JPH0442658Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air conditioner, and particularly to an air conditioner that improves a cooling supply system for the outside air conditioner, in an air conditioner including an outside air conditioner and an air conditioner. Regarding equipment.

[Conventional technology]

Conventionally, in this type of air conditioner, as an example of the system diagram is shown in FIG. The air is then processed by the air blower 20 and sent to the next air conditioner 21. In the air conditioner 21 as well, the air is processed by the cooling coil 22, the heating coil 23, and the humidifier 24, and is sent to the air-conditioned area by the blower 25. The air returned from the air conditioned area is returned to the inlet of the air conditioner 21 and is circulated. here,
During winter, when the outside air temperature is low, the outside air directly comes into contact with the cooling coil 16 of the outside air conditioner 19, which often causes the cold water inside the cooling coil 16 to freeze, resulting in coil breakage accidents. As a countermeasure against this, a heating mechanism 15 is usually provided in front of the cooling coil 16, and the temperature of the outside air is adjusted to be equal to or higher than the freezing temperature. In the example of FIG. 2, the heating mechanism 1
No. 5 heats the introduced outside air using steam, but heating is also performed using an electric heater.

[Problem that the invention attempts to solve]

In order to prevent the cooling coil of the outside air conditioner from being damaged by freezing during operation in winter, the conventional air conditioner described above is equipped with a heating mechanism using steam or an electric heater in the front stage of the cooling coil. , or if no heating mechanism is used.
Measures are taken to prevent freezing by constantly circulating cold water within the cooling coil. Therefore, in any of the above cases, there is a drawback that power is wasted.

[Means for solving problems]

The air conditioner of the present invention is an air conditioner formed by an upstream air conditioner that takes in outside air and an air conditioner that is installed at a later stage. a switching valve that switches between cold water to be supplied to the cooling coil of the outside air conditioner and heat-exchanged cold water obtained from the cooling coil of the air conditioner, and supplies the cold water to the cooling coil of the outside air conditioner; a control circuit that automatically controls a switching action by the switching valve by referring to a temperature detection signal output from the temperature detector;
It is composed of:

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a system configuration diagram showing the main parts of an embodiment of the present invention. As shown in FIG. 1, this embodiment includes a temperature detector 1, a controller 2, solenoid valves 3 and 4, a cooling coil 5, a heating coil 6, and a humidifier 7.
and an outside air conditioner 8 including a blower 9, and an air conditioner 10 including a cooling coil 11, a heating coil 12, a warmer 13, and a blower 14.

In FIG. 1, outside air introduced from an outside air inlet of an outside air conditioner 8 is processed by a cooling coil 5, a heating coil 6, and an air conditioner 7, and then sent to the next air conditioner 10 by a blower 9. In the air conditioner 10 as well, the air is processed by the cooling coil 11, heating coil 12, and humidifier 13, and sent to the air-conditioned area by the blower 14. Return air from the air conditioned area is returned to the inlet of the air conditioner 10 and is circulated. In this case, the temperature detector 1 provided at the outside air inlet of the outside air conditioner 8 detects the temperature of the outside air introduced from the outside air inlet, and outputs a predetermined temperature detection signal to the controller 2. Sent. The controller 2 refers to the temperature detection signal and controls the solenoid valve 3 so that the solenoid valve 3 is "open" when the outside air temperature is higher than the freezing temperature of the cold water inside the cooling coil 5. , a solenoid valve control signal that controls the solenoid valve 3 so that when the outside air temperature falls below the freezing temperature of the cold water inside the cooling coil 5, the solenoid valve 3 is "closed" and the solenoid valve 4 is "open". is generated and sent to each solenoid valve. As is clear from FIG. 1, when the solenoid valve 3 is "open",
The original cold water supplied to the cooling coil 5 is supplied to the solenoid valve 3.
On the other hand, the heat-exchanged cold water sent from the cooling coil 11 of the air conditioner 10 is discharged to the outside of the air conditioner via another solenoid valve 3. . Further, when the solenoid valve 3 is "closed" and the solenoid valve 4 is "open", the heat-exchanged cold water is supplied to the cooling coil 5 via the solenoid valve 4. This heat-exchanged cold water is heat-exchanged in the cooling coil 11 of the air conditioner 10 and the water temperature has increased, so that the cooling coil 5 is heated by outside air.
Freezing inside is prevented. Moreover, it also contributes to an increase in the outside air temperature, and it becomes possible to reduce the load on the heating coil 6 at the subsequent stage.

[Effect of idea]

As explained above, the present invention provides an outside air conditioner with an outside air temperature detector and a switching valve for cooling coil water supply, and when the outside air temperature drops in winter, heat is exchanged in the air conditioner in the subsequent stage. By automatically switching the heat-exchanged cold water whose water temperature has increased and supplying it to the cooling coil of the outside air conditioner, it is possible to prevent the cooling coil from freezing, and the heating mechanism in the outside air conditioner can be eliminated. This has the effect of not only eliminating unnecessary power consumption but also reducing the amount of heating consumed by the subsequent heating coil.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.
FIG. 2 is a system configuration diagram of a conventional air conditioner. In the figure, 1... Temperature detector, 2... Controller, 3, 4... Solenoid valve, 5, 11, 16, 22...
... Cooling coil, 6, 12, 17, 23 ... Heating coil, 7, 13, 18, 24 ... Humidifier, 8, 1
9... Outside air conditioner, 9, 14, 20, 25... Air blower, 10, 21... Air conditioner, 15... Heating mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] In an air conditioner formed by an upstream air conditioner that takes in outside air and an air conditioner that is installed at a downstream stage, a temperature sensor that is installed at an outside air inlet of the outside air conditioner. and a switching valve that switches between cold water to be supplied to the cooling coil of the outside air conditioner and heat-exchanged cold water obtained from the cooling coil of the air conditioner, and supplies the cold water to the cooling coil of the outside air conditioner; An air conditioner comprising: a control circuit that automatically controls a switching action by the switching valve with reference to a temperature detection signal output from the temperature detector.