JPH04316940A - Water heat source air conditioning method - Google Patents

Abstract

PURPOSE:To cut the peak of power consumption during water heat source air conditioning. CONSTITUTION:Air conditioning operation includes two operation modes; heat source side (primary side) operation in which the heat source water in a heat storage water tank is circulated to heat source side equipment, and load side (secondary side) operation in which the heat source water in the heat storage water tank is circulated to a group of air conditioners installed inside a building. The residual heat amount in the heat storage water tank at the operation start-up time of the day is compared with the estimated heat amount of the day required by the load side, and when the residual heat amount < the estimated heat amount, the time period of follow-up primly-side operation during secondary-side operation is allocated to a time band except the power consumption peak time band. At this time, number controls of refrigerating machines is also performed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heat source air conditioning method that minimizes the operation of heat source equipment during peak power consumption hours.

0002

[Prior Art] An air conditioning system that stores heat source water in a heat storage water tank and circulates this heat source water to a water heat source air conditioning unit installed in a building can perform heat storage operation using inexpensive late-night electricity, and can reduce internal heat generated within the building. It is widely used in building air conditioning because it can be used effectively. As the air conditioning unit, a fan coil unit, a water heat source heat pump unit, etc. are used. Refrigerators and boilers are generally used as heat source equipment, and heat pump chillers and the like are used in some cases.

0003

[Problem to be Solved by the Invention] Recently, peak cutting and peak shifting of power consumption has become a social problem, and one of the causes is air conditioning. In other words, power consumption peaks during the day when the cooling load increases rapidly. Water heat source air conditioning is an effective air conditioning method for dealing with this problem because it can store cold heat using electricity at night, but it still has a large load during the day and cannot cover this with just the amount of heat stored from electricity at night. If this is not possible, the heat source equipment is operated to store heat in the heat storage tank. In other words, in water heat source air conditioning systems, the heat source water in the heat storage water tank is treated as a primary heat source in the same way as heat source equipment, and the heat source equipment is immediately operated when the load side (secondary side) requests it.

[0004] For this reason, heat source equipment is often operated with insufficient remaining heat storage during peak power consumption times when the load increases rapidly (for example, from 12:00 to 3:00 noon in summer). Even in the operation of this heat source equipment, electricity is consumed to operate the refrigerator and the primary pump.

The present invention aims to solve this problem, and provides an air conditioning method that minimizes the operation of heat source equipment during peak power hours by appropriately managing the amount of residual heat storage during the day. do.

[0006]

[Means for Solving the Problems] The present invention provides a heat source side (primary side) operation in which heat source water in a heat storage water tank is circulated to the heat source equipment side, and a water heat source air conditioning system in which the heat source water in the heat storage water tank is placed inside a building. In an air conditioning method that performs load side (secondary side) operation where circulation is circulated to a group of units, the amount of residual heat stored in the thermal storage tank at the start of secondary side operation on that day is compared with the predicted amount of heat required by the load side on that day, The present invention is characterized in that when the amount of residual heat storage < the predicted amount of heat, the time for following the primary side operation during the secondary side operation is allocated in advance to a time period excluding the peak time period of power consumption.

[0007]

[Example] Figure 1 is a diagram illustrating a water heat source air conditioning system to which the method of the present invention is applied, in which heat source water in a heat storage water tank 1 installed in the basement of a building, etc. is distributed at various locations in the building. The heat source water is pumped up to the heat source air conditioning unit 2 by the secondary pump 3, and the unit 2 performs air conditioning using this as a heat source.The heat source water that has passed through the unit 2 is returned to the heat storage water tank 1. The unit 2 may be either a fan coil unit or a water heat source heat pump unit. On the other hand, the heat source water in the heat storage water tank 1 is sent to the heat source device by the primary side pump 4, and is heated or cooled by the heat source device. In the illustrated example, in order to cope with the cooling load,
A state in which a refrigerator 5 is used as a heat source device is shown.

In a building equipped with the equipment shown in FIG. 1, the change over time in the amount of heat of the load (cooling load) required by the building is as shown by curve A in FIG. 2. In other words, if the start time is 9 a.m., the cooling load is applied from around 7 a.m., and the air conditioning unit 2 is operated after the end time of 5 p.m. until around 7 p.m., and its calorific value peaks from about 12 p.m. to about 3 p.m. .

In FIG. 2, curve B shows the change over time in the residual heat amount of the heat source water (cold water) in the heat storage water tank 1 when the air conditioning unit (secondary side) is operated to cope with the cooling load of curve A. . When operating the refrigerator 5 at night to produce cold water and use the stored heat to cover the cooling load,
The amount of residual heat decreases with the passage of time, and disappears after 12 o'clock. For this reason, the refrigerator 5 is operated while the secondary side is in operation to produce the necessary cold water. The manner in which the primary side is operated during this secondary side operation is called chasing operation. In FIG. 2, the amount of heat supplied by this follow-up operation is shown as a hatched bar graph. This follow-up operation makes up for the lack of residual heat. This is the conventional normal operating mode. In this case, since the primary side is also operated during the peak power consumption period from 12:00 to 15:00, it is impossible to avoid the peak power consumption by the heat storage tank.

[0010] In the present invention, at the start of secondary side operation, the cooling load for the day is predicted based on the previous day's actual values and weather conditions, and if this predicted load exceeds the amount of residual heat,
The shortfall will be calculated from 12 to 16, which is the peak power consumption period.
Preferably, chase driving is assigned to a time zone outside of 12 to 15.

To describe an example in which four refrigerators 5 are installed in the equipment shown in FIG. 1, and the number of refrigerators is controlled to follow each other, the number of refrigerators to be operated and the time periods are allocated, for example, as shown in FIG. FIG. 3 shows an allocation table of predicted load - residual heat amount = predicted insufficient heat amount and the number of operating refrigerators. In other words, the predicted amount of insufficient heat is classified into 1 to 24 levels according to its magnitude, and the hours are allocated so that the number of refrigerators in operation is the least during periods other than peak power hours. If the predicted insufficient amount of heat is selected to be at level 8, the refrigerators will be operated in the number of refrigerators to which that number belongs during the time period to which a number of 8 or less is assigned.

[0012] In other words, if level 8 is selected, 2 units will be activated between 11:00 and 12:00, 2 units will be activated between 12:00 and 13:00, and 2 units will be activated between 17:00 and 13:00.
One refrigerator was operated at 18:00, one between 16:00 and 17:00, one between 9:00 and 10:00, one between 10:00 and 11:00, and one between 11:00 and 12:00 to reduce the predicted heat shortage overall. refill. In this way, the correlation between the number of operating chillers and operating time required to cover the predicted heat deficit is determined in advance, and this correlation is used to remove peak power hours so that the number of operating chillers is minimized. Allocate chase driving time.

FIG. 4 shows an example of the relationship between the temporal change B in the amount of residual heat and the amount of supplementary heat due to the chasing operation when chasing time slots are allocated according to the present invention. A is the change in cooling load over time. Compared to the case in Figure 3, it can be seen that the cooling load is handled while minimizing primary side operation during peak power hours. Therefore, the power required for primary side operation during peak power hours is reduced.

[0014] At the same time as this allocation of the follow-up operation, or separately, the follow-up operation is carried out when the amount of water circulating to the refrigerator 5 by the primary pump 4 is smaller than the amount of water circulating to the air conditioning unit by the secondary pump 3. It is best to manage the system so that it can be operated, and to minimize power consumption during follow-up operation.

[0015]

[Effects of the Invention] As described above, according to the present invention, it is possible to use nighttime power even in water heat source air conditioning equipment, and furthermore, the primary side operation during peak power consumption hours can be restricted to a minimum, so that the power consumption can be reduced to a minimum. Peak cuts and peak shifts can be effectively achieved.

[Brief explanation of drawings]

FIG. 1 is an equipment layout system diagram showing an example of water heat source air conditioning equipment to which the method of the present invention is applied.

FIG. 2 is a diagram showing the relationship between the amount of residual heat in the heat storage water tank, the change in cooling load over time, and the amount of heat supplemented by follow-up operation in a conventional method.

FIG. 3 is a diagram showing an example of an allocation table for allocating chase driving according to the present invention.

FIG. 4 is a diagram showing the relationship between the amount of residual heat in the heat storage water tank, the change in cooling load over time, and the amount of heat supplemented by follow-up operation according to the present invention.

[Explanation of symbols]

1 Heat storage water tank 2 Air conditioning unit 3 Secondary side pump 4 Primary side pump 5 Refrigerator

Claims (3)

[Claims] [Claim 1] A heat source side (primary side) operation in which the heat source water in the heat storage water tank is circulated to the heat source equipment side, and a load side in which the heat source water in the heat storage tank is circulated to a group of water heat source air conditioning units arranged in the building. In an air conditioning method that performs (secondary side) operation, the residual heat storage amount of the thermal storage tank at the start of the secondary side operation on the day and the predicted heat amount required by the load side on that day are compared, and if the remaining heat storage amount < predicted heat amount, A water heat source air conditioning method characterized in that the time for following the primary side operation during the secondary side operation is allocated in advance to a time period excluding the peak power consumption time period. [Claim 2] The heat source equipment consists of a group of multiple refrigerators, and (predicted heat amount - residual heat storage amount) = predicted insufficient heat amount at the start of operation, and the number of operating refrigerators and operating time required to cover this insufficient heat amount. 2. The water heat source air conditioning method according to claim 1, wherein a correlation is determined in advance, and this correlation is used to allocate the follow-up operation time so that the number of operating refrigerators is minimized. 3. The water heat source air conditioning method according to claim 1, wherein the follow-up operation is performed while maintaining the relationship: primary side circulating water amount < secondary side circulating water amount.