JPH09159254A - Operation control for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability while incorporating the comfortableness and economy by providing a thermistor for detecting outdoor and indoor air temperatures and a driving motor for operating or stopping entire heat exchanging rotors. SOLUTION: An entire heat exchange rotors 1 is rotated by driving it by a rotor driving motor 2 according to the command from a control case 5. A compressor 13 for constituting a refrigerating cycle together with a direct expansion coil 12 is also operated or stopped according to a command from the case 5. The case 5 can recognizes the outdoor and indoor air temperatures by outdoor and indoor temperature thermistors 3, 4. Since the air temperature introduced to the coil 12 is decided by the indoor circulating temperature, outdoor suction temperature and the temperature exchange efficiency of the rotor 1, and hence it can be calculated by the case 5. Accordingly, it can judge from the outdoor and indoor air temperatures whether the heating or cooling of the coil 12 by the operation of the compressor 13 is needed or not or whether the heat recovery of the rotor 1 is needed or not to obtain the comfortable indoor diffusing air temperature.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to control of an air conditioner with a rotary total heat exchanger.

[0002]

2. Description of the Related Art Ventilation, which is an element of air conditioning, is legally regulated by the Building Management Act, the Energy Conservation Act, etc. Therefore, while interest in heat recovery as well as ventilation has deepened, the demand for total heat exchangers has increased. However, there is a limit to the amount of heat recovered by heat recovery with a total heat exchanger, and the temperature of the air actually blown into the room does not always reach a comfortable temperature. An air conditioner with a total heat exchanger that can be used has appeared.

According to the conventional technique, the total heat exchange operation and the ventilation operation are switched by a bypass passage provided in the blower path and passed through a direct expansion coil installed downstream of the bypass passage.
The method as seen in Japanese Patent No. 575 is used.

[0004]

In the prior art, the direct expansion coil is made to flow regardless of the outdoor air temperature, and the operation of the compressor for flowing the refrigerant through the direct expansion coil is controlled by the indoor air temperature. Was there. Therefore, even if the heat recovery in the intermediate period is unnecessary, the refrigerant is caused to flow through the direct expansion coil, so that the compressor is operated, resulting in poor economy. Further, in the cooling operation when the outdoor air temperature is extremely low, there is a problem that the refrigerant cannot be completely evaporated in the direct expansion coil and the compressor may be liquid-compressed and damaged.

An object of the present invention is to provide an air conditioner with a total heat exchanger that is comfortable, economical, and highly reliable.

[0006]

In order to solve the above problems, a thermistor capable of detecting the outdoor air temperature and the indoor air temperature and a drive motor for operating and stopping the total heat exchange rotor are provided. Furthermore, we have installed a control device that can control the operation and stop of the drive motor.

The present invention can control comfortably and economically by controlling the operation and stop of the total heat exchange rotor and the compressor of the air conditioner with a total heat exchanger. Conventionally, the compressor of the air conditioner was operated and stopped depending on the indoor air temperature even under the condition that heat recovery was not required during the intermediate period. According to the present invention, not only the indoor air temperature but also the outdoor air temperature are added as parameters to operate and stop the compressor, so that it is possible to improve economy while having comfort. Further, the outdoor air temperature is low, and the cooling operation outside the allowable operating temperature range of the air conditioner can be prevented without impairing the comfort.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the air conditioner with a total heat exchanger has a total heat exchange rotor 1 and a direct expansion coil 12 inside. The total heat exchange rotor 1 is rotated by a rotor drive motor 2 driven by a command from the control box 5. Also, the direct expansion coil 1
The compressor 13 that constitutes the refrigeration cycle together with the control box 5
It starts and stops according to the command from. The control box 5 can recognize the outdoor air temperature and the indoor air temperature by the outdoor temperature thermistor 3 and the indoor temperature thermistor 4. Since the temperature of the air introduced into the direct expansion coil 12 is determined by the indoor return air temperature (indoor temperature), the outdoor intake temperature (outdoor temperature) and the temperature exchange efficiency of the total heat exchange rotor 1, it must be calculated by the control box 5. You can Therefore, by providing the chart shown in FIG. 2 inside the control box 5, whether or not it is necessary to heat and cool the direct expansion coil 12 by operating the compressor 13 in order to obtain a comfortable indoor blown air temperature, and also the total heat exchange rotor 1 Whether or not heat recovery is required can be determined from the outdoor air temperature and the indoor air temperature.

Further, if the chart shown in FIG. 3 is applied in the summer, it is possible to cool the outside air when the outdoor air temperature is low, so that the heat recovery by the total heat exchange rotor 1 and the direct expansion coil 12 are possible.
It is economical because it does not need to be cooled and the compressor 13 does not need to be operated. When the outdoor air temperature is extremely low, the temperature of the air flowing into the direct expansion coil 12 is naturally low, but since the compressor 13 is stopped, damage to the compressor due to liquid compression does not occur and reliability can be improved. Next, when the outdoor air temperature is in the vicinity of the comfortable temperature, a comfortable blow-out temperature can be obtained only by operating the total heat exchange rotor 1, and similarly, it is not necessary to operate the compressor 13, which is economical. Further, by performing the operation and stop of the total heat exchange rotor 1 intermittently in this region, it is possible to perform a fine temperature control of the indoor blown air.

If the chart shown in FIG. 4 is applied in the winter season, the situation is the reverse of that in the summer season, and economical operation becomes possible in the same manner.

[0011]

According to the present invention, the operation stop of the total heat exchange rotor and the operation stop of the compressor can be controlled from the outdoor air temperature and the indoor air temperature, which is excellent in economy while maintaining comfort and has high reliability. It is possible to provide an air conditioner with a total heat exchanger having good properties.

[Brief description of the drawings]

FIG. 1 is a system diagram of an air conditioner with a total heat exchanger showing an embodiment of the present invention.

FIG. 2 is a timing chart of control applied to the present invention.

FIG. 3 is a timing chart of control during cooling.

FIG. 4 is a timing chart of control during heating.

[Explanation of symbols]

1 ... Total heat exchange rotor, 2 ... Rotor drive motor, 3 ... Outdoor air temperature thermistor, 4 ... Indoor air temperature thermistor, 5
… Control box, 6… Air supply fan, 7… Exhaust fan, 8…
Indoor air supply port, 9 ... Indoor air return port, 10 ... Outdoor air exhaust port, 11
... Outdoor suction port, 12 ... Direct expansion coil, 13 ... Compressor, 14
... condenser, 15 ... outdoor blower, 16 ... expansion valve, 17 ... four-way valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Togusa 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Air Conditioning Systems Division

Claims (1)

[Claims] 1. A method for controlling operation of an air conditioner, which comprises operating and stopping a compressor of an air conditioner according to the temperature of outdoor air introduced into a rotary total heat exchanger.