JP3128043B2 - Control method of fan coil device and fan coil device - 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 of controlling a fan coil device which is a radiating terminal of a water type central cooling and heating system, and a fan coil device thereof.

[0002]

2. Description of the Related Art A fan coil unit, which is a heat radiating terminal, absorbs and radiates heat to and from room air by using cold and hot water circulated from a water type central cooling and heating system. That is,
The fan coil unit has a built-in heat exchanger (cold / hot water coil), and the cold / hot water coil is connected to the hot / cold water outgoing pipe and return pipe from the water type central cooling / heating system. Room air is circulated and supplied to the cold / hot water coil by a blower fan, and the room air that has passed through the cold / hot water coil is returned to the room as warm or cold by heat exchange.

Conventionally, control of this type of fan coil unit has been performed by a simple temperature controller. This function detects the room temperature, sets and displays the room temperature, starts and stops the fan coil unit, sets the air volume of the fan coil unit (strong / medium / weak / automatic), and controls the cooling / heating water when the fan coil unit starts and stops and at room temperature. Opening / closing of valves and automatic switching of cooling and heating by pipe temperature detection could be performed.

[0004] Therefore, for example, when the fan coil unit is operated for cooling, the two-way valve for cold and hot water is opened at the same time as the operation, the cold water is circulated and supplied to the coil for cold and hot water, and the set temperature and the detected temperature of the room are detected. In the case of the automatic control of the air volume based on the temperature difference between the two, the water volume was controlled in the case of the automatic control of the air volume in the case of the cold and hot water volume, respectively. Then, when the room temperature is lowered to a vicinity of the desired temperature by blowing out the cold air, the temperature is detected, and it is understood that the temperature difference from the set temperature has become small. Is closed, the cooling capacity is weakened, and the room temperature approaches the desired set temperature.

[0005]

In recent years, the water-type central cooling and heating system has been tending to be used together with a heat storage system (for example, a temperature stratified heat storage tank using water or the like) that can effectively use inexpensive midnight power. In such a heat storage system, efficient operation can be realized by reliably using up the stored cold and hot water (enhancing the heat exchange rate). However, in the conventional method of controlling the fan coil unit, even if the air flow or the water flow is controlled by the temperature difference between the set temperature and the detected temperature, the heat exchanger does not necessarily provide the effective heat that the cold and hot water holds. Had not completely consumed. For example, during cooling, when the indoor load is large, the return temperature of the chilled water is raised to the design value and returned to the water-based central cooling and heating system and the heat storage system, but when the indoor load is small, such as in the early morning, the return temperature of the chilled water is increased. It was not raised to the design value and was returned as used cold / hot water despite having sufficient cooling capacity. Further, in the air conditioning system, since the capacity of each device is determined at the time of the maximum load, the above-mentioned uneconomical operation state often occurs particularly in the middle period such as spring and autumn. The present invention has been made in view of the above circumstances, and a fan coil unit and a small air conditioner that can prevent uneconomical operation in which chilled / hot water not sufficiently exchanged heat is returned to a water-type central cooling / heating system or a heat storage system. An object of the present invention is to provide a control method of a fan (hereinafter, referred to as a fan coil device) and a fan coil device, and to save energy of a cooling and heating system.

[0006]

In order to achieve the above object, the present invention circulates and supplies cold and hot water to a heat exchanger and passes indoor and cold air through the heat exchanger. In the control method of the fan coil device for exchanging heat with room air, in a state where cold and hot water is supplied from the primary heat source system to the heat exchanger, the heat exchanger is connected to the heat exchanger such that the room temperature is maintained at the set temperature. Cooling and hot water return connected to the outlet side of the heat exchanger while passing air
The temperature of cold and hot water in the pipe was connected to the inlet side of the heat exchanger
The circulation of the cold / hot water between the primary heat source system and the heat exchanger is stopped until the temperature of the cold / hot water in the outgoing pipe of the cold / hot water has a predetermined temperature difference. Further, the present invention provides a heat exchanger to which a cold / hot water forward pipe and a cold / hot water return pipe for circulating cold / hot water are connected,
The cold and hot water is connected to the cold and hot water outgoing pipe and the cold and hot water return pipe.
A primary heat source system for cooling or heating, a blowing fan for passing room air through the heat exchanger, and a room temperature set
A controller for controlling the blower fan so that the temperature is maintained.
A fan coil device comprising
Attached to the hot water outgoing pipe, at the inlet of the heat exchanger
A sensor that detects the temperature of the cold and hot water and the cold and hot water return pipe
The temperature of the cold and hot water at the outlet of the heat exchanger.
The outlet temperature detection sensor to detect and the cold / hot water return pipe
A two-way valve provided for stopping the circulation of the cold and hot water;
Cold / hot water temperature detected by the outlet temperature detection sensor
And a predetermined temperature difference between the cold and hot water temperature detected by the sensor.
And a controller that controls closing of the two-way valve until
It is characterized by having .

[0007]

The control method of the fan coil device having such a configuration is described.
Then, an operation for maintaining the room temperature at the set temperature is performed.
In this case, to detect the temperature of the hot and cold water outlet temperature detecting sensor attached to the hot and cold water instead of pipe is returned to the primary heat source system from the heat exchanger, subjected to the heat exchanger from the primary heat source system
If the temperature difference between the supplied hot and cold water is small, the two-way valve is closed by the controller, and the cold and hot water with cooling and heating capacity that has not been used up is stored in the heat exchanger, and the blown air and the hot air are sufficiently heated. Will be replaced. In the fan coil device, the temperature of the cold / hot water returned from the heat exchanger to the primary heat source system is detected by the outlet temperature detection sensor, and from the detected temperature, the cooling / heating water has not yet used up. Is determined, the controller closes the two-way valve, and the cold / hot water that was to be returned from the heat exchanger is stored in the heat exchanger. On the other hand, the operation of the blower fan controlled by the controller
The room temperature will be maintained at the set temperature.
You.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for controlling a fan coil device and a fan coil device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a control system for a fan coil device according to the present invention. In this example, a fan coil unit 1 is used as a fan coil device, and a cooling / heating water coil 3 is built in the fan coil unit 1 embedded in the ceiling, and the cooling / heating water coil 3 is a water-type central cooling / heating (not shown). It is connected to a cold / hot water outgoing pipe 5 and a cold / hot water return pipe 7 from a primary heat source system such as a system or a heat storage system. The fan coil unit 1 also has a built-in blower fan 9, which blows indoor air sucked from the indoor side into the cold / hot water coil 3.
The heat is exchanged by passing the air through the room, and the indoor air that has become cold and hot air is blown back into the room. Also, this blower fan 9
For example, "strong",
The air volume is changed to “medium” and “weak”.

The fan coil unit 1 has a blower fan.
A controller 11 for controlling the operation of the fan 9 is attached.
Have been. The controller 11 can be operated by a room thermo 13 provided in the room. The room thermo 13 is provided with a room temperature detection sensor 15 for automatically switching the air volume, a room temperature display section 17, a room temperature setting section 19, and an operation switch 21. The room thermo 13 sends signals from these switches and the like to the controller 11 as information for setting the operation mode of the fan coil unit 1.

On the other hand, the controller 11 has a cold / hot water
A cooling / heating determination sensor (for example, a bimetallic sensor) 23 attached to the
3 detects the temperature of the cold / hot water outgoing pipe 5. The controller 11 is connected to an open / close control circuit of a two-way valve 25 attached to the cold / hot water return pipe 7. Supply of
Perform a stop. Further, the controller 11 includes a cold / hot water return pipe 7.
Is connected to an outlet temperature detecting sensor (for example, a thermistor) 27, and the outlet temperature detecting sensor 27 is returned to the primary heat source system through the cold / hot water return pipe 7.
Sensing the temperature of the hot and cold water to be.

The operation of the fan coil unit 1 having the control system configured as described above will be described. FIG. 2 is a time chart illustrating an operation state of the fan coil unit 1. When the indoor load is large, such as at the time of startup, the blower fan 9 is operated by the controller 11 at “strong”,
At this time, the two-way valve 25 is forcibly opened, and the operation in this state is continued until the set temperature is reached (see st. A). The magnitude of the indoor load is determined by, for example, the temperature difference between the detected indoor temperature and the set temperature at that time.
The controller 11 sends a control signal to the blower fan 9 based on the temperature difference. When the room temperature reaches the set temperature, the blower fan 9
, The operation signal of “medium” or “weak” is automatically performed.

When the amount of air blown by the blower fan 9 decreases after the room temperature reaches the set temperature, the amount of air passing through the cold / hot water coil 3 decreases. On the other hand, since the amount of cold / hot water supplied to the cold / hot water coil 3 is constant, the heat exchange rate decreases, and the cold / hot water that has not been sufficiently heat-exchanged is returned from the cold / hot water coil 3.

At this time, in the control system according to the present embodiment, the outlet temperature detecting sensor 27 attached to the cold / hot water return pipe 7 detects the temperature of the cold / hot water returned from the cold / hot water coil 3, and as a result, the inlet temperature If the temperature difference between the two is small, it is determined that sufficient heat exchange has not yet been performed, and the controller 11 performs control to close the two-way valve 25. As a result, the cold / hot water having cooling / heating capacity, which has not been used up yet, is sufficiently exchanged with the blast air by being stored in the cold / hot water coil 3. When the outlet temperature reaches the predetermined temperature, the controller 11 opens the two-way valve 25 again, supplies new cold / hot water to the cold / hot water coil 3, detects the outlet temperature again, and repeats the above operation. (See st. B).

[0014] Thus, according to the control method of the fan coil unit 1 described above, one to hot and cold water coil 3 at an outlet temperature detecting sensor 27 which is attached to the hot and cold water instead pipe 7
The controller 11 detects the temperature of the cold / hot water returned to the secondary heat source system, and when the temperature difference from the inlet temperature is small, the controller 11 determines that sufficient heat exchange has not been performed yet, and closes the two-way valve 25. As a result, the cooling / heating water having the cooling / heating capacity that is not used up is sufficiently exchanged with heat, so that the cooling / heating capacity of the circulating cooling / heating water can be sufficiently extracted, and the heat exchange rate per unit circulation amount can be increased. This allows the room
When controlling the internal temperature, it is possible to increase the temperature difference between the inlet and the outlet of the cold / hot water coil 3, and the primary heat source system
However, in the case of using a heat storage system, the heat storage capacity can be reduced, the amount of circulating water in the cold / hot water system can be reduced, and the initial cost associated with the reduction in pump capacity and pipe size, and the operating power The running cost due to the reduction can be reduced.

[0015]

As described above in detail, according to the method for controlling the fan coil device according to the present invention, the temperature of the cold / hot water at the outlet of the heat exchanger is detected, and the outlet temperature is set to a predetermined value with respect to the inlet temperature. Since the circulation of the cold and hot water was stopped until it had a temperature difference, the cold and hot water with cooling and heating capacity that had not been used up was stored in the heat exchanger and exchanged heat with the blast air sufficiently. Will be. That is, still
Cold and hot water with cooling and heating capacity that is not used up is the primary heat source
Room temperature while preventing uneconomical operation being returned to the system
The temperature can be maintained at the set temperature. As a result, the cooling / heating capacity of the circulating hot / cold water can be sufficiently drawn out, and the energy saving of the cooling / heating system can be achieved.
It will work. Further , according to the fan coil device of the present invention, the outlet temperature detecting sensor for detecting the outlet temperature of the heat exchanger is attached to the cold / hot water return pipe, and the cold / hot water temperature detected by this is set to a predetermined temperature by heat exchange. Until the controller for closing and controlling the two-way valve is provided, when it is determined that the cold / hot water returned from the heat exchanger has cooling / heating capacity not yet used, this cold / hot water is removed. It can be stored in a heat exchanger and heat exchange can be performed until the cooling and heating capacity is sufficiently extracted. As a result, it is possible to reduce the circulation water of the hot and cold water system, Po
Initial due to reduction of pump capacity and piping size
Cost, and, running costs by reducing driving power
Can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a control system of a fan coil device according to the present invention.

FIG. 2 is a time chart illustrating an operation state of the fan coil device.

[Explanation of symbols]

 Reference Signs List 1 fan coil unit 3 cold / hot water coil (heat exchanger) 5 cold / hot water forward pipe 7 cold / hot water return pipe 11 controller 25 two-way valve 27 outlet temperature detection sensor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Kato 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Norio Kuzuoka 1-2-1, Moto-Akasaka, Minato-ku, Tokyo 7 Kashima Construction Co., Ltd. (72) Akira Saito, inventor 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. 51 Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Seiki Nakamura 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. Yokohama Branch (56) References JP-A-58-69343 (JP, A) Japanese Utility Model Showa 56-34231 (JP, U) Japanese Utility Model Showa 63-82120 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 101 F24F 11/02 102

Claims (2)

(57) [Claims] 1. While circulating and supplying cold and hot water to a heat exchanger and passing indoor air through the heat exchanger,
The method of controlling a fan coil device for exchanging heat between the cold / hot water and the room air, wherein the room temperature is maintained at a set temperature while supplying the cold / hot water to the heat exchanger from the primary heat source system. While passing indoor air through the heat exchanger, the temperature of the cold and hot water in the cold and hot water return pipe connected to the outlet side of the heat exchanger is connected to the cold and hot water outlet pipe connected to the inlet side of the heat exchanger.
Control of the fan coil device, wherein the circulation of the cold / hot water between the primary heat source system and the heat exchanger is stopped until the temperature of the cold / hot water in the inside becomes a predetermined temperature difference. Method. 2. A hot and cold water cold circulating supply water往管and cold water instead heat exchanger tubes are connected, the hot and cold water往管and
Connected to a cold / hot water return pipe to cool or heat the cold / hot water
A primary heat source system, a blower fan for passing room air through the heat exchanger, and a room temperature maintained at a set temperature.
And a controller for controlling the blower fan.
In the fan coil device, attached to the outgoing pipe of the cold and hot water,
A sensor for detecting the temperature of the hot and cold water in the hot and cold water return pipe, and attached to the outlet of the heat exchanger.
Temperature sensor for detecting the temperature of cold and hot water
When provided in the cold and hot water instead tube, it is stopped by circulation of the cold and hot water
Two-way valve and cold / hot water temperature detected by the outlet temperature detection sensor
Temperature and the cold / hot water temperature detected by the sensor
A controller that controls the closing of the two-way valve until a difference is reached.
And a fan coil device comprising: