JP2002188843A - Outdoor air treating unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality treatment countermeasure when dehumidification operation becomes impossible due to the abnormality of a sensor or internal apparatuses in automatically controlling an outdoor air treating unit having two coils for avoiding the lowering of a room temperature during dehumidification operation. SOLUTION: In the case where abnormality occurs in a humidity sensor or where abnormality occurs in the operation of the coils, operation is continued in either the cooling, blowing or heating mode that had been set before the dehumidification operation is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air processing unit having at least an air supply function, which has a function of heating, cooling and dehumidifying outside air by using a heat source device when introducing outside air into a room. The present invention relates to automatic operation mode control of an outside air processing unit having two coils for once cooling and then heating process air so as not to lower the room temperature during operation. In particular, in the dehumidifying operation mode,
It relates to abnormal processing when operation becomes impossible due to abnormalities of sensors and coils.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 8-14600 discloses an outside air processing unit that performs dehumidification of outside air during a cooling operation, exchanges heat between exhaust air and supply air, and performs ventilation during a heating operation. There has been proposed a structure in which humidification is performed on the outside air and ventilation is performed while exchanging heat between the exhaust air and the supply air.

[0003]

Problems to be Solved by the Invention
The outside air processing unit disclosed in the above publication processes outside air and introduces it into a room, and is mainly configured to independently control temperature and humidity. However, there is no mention of a countermeasure for an abnormal occurrence during automatic driving.

[0004]

An outside air processing unit according to the present invention is provided in an air passage connected to an outside air temperature sensor for detecting outside air temperature, a humidity sensor for detecting indoor humidity, and an air supply port. An outside air processing unit comprising: a first coil for heating and cooling; and a second coil disposed downstream of the first coil for heating air passing through the first coil. Cooling mode, an operation mode determining means for determining a ventilation mode in accordance with only the value, and a dehumidifying operation determining means for determining whether to perform a dehumidifying operation based on a predetermined reference value of the humidity sensor, When an abnormality occurs in the humidity sensor or when an abnormality occurs in the heating operation of the second coil, the dehumidifying operation determining unit determines that the dehumidifying operation is not performed, and the operation determined by the operating mode determining unit is performed. It is intended to continue the operation in accordance with the over-de.

The outside air processing unit according to the present invention is provided with an outside air temperature sensor for detecting the outside air temperature, a humidity sensor for detecting the indoor humidity, and a first passage for heating and cooling the outside air, which is installed in a ventilation path connected to an air supply port. And a second coil installed downstream of the first coil and heating and cooling the air passing through the first coil, in accordance with the value of the outside air temperature sensor. Cooling, heating,
An operation mode determining means for determining a blowing mode, and a dehumidifying operation for determining whether to perform a dehumidifying operation based on a predetermined reference value of the humidity sensor when a cooling mode or a blowing mode is selected by the operating mode determining means. Determining means for operating the first coil, the dehumidifying operation determining means determines not to perform the dehumidifying operation, and the second mode is determined according to the operation mode determined by the operation mode determining means. The operation is continued by heating and cooling with only the coil of (1).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention FIG. 1 shows a configuration block diagram of an outside air processing unit according to Embodiment 1 of the present invention. In the drawing, an outside air processing unit according to the present invention has a unit main body 1 having a control device 2 for performing overall control.
And a total heat exchanger 3 for exchanging heat between supply air and exhaust air
A first coil 4 for circulating a cooling / heating refrigerant from an external heat source device (not shown), and a second coil 5 for circulating a heating refrigerant from an external heat source device (not shown) or an electric heater And a plurality of internal functional components such as a humidifier 6, an electromagnetic valve 13 for supplying and stopping water to the humidifier 6, an exhaust fan 7 having a variable blowing capacity, and an air supply fan 8 having a variable blowing capacity.

The outside air processing unit according to the present invention further comprises an outside air temperature sensor 9 for detecting the temperature of outside air, a room temperature sensor 10 for detecting the temperature of room air, a humidity sensor 11 for detecting room humidity, and It has a plurality of sensors, a temperature sensor 20 for detecting the surface temperature of the first coil, and a temperature sensor 21 for detecting the surface temperature of the second coil.

Further, in the outside air processing unit according to the present invention, an outside air port 14 for introducing outside air into the unit body 1, an exhaust port 15 for discharging exhaust air from the unit body 1, and a room exhaust air sucked into the unit body 1. It has a plurality of vents, a return air port 16 and an air supply port 17 for sending fresh air from the unit body 1 into the room.

Further, the outside air processing unit according to the present invention includes a bypass damper 18 that opens and closes a bypass path that bypasses the total heat exchanger 3, a first ventilation path 25 through which air introduced from the outside air port 14 passes. From the first ventilation passage 25, the heat is passed through the total heat exchanger 3 when the total heat exchanger is operated, and the second ventilation passage 26 that can pass through the bypass damper 18 during the bypass ventilation operation. A plurality of ventilation paths, including a third ventilation path 27 through which the supplied air passes, and a fourth ventilation path 28 through which the air introduced from the return air port 16 passes through the total heat exchanger 3 from the third ventilation path 27. have.

Further, the outside air processing unit according to the present invention has a remote controller 29 for manual operation and an automatic operation / manual operation switch 30 attached to the control device 2.

Next, the operation will be described. First, the four operation modes of the outside air processing unit will be described. In the blowing mode, the air supply fan 8 and the exhaust fan 7 are driven, the heating and cooling functions of the first coil 4 are stopped, and the second
The heating function by the coil 5 is stopped, and the humidifier 6 is also stopped to perform a normal ventilation operation.

In the cooling mode, the air supply fan 8 and the exhaust fan 7 are driven, the first coil 4 is cooled, and the second coil 5 and the humidifier 6 are stopped. The indoor temperature control in the cooling mode is performed while comparing the detected temperature of the indoor temperature sensor 10 with a preset cooling target temperature (for example, 28 ° C.).

In the heating mode, the air supply fan 8 and the exhaust fan 7 are driven, the first coil 4 is heated, the second coil 5 is appropriately heated according to the indoor air conditioning load, and the humidifier 6 is operated. Let it. The indoor temperature control in the heating mode is performed while comparing the detected temperature of the indoor temperature sensor 10 with a preset heating target temperature (for example, 16 ° C.).

In the dehumidification mode, the air supply fan 8 and the exhaust fan 7 are driven, the first coil 4 is cooled, the second coil 5 is heated, and the humidifier 6 is stopped. The room temperature control in the dehumidification mode is performed by changing the performance of the first coil 4 or the second coil 5 according to the detection temperature of the room temperature sensor 10 with the detection temperature of the room temperature sensor 10 immediately after the start of the dehumidification mode as a target temperature. Do.

The automatic operation / manual operation switch 30 is
If manual operation is set by the remote controller 29,
Each of the above-described operation modes of air blowing, cooling, heating, and dehumidification is selected by a user's command from the remote controller 29, and the operation is performed in a fixed mode.

The automatic operation / manual operation switch 30 is
When automatic operation is set by the remote controller 29,
According to the automatic operation switching state determination MAP as shown in FIG. 2, each of the above-described operation modes of air blowing, cooling, heating, and dehumidification is automatically switched to operate.

The operation during automatic operation will be described below. The switching of the operation mode depends on the outside air temperature and the indoor humidity detected by the outside air temperature sensor 9 installed in the first ventilation passage 25 and the humidity sensor 11 installed in the third ventilation passage 27.

At the start of the automatic operation, particularly when starting from a stopped state, the operation is performed in the air blowing mode until the outside temperature sensor 9 and the humidity sensor 11 are stabilized, for example, three minutes, and then the automatic operation is started. I do.

First, according to the automatic operation switching state determination MAP shown in FIG. 2 based on the outside air temperature, the operation mode determination means performs a heating operation if the outside air temperature is lower than 14 ° C.
If the outside air temperature is 14 ° C or higher and lower than 26 ° C, the air blowing operation
If the outside air temperature is 26 ° C. or higher, it is determined that the cooling operation is to be performed and the operation mode is switched.

Next, when the operation mode is the ventilation and cooling operation, the dehumidifying operation determining means determines whether or not the dehumidifying operation is possible according to the value of the humidity sensor 11. For example, during the blowing operation, if the indoor humidity is 70% or more, the operation mode is switched to the dehumidifying operation,
If it is less than 70%, the blowing operation is continued. During the cooling operation, if the indoor humidity is 70% or more and the outside air temperature is 28 ° C. or more, the cooling operation is continued. If the indoor humidity is 70% or more and the outside air temperature is less than 28 ° C., the operation is switched to the dehumidifying operation, and the indoor humidity 70%. If less, the cooling operation is continued.

For example, when the humidity sensor 11 has detected a relative humidity range of 10% or less and 95% or more, the control device 2 determines that a normal value of humidity has not been detected and determines that the operation of the humidity sensor 11 is abnormal. .

The control device 2 includes a temperature sensor 2 installed on the surfaces of the first coil 4 and the second coil 5.
The temperature state of 0 and 21 is monitored, and when the heating is overheating or not heating, or when the cooling is not supercooled or cooled, it is determined that the coil is abnormal.

After the operation mode determination means determines the operation mode, when the dehumidification operation determination means determines whether or not the dehumidification operation is possible,
If the humidity sensor 11 is abnormal as described above, the control device 2 determines that the dehumidifying operation is impossible by the dehumidifying operation determining means, and continues the operation in the operation mode determined by the operating mode determining means.

Further, after the dehumidifying operation is determined by the dehumidifying operation determining means and the dehumidifying operation is started, if the temperature sensor 21 installed on the second coil 5 detects the occurrence of abnormal heating of the second coil 5, the control is performed. The device 2 determines that the dehumidification operation cannot be continued by the dehumidification operation determination means, and continues the operation in the operation mode determined by the operation mode determination means.

Embodiment 2 of the Invention Embodiment 2 of the invention
, The second coil is capable of heating and cooling by circulating cooling / heating refrigerant from an external heat source device. Other configurations are the same as the first embodiment of the invention.

After the operation mode determination means determines the operation mode, when the dehumidification operation determination means determines whether or not the dehumidification operation is possible,
If the humidity sensor 11 is abnormal as described above, the control device 2 determines that the dehumidifying operation is impossible by the dehumidifying operation determining means, and continues the operation in the operation mode determined by the operating mode determining means.

After the operation mode determination means determines the operation mode, the dehumidification operation determination means determines the dehumidification operation, and after the dehumidification operation is started, the temperature sensor 20 installed on the first coil 4 detects the temperature of the first coil 4. When an abnormality is detected, the control device 2
The operation mode determined by the operation mode determination means by determining that the dehumidification operation cannot be continued by the dehumidification operation determination means, stopping the operation of the first coil, and allowing the second coil 5 to perform the cooling / heating operation Continue driving with.

[0028]

According to the outside air processing unit of the present invention, when an abnormality occurs in the humidity sensor and an operation abnormality occurs in the first coil or the second coil, the controller switches to the dehumidification operation or performs the dehumidification operation. Without continuing, the operation is continued in the operation mode determined by the operation mode determination means,
The minimum thermal environment in the living room can be ensured. Therefore, when a resident is absent for a long period of time, it is possible to prevent deterioration of articles such as clothes and furniture in the living room.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an outside air processing unit according to the present invention.

FIG. 2 is a map MAP for determining an automatic operation switching state of the outside air processing unit according to the present invention.

[Explanation of symbols]

1 unit body, 2 control device,
3 total heat exchanger, 4 first coil, 5 second
Coil, 6 humidifier, 7 exhaust fan,
8 Air supply fan, 9 Outside temperature sensor, 10
Room temperature sensor, 11 Humidity sensor, 13
Solenoid valve, 14 outside air port, 15 exhaust port,
16 return air port, 17 air supply port,
18 bypass damper, 20 first coil surface temperature sensor, 21 second coil surface temperature sensor, 25 first
Ventilation path, 26 second ventilation path, 27 third ventilation path, 28 fourth ventilation path, 29 remote control, 3
0 Automatic operation / manual operation switch,

Claims (2)

[Claims] An outside air temperature sensor for detecting outside air temperature, a humidity sensor for detecting indoor humidity, a first coil installed in a ventilation path connected to an air supply opening, and cooling outside air, and the first coil. And a second coil for heating the air that has passed through the first coil. Means for determining whether or not to perform a dehumidifying operation based on a predetermined reference value of the humidity sensor, wherein an abnormality occurs in the humidity sensor or the second coil is heated. When an operation abnormality occurs, the dehumidification operation determining means determines not to perform the dehumidification operation, and continues the operation in accordance with the operation mode determined by the operation mode determination means. . 2. An outside air temperature sensor for detecting outside air temperature, a humidity sensor for detecting indoor humidity, a first coil installed in a ventilation path connected to an air supply port, for heating and cooling outside air, And a second coil installed on the downstream side of the coil for heating and cooling the air passing through the first coil, in a cooling mode, a heating mode, and a blowing mode according to the value of the outside air temperature sensor. Operating mode determining means for determining the air conditioner, and a dehumidifying operation determining means for determining whether to perform the dehumidifying operation based on a predetermined reference value of the humidity sensor when the cooling mode or the air blowing mode is selected by the operating mode determining means. When an operation abnormality occurs in the first coil, the dehumidification operation determining means determines not to perform the dehumidification operation, and the second mode is determined according to the operation mode determined by the operation mode determination means. Outside air processing unit, characterized by continued heating only coils, the operation by performing the cooling.