and the operating schedule 15 required to cover the above are determined.

The above-mentioned number of operating machines is determined in consideration of the conditions that the total value of the rated output is equal to or more than the predicted load quantity and is close to the predicted load quantity, and the number of switching refrigerators between each time is small. This calculation can be processed at high speed by using dynamic programming.

The refrigerator operating machine number data 13 at each time obtained as described above is input to the output calculating means 3 and the total value 14 of the rated outputs of the refrigerator operating here (Y in FIG. 2A). Is required.

On the other hand, on the day of operation, first, the actual load up to that point and the meteorological data 11 such as temperature and humidity are input to the load predicting means 1, and the predicted value 18 of the load 1 to 3 hours ahead is obtained. To be

On the display means 4, three data of the predicted load waveform 12 for one day output from the load prediction means, the total output value 14 of the scheduled refrigerator and the actual load and the predicted load 12 up to several hours ahead are shown. Is displayed on the same graph to support the work of the plant operator. A display example of this graph is shown in FIG.

In FIG. 2A, the daily load waveform X predicted at the stage of the previous day and the maximum load amount (total value of rated output) Y that can be covered by the scheduled refrigerator are drawn at the time of screen display. Then, the actual load and the trend prediction value Z up to several hours ahead are displayed on the display in the form of progressing with the current time.

Therefore, the plant operator can visually know how much margin the load factor of the refrigerator has by looking at the deviation between the Y value and the Z value at a certain time.

A deviation is calculated between the Z value and the Y value shown in FIG. 2A, and the Z value is Y one hour ahead of the current time.
If the value exceeds 100%, the operation schedule 15
Based on this, the start determination means 5 outputs the start command 16 to the refrigerator scheduled to start next, and when the value of Z is less than 30% of the value of Y, the stop is scheduled next. The stop determination means 6 outputs a stop command 17 to the refrigerator.

The above-mentioned values of 100% and 30% are examples of judgment values, and it goes without saying that they can be changed to other numerical values.

As described above, labor can be saved and the operating efficiency of the plant can be improved by automating the switching of the number of operating refrigerators, which has been entrusted to the experience of skilled operators.

[0025]

The refrigerating machine operation monitoring and controlling apparatus for a cold heat plant according to the present invention comprises load predicting means for predicting the load of the refrigerating machine,
An operation schedule creating means for creating an operation schedule of the refrigerator, an output calculating means for calculating the total output of the refrigerator, a display means for simultaneously displaying the predicted load and the refrigerator output,
By providing a start determination means for determining whether or not the refrigerator needs to be started and a stop determination means for determining whether or not the refrigerator needs to be stopped, the refrigerator is started at an appropriate timing while predicting the load of the refrigerator.・ Because it is possible to stop,
The operator's skill is not required, labor can be saved, and efficient operation of the cooling / heating plant is realized.

[Brief description of drawings]

FIG. 1 is a block diagram according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a display screen displayed by the display unit according to the embodiment.

[Explanation of symbols]

 1 Load Prediction Means 2 Operation Schedule Creation Means 3 Output Calculation Means 4 Display Means 5 Start Judgment Means 6 Stop Judgment Means

Claims (1)

[Claims] 1. A load predicting means for predicting a demand load of cold heat, an operation schedule creating means for planning the number of operating refrigerating machines at each time based on the predicted load amount input by the means, and each input by the same means. Output calculation means for calculating the total output of the refrigerator from the number and type of refrigerators operating at the time, and the predicted load of cold heat and the output of the refrigerator using the data respectively input from the load prediction means and the output calculation means. Display means for overlapping display, start determination means for determining whether or not to start the refrigerator using the data respectively input from the load prediction means, operation schedule creation means and output calculation means, and stop the refrigerator A refrigerating machine operation monitoring control device for a cold heat plant, comprising: a stop determination means for determining whether or not the refrigeration operation is performed.