JP3073684B2 - Control device for terminal reheat air conditioning system - 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 reheating cold air or hot air blown from one air conditioner by means of a reheat coil installed in each of a number of individual rooms or zones. The present invention relates to a terminal reheat air-conditioning system capable of performing air-conditioning by controlling the temperature.

[0002]

2. Description of the Related Art As a centralized cooling and heating system capable of individually controlling the temperature of a large number of individual rooms and zones for air conditioning, there are a terminal reheat system, a VAV system and a four-tube fan coil unit system. In the conventional terminal reheat method, the temperature could be individually controlled for each of a large number of individual rooms or zones.However, the amount of reheat was large, there was a mixing loss of cooling and heating, and the outside air cooling could be actively used. Because there was no room for improvement, there was room for improvement in terms of energy conservation.

On the other hand, in the VAV system, it is possible to individually control the temperature for each of a large number of private rooms or zones. However, although it is more expensive than the terminal reheat system, simultaneous cooling and heating are required. Has a problem that cannot be dealt with, and the four-tube fan coil unit method
When it is expensive and has a large amount of ventilation, the ducts and pipes and the fan coil unit must be installed on the ceiling, so that there is a problem that the ceiling fit is severe.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a relatively inexpensive terminal reheating type air conditioning system, which keeps the room temperature at a set temperature by following a load in each of a large number of private rooms or zones. An object of the present invention is to provide a control device for a terminal reheat air-conditioning system capable of realizing comfortable air-conditioning. Another object of the present invention is to provide a control device for a terminal reheat air-conditioning system capable of minimizing a mixing loss of cold heat and warm heat and saving energy by using outside air cooling.

[0005]

In order to solve the above-mentioned problems, a control device for a terminal reheat air-conditioning system according to the present invention comprises: a large amount of air blown from an air conditioner having a cold water coil, a hot water coil and a blower fan. In a terminal reheat air-conditioning system that blows out through a reheat coil installed for each individual room or zone and individually controls the temperature of each individual room or zone, the room temperature of the multiple individual rooms or zones is detected, and the maximum cooling load or the minimum heating load is detected. The opening of the hot water valve of the reheat coil installed in the private room or zone is set to 0 and the integrated value of the opening of the hot water valve is minimized, and the room temperature of the private room or zone is controlled by the air temperature from the air conditioner. It is equipped with an air temperature controller that maintains the set temperature by setting the maximum cooling load or the minimum By minimizing the integrated value of the hot water valve opening by setting the hot water valve opening of the reheat coil of the load private room or zone to 0, the mixing room is minimized and the room temperature of the private room or zone is controlled by the air temperature from the air conditioner. It can be controlled to the set temperature.

The control device for a terminal reheat air conditioning system according to the present invention, in the above system, detects an outside air temperature and introduces outside air into the air conditioner according to a load condition of the private room or zone. It is characterized by performing cooling, and when the blowing temperature is higher than the outside air temperature, when there is a request for cooling, energy is saved by introducing outside air to the air conditioner and performing outside air cooling be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
It will be described based on. FIG. 1 is a configuration diagram illustrating a configuration of a control device of a terminal reheat air-conditioning system according to an embodiment of the present invention.

Reference numeral 1 denotes a building, the inside of which is divided into a large number of private rooms or zones 2, and an air conditioning system of a terminal reheat system is provided for cooling and heating the private rooms or zone 2. The air conditioning system of the terminal reheat method includes a cold water coil 4, a hot water coil 5, and a blower fan 6, and cools or heats return air and blows it as cold air or hot air. A duct 7 for blowing hot air to each private room or zone 2, and a duct 7 installed in each private room or zone 2 to reheat cold or hot air from the duct 7 by a required amount and blow it out to each private room or zone 2,
And a reheat coil 8 for keeping the room temperature at the set temperature following the load of each individual room or zone 2.

The cold water coil 4 of the air conditioner 3 is supplied with cold water through a cold water valve 9, and the hot water coil 5 is supplied with hot water through a hot water valve 10. The reheat coil 8 has a hot water valve 11
The hot water is supplied via the.

On the other hand, the duct 7 connected to the air conditioner 3
Is provided with a blast temperature detector 12 for detecting a blast temperature, and a room temperature thermo 13 for detecting a room temperature is provided in each of the individual rooms or zones 2, and an outside temperature for detecting an outside temperature is provided outside the room. An outside temperature thermo 14 is provided.

The detection signals of the temperature detector 12, the room temperature thermostat 13 and the external temperature thermostat 14 are inputted to an air temperature controller 15, and the air temperature controller 1
5 controls the cold water valve 9, the hot water valve 10 and the hot water valve 11 based on these input signals, controls the air temperature of the air conditioner 3 optimally, and adjusts the room temperature of each individual room or zone 2 to the load and individually. Can be controlled. In addition, the air conditioner 3 is configured to introduce outside air and cool the outside air according to the outside air condition and the room load condition.

Thus, according to the above-described embodiment, the control of the blast temperature of the air conditioner 3 and the control of the room temperature of each individual room or zone 2 are performed through the blast temperature controller 15 according to the outside air condition and each room load condition as follows. Done in

(1) In the case where the air blowing temperature is higher than the outside air temperature This is an intermediate period and a winter period, in which hot water flows through the hot water coil 5 of the air conditioner 3 and hot water flows through the reheat coil 8, so that the cooling There is no mixing loss of heat and heat, and the room temperature of each individual room or zone 2 is controlled by the reheat coil 8.
Is individually controlled by the hot water valve 11, so that comfort can be maintained and energy can be saved by using outside air cooling.

That is, in this case, when all the individual rooms or zones 2 require cooling, the maximum cooling load (the flow rate of the hot water is small) so that the integrated value of the opening of the hot water valve 11 of the reheat coil 8 becomes the minimum. The opening degree of the hot water valve 11 of the reheat coil 8 of the private room or zone 2 is set to 0, and accordingly, the air temperature of the air conditioner 3 is controlled so as to maintain the room temperature.

When all the individual rooms or zones 2 require heating, the reheat coil 8 with the minimum heating load (the flow rate of the hot water is small) is set so that the integrated value of the opening of the hot water valve 11 of the reheat coil 8 is minimized. The opening of the hot water valve 11 is set to 0,
Accordingly, the hot water valve 10 is controlled so that the room temperature can be maintained, thereby controlling the blast temperature of the air conditioner 3. Further, when cooling and heating are requested at the same time, the blast temperature of the air conditioner 3 is controlled by outside air cooling so that the opening of the hot water valve 11 of the reheat coil 8 in the private room or zone 2 with the maximum cooling load becomes zero. By using the reheat coil 8 together, it is possible to cope with simultaneous requests for cooling and heating.

(2) When the temperature of the blown air is lower than the outside air temperature This is a state in the intermediate period and the summer period, in which cold water flows through the cold water coil 4 of the air conditioner 3 and hot water flows through the reheat coil 8, so And mixing loss of heat and heat will occur. However, while controlling the mixing loss to minimize the energy saving, the comfort can be maintained by controlling the room temperature of each individual room or zone 2 individually. To do.

First, when all the individual rooms or zones 2 require cooling, the cooling load (the flow rate of the hot water is small) so that the integrated value of the opening of the hot water valve 11 of the reheat coil 8 is minimized.
Sets the opening of the hot water valve 11 of the reheat coil 8 of the largest private room or zone 2 to 0, and controls the air blowing temperature of the air conditioner 3 so that the room temperature can be maintained at the set temperature in this state. In addition, although it is basically not required that all the individual rooms or the zones 2 require heating, in this case, the air temperature of the air conditioner 3 may be increased. Normally, the opening of the hot water valve 11 of the reheating coil 8 in the private room or zone 2 with the minimum heating load is set to 0, but priority is given to lowering the air temperature of the air conditioner 3 in order to reduce the mixing loss.

Further, when cooling and heating are requested at the same time, the blast temperature of the air conditioner 3 is controlled such that the opening of the hot water valve 11 of the reheat coil 8 in the private room or zone 2 where the cooling load is the maximum becomes zero. . In this case, too, priority is given to lowering the blast temperature of the air conditioner 3 in order to reduce the mixing loss.

Thus, the amount of reheat can be minimized while maintaining comfort by individually controlling the room temperature of each individual room or zone 2, and energy saving can be achieved by positively utilizing outside air cooling. The humidity control may be performed simultaneously by detecting the humidity of the representative room or zone 2 or the humidity of the return air.

[0020]

As described above, according to the control device of the terminal reheat air conditioning system according to the present invention, even if the hot water valve opening of a private room or zone with a maximum cooling load or a minimum heating load is set to 0, the air conditioner The room temperature of the individual room or zone can be maintained at the set temperature by controlling the temperature of the air blown from the other room, and the other room or zone can be maintained at the set temperature by the action of the reheat coil. Is controlled so as to follow the respective loads and to maintain the set temperature, so that comfortable air conditioning can be realized. In addition, the air temperature from the air conditioner is controlled so that the integrated value of the opening of the hot water valve of the reheat coil is minimized to minimize the mixing loss of cold and hot heat, and the outside air cooling is controlled by the outside air condition and room load condition. Since it is used, energy saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a configuration of a control device of a terminal reheat air-conditioning system according to an embodiment of the present invention.

[Explanation of symbols]

 2 Private room or zone 3 Air conditioner 4 Cold water coil 5 Hot water coil 6 Ventilation fan 7 Duct 8 Reheat coil 11 Hot water valve 12 Ventilation temperature detector 13 Room temperature thermo 14 Outside temperature thermo 15 Ventilation temperature controller

Claims (2)

(57) [Claims] An air conditioner provided with a cold water coil, a hot water coil and a blower fan blows air blown through reheat coils installed in a large number of individual rooms or zones to individually control the temperature of each individual room or zone. In the heat air conditioning system, the room temperature of the large number of private rooms or zones is detected, and the opening of the hot water valve of the reheat coil installed in the private room or zone of the maximum cooling load or the minimum heating load is set to 0 and the integration of the hot water valve opening is performed. A control device for a terminal reheat air-conditioning system, comprising: a blower temperature controller that minimizes a value and maintains a room temperature of the private room or zone at a set temperature by controlling a blown temperature from the air conditioner. 2. The terminal reheat air-conditioning system according to claim 1, wherein an outside air temperature is detected, and outside air is introduced into the air conditioner in accordance with a load condition of the private room or zone to perform outside air cooling. Control device.