JP2891401B2 - Control method and control system for perimeter air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a perimeter air conditioner used for air conditioning of an office building or the like.

[0002]

2. Description of the Related Art In an air conditioner of an office building or the like, a perimeter zone in an office space is greatly affected by the outside world, so that a separate air conditioner is provided and controlled separately from an interior zone. As a control in such a perimeter zone, a control disclosed in, for example, JP-A-3-286944 is known.

As shown in FIG. 5, an office space is divided into a central interior zone I and a perimeter zone P on an outer wall H on the outer periphery thereof, and an interior outlet unit 52i and a perimeter outlet unit 52p are respectively provided on a ceiling S.
Is installed. The operation mode setting device 58i, the interior room temperature setting device 59i,
And an interior room temperature sensor 57i for detecting the room temperature in the interior zone. The perimeter temperature controller 56p incorporates an operation mode selection means 58p and a perimeter room temperature setting means 59p for setting the room temperature of the perimeter zone. The perimeter room temperature sensor 57p for detecting the room temperature of the perimeter zone and a correction value setting device 60p. Is connected.

The operation mode selecting means 58p of the perimeter temperature controller 56p compares the room temperature set value of the interior zone with the detected room temperature of the perimeter zone, and selects the cooling / warm operation mode in the perimeter zone. The perimeter room temperature setting means 59p reads a correction value preset in the correction value setting device 60 from the combination of the operation mode of the interior zone and the selected operation mode of the perimeter zone, and stores the correction value in the interior zone. In addition to the room temperature set value, the room temperature set value of the perimeter zone is set.

The above correction value is intended to correct the difference between the perceived temperature of the human body due to the radiant heat of the direct sunlight in the perimeter zone and the detected value of the room temperature by the room temperature sensor. It is preset by experience depending on the state and the like, and is stored in the correction value setting device 60. The interior temperature adjuster 56i and the perimeter temperature adjuster 56p are used to control the cooling air / hot air switching dampers 54i, 54p and the air volume control dampers 55i, 55p of the blowing units 52i, 52p based on the respective room temperature setting values. Control.

As a second example of the conventional control of the perimeter zone, Japanese Patent Application Laid-Open No. 2-110241 discloses an apparatus using a radiation heat detector. As shown in FIG. 6, the interior blowout unit 76i and the perimeter blowout unit 76p connected to the air conditioner 84 are provided on the ceiling S of the interior zone I and the perimeter zone P, respectively.
These are provided with air volume control dampers and the like, not shown, as in the first conventional example.
An interior room temperature sensor 78i is provided in the interior zone, and a perimeter room temperature sensor 78p and a radiant heat detector 80 for detecting radiant heat are provided in the perimeter zone.

The detected value of the room temperature sensor 78i for the interior is input to the room temperature input means 81 as temperature information, and the detected values of the room temperature sensor 78p for the perimeter and the radiant heat detector 80 are input to the sensory temperature determination input means 82. In the sensible temperature determination input means 82, the sensible temperature is determined according to the thermal environment evaluation such as the predicted average reported value and used as temperature information. The control device 83 takes in the room temperature information of the interior zone via the room temperature input means 81 and controls the amount of air blown from the interior blowout unit 76i. For the perimeter zone, the amount of air blown from the perimeter blow-out unit 76p is controlled based on the sensible temperature determined by the sensible temperature determination input means 82 as temperature information.

[0008]

However, the former first method
The conventional example has the following two problems. One is that air conditioning control cannot follow a sudden change in external load. Originally, the change in the temperature in the perimeter zone is largely caused by an external load as shown in FIG. 7 (the internal load is distinguished from the interior zone because the external load is a major factor). Therefore, if the external load of the heat quantity Q enters the perimeter zone and simultaneously releases the heat quantity -Q from the air conditioner to cancel the external load,
The temperature in the perimeter zone will be kept constant.
However, in the first conventional example, since the air temperature is used as the air conditioning control parameter, it takes time until the air temperature changes due to the incident external load, and as a result, the air conditioning control is delayed with respect to the external load.

Another point is that it is difficult to select a place where the room temperature sensor is installed in the perimeter zone. That is, it is necessary that the place where the room temperature sensor is installed satisfies such conditions that the temperature of the living area can be accurately measured, does not hinder the occupants, and the construction and maintenance are easy. However, in the perimeter zone, none of the wall surface, column surface, ceiling surface, floor surface, and window surface sufficiently satisfies this condition.
First, when the sensor is installed on the perimeter wall surface, the room temperature sensor is affected by the wall surface temperature, and the room temperature cannot be measured accurately. This is because the outer wall facing the perimeter wall is in direct contact with the outside air, so that the outside air temperature is transmitted to the indoor side perimeter wall by heat transfer of the wall material, which affects the air temperature near the wall. . This problem becomes remarkable in summer and winter when the difference between room temperature and outside temperature is large.

Considering a case where a room temperature sensor is installed on a column provided solely in a room without being in contact with an outer wall, in the perimeter zone, the temperature distribution in the horizontal direction changes greatly, and the area facing the window is large. The difference between the temperature and the area facing the pillar due to the effects of solar radiation increases. For this reason, in general, the room temperature sensor is often installed in the shadow of a pillar that does not receive solar radiation. However, it is difficult to say that the temperature of the area facing the window is accurately measured. However, in the perimeter zone, control over the area facing the window is important, but a suitable site for installing a room temperature sensor cannot be found in order to accurately measure the environmental temperature in that area.

In addition, even when the room temperature sensor is installed near the ceiling or floor of the perimeter zone, the room temperature distribution in the room is affected, and the room temperature in the living room cannot be measured accurately. This is because room air heated and cooled by an external load coming from windows and perimeter walls stays near the ceiling or floor due to the difference in specific gravity. This is also remarkable in summer and winter when the difference between the room temperature and the outside temperature is large. Further, as a matter of course, since there is a problem in terms of workability and designability, a room temperature sensor is not installed on the window glass surface.

As described above, when controlling the room temperature by using the room temperature sensor, it is difficult to accurately measure the environmental temperature in the perimeter zone due to the limited installation position of the room temperature sensor. There is such a problem that it is impossible to follow a load change that changes greatly in the perimeter zone only by control.

The second conventional example differs from the former in that a radiant heat detector 80 is used, but the sensible temperature is determined from both the detected values of the room temperature sensor 78p and the radiant heat detector 80. Therefore, there is a problem due to the installation position of the room temperature sensor as in the first conventional example. Also,
Since the detection value of the radiant heat detector is once converted to the perceived temperature, and the amount of air blown out from the perimeter blow-out unit is controlled based on the temperature, the control does not necessarily directly reflect the influence of the external load in this point as well.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and does not use a room temperature sensor having a problem due to an installation position, but accurately grasps an external load in a perimeter zone with a simple configuration to improve followability. It is an object to provide a control method and a control system for a perimeter air conditioner.

[0015]

According to the present invention, there is provided a perimeter air conditioner having an air outlet toward a perimeter zone at an outer peripheral portion in a room and performing air conditioning based on a set temperature of the room. Control method, measuring the radiant temperature of the perimeter surface on the outer wall, based on the radiant temperature and the room temperature set value, to obtain an estimated external load, based on the estimated external load heat medium The temperature set value was determined and the temperature of the heat medium was controlled.

According to a third aspect of the present invention, there is provided a control system of a perimeter air conditioner for performing air conditioning with an air outlet directed to a perimeter zone at an outer peripheral portion in a room, comprising: a room temperature setting means; A radiation temperature sensor installed on the ceiling of the perimeter surface to measure the radiation temperature of the perimeter surface, an external load estimating means for calculating an external load estimation value based on the radiation temperature and the indoor temperature set value, A heat medium temperature setting means for storing the relationship between the blast temperature set values in advance and determining the water or blast temperature set value from the external load estimated value, and a heat medium for controlling the water or blast temperature based on the heat medium temperature set value And temperature control means.

[0017]

[Action] The radiation temperature of the perimeter surface is measured, and an external load estimated value is obtained based on the radiation temperature and the room temperature set value.
Since the temperature set value of the heat medium is determined based on the external load estimated value to control the heat medium temperature, that is, the water supply or the blast temperature, the external load on the perimeter zone is directly reflected. Air-conditioning is obtained, and it follows the fluctuation of the external load well. In particular, according to the control system of the third aspect, the radiation temperature of the perimeter surface is accurately measured by the radiation temperature sensor installed on the ceiling of the perimeter zone. Is provided in advance, so that the set value of the water or air temperature can be easily obtained.

[0018]

FIG. 1 is a diagram showing the configuration of an air conditioner according to an embodiment of the present invention. The overall configuration includes a central monitoring device 1, a control device 2, and a fan coil unit 3. The fan coil unit 3 is installed below the window W on the outer wall H, and water is supplied to the coil 5 from a heat source 10 by a pipe having a pump 13. The fan coil unit 3 is provided with an electric three-way valve 14 and a water supply temperature sensor 15 in a supply pipe 11 to the coil 5.
One input port 4 is connected in the middle of the return pipe 12 from the coil 5. Reference numeral 17 denotes an expansion tank provided in the return pipe 12. The fan coil unit 3 further includes a controller 16 for controlling the electric three-way valve 14.
And a fan 4 for blowing air exchanged by the coil 5 to the perimeter zone. FIG. 1 shows a portion related to the perimeter zone, and omits the interior zone.

The central monitoring device 1 outputs an indoor temperature set value desired by an office occupant based on a signal from an indoor temperature setter 25 connected thereto, and determines whether the water supply from the heat source 10 is cold water or hot water. Outputs water temperature information. The central monitoring device 1 and the radiation temperature sensor 26 are connected to the control device 2. The radiation temperature sensor 26 is installed on the ceiling S of the perimeter zone, and measures the radiation temperature on the perimeter surface such as the outer wall H and the window W.

The control device 2 includes an external load estimating unit 21, a water supply temperature determining unit 22, and an operation mode determining unit 23. The external load estimating unit 21 calculates an external load estimated value based on the radiation temperature from the radiation temperature sensor 26 and the room temperature set value from the central monitoring device 1. Here, the radiation temperature sensor 26 installed on the ceiling surface is set to have a predetermined measurement viewing angle α, as shown in FIG. 2, and detects the average value of the radiation temperature from the perimeter surface. Has become.

The external load estimating section 21 of the control device calculates an external load estimated value as follows. The estimation formula is as follows. External load estimated value = total heat transfer coefficient x perimeter area x (T
R-TD) (1) where TD is the room temperature set value desired by the resident TR is the perimeter radiation temperature.

Although equation (1) targets only the temperature, the following equation (2) using the temperature TD 'including the average radiation temperature as well as the temperature in consideration of the occupant's sensation is used. The load can also be estimated. In this case, air conditioning more suited to the occupant's bodily sensation becomes possible. External load estimated value = total heat transfer coefficient x perimeter area x (T
R′−TD ′) (2) where TD ′ = 2 · TD−TR′TR ′: Average radiation temperature.

Further, the relationship between the water supply temperature set value and the external load is stored in the water supply temperature determination unit 22 in advance, and the water supply temperature set value is determined from the external load estimated value. The operation mode determination unit 23 determines the operation mode from the external load estimated value (cooling if positive, heating if negative). The water supply temperature set value thus determined is sent to the controller 16 as a control command, and, for example, a cold water / hot water switching command is sent to the water supply switching valve 18 according to the operation mode. Thereby, the controller 1
The control unit 6 controls the electric three-way valve 14 to mix the return water radiated by the coil 5 with the supply water of the supply pipe by a predetermined amount to adjust the water supply temperature. The switching of the cooling / heating operation of the electric three-way valve is performed based on the water temperature information of the heat source.

As described above, in this embodiment, the water supply temperature set value is determined on the basis of the measured value of the radiation temperature from the perimeter surface, so that the air conditioning directly reflecting the external load on the perimeter zone. Thus, the problem of uncertain load determination due to the installation position of the room temperature sensor can be solved, and the effect of significantly improving the ability to follow changes in the external load can be obtained.

In the illustrated embodiment, the fan coil unit has one coil. However, the present invention can be applied to a fan coil unit having a plurality of coils, and a plurality of fan coil units can be provided for each perimeter zone. Is installed, the fan coil unit may be similarly controlled. In addition, the rotation speed of the fan and the like can be appropriately controlled with respect to the amount of blown air in the fan coil unit.

FIG. 3 shows the configuration of a second embodiment to which the present invention is applied. Air controlled to a predetermined temperature by the air conditioner main body 33 is blown out at a constant air volume from a blowout port 36 provided on the ceiling S of the perimeter zone. In the air conditioner main body 33, cold water and hot water from the heat source 40 are supplied to the cold water coil 35a and the hot water coil 35b, respectively.
The temperature is adjusted by the electric two-way valves 37a, 37b provided in the a, 38b, and the temperature of air exchanged with the coils 35a, 35b, that is, the blowing temperature is controlled. The air conditioner main body 33 supplies the air heat-exchanged by the coil to the outlet 36.
A fan 34 for blowing air to the fan is provided, and a blowing temperature sensor 45 is provided at a blowing outlet.

Further, a controller 46 is provided, and a measured value from the blast temperature sensor 45 and a control device 32 described later are provided.
The two-way electric valve 37a,
37b is controlled. On the other hand, on the ceiling S of the perimeter zone, a radiation temperature sensor 26 for measuring the radiation temperature of the perimeter surface is installed as in the first embodiment. The central monitoring device 31 outputs a room temperature set value desired by the office occupant based on a signal from the room temperature setter 25 connected thereto. The central monitoring device 31 and the radiation temperature sensor 26 are connected to the control device 32.

The control device 32 includes an external load estimating unit 21 and a blast temperature determining unit 42. The external load estimating unit 21 calculates the radiation temperature from the radiation temperature sensor 26 and the central monitoring device 31
The estimated external load value is calculated based on the indoor temperature set value from the same manner as in the previous embodiment. The relationship between the set value of the blast temperature and the external load is stored in the blast temperature determining unit 42 in advance, and the set value of the blast temperature is determined from the estimated external load value. The air temperature setting value thus determined is sent to the controller 46 as a control command. As a result, the controller 46 compares the current blast temperature with the blast temperature set value, and controls the electric two-way valves 37a and 3a so that the blast temperature at the blast outlet becomes the blast temperature set value.
7b.

Next, FIG. 4 shows the relationship between the indoor environment of the building and the external environment measured by the present embodiment. (A) of the figure,
(B), (c) are measurements of three directions from south to east and north of the building in order from Sunday to Tuesday. The blinds of the south and north windows are open, and only the east side is closed. The external environment referred to here is an external load estimated value calculated from an external temperature measured by a thermometer and a radiation thermometer installed on the roof of a building, respectively, and the amount of solar radiation. The reason for using the external load estimated value is to facilitate comparison with the present embodiment. From this experimental data, on Sunday when air conditioning was stopped, the peaks of solar radiation and radiant temperature coincided in the south and east, where the influence of solar radiation was large, and the radiant temperature on the north side, where the influence of solar radiation was small, was affected by outside air It can be seen that it has changed.

On the other hand, on weekdays when work is performed, the radiation temperature is different from the above, and the radiation temperature is affected not only by the external conditions but also by the internal heat generation and the room temperature due to air conditioning. The effects are suppressed. On the north side, the load obtained from the radiation temperature is higher due to the higher room temperature. On the east side, it can be seen that the use of blinds has reduced the morning sunlight load. From these circumstances, according to the present embodiment, the estimation of the external load can be obtained with high accuracy as a comprehensive result including not only the influence from the external environment but also the influence of the indoor environment such as blinds and room temperature.

This embodiment is configured as described above, and determines the blast temperature set value based on the measured value of the radiation temperature from the perimeter surface, as in the previous embodiment. Is directly reflected, and the effect that the ability to follow the fluctuation of the external load is remarkably improved is obtained.

In the second embodiment, the main body of the air conditioner is provided with the cold water coil and the hot water coil to which the cold water and the hot water are respectively supplied. However, the present invention is not limited to this. When a coil is provided, it is only necessary to switch between cold water and hot water in accordance with a command from the control device as in the first embodiment. Further, here, the air blowing temperature is controlled in the constant air volume method, but it is also possible to make the air blowing temperature constant and control the air volume based on the estimated external load value.

[0033]

As described above, the present invention relates to a method for controlling a perimeter air conditioner for performing air conditioning based on a set indoor temperature, measuring a radiant temperature of a perimeter surface and based on the measured radiant temperature and the set indoor temperature. Since the external load estimated value is obtained, the heat medium temperature set value is determined based on the external load estimated value, and the water supply and the blast temperature are controlled.
The air conditioning in which the external load on the perimeter zone is directly reflected is obtained, and the effect of improving the followability to the fluctuation of the external load is obtained. This eliminates the uncertainty of using a room temperature sensor, whose measured value fluctuates depending on the installation position, as in the case of constant room temperature control, and provides a resident's comfortable environment in a perimeter zone with large load fluctuations. Is done. Further, since the radiation temperature sensor is used, it is possible to mount the apparatus on the ceiling without being affected by the temperature distribution, and there is an advantage that it does not hinder the occupants.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an installation example of a radiation temperature sensor.

FIG. 3 is a diagram showing a second embodiment.

FIG. 4 is a diagram showing a comparison between estimation of an external load based on radiation temperature and estimation by a conventional example.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a diagram showing another conventional example.

FIG. 7 is an explanatory view showing the principle of air conditioning of the perimeter.

[Explanation of symbols]

 1, 31 Central monitoring device 2, 32 Control device 3 Fan coil unit 4 Fan 5 Coil 10, 40 Heat source 11 Supply piping 12 Return piping 13 Pump 14 Electric three-way valve 15 Water supply temperature sensor 16, 46 Controller 17 Expansion tank 18 Water supply switching Valve 21 External load estimation unit 22 Water supply temperature determination unit 23 Operation mode determination unit 25 Indoor temperature setting unit 26 Radiation temperature sensor 33 Air conditioner body 34 Fan 35a Cold water coil 35b Hot water coil 36 Blow-out port 37a, 37b Electric two-way valve 38a, 38b Piping 42 Ventilation temperature determination unit 45 Ventilation temperature sensor 52i, 76i Interior blowout unit 52p, 76p Perimeter blowout unit 54i, 54p Switching damper 55i, 55p Air flow control damper 56i Interior temperature controller 56p Perimey Temperature controller 57i, 78i Room temperature sensor for interior 57p, 78p Room temperature sensor for perimeter 58i Operation mode setting device 58p Operation mode selection means 59i Room temperature setting device for interior 59p Room temperature setting device for perimeter 60 Correction value setting device 80 Radiant heat detector 81 Room temperature input means 82 Perceived temperature determination input means 83 Control device

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-110241 (JP, A) JP-A-61-213543 (JP, A) JP-A-7-110155 (JP, A) JP-A 53-110 70536 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F24F 11/02

Claims (3)

(57) [Claims] 1. A method for controlling a perimeter air conditioner having an outlet directed to a perimeter zone at an outer peripheral portion in a room and performing air conditioning based on a room temperature set value, wherein a radiation temperature of a perimeter surface is measured on an outer wall. Measuring, determining an external load estimated value based on the radiation temperature and the indoor temperature set value, determining a heat medium temperature set value based on the external load estimated value, and controlling the heat medium temperature. A method for controlling a perimeter air conditioner. 2. The method for controlling a perimeter air conditioner according to claim 1, wherein the perimeter air conditioner includes a fan coil unit, and the heat medium is water supply to a coil of the fan coil unit. 3. A control system for a perimeter air conditioner for performing air conditioning with an air outlet toward a perimeter zone at an outer peripheral portion in a room, comprising a room temperature setting means and a perimeter installed on a ceiling of the perimeter zone and mounted on an outer wall. A radiation temperature sensor for measuring the radiation temperature of the surface, an external load estimating means for calculating an external load estimation value based on the radiation temperature and the indoor temperature set value, and a relationship between the water supply or the blast temperature set value for the external load being determined in advance. Heat medium temperature setting means that is stored and determines a water or air temperature set value from the external load estimated value, and has a heat medium temperature control means that controls water or air temperature based on the heat medium temperature set value. Characteristic perimeter air conditioner control system.