JP2937304B2 - Duct 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 the introduction of outside air or room air through a duct into a single coil unit having a built-in coil for both hot and cold water (heat exchanger) in which a heat medium circulates.
The present invention relates to a duct type air conditioning system configured to perform cooling or heating by blowing air cooled or heated by the coil unit from a step-controlled fan unit installed in each room via a duct.

[0002]

2. Description of the Related Art A conventional duct type air conditioning system is shown in FIG.

Reference numeral 1 denotes a heat medium discharge pipe in the main pipe, 2 denotes a heat medium return pipe in the main pipe, 3 denotes a branch heat medium return pipe, 4 denotes a branch heat medium return pipe, and 5 denotes a coil unit. The unit 5 has a built-in coil for both hot and cold water (heat exchanger) 6.

[0004] 7 is a step control type fan unit installed in each room, 8 is a fan, 9 is a fan unit 7
, The rotation of the fan 8 is switched to three stages of strong, medium and weak to perform room temperature control.

[0005] Reference numeral 10 denotes a control valve with an actuator 11 inserted into the branch heat medium delivery pipe 3, and reference numeral 12 denotes a valve controller.
The control valve 10 is controlled based on a signal (load) from the air temperature sensor 13 on the outlet side of the coil unit 5.
By controlling the opening of the coil 6, the amount of the heat medium circulating in the coil 6 is adjusted to control the blow temperature to be constant. In the figure, reference numeral 14 denotes a duct connecting between the coil unit 5 and the fan unit 7.

[0006]

However, the conventional duct type air conditioning system has the following problems.

A. In the case of heating, the valve controller 12 opens the control valve 10 to increase the amount of the heat medium when the temperature input from the sensor 13 is lower than the set value, and narrows the control valve 10 when the temperature is higher than the set value. Although the blower temperature is controlled by decreasing the amount, the set temperature is obtained from the time lag caused by the heat retained in the coil 6 itself, the sensitivity of the sensor 13 and the responsiveness of the actuator 11, and the like.
1 hunts. Therefore, the control valve 1
0 and the durability of the actuator 11 and the like are adversely affected.

B. When there are a plurality of fan units 7, it is necessary to set a large cooling / heating capacity range. For this reason, the actuator 11 and the valve controller 12 are complicated, and the control valve 10 is enlarged.

C. Since the coil unit 5 is normally designed for cooling, the heating capacity during heating is too high. For this reason, the control system becomes complicated, and it is difficult to perform comfortable air conditioning during heating.

It is an object of the present invention to provide a duct type air conditioning system which does not have the above-mentioned problems a to c.

[0011]

The configuration of the present invention proposed to solve the above problems is as follows.

A. Outside air or room air is introduced into a single coil unit having a built-in coil for both hot and cold water through which a heat medium circulates, through a duct, and air cooled or heated by this coil unit is passed through the duct to each of the units. A duct-type air-conditioning system configured to perform cooling or heating by blowing out from a step-controlled fan unit installed in a room; b. An airflow signal transmitter is mounted on the fan unit; c. A heat medium temperature detection sensor is attached to a part of the heat medium flow pipe in the main pipe; d. Inserting a control valve with an actuator on the inlet or outlet side of the coil unit; e. When the heating medium temperature input from the heating medium temperature detection sensor is within a preset heating temperature range, a throttle signal is output to the actuator to set the control valve opening to the heating mode, and this setting is performed. In this state, when the cooling temperature range is detected, the air conditioner is switched to the cooling mode, and as the total airflow value input from the airflow signal transmitter increases, the amount of the heat medium circulating in the coil unit increases, and the total airflow decreases. A valve controller for outputting a control signal to the actuator of the control valve so as to reduce the amount of the heat medium as the operation proceeds; f. A duct type air conditioning system characterized by the following.

In the above configuration, the temperature of the heat medium circulating in the heat medium flow pipe of the main pipe is detected by the heat medium temperature detection sensor, and one of the cooling and heating operation modes is determined by the valve controller. Is controlled (set), for example, by detecting the temperature of the room in which the fan unit is installed by an indoor temperature detection sensor, and determining the cooling / heating operation mode by the valve controller based on the detected temperature. You may. However, in the method of judging based on the room temperature, the necessity of air conditioning is divided according to individual differences, and it is expected that the judgment in the middle period is likely to be difficult. The application can be considered only when the determination is made or when the usage mode is clear.

[0014]

When the operation of the fan unit is started, outside air or room air is introduced into the coil unit through the duct, and the air cooled or heated by the coil unit is blown out of the fan unit into the room to perform cooling or heating. Do.

At the time of this operation, the coil of the cold / hot water type has a higher heat exchange capacity at the time of heating than at the time of cooling, so that a problem of excessive heating occurs. Therefore, the heat medium temperature detection sensor detects the temperature of the heat medium flowing in the main pipe,
This is input to the valve controller. The valve controller determines that the refrigerant (cooled water) is circulating when the input heat medium temperature is within a preset cooling temperature range of the heat medium or lower than the predetermined temperature. A signal is output to the actuator so that the opening of the control valve is based on the control valve, and the opening of the control valve is set to the cooling mode.

On the other hand, when the heating medium temperature detection sensor detects the heating medium temperature corresponding to the heating operation mode, it is determined that hot water is circulating, and the heating operation mode, that is, the opening of the control valve is compared with that in cooling operation. Control is performed in advance so that the problem of throttling and excessive heating does not occur.

Next, the operation modes of the fan unit (strong,
The information of (medium, weak) is also input from the airflow signal transmitter to the valve controller, and the valve controller sends a signal to the actuator based on this information, and controls the opening of the control valve as follows.

Air volume increase → Valve opening increase Air volume decrease → Valve opening decrease

FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a heat medium return pipe in the main pipe, 2 denotes a heat medium return pipe in the main pipe, 3 denotes a branch heat medium return pipe, 4 denotes a branch heat medium return pipe, and 5 denotes a coil unit.
A cold / hot water type coil (heat exchanger) 6 is built therein.

Reference numeral 7 denotes a step control type (three-step control type of strong, medium, and weak) fan units mounted in each room, 8 denotes a fan, and 9 denotes an operating device (thermo switch) of the fan unit 7. Can be switched to three steps of strong, medium and weak, and a step signal transmitter (transmitting circuit) 9a for transmitting the set value is built in.

Reference numeral 10 denotes a control valve with an actuator 11 inserted into the branch heat medium delivery pipe 3.

Reference numeral 12 denotes a controller of the control valve 10, which performs the following control.

A. When one of the fan units 7 is operating, a control signal is sent to the valve actuator 11 in accordance with the step signal of the fan unit 7, and when the fan unit 7 is strong, the control valve 10 is set to a strong step (air volume). Open so that the flow rate is set in advance so as to meet the requirements.

B. When the operation of the plurality of fan units 7 is performed simultaneously, the opening of the control valve 10 is controlled so that the flow rate becomes a preset flow rate corresponding to the total air volume in this step. In the figure, 14 is a coil unit 5
And a duct connecting the fan unit 7 with the fan unit 7.

Reference numeral 15 denotes a heat medium temperature detection sensor attached to the heat medium flow pipe 1 in the main pipe.
When the temperature of the heat medium detected in the above is within the temperature range during the cooling operation, the valve controller 12
Is set in advance to the valve opening during the summer cooling in FIG. Then, the valve opening is controlled by the total air volume of the fan unit 7. Next, when it is in the heating operation range, the opening degree of the control valve 10 is reduced in advance as compared with the time of cooling. The control based on the total air flow based on the operation of the fan unit 7 is the same as that during cooling.

[0025]

As described above, according to the present invention, the total air volume of each fan unit is input to the valve controller, and the opening of the control valve (the amount of heat medium) is controlled based on this value. The actuator does not hunt because the set value is obtained based on the amount of residual heat in the coil unit or the sensitivity of the temperature sensor. Therefore, the durability of the control device is not adversely affected.

Next, since the fan unit adjusts the air volume by step control, this step has at most three steps of strong, medium and weak. For this reason, even if the number of fan units increases, the control range may be considerably narrower than the conventional one.

Therefore, the control device can be simplified and the control valve can be reduced in size.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a duct type air conditioning system according to the present invention.

FIG. 2 is an explanatory diagram of a control example of a control valve.

FIG. 3 is an explanatory diagram of a conventional duct type air conditioning system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat medium feed pipe 2 heat medium return pipe 3 branch heat medium return pipe 4 branch heat medium return pipe 5 coil unit 6 coil 7 fan unit 8 fan 9 operation unit 9a step signal transmitter 10 control valve 11 actuator 12 valve controller 13 temperature Sensor 14 Duct 15 Heat medium temperature detection sensor

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiyoshi Nakayama 2-6-7 Wakamiya, Nakano-ku, Tokyo (72) Inventor Eiji Ashikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72 ) Inventor Toshikazu Sakuma 4-3-1, Hatchobori, Chuo-ku, Tokyo Inside Heating and Cooling Industry Co., Ltd. (56) References JP-A-58-69343 (JP, A) 58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 11/02

Claims (2)

(57) [Claims] 1. A method comprising: a. Outside air or room air is introduced into a single coil unit having a built-in coil for both hot and cold water through which a heat medium circulates, through a duct, and air cooled or heated by this coil unit is passed through the duct to each of the units. A duct-type air conditioning system configured to perform cooling or heating by blowing out from a step-controlled fan unit mounted in a room; b. An airflow signal transmitter is mounted on the fan unit; c. A heat medium temperature detection sensor is attached to a part of the heat medium flow pipe in the main pipe; d. Inserting a control valve with an actuator on the inlet or outlet side of the coil unit; e. When the heating medium temperature input from the heating medium temperature detection sensor is within a preset heating temperature range, a throttle signal is output to the actuator to set the control valve opening to the heating mode, and this setting is performed. In this state, when the cooling temperature range is detected, the air conditioner is switched to the cooling mode, and as the total airflow value input from the airflow signal transmitter increases, the amount of the heat medium circulating in the coil unit increases, and the total airflow decreases. A valve controller for outputting a control signal to the actuator of the control valve so as to reduce the amount of the heat medium as the operation proceeds; f. A duct type air conditioning system characterized by the following. 2. An indoor temperature detection sensor is mounted in a room to which the fan unit is mounted. When the indoor temperature input from the indoor temperature detection sensor is within a preset heating temperature range, the opening of the control valve is adjusted. 2. A duct type air conditioning system according to claim 1, wherein a circuit for switching the opening of the control valve to the cooling mode when the heating mode is set and the cooling temperature range is detected is added to the valve controller.