JPH0229530A - Reduction and control method for mixing loss in air conditioning system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention sets temperature settings separately for a perimeter area, which is the outer periphery of the room, and an interior area, which is the core part of the room. The present invention relates to a mixing loss reduction control method in an air conditioning system that controls the air conditioning of each area based on the set temperature of each area (the set temperature may be the same for each area).

[Conventional technology]

In recent years, in medium-sized or larger office buildings, air conditioning equipment has been systemized due to the systemization of architecture. In many cases, air conditioning systems are used in which temperature settings are determined individually for certain interior areas and air conditioning is controlled for each area based on these temperature settings. for example,
A fan coil unit will be used in the perimeter area, and a regular ceiling air outlet will be used in the interior area.

In this case, in the winter, heat transfer loss from the outer wall of the building, window glass, etc. is large in the perimeter area, so hot air is supplied from the fan coil unit and the measured temperature in the perimeter area is set to the set temperature (θ,). bring it closer to That is, based on a predetermined set temperature θ, heating control is performed in the perimeter area so that the measured temperature matches the set temperature θr.On the other hand, in the interior area continuous to the perimeter area, indoor lighting and occupants are controlled. Since there is heat generated indoors by office equipment and the like, and cold heat supply is required even in winter, cold air is supplied from the ceiling outlet to bring the measured temperature in the interior area closer to the set temperature (θ summer).

That is, based on a predetermined set temperature θ1, the interior area is cooled and controlled so that the measured temperature matches the set temperature θ1.

[Problem to be solved by the invention]

However, according to such an air conditioning system,
Mixing of the airflow or air occurs between the perimeter area and the interior area, and the supplied cold and hot heat interfere with each other, increasing the heat load in both areas, resulting in a mixing heat loss (mixing loss) of the indoor air. However, more cold and hot air than necessary was supplied, and energy was wasted.

In other words, the warm air from the fan coil unit when heating the perimeter area increases the measured temperature in the interior area, while the cold air from the ceiling outlet when controlling the interior area to cool decreases the measured temperature in the perimeter area. As a result, heating in the perimeter area and cooling in the interior area are increased, resulting in reflected energy, deteriorating the indoor environment, and increasing discomfort.

[Means to solve the problem]

The present invention has been made to solve these problems, and is designed to lower the set temperature for heating control in the perimeter area when controlling air conditioning in the interior area.

[Effect]

Therefore, according to the present invention, when performing cooling control in the interior area, the set temperature for heating control in the perimeter area is lowered.

〔Example〕

Hereinafter, a mixing loss reduction control method in an air conditioning system according to the present invention will be explained in detail.

FIG. 4 is a plan view showing an air conditioning system to which this mixing loss reduction control method is applied.

In the figure, P is the perimeter area that is the outer periphery of the room 1, ■ is the interior area that is the core of the room 1, 2 is the fan coil unit arranged in the perimeter area, 3 is the window glass, and 4 is the ceiling air outlet , 5 is an air supply duct forming an air supply passage to the ceiling outlet 4, T is a temperature sensor that measures the indoor temperature in the range meter area P, and TI is a temperature sensor that measures the indoor temperature in the interior area (2).

The set temperature θ in the perimeter region P and the set temperature θ1 in the interior region I are given by a higher-level control system. That is,
Heating control in the perimeter area P is performed by supplying hot air from the fan coil unit 2 so that the temperature θ7I- measured by the temperature sensor TP matches the set temperature θ, based on the set temperature θ given from the higher level. be exposed.

Also, based on the set temperature θ1 given from the upper level, the cooling control or heating control in the interior area ■ blows cold or warm air from the ceiling outlet 4 so that the temperature θT1 measured by the temperature sensor TT matches the set temperature θ. This is done by supplying.

FIG. 5 shows an air conditioner that supplies air to the air supply duct 5,
Cooling coil CC1 to which cooling water is supplied via the cold water valve 6
It is composed of a heating coil HC1 to which hot water is supplied via a hot water valve 7, and a fan F that blows out air to the air supply duct 5. That is, when performing cooling control for the interior area (■), close the hot water valve 7 and open the cold water valve 6 (or open the outside air damper 9 for performing outside air cooling), and when performing heating control, open the cold water valve 6. (or close the outside air damper 9) and open the hot water valve 7.

Next, a mixing loss reduction control method in the air conditioning system configured as described above will be explained.

First, before going into the specific explanation, the basic idea of this mixing loss reduction control method will be explained. That is, a mixing loss of indoor air between the perimeter region P and the interior region (2) can occur when heating control is performed in the perimeter region P when cooling is controlled in the interior region (2). That is, while the warm air from the fan coil unit 2 when controlling the heating of the perimeter area P increases the measured temperature θT+ in the interior area I, the cold air from the ceiling outlet 4 when controlling the cooling of the interior area Area P
Measured temperature θ7. Heating in the perimeter area P and interior area in order to lower the! Air conditioning will be increased. Here, if the set temperature θ in the perimeter region P is forcibly lowered (set back), the measured temperature θ1. Excessive heating control due to the lowering of the temperature is suppressed, and an increase in heating in the perimeter region P is suppressed. Then, when the increase in heating in this perimeter region P is suppressed, the measured temperature θ1. As a result, the increase in air conditioning in the interior area 1 is also suppressed. In other words, if the set temperature θ in the perimeter region P is set back during cooling control in the interior region yiI, increases in heat loads in the perimeter region P and interior region Mixing loss is reduced, energy saving effects are increased, indoor environment deterioration is prevented, and comfort is increased.

Figure 1 shows a specific example of this mixing loss reduction control method (Example 1).
), and first, in step 101, it is determined whether the current season is winter. In other words, the perimeter area P and the interior area ■
The mixing loss of room air with the room air cannot occur unless heating control is performed in the perimeter region P. In other words, the conditions for heating control in the perimeter region P are limited to the winter season, and there is no need to set the set temperature θ in the perimeter region P outside the winter season. If it is determined in step 101 that the current season is winter, it is determined that heating control is to be performed in the perimeter area P, and step 1
Proceed to step 02 and check the opening degree (valve opening value) of the hot water valve 7. If it is determined in this step 102 that the valve opening value of the hot water valve 7 is zero, it is determined that cooling control is to be performed for the interior area I, and the constant value (θa) is set to 2°C in step 103. The process then proceeds to step 104, where the set temperature θ in the perimeter area P is set to this θa. That is, the setback is performed to create a new set temperature θF (θ.

= θ, −θa), and heating control in the perimeter region P is performed based on the set temperature θP obtained by centback.

Note that if it is determined in step 101 that the current season is not winter, and if it is determined in step 102 that the valve opening value of the hot water valve 7 is not zero (that is, the air conditioner is not cooled in the interior area I), If it is determined that no control is to be performed), it is determined that a mixing loss of indoor air cannot occur, and the setback of the set temperature θP is not performed.

FIG. 2 is a control flowchart showing another embodiment (Embodiment 2) of this mixing loss reduction control method.

In this embodiment, the supply air temperature T from the air conditioner 8 to the interior area I is detected (step 202).
Based on this supply air temperature T, a set value change value θb corresponding to the above constant value θa according to the degree of cooling control of the interior area I is determined by a set value change value-supply air temperature characteristic table A as shown in FIG. (Step 203). That is, until the supply air temperature T exceeds the predetermined temperature Ta, the set value change value θb is set to 2°C, and after the supply air temperature T exceeds the predetermined temperature Ta, the set value change value θb is set to a predetermined slope. The angle is gradually decreased until it reaches 0°C. Then, the set temperature θ in the perimeter area P is set back using this derived set value change value θb, and a new set temperature θ2 (θ, = 02−θb) is obtained (step 204). Heating control in the perimeter region P is performed based on the set temperature θP obtained by setback.

The table below shows the perimeter area and interior area.

Application examples of the above embodiments 1 and 2 will be shown depending on the type of air conditioner.

In addition, in the table below, a VAV air conditioner is an air conditioner equipped with a variable supply air amount adjustment unit, and in this example,
A variable supply air amount adjustment unit is arranged in the ceiling air outlet 4, and the damper opening degree of this unit is adjusted according to the set temperature θ of the interior area I.
1, the amount of air supplied to the interior area I is controlled according to the measured temperature θa. FIG. 6 shows a schematic diagram of the system configuration. In the same figure, 1
0 is an air conditioner, 11 is an air supply duct, 12-1 to 12-n are variable supply air volume adjustment units l- (VAV units) arranged corresponding to the interior areas of each room, and 13-1 to 13-
n is a fan coil unit arranged corresponding to the perimeter area of each room, and 14-1 to 14-n are VAV unit controllers (custom DDCs) provided corresponding to ■AV units 12-1 to 12-n. ), 15-1~15
-n is fan coil unit (FCU) 13-1 to 1
3-n is a unit controller for FCU (custom DDC>), 16 is a local controller (general-purpose DDC).The operation of the air conditioner 10 is controlled based on the local controller 16, and the interior area of each room is The set temperature in the perimeter area is determined by the unit controller 1 for each VAV via the controller bus 17 via the MC that communicates with the central management system.
4-1 to 14-n and FCU unit controllers 15-1 to 15-n.

〔Effect of the invention〕

As explained above, according to the mixing loss reduction control method in an air conditioning system according to the present invention, the set temperature of the heating control in the perimeter area is lowered when controlling the air conditioning in the interior area, so that there is mutual interference between the perimeter area and the interior area. The increase in heat load caused by the above is mutually suppressed, the mixing loss of indoor air is reduced, the energy saving effect is enhanced, the deterioration of the indoor environment is prevented, and the comfort is increased.

[Brief explanation of the drawing]

FIG. 1 is a control flowchart showing an embodiment of the mixing loss reduction control method in an air conditioning system according to the present invention;
FIG. 2 is a control flowchart showing another embodiment of this mixing loss reduction control method, FIG. 3 is a diagram showing a set value change value-supply air temperature characteristic table used when executing this control flowchart, and FIG. 5 is a plan view showing an air conditioning system to which this mixing loss reduction control method is applied, FIG. 5 is a schematic configuration diagram showing an air conditioner that supplies air to the air supply duct in this air conditioning system, and FIG. 1 is a schematic system configuration diagram of an air conditioning system using a VAV air conditioner in its interior area. P... Perimeter area, ■... Interior area, 1
...Indoor, 2...Fan coil unit, 4...
Ceiling outlet, 5...Air supply duct, 6...Cold water valve, 7
...Hot water valve, 8...Air conditioner, 9...Outside air damper.

Claims (1)

[Claims] In an air conditioning system in which set temperatures are determined separately for a perimeter area, which is the outer periphery of the room, and an interior area, which is the core part of the room, and air conditioning control is performed in each area based on these set temperatures, the above-mentioned 1. A mixing loss reduction control method in an air conditioning system, characterized in that the set temperature of heating control in a perimeter area is lowered.