JPH02100701A - Operation control method for load capacity detector and plural heat source machines - Google Patents

Abstract

PURPOSE:To detect the load capacity of many loads with high accuracy by counting the load capacity in the form of the number of pulses. CONSTITUTION:When many large (10RT), intermediate (6RT), and small (2RT) optional refrigerating ton connected to respective terminals classified by load capacity in a pulse output control group 1 and an optional number of fan coils operate, respective counters 2C1-2Cn count pulses corresponding to the load capacity of the fan coils of normally open contacts RC10, RC6, and RC2 by the fan coils and their counted values are summed up. The programmable controller PC consisting of the pulse output contact group 1, a counter circuit 2, etc., outputs the total counted number as the total load capacity. Thus, the load capacity is counted in the form of the number of pulses, so the load capacity of many loads can be detected with higher accuracy than before. Consequently, variation in the load capacity can be detected at plural points with high accuracy.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fan coil used when heating or cooling one or both of the heating and cooling systems in a building using a plurality of heat source devices and fan coils. The present invention relates to a load capacity detector that detects operating negative d capacity and a method for controlling the operation of a plurality of heat source devices that switches the number of heat source devices in operation in accordance with the load capacity.

(Prior Art) Conventionally, as a method for controlling the operation of multiple heat source units by detecting load capacity that varies depending on the number of operating fan coils and switching the number of operating units of multiple heat source units in accordance with the detected load capacity, for example, There is a method in which when a fan coil group of different arbitrary capacity is activated, a switch for each fan coil group is activated to generate a voltage output corresponding to the number of actuations of each fan coil group.

(Problem to be solved by the invention) In this case, the value of the voltage output for each fan coil group must be adjusted one by one at the installation site according to the capacity of each fan coil group, and the result of this adjustment must be Not only is there a risk of going out of order due to voltage changes or temperature changes, but also because the operating order of multiple heat source devices that are controlled on and off depending on changes in load capacity 1 is predetermined. The operating time of each heat source unit will vary significantly, and the capacity of the heat source unit is relatively large, so depending on the point at which the load capacity fluctuates, the large-capacity heat source unit will frequently turn on and off. This has disadvantages such as not only adversely affecting the life of the heat source device but also interfering with the smooth operation of the heat source.

Therefore, an object of the present invention is to be able to detect changes in the zero load capacity ffi at multiple points with high accuracy, and to operate multiple heat source devices smoothly without hunting due to frontal fluctuations. The purpose of the present invention is to provide a method for controlling multiple heat source devices in series.

(Means for Solving the First Problem) The first invention for solving this problem is to generate a pulse with a width equal to the width of the stomach in a negative direction set in advance corresponding to the type of load capacity. At the same time, input the pulse output for each operating load capacity, count the number of clock pulses corresponding to the pulse width for each operating load capacity, and add the count number for each operating load capacity to the total count number. The load capacity detector has a total load capacity of .

(Function) First, in the case of the first invention, when a switch is turned on to check the load operating status for each load, the number of clock pulses counted with a pulse width corresponding to each load capacity is counted and , the total count number obtained by adding up the count numbers for each operating load capacity R1 is outputted to the outside as the total load capacity.

(Effects of the Invention) As described above, since the present invention counts the load capacity by the number of pulses, it is possible to detect the load capacity of an extremely large number of loads with high viscosity compared to the conventional method. This method has advantages such as being able to detect load capacity without requiring adjustment for each fan coil group on site.

(Means for Solving the Second Problem) Next, the second invention for solving this problem includes at least one small-capacity heat source device and at least two or more medium- or large-capacity heat source devices. One or both heat source devices and the plurality of heat mta
A plurality of heat exchangers with a preset arbitrary capacity for supplying heat energy from the heat exchanger to the outside, and a load capacity detector that detects a load capacity that varies depending on the number of operating cough heat exchangers, When the output value corresponding to the load capacity from the load capacity detector is within the small capacity value of the heat source device, only the small capacity heat source device is operated, and the output value corresponding to the load capacity from the load capacity detector is When the value exceeds the small capacity value of the heat source equipment, the combined operation of the small capacity heat source equipment and the heat source equipment for the medium-capacity suspension or personnel compartment is carried out in advance to accommodate the load capacity from the load capacity detector. The present invention provides a method for controlling the operation of a plurality of heat sources, which prioritizes and shuts off only the small-capacity heat source devices when the output value decreases below the capacity value of the plurality of heat source devices.

(Function) Heat source II configured like this! In the multiple unit operation control method, for example, if there are three heat source machines of large, medium, and small capacity, the small capacity heat source machine will operate when the load capacity is within the small capacity, and when the load capacity exceeds the small capacity, the small capacity heat source machine will operate. At that time, two medium and small capacity heat source machines are in operation, and when the load capacity reaches medium capacity part F, the small-sized heat source machine stops operating, and only the medium capacity heat source machine is 5lIill+, ,,Furthermore, the load capacity L
When H becomes less than the small capacity, the medium capacity heat source machine is stopped while the small capacity heat #1 machine is operated, and only the small capacity heat source machine is operated, and the load capacity is larger than the large capacity. When this occurs, the operation of the large, medium, and small capacity heat source equipment is controlled in substantially the same manner as described above.

(Effects of the invention) In this way, when the load capacity increases or decreases, the operation of the small-capacity heat source equipment is turned on, off, +
+ m, so there is less loss in heat source equipment operation, and the fluctuation range is small, so there is less shock when switching the operation of multiple heat source equipment.
There is an effect that smooth operation control of a plurality of heat source devices can be ensured without frequently repeating the off operation.

(Example) Next, the configuration of an example of the present invention will be described with reference to the drawings.

As shown in Fig. 1, pulse output contact group 1 of a programmable controller (PC) that generates pulses of different widths for each preset load capacity corresponding to the type of load capacity.
, for example, IRT (refrigerated ton), 1.5RT, 2RT~
7Rr separate clock pulses, in this case, the clock pulses (second
(see figure) 2 pulse count, 3 pulse count -1
Each load capacity terminal t1, tl, 5, t2 to t7 of the pulse output contact group 1 (see Fig. 2), which consists of a plurality of capacity setting contacts that output a pulse of 4 pulse counts, is connected to a multi-heat exchanger (not shown). , in this embodiment, normally open relay contacts RC2, PC6, and RCIO for each fan coil operate on and off in conjunction with each refrigeration ton fan coil, in this case, 2.6 and 10 refrigeration ton fan coils, respectively. One terminal is connected, and the other terminal is connected to each counter 2CI, 2G2 to 2On of the load calculation counter circuit 2 which calculates the total load capacity by the number of counts. In this case, the other terminal of the contact RC6 The end f is connected to the counter 2C2, and the other terminal of the contact RCIO corresponds to the fact that one terminal is connected to the terminal t5 for 5 refrigeration tons of pulse output contact group 1 for a load capacity of 10 refrigeration tons. The contact RC2 is connected to two counters 2C3 and 204, and the other terminal of the contact RC2 is connected to the counter 2C5.

In addition, each load capacity terminal t1, t of pulse output contact group 1
1, 5, t2 to t7, an arbitrary number of fan coils (not shown) are grouped together as another group, and pulses of a width corresponding to the load capacity actually operating within these separate groups are sent to the contacts. One end of the normally open relay RCx in the relay box 3 is connected to the positive side of the DC power supply DC, and the other terminal of the contact RCx is connected to the counter 2CI of the counter circuit 2 dedicated to load performance. The programmable controller PC outputs a count value corresponding to the total load capacity actually operated.

Next, the operation of this embodiment will be explained.

In the load capacitance detector configured in this way, a large number of large (10Rr )・Medium (6RT)・Small (2RT)
When any number of refrigeration fan coils are activated, each fan coil normally open relay contact RC10, P
The number of pulses corresponding to the load capacity of the fan coils C6 and RC2 is counted by each counter 2C1, 202 to 2Cn, and each count is added up to 81, and a programmable controller PC consisting of a pulse output contact FT1, a counter circuit 2, etc. From then on, the summed total count number is outputted to the outside as the total load capacity.

In this way, the load capacity is counted by the number of pulses, so
It is possible to detect the load capacity of an extremely large number of loads with high precision compared to conventional methods, and there is no need to adjust the output voltage value etc. for each fan coil group during installation.
Load capacity can be detected extremely easily with a simple configuration.

Next, a method of operating a plurality of heat source machines M a11 using this load capacity detector will be explained with reference to the flowchart of FIG. 3 and the operating characteristic diagram of FIG. 4.

In this way, the output from the programmable controller PC, which consists of the pulse output contact group 1 and the counter circuit 2, is actually a programmable controller that connects a large number of large (10Rr), medium (6Rr), and small (2RT) fan coils. In a method for controlling the operation of multiple heat source devices based on the output of a controller PC, for example, if there are three heat source devices of large (30 RT), medium (20 RT), and small (10 RT) capacity, step When the presence of negative bias is detected in step 101, that is,
When a count output corresponding to the load operation is generated from the programmable controller PC consisting of the pulse output contact group 1 and the load operation dedicated counter circuit 2, etc., in step 102, it is determined whether the load lifting is large, medium, or small according to the count value. When the load lifting is small, a small (10RT) capacity heat source machine is operated in step 103, and a small (10RT) capacity heat source machine is operated in step 104.
0RT) capacity heat source equipment continues to operate, and in step 105 it is determined whether the load m is greater than or equal to the small (10RT) capacity of the heat source equipment, and if it is within the small (IORT) capacity, the load is It is determined whether or not it is 0. If it is not 0, the process returns to step 105 and the small (10R)
T) Capacity operation continues, and when it is determined in step 106 that there is a load, in step 107 the small (IORT) of the heat source equipment is
At the same time as the operation of the capacity is stopped, it is confirmed in step 108 that all operations of the heat source equipment have been stopped.

Next, in step 105, the load is lifted to the heat source machine small (10RT).
If it is determined that the capacity is higher than the capacity, in step 109 the medium (20R)
T) When the capacity heat source machine is operated, step 11
0, the operation of the medium + small (20 + 10R) capacity heat source equipment continues, and furthermore, in step 111, the load lifting is reduced to medium + small (20 + 10R) capacity heat source equipment <20.
RT) It is determined whether 30% or more of the capacity continues for 10 minutes, and 30% or more of the capacity in the heat source unit (20RT) is
If it does not continue for 20 minutes, in step 112 (20 RT
) capacity, the operation of the heat source machine is stopped, and the operation of the small (IORT) capacity heat source machine after step 104 is continued, and in step 111 the heat source machine is stopped, and in step 111, the heat source machine is stopped.
When it is determined that continuous operation for 10 minutes with i30% or more is required, it is determined in step 113 whether the load is greater than or equal to the capacity of the core (1)\(20+10RT), and the
) capacity, it is further determined in step 114 whether the load lifting is operating at 80% or less of the capacity of the heat source unit (20RT), and when the load lifting is operating at 80% or more of the capacity of the heat source unit (20RT), step 113 Returning to step 11, the medium + small (20 + 10 RT) capacity operation of the heat source equipment continues as it is.
When it is determined in step 4 that the capacity between the loads is 80% or less of the capacity of the heat source unit (20R-r), in step 115 the capacity of the heat source unit is
The operation of the ORT) capacity is stopped and the medium (
The operation of the 20RT) capacity heat source equipment continues, and furthermore, in step 117 it is determined whether the load is equal to or greater than the medium (20RT) capacity, and when the load is equal to or greater than the medium (20RT) capacity, the operation of the heat source equipment is continued in step 118. IORT) capacity is operated, and in step 119 the medium + small (20 + 10 RT) capacity heat source machine continues to operate, and at step 113, the medium + small (20 + 10 RT) capacity operation of the heat source machine continues, In step 117, the load m is in the heat source machine (20RT
) When it is determined that the capacity is not greater than the capacity, further step 1 is performed.
20, it is determined whether the load amount is 30% or less of the capacity of the heat source equipment (20RT), and if it is not 30% or less, step 1
Returning to step 17, the operation of the core small (20+10RT) capacity of the heat source machine continues as it is, and when it is below 30%, step 1
In step 21, it is determined whether the load is O or not, and if it is O, step 1 is executed.
At step 22, the operation of the medium (20 RT) capacity heat source machine is stopped, and when the stop of all operations of the heat source machine is confirmed at step knob 108, and when it is determined that c'4A is not O at step 121, step 123 While the small (IORT) capacity of the heat source equipment is being operated, the operation of the medium (20RT) capacity heat source equipment is stopped, and the process returns to step 104 to restart the small (IORT) capacity.
10RT) The operation of the capacity heat source equipment continues.

Next, in step 113, the negative part is the core small (20+10RT
), when it is determined that the capacity is larger than (3), in step 124
At the same time, in step 125, the heat source machines with a capacity of 0R (0 RT) are operated, and in step 125, the heat source machines with a capacity of large, medium, and small (30 + 20 + 10 RT) are continued to operate.
It is determined whether or not the capacity in the heat source machine (20 RT) continues for 10 minutes, and the capacity in the heat source machine (20 RT) is 73 or more.
If it does not continue for 3 minutes, the large and small (3
At the same time, in step 116, the operation of the medium (20RT) capacity heat source device is continued, and in step 126, it is determined that the operation continues for 10 minutes at the medium (20RT) capacity or higher. Then step 1
At step 28, the operation of the small (10 RT) capacity of the heat source equipment is stopped, and at step 129, the operation of the large capacity (30 + 2 OR) heat source equipment is stopped.
, T) operation of the capacity heat source machine continues, step 130
In step 131, it is determined whether the zero load is greater than the capacity of the heat source machine (30 + 20 RT), and if it is not greater than the capacity of the heat source machine (30 + 208 T), further, in step 131, the load It is determined whether or not the operation is over 80%, and when the operation is over 80% of the heat source fighting dog (30RT) capacity, the process returns to step 130 and the heat source machine is operated in the large soil (
30+20RT) capacity operation continues, step 131
When it is determined that the load lifting is less than 80% of the heat source fighting dog (30RT) capacity, in step 132 the load lifting is determined to be less than 80% of the heat source fighting dog (20RT) capacity.
) capacity operation is stopped and in step 133 large (30R
T) ffffi The operation of the heat source machine continues, and further, in step 134, it is determined whether the load hanging is greater than the heat source fighting dog (30 RT) capacity, and when it is greater than the large (30 RT) capacity, in step 135, the load is ) capacity is operated, and in step 136 the operation of the large underground (30 + 20 RT) capacity ld heat source equipment is continued, and the process returns to step 130, where the operation of the large earth underground (30 + 20 RT) capacity of the heat source equipment is continued, and in step 134 The load amount is naturally large (3
When it is determined that the 0RT is not greater than the capacity, it is determined in step 137 whether the 0 load is less than 30% of the capacity of the heat source machine (30RT), and if it is not more than 30%, the process returns to step 134 to If the large (30R-r) capacity operation continues and is below 30%, step 138
It is determined whether the load is O or not, and if it is O, step 139
When the operation of the large (30RT) capacity heat source equipment is stopped at step 108, the stoppage of all operations of the heat source equipment is confirmed at step 138, and when it is determined that the load is not O, at step 140, the operation of the large capacity heat source equipment is stopped. (IORT) capacity is in operation, the operation of the large (30 RT) capacity heat source equipment is stopped, and the process returns to step 104 to
) The capacity heat source equipment continues to operate.

Next, in step 130, the load is set to 30 + 20 RT.
), when it is determined that the capacity is larger than the capacity (1), in step 141
0RT) capacity heat source equipment is operated, and in step 142, the operation of the heat source equipment with a capacity of 30 + 20 + 10 RT is continued, and in step 143, the load lifting is less than 80% of the capacity of the individual heat source (30 + 20 RT). When it is determined that it is 80% or less, the operation of the small (10RT) capacity of the heat source machine is stopped in step 144, and the operation of the large capacity (30+20RT) capacity heat source machine is continued in step 129. In addition, when the load G determined according to the count value in step 102 is medium, in step 145 it is determined that the load G is medium (20
RT) capacity heat source equipment is operated, and Step 1
In Step 16, the medium (20 RT) capacity heat source machine continues to operate, and similarly, when the load suspension determined according to the count value in Step 102 is large, in Step 146, the large (30 RT) capacity heat source machine is operated, In step 133, large (
30 RT) The operation of the capacity heat source equipment continues.

As explained above, in this multiple heat source equipment operation control method, when the load capacity increases or decreases, the operation of the small capacity heat source equipment is first controlled on and off, so there is less loss in heat source operation, and Because the variable V width is small, there is less shock when switching the operation of multiple heat source machines, and it is possible to prevent the Daikan 13 heat source machines from repeatedly turning on and off. This control allows for small, medium, and large capacity East German operation of each heat source unit, and as the operating load capacity increases, control is changed from small capacity to medium capacity as shown in Figure 4. Control, control based on large capacity The rotation of heat source and heat source that changes sequentially is performed smoothly, and the operation of multiple heat source machines can be smoothly controlled.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of a load capacity detector according to an embodiment of the present invention, Fig. 2 is its operation diagram, and Fig. 3 is a flowchart of a method for controlling the operation of multiple heat source devices using the load capacity detector. Fig. 4 is a graph of the characteristics. 1... Pulse output contact group 2... Counter circuit C2 C6 R (,10... Relay contact

Claims (2)

[Claims] (1) Generate pulses with different widths for each load capacity preset according to the type of load capacity, input the pulse output for each operating load capacity, and calculate the number of clock pulses corresponding to the pulse width for each operating load. Count by capacity,
A load capacity detector characterized in that the total count number obtained by adding the count number for each operating load capacity of the count number is the total load capacity. (2) At least one small capacity heat source device and at least two
one or both of the medium or large capacity heat source devices, a plurality of heat exchangers with a preset arbitrary capacity for supplying heat energy from the plurality of heat source devices to the outside; and a load capacity detector that detects different load capacities depending on the number of operating exchangers, and when the output value corresponding to the load capacity from the load capacity detector is within the small capacity hanging value of the heat source equipment, the output value is small. When only a large capacity heat source machine is operated, and the output value corresponding to the load capacity from the load capacity detector exceeds the small capacity value of the heat source machine, a small capacity heat source machine and a medium or large capacity heat source machine are operated. When the output value corresponding to the load capacity from the load capacity detector becomes smaller than the capacity value of the operation of multiple heat source devices, only the small capacity heat source device is prioritized and shut down. Features a method for controlling the operation of multiple heat source machines.