JPS6380149A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable the intake of outer air to be controlled by a method wherein a pressure difference across the outer air side of full heat exchanger is detected by a pressure difference sensor and the degree of opening of an air return damper is controlled from a difference between a measured value and a set value. CONSTITUTION:A full heat exchanger 16 is arranged at a passage extending from an air circulation fan 11 to a discharged part C1 out of a room and another passage taking outer air D1 as supplied air B1 and then the calorie of the discharge air C1 is recovered when the outer air D1 is take into the room. In case that an introduction of outer air is required, a set value of a pressure difference across the full heat exchanger 16 is changed for its setting as required in response to a required amount of outer air. At this time, an air circulation damper 12 opens or closes in response to a difference between the measured pressure difference value sensed by a pressure difference sensor 17 and a set value, a part of returned air A1 fed through an air circulation fan 11 is passed through a full heat exchanger 16 and discharged therethrough, and at the same time the surrounding atmosphere D1 passed through the full heat exchanger 16 is mixed with the air passed through the air circulation damper 12, passed through a filter 13, a cold or hot water coil 14 and then is fed into the room by an air feeding fan 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner that has an exhaust heat recovery function and controls the amount of outside air taken in.

2. Description of the Related Art In recent years, air conditioners have been equipped with total heat exchangers for exhaust heat recovery, and the amount of outside air taken in has been controlled.

As shown in Figure 2, this type of air conditioner consists of a return air fan 1 that introduces indoor air (return air) A2, a return air damper 2 that passes the circulated portion of the introduced air, and a A filter 3 that removes the air, a cold/hot water coil 4 that heats or cools the air, an air supply fan 6 that sends the air (supply air) B2 into the room, and a heat quantity of the exhaust air C2 when taking in outside air D2. The structure includes a total heat exchanger 6 for recovery.

With this configuration, when it is not necessary to introduce the outside air D2, the indoor air (return air) A2 introduced into the air conditioner by the return air 7 An 1 passes through the return air damper 2 and enters the filter 3. After the dust is removed, the water is heated or cooled by the cold/hot water coil 4 and then sent into the room by the air supply fan 6.

Next, when the outside air D2 is requested to be introduced, the return air damper 2 is opened and closed according to the required amount.
Control is performed to change the mixing ratio of D2 and outside air D2. Further, when the outside air D2 is taken in, the heat amount of the exhaust gas C2 is recovered by the total heat exchanger 6.

Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, there was no means for determining the amount of outside air intake, and the amount of outside air was taken in relatively. This has had the problem of causing mutual interference with other control systems, such as fluctuations in the amount of air supplied due to fluctuations in the air intake.

The present invention takes into consideration the above-mentioned conventional problems and provides an air conditioner that can appropriately control the amount of outside air intake when a total heat exchanger is incorporated.

In order to achieve the goal of solving the problem, the air conditioner of the present invention is provided with a differential pressure detector that detects the differential pressure across the total heat exchanger in the outside air air path. The configuration is such that the opening/closing degree of the return air damper is controlled according to the deviation between the detected differential pressure and the set value.

Effect With this configuration, if the return air damper is controlled so that the differential pressure across the total heat exchanger approaches the set value, the differential pressure and air volume are proportional, so the required outside air air volume can be set. It will be done.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an air conditioner in an embodiment of the present invention. In Fig. 1, 11 is a return air fan that introduces indoor air (return air) A, and a return air damper 12 is installed in the air path that circulates the introduced air into the room as supply air B1. A filter 3 that removes dust,
A cold/hot water coil 14 for heating or cooling air, a supply air B, and an air supply fan 16 for feeding into one room are sequentially provided. A total heat exchanger 16 is disposed in the passage from the return air fan 11 to the exhaust air C1 outside the room and in the passage that takes in the outside air DI supply air B1.
1 of the amount of heat is recovered. Further, a differential pressure detector 17 for detecting the differential pressure across the total heat exchanger 16 is provided in the air passage on the outside air D1 side.

The operation of the air conditioner configured as above will be described below. First, when it is not necessary to introduce outside air D1, the indoor air (return air) A1 introduced into the air conditioner by the return air fan 11 passes through the return air damper 12 which is in a fully open state, and then passes through the filter 13. After removing dust, the water is heated or cooled by the cold/hot water coil 14,
The air is sent into the room by the air supply fan 15. Next, when there is a request to introduce outside air, the total heat exchanger 16
The setting value of the differential pressure before and after is changed as needed. At that time, the return air 71 is released by opening and closing the return air damper 12 according to the deviation between the measured value of the differential pressure detected by the differential pressure detector 17 and the set value.

At the same time, a part of the return air A1 that has been introduced is passed through the total heat exchanger 16 and exhausted, and at the same time, the outside air D1 that has passed through the total heat exchanger 16 is mixed with the air that has passed through the return air damper 12. , filter 13, hot and cold water coil 14t-pass through, supply air 7
At 1/16, he was sent into the room.

Effects of the Invention As is clear from the above description of the embodiments, the present invention provides a differential pressure detector that detects the differential pressure across the total heat exchanger, thereby allowing the required amount of outside air to be set once as the absolute value of the differential pressure. However, by controlling the amount of outside air intake with the return air damper so that it approaches the set value, stable control of the amount of outside air intake can be performed without interfering with other control systems. , and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a block diagram of a conventional air conditioner. 11...Return air fan, 12...Return air damper, 16...Air supply 7 amps, 16...
Total heat exchanger, 17...Differential pressure detector.

Claims (1)

[Claims] A return air fan for introducing indoor air; a return air damper for distributing the air introduced by the return air fan into exhaust air and return air; and a return air damper for distributing the air introduced by the return air fan into exhaust air and return air; and a total heat exchanger that serves as a passage between the exhaust gas and outside air. An air conditioner configured to control the opening degree of the return air damper based on the deviation of the return air damper.