JP5062555B2 - Energy saving air conditioning control system - Google Patents

Description

  The present invention relates to an energy-saving air-conditioning control system that efficiently reduces the air-conditioning load of a plurality of air-conditioners arranged in the same space while ensuring a work environment and reduces power consumption.

  In general office buildings, about 40% of the power consumption is consumed by air conditioning equipment. The amount of power consumed by air conditioning equipment varies greatly depending on external weather conditions (external temperature, solar radiation, etc.) and the heat storage status of the building (nighttime, holidays, etc.). Since the load increases, the power consumption increases accordingly.

In conventional energy-saving air-conditioning control systems, pre-cooling / pre-heating control that operates the air-conditioning equipment earlier than the normal operation time, as well as cooling the chilled water or hot water while the cooling or heating is stopped, to reduce the demand value at the maximum load. Circulate through the water circulation pipe and the heat exchanger of the air conditioner, and the temperature of the cold water or hot water in the cold / hot water circulation pipe just before the start of cooling or heating and the temperature of the heat exchanger of the air conditioner are the cold water temperature or heating during the cooling An operation method for maintaining the temperature close to the temperature of the hot water is considered (hereinafter referred to as “known example 1”). Further, in the applicant's patent application (hereinafter referred to as “public example 2”), an energy saving control system for a multi air conditioner that performs energy saving distributed control in accordance with an air conditioning load by a plurality of systems in which the multi air conditioner is divided into a plurality of groups. A measuring means for measuring information for calculating an air conditioning load, and an air conditioning load at a preset time based on the measurement information measured by the measuring means, and a thermo-off corresponding to the air conditioning load level. An operation control device that performs thermo-off control according to a predetermined priority order for each of the plurality of systems according to a control time, and the operation control device increases the thermo-off control time as the air conditioning load level becomes lighter. We are proposing an energy-saving air-conditioning control system that lengthens
JP 2004-108658 A JP 2006-38334 A

  However, in the precooling / preheating control of the above-mentioned known example 1, the main purpose is to converge the indoor environment to an appropriate value at the business start time, and the operation time is calculated by calculating many parameters such as the outside air condition, the room temperature, and the air conditioning function. In addition, in the method of circulating cold water or hot water while cooling or heating is stopped, a two-way valve installed on the outlet side or inlet side of the heat medium to the air conditioner and a bypass pipe that communicates with the two-way valve Either or both of the installed on-off valves must be opened during cooling or heating stop to continue the operation of the circulation pump. Although some recent air conditioners have a function of performing inverter control at light loads, there is a problem that performance efficiency at light loads does not increase. Further, in the known example 2, the system-specific operation control of the air conditioning equipment is performed by simple control while ensuring the work environment, and particularly the performance efficiency at a light load can be improved and the power consumption can be reduced. However, as a result of the actual air conditioning operation, it was found that the air conditioning load of the plurality of air conditioners arranged in the same space varies greatly depending on the various conditions of the arrangement position, and all the plurality of air conditioners arranged in the same space are all However, when thermo-off control (intermittent control) was performed, it was found that there was a limit in increasing the coefficient of performance of air conditioning equipment.

  The present invention solves the problems of the prior art, and can efficiently reduce the air conditioning load of a plurality of air conditioners arranged in the same space while ensuring a work environment, thereby reducing power consumption. The purpose is to provide an energy-saving air-conditioning control system.

In order to solve the above problem , the energy-saving air conditioning system of the present invention includes a plurality of air conditioners that respectively air-condition each section of the same space, and connects the plurality of air conditioners to a control device via a network, The control device is configured to classify the plurality of air conditioners into base machines and auxiliary machines based on the past air condition load data that varies depending on the past season, time, and amount of solar radiation for each section in which the plurality of air conditioners are arranged , and setback. Storage means for storing a control pattern comprising a time and a setback temperature, and the base machine operates in a high-load or medium-load operation mode until the setback time is reached based on the stored control pattern, and after the setback time has elapsed. Operate in low-load operation mode or intermittent operation mode until the setback temperature is reached, and the auxiliary machine is based on the stored control pattern. Until it comes the setback time driving a high load or middle load, after setback time is operated in the blowing operation mode, and operation after reaching the set-back temperature, the base machine and the auxiliary machine at a predetermined time air blowing mode, After a predetermined time has elapsed, the base machine and the auxiliary machine are controlled to operate in an initial operation mode .

In addition, the energy saving air conditioning system of the present invention includes the maximum value, the minimum value, the average value, the number of off times, the current value of the power load factor for each operation state of medium load operation, low load operation, intermittent operation, and off operation in the latest N minutes The power load factor data is acquired by sampling a plurality of times, and the air conditioner is controlled so that the degree of energy saving in each operation state is further improved based on the comparison between the data acquired in the last N minutes and the set value. It is characterized by.

Moreover, the energy-saving air-conditioning system of this invention classifies the rank of an energy-saving degree into a some mode, and sets the setting of the length of the off time and the setting of off time according to the driving | running state for each mode so that it may differ. It is characterized by that.

A plurality of air conditioners that respectively air-condition each section of the same space are arranged, the plurality of air conditioners are connected to a control apparatus via a network, and the control apparatus is provided for each section in which the plurality of air conditioners are arranged. Storage means for storing a control pattern consisting of a base unit of the plurality of air conditioners, a classification to an auxiliary unit, a setback time, and a setback temperature based on past air conditioning load data that varies depending on the past season, time, and amount of solar radiation The base machine operates in the high load or medium load operation mode until the setback time is reached based on the stored control pattern, and operates in the low load operation mode or the intermittent operation mode until the setback temperature is reached after the setback time has elapsed. The auxiliary machine operates at high load or medium load until the setback time based on the stored control pattern. After click time is operated in the blowing operation mode, after reaching the set-back temperature, the base machine and the auxiliary machine is operated for a predetermined time air blowing mode, after a predetermined time has elapsed, the initial and the base machine and the auxiliary machine the configuration for controlling to operate at the operation mode, after setback time base unit only low load operation mode or on, since operating in intermittent operation mode off control, based on all of the air conditioner in the room environment Compared to a system that controls the system, the air conditioning load can be efficiently reduced while maintaining the work environment, and the power consumption can be reduced.
Also, the power load factor for each operating state of start, restart, high load operation, medium load operation, low load operation, intermittent operation, and off operation of the air conditioner divided into base machine and auxiliary machine in the last N minutes Data of maximum value, minimum value, average value, number of off times, current power load factor is obtained by sampling a plurality of times, and the energy saving degree in each operation state based on the comparison between the data obtained in the last N minutes and the set value With the configuration in which the air conditioner is controlled so as to improve further, fine control can be performed according to the latest operating state of each air conditioner, and the power consumption can be further reduced.
The energy saving rank is divided into multiple modes, and each mode is switched off and the length of the off time is set differently. Control becomes possible.

  An embodiment of an energy saving air conditioning control system of the present invention will be described with reference to the drawings. FIG. 1 shows a plurality of air conditioners 1 and 2 that respectively air-condition each section of the same space in a library room (air-conditioning area 544 m 2) on the third floor of a building for explaining an embodiment of the energy-saving air-conditioning control system of the present invention. It is a figure which shows the 3 and 4 air-conditioning division. The air conditioner 1 air-conditions the southeast section, the air conditioner 2 air-conditions the northeast section, the air conditioner 3 air-conditions the central section, and the air conditioner 4 air-conditions the southwest section.

  FIG. 2 is a block diagram showing the concept of the energy saving air conditioning control system of the present invention. The air conditioners 1 to 4 are connected to the control device 5 via a network. The control device 5 is connected to an indoor environment sensor 6 that measures the indoor temperature and humidity in the surrounding compartments of the air conditioners 1 to 4 and an outdoor air environment sensor 7 that measures the temperature, humidity, and amount of solar radiation. The control device 5 is connected to a power meter 8 that measures the amount of power consumed by driving the air conditioners 1 to 4.

  The control device 5 includes storage means 9 for storing control patterns of the air conditioners 1 to 4 according to the past indoor environment and outdoor air environment. The control device 5 is a control for setting the control patterns of the air conditioners 1 to 4 stored in the storage unit 9 based on the measurement data of the indoor environment sensor 6 and the outside air environment sensor 7 arranged in each section at the start of operation. The pattern setting means 10 and the operation control means 12 for controlling the operation of the air conditioners 1 to 4 with the set control pattern are provided.

  FIG. 3 is a diagram showing a control pattern of the energy saving air conditioning control system of the present invention. In the control pattern of the present invention, the air conditioners 1 and 2 are classified as the base machine 13 and the air conditioners 3 and 4 are classified as the auxiliary machines 14 (number control). The classification of the base machine 13 and the auxiliary machine 14 is set based on the past air conditioning load record data of the air conditioners 1 to 4. Since the air conditioning load of the air conditioners 1 to 4 that air-condition each section of the same floor varies depending on the season, time, and amount of solar radiation, the base machine 13, the auxiliary machine 14 and the base machine 13, The control pattern consisting of the number of auxiliary machines 14, the setback time, and the setback temperature also varies.

  In the control pattern of the present invention, the base machine 13 is operated in the high load or medium load operation mode until the setback time is reached as shown in FIG. 4, and is operated at a low load until the setback temperature is reached after the setback time has elapsed. The auxiliary machine 14 is controlled so as to operate in the intermittent operation mode during the mode or on / off control, and is operated so as to operate in the high-load or medium-load operation until the setback time and after the setback time elapses. To do. Since the setback temperature and the setback time are set based on the past air conditioning load record data of each of the air conditioners 1 to 4, the setback temperature and the setback time vary depending on various conditions. Since the air conditioners 1 to 4 are divided into the base machine 13 and the auxiliary machine 14 (number control), after the setback time has elapsed, only the base machine 13 is operated in the low load operation mode or the intermittent operation mode of the on / off control. Compared to a system that controls intermittent operation of all the air conditioners 1 to 4 based on measurement data of the indoor environment sensor 6, it is possible to efficiently reduce the air conditioning load and reduce power consumption while maintaining the work environment.

  FIG. 5 is a flowchart showing the operation of the energy saving air conditioning control system of the present invention. Control patterns of the air conditioners 1 to 4 that air-condition each section of the same floor are stored in the storage unit 9 corresponding to the indoor environment and the outdoor air environment based on the past air conditioning load record data. At the start of operation of the air conditioners 1 to 4, data measured by the indoor environment sensor 6 and the outside air environment sensor 7 are input to the control device 5. The control device 5 sets the input measurement data and the control pattern stored in the storage means 9 by the control pattern setting means 10. The control pattern is a setting of the air conditioners 1 to 4 to the base machine 13 and the auxiliary machine 14, setback time, and setback temperature.

  The operation of each of the air conditioners 1 to 4 is started. The setback time set by the control pattern is set as the operation holding time. Initially, the air conditioners 1 to 4 operate in the high load or medium load operation mode regardless of the difference between the base machine 13 and the auxiliary machine 14 until the operation holding time is reached. When the operation holding time elapses, the air conditioners 3 and 4 set as the auxiliary machines 14 among the air conditioners 1 to 4 are operated by switching to the air blowing operation mode. The air conditioners 1 and 2 set as the base machine 13 are controlled to operate in the low load operation mode or the intermittent operation mode until the setback temperature is reached after the operation holding time has elapsed. After the setback time has elapsed, only the base unit 13 is operated in the low load operation mode or the intermittent operation mode of on / off control, so that all the air conditioners 1 to 4 are controlled based on the indoor environment. While maintaining the environment, the air-conditioning load can be reduced efficiently and the power consumption can be reduced.

  FIG. 6 is divided into a base machine 13 and an auxiliary machine 14 when the air conditioners 1 to 4 for air-conditioning each section of the same floor shown in FIG. It is a figure which shows the state of the room temperature in the case of the control pattern (with unit control). Even when the number of units is controlled, the room temperature of each section on the same floor is maintained in a state suitable for the work environment.

  FIG. 7 shows the case where the air conditioners 1 to 4 for air-conditioning each section of the same floor shown in FIG. The power consumption in the case of a divided control pattern (with unit control) is shown. By controlling the number of units, it was possible to reduce power consumption by 20% compared to the case of individual control without unit control.

  FIG. 8 is a diagram showing another embodiment of the energy saving air conditioning control system of the present invention. In this embodiment, in order to further improve the degree of energy saving, the power load factor for each operating state of the air conditioner divided into the base machine and the auxiliary machine is sampled a plurality of times in the last N minutes, and data is obtained. Based on this, the energy conservation level is improved.

  The air conditioners 1 to 4 divided into the base machine 13 and the auxiliary machine 14 are controlled so as to operate in a plurality of operating states of start, restart, off, intermittent operation, high load operation, medium load operation, and low load operation. Is done. The maximum power load factor, the minimum power load factor, the average power load factor, and the number of off times for each operation state in the most recent N minutes of these air conditioners 1 to 4 are acquired by sampling a plurality of times. The number of off times is the number of times less than the rated X (%) in the last N minutes. For the most recent N minutes, it is necessary to include all the operating states, so the setting is made in consideration of the operating cycle.

  When the sampled data of each operating state at a certain time of the power load factor is close to the peak of the power load factor, it is set as (+), and when close to the trough of the power load factor, it is set as (−), and the maximum power load factor A When the power load factor is B and the number of samplings is N, SLOPE = (+) or (−) × (A−B) / N in order to determine whether the power load factor increases or decreases from a certain time. Calculate.

  As shown in FIG. 8, during high load operation, a set value H1 for the maximum power load factor, a set value H2 for the minimum power load factor, and a set value H3 for the average power load factor are set. During high-load operation, the operation of the air conditioners 1 to 4 is controlled so as to be equal to or less than the set values H1, H2, and H3.

In the medium load operation state, set values M1, M2, and M3 are set, and the operations of the air conditioners 1 to 4 are controlled so that the maximum power load rate during the medium load operation is M1 or less and M2 or more. When the minimum power load rate during the medium load operation is smaller than M3, the operation is switched to the off operation when the SLOPE described above tends to decrease according to the energy saving mode described later.

  In the low load operation, the set value L1 is set, and when the power load rate during the low load operation is equal to or less than the set value L1, the operation is switched to the off operation according to the energy saving mode described later.

  In the intermittent operation state, a set value M of the number of off times is set, and when the number of off times during the intermittent operation is smaller than the set value M, the off time is lengthened according to the energy saving mode described later.

  In the off operation state, a set value N of the number of off times that is smaller than the rated X (%) is set, and in the off operation state, when the number of off times is equal to or more than the set value N, the off time is set according to the energy saving mode described later. Lengthen.

  Based on the data of maximum power load rate, minimum power load rate, average power load rate, and number of off times for each operating state in the last N minutes shown in Fig. 8, intelligent mode, saving mode and cool biz mode are classified according to rank of energy saving degree. The mode is divided and the setting of the switching to the off operation and the length of the off time is set differently for each mode.

  In the intelligent mode, when the power load factor is less than the set value L1 during low-load operation, the operation is switched to OFF, the OFF time is increased when the OFF count is less than the set value M during intermittent operation, and the rating X ( %) Less than the set value N, control is performed to increase the off time.

  In saving mode, when the minimum power load factor during medium load operation is smaller than the set value M3, switch to off operation when SLOPE tends to decrease, and off when the power load factor is less than the set value L1 during low load operation Control is switched to operation, and the off time is lengthened when the number of off times is smaller than the set value M during intermittent operation, and the off time is lengthened when the number of off times less than the rated X (%) is greater than the set value N during off operation. do.

  In cool biz mode, when the minimum power load factor during medium load operation is smaller than the set value M3, switch to off operation when SLOPE is decreasing, and off when the power load factor is less than the set value L1 during low load operation Control is switched to operation, and the off time is lengthened when the number of off times is smaller than the set value M during intermittent operation, and the off time is lengthened when the number of off times less than the rated X (%) is greater than the set value N during off operation. do.

  By changing the length of the off time in each mode, the energy saving level for each mode is clarified.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

Explanation of symbols

  1, 2, 3, 4: Air conditioning device, 5: Control device, 6: Indoor environment sensor, 7: Outside air environment sensor, 8: Wattmeter, 9: Storage means, 10: Control pattern setting means, 12: Operation control means , 13: Base machine, 14: Auxiliary machine

Claims (3)

Arrange multiple air conditioners to air-condition each section of the same space,
Connecting the plurality of air conditioners to a control device via a network;
The control device is configured to classify and set the plurality of air conditioners into base machines and auxiliary machines based on the air conditioning load performance data that fluctuates depending on the past season, time, and amount of solar radiation for each section where the plurality of air conditioners are arranged. Comprising storage means for storing a control pattern comprising a back time and a set back temperature;
The base machine operates in the high load or medium load operation mode until the setback time is reached based on the stored control pattern, and operates in the low load operation mode or the intermittent operation mode until the setback temperature is reached after the setback time has elapsed. The auxiliary machine is operated at high load or medium load until the setback time based on the stored control pattern, and after the setback time has elapsed, the fan is operated in the air blowing operation mode, and after reaching the setback temperature, the base machine and the An energy-saving air-conditioning control system, wherein an auxiliary machine is operated in a ventilation mode for a predetermined time, and the base machine and the auxiliary machine are controlled to operate in an initial operation mode after a predetermined time has elapsed .   The power load factor for each operating state of the base machine and the auxiliary machine, that is, start, restart, high load operation, medium load operation, low load operation, intermittent operation, and off operation, in the last N minutes Data of maximum value, minimum value, average value, number of off times, current power load factor is obtained by sampling a plurality of times, and the energy saving degree in each operation state based on the comparison between the data obtained in the last N minutes and the set value The energy-saving air-conditioning system according to claim 1, wherein the air-conditioning apparatus is controlled so that the air-conditioner is further improved.   The rank of the energy saving degree is divided into a plurality of modes, and the switching to the off operation and the setting of the length of the off time are set differently depending on the operation state for each mode. Energy saving air conditioning control system.

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