JPH09203550A - Terminal reheat air conditioning system controller - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A controller for a terminal reheat air-conditioning system capable of minimizing energy loss by minimizing the mixing loss of cold heat and hot heat while maintaining a room temperature at a set temperature for each individual room or zone. I will provide a. SOLUTION: Blower air from an air conditioner 3 equipped with a cold water coil 4, a hot water coil 5 and a blower fan 6 is blown out through a reheat coil 8 installed in each of a large number of private rooms or zones 2 to control the temperature of each private room or zone 2. In the individually controlled terminal reheat air-conditioning system, the room temperature of the large number of private rooms or zones 2 is detected, and the opening degree of the hot water valve 11 of the reheat coil 8 installed in the private room or zone of the maximum cooling load or the minimum heating load. Is set to 0 to minimize the integrated value of the opening degree of the hot water valve, and the terminal temperature is provided with a blower temperature controller 15 that controls the blower temperature from the air conditioner 3 to maintain the room temperature of the private room or zone 2 at the set temperature. Control device for heat air conditioning system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reheats cold air or hot air blown from one air conditioner by a reheat coil individually installed in each of a large number of private rooms or zones to individually reheat each private room or zone. The present invention relates to a terminal reheat air-conditioning system capable of air-conditioning by controlling temperature.

[0002]

2. Description of the Related Art There are a terminal reheat system, a VAV system, a four-tube fan coil unit system, etc. as a central heating and cooling system capable of individually controlling the temperature of a large number of private rooms and zones. In the conventional terminal reheat system, it was possible to individually control the temperature in each of a number of private rooms or zones, but there was a large amount of reheat and there was a mixing loss of cold heat and hot heat, and it was possible to actively use outside air cooling. Since it was not possible, there was room for improvement in terms of energy conservation.

On the other hand, the VAV system was capable of individually controlling the temperature in each of a large number of private rooms or zones, but despite the fact that it is more expensive than the terminal reheat system, it requires simultaneous cooling and heating. There is a problem that can not be dealt with, and the 4-tube type fan coil unit method is
In addition to being expensive, when there is a large amount of ventilation, the duct, piping, and fan coil unit must be installed on the ceiling, and there is a problem that the ceiling fits tightly.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a relatively inexpensive terminal reheat type air conditioning system in which a large number of individual rooms or zones follow loads to maintain respective room temperatures at set temperatures. It 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 that can minimize the mixing loss of cold heat and warm heat and can save energy by utilizing outside air cooling.

[0005]

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

Further, the control device for the terminal reheat air-conditioning system according to the present invention, in the above system, detects the outside air temperature, introduces the outside air into the air conditioner in accordance with the load condition of the private room or zone, and It is characterized by cooling, and when the blast temperature is higher than the outside air temperature, and when there is a request for cooling, outside air is introduced into the air conditioner to perform outside air cooling, thereby saving energy. 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 showing 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, which is divided into a large number of private rooms or zones 2 and a terminal reheat type air conditioning system is provided for cooling and heating the private rooms or zones 2. The terminal reheat type air conditioning system includes a cold water coil 4, a hot water coil 5, and a blower fan 6, and cools or heats return air to blow cold or warm air, and cool air from the air conditioner 3 or A duct 7 that blows warm air to each private room or zone 2, and is installed in each private room or zone 2, and reheats the required amount of cold air or hot air from the duct 7 to each private room or zone 2,
A reheat coil 8 for keeping the room temperature at a set temperature by following the load of each private room or zone 2.

Cold water is supplied to the cold water coil 4 of the air conditioner 3 through a cold water valve 9, and hot water is supplied to the hot water coil 5 through a hot water valve 10. In addition, the reheat coil 8 has a hot water valve 11
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 the blast temperature, and each room or zone 2 is provided with a room temperature thermostat 13 for detecting the room temperature. 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 input to the blast temperature controller 15, and the blast temperature controller 1
Reference numeral 5 controls the cold water valve 9, the hot water valve 10 and the hot water valve 11 based on these input signals to optimally control the blowing temperature of the air conditioner 3 so that the room temperature of each individual room or zone 2 follows the load individually. You can control it. In addition, the air conditioner 3 is configured to be able to cool the outside air by introducing the outside air depending on the outside air condition and the room load condition.

According to the above embodiment, however, the control of the air temperature of the air conditioner 3 and the room temperature control of each private room or zone 2 are controlled by the air temperature controller 15 according to the outside air condition and each room load condition as follows. To be done.

(1) When the blast temperature is higher than the outside air temperature This is the state of the intermediate season and the winter season, and the hot water coil 5 of the air conditioner 3 is made to flow hot water, and the reheat coil 8 is made to flow hot water. There is no mixing loss of heat and heat, and the room temperature of each private room or zone 2 is the reheat coil 8
Since it is individually controlled by the hot water valve 11, the comfort can be maintained and energy can be saved by using the outside air cooling.

That is, in this case, when all the individual chambers or zones 2 are required to be cooled, the maximum cooling load (the flow rate of the hot water is small) is set so that the integrated value of the opening degree 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 in the private room or zone 2 is set to 0, and accordingly, the ventilation temperature of the air conditioner 3 is lowered so that the room temperature can be maintained, so that the outside air cooling is controlled optimally.

Further, when all the individual rooms or zones 2 are required to be heated, the reheat coil 8 having the minimum heating load (the flow rate of the hot water is small) is set so that the integrated value of the opening degree of the hot water valve 11 of the reheat coil 8 becomes the minimum. The opening degree of the hot water valve 11 is set to 0,
Along with this, the hot water valve 10 is controlled so that the room temperature can be maintained, and the air blowing temperature of the air conditioner 3 is controlled. Further, when cooling and heating are requested at the same time, the blowing temperature of the air conditioner 3 is controlled by outside air cooling so that the opening degree of the hot water valve 11 of the reheat coil 8 in the private room or zone 2 where the cooling load is maximum becomes 0. However, by using the reheat coil 8 together, simultaneous requests for cooling and heating can be met.

(2) When the blast temperature is lower than the outside air temperature This is the state of the intermediate period and the summer, and the cold water is fed to the cold water coil 4 and the reheat coil 8 of the air conditioner 3, so that the cold heat However, it is possible to maintain comfort by controlling the room temperature of each private room or zone 2 individually while controlling the energy loss by minimizing this mixing loss. To do so.

First, when all the individual chambers or zones 2 require cooling, the cooling load (the flow rate of hot water is small) so that the integrated value of the opening degree of the hot water valve 11 of the reheat coil 8 is minimized.
Is set to 0 for the opening degree of the hot water valve 11 of the reheat coil 8 in the largest private room or zone 2 and the blower temperature of the air conditioner 3 is controlled so that the room temperature can be maintained at the set temperature in this state. Although it is basically not necessary to request heating for each individual room or zone 2, in this case, the air blowing temperature of the air conditioner 3 may be raised. Normally, the opening degree of the hot water valve 11 of the reheat coil 8 in the private room or zone 2 with the minimum heating load is set to 0, but in order to reduce the mixing loss, lowering the air blowing temperature of the air conditioner 3 is given priority.

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

As a result, it is possible to save energy by controlling the room temperature of each individual room or zone 2 individually to minimize the amount of reheat while maintaining comfort and positively utilizing the outside air cooling. The humidity control may be performed simultaneously by detecting the humidity in the representative room or zone 2 or the humidity of the return air.

[0020]

As described above, according to the control device for the terminal reheat air conditioning system of the present invention, even if the hot water valve opening of the private room or zone having the maximum cooling load or the minimum heating load is 0, 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, and the other room or zone can also be maintained at the set temperature by the action of the reheat coil. It is possible to realize a comfortable air-conditioning by controlling the air conditioner so that it keeps the set temperature by following each load. In addition, the air temperature from the air conditioner is controlled so that the integrated value of the hot water valve opening of the reheat coil is minimized to minimize the mixing loss of cold heat and warm heat, and the outdoor air cooling is performed depending on the outdoor air condition and the room load condition. Since it is used, energy can be saved.

[Brief description of drawings]

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

[Explanation of Codes] 2 Private Room or Zone 3 Air Conditioner 4 Cold Water Coil 5 Hot Water Coil 6 Blower Fan 7 Duct 8 Reheat Coil 11 Hot Water Valve 12 Blower Temperature Detector 13 Room Temperature Thermo 14 Outside Temperature Thermo 15 Blower Temperature Controller

Claims (2)

[Claims] 1. A terminal heater for blowing air from an air conditioner equipped with a cold water coil, a hot water coil and a blower fan through a reheat coil installed in each of a number of private rooms or zones to individually control the temperature of each private 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 to integrate the hot water valve opening degree. A control device for a terminal reheat air-conditioning system, comprising a blower temperature controller that minimizes the value and controls the blower temperature from the air conditioner to maintain the room temperature of the individual room or zone at a set temperature. 2. The terminal reheat air-conditioning system according to claim 1, wherein the outside air is cooled by detecting the outside air temperature and introducing the outside air into the air conditioner according to the load condition of the private room or zone. Control device.