JPH0626693A - Control method of air conditioner - Google Patents

Abstract

PURPOSE:To diminish an uncomfortable feeling by a method wherein first and second room temperature detectors which are located at different elevations are provided, a fan is brought in operation and a compressor is stopped when the output from the first or second detector is not less than a specified value and the difference between the outputs of the first and second detectors is a specified value or higher, and the compressor is re-started when the output of the first or second detector is not higher than a specified value. CONSTITUTION:For example, upper and lower part room temperatures T1 and T2 are detected by thermistors 5 and 10 at one-minute intervals, and heating operation is continued when T2 is not higher than 15 deg.C. and both fan and compressor are stopped when T2 exceeds 15 deg.C and T1 exceeds a set point TS. When T1 is not higher than TS and differential temperature between T1 and T2 is less than 3 deg.C, for example, heating operation is continued, and when it is 3 deg.C or higher, the fan remains operated and the compressor is stopped. The fan is operated until T2 drops below 15 deg.C and the compressor is re-started when T2 drops below 15 deg.C. When the differential temperatures between upper and lower parts in a room are kept within 3 deg.C or lower, it is allowable for a large majority and a comfortable heating operation can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for an air conditioner for heating and cooling by directly heating and cooling indoor air for home and business.

[0002]

2. Description of the Related Art A conventional room temperature control method for an air conditioner, which cools and heats indoor air by directly heating and cooling it, is as follows.
The intake air temperature is detected and the temperature is controlled to reach a set value. Also, since many air conditioners are wall-mounted, an indoor unit is installed near the ceiling, so that room temperature control is performed by sensing only the temperature of air near the ceiling.

[0003]

However, in such a conventional control method for an air conditioner, particularly during heating,
Temperature stratification was created by the difference in air density, and high-temperature low-temperature air stayed downward and low-density high-temperature air stayed upward, causing a large temperature difference between the upper and lower parts of the room.

FIG. 3 shows a case where heating is performed by a conventional air conditioner (air temperature of 10 cm above the floor-air temperature of 230 cm above the floor).
As a result of actual measurement, the value increased with time, and a temperature difference of 8.6 ° C occurred in 1 hour. For this reason, the air temperature near the feet is low despite reaching the set room temperature, which often causes discomfort. Further, if the set room temperature is raised to increase the air temperature near the feet, the room temperature near the head becomes even higher, which is also uncomfortable.

In view of the above points, an object of the present invention is to provide an operation control method for an air conditioner in which the temperature difference between room temperature and room temperature is constantly reduced to reduce discomfort.

[0006]

The technical means of the present invention for solving the above problems includes at least a compressor, an outdoor heat exchanger and an expansion valve as an outdoor unit, and at least an indoor heat exchanger and a fan as an indoor unit. And a first room temperature detecting means and a control device, and a second room temperature detecting means which is vertically different from the first room temperature detecting means, and the control device includes the first or second room temperature detecting means. When the output of the room temperature detecting means is a certain value or more and the output difference of the first and second room temperature detecting means is a certain value or more, the compressor is stopped while operating the fan, and the first or second The control method of the air conditioner is to restart the compressor when the output of the room temperature detecting means is below a certain value.

[0007]

The function of this technical means is as follows.
When indoor air is directly heated or cooled, temperature stratification is formed due to the difference in density of the air itself. In other words, warm air has a low density and stays near the ceiling, and cold air has a high density and stays near the floor. Therefore, during heating, if the temperature difference between the upper and lower indoor temperatures and the room temperature are above a certain value, the compressor is stopped to stop the circulation of the refrigerant to the indoor heat exchanger, and only the fan is operated to circulate the indoor air. As a result, the temperature difference between the upper and lower indoor air is reduced, and the coldness at the feet and the uncomfortable warmth of the head are eliminated. Also, when the room temperature falls below a certain value, the compressor is restarted and the heating is restarted, so that the heating is always comfortable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a configuration diagram of a heat pump type cooling and heating apparatus showing an embodiment of the air conditioner of the present invention. As shown in the figure, the indoor unit 1 includes an indoor heat exchanger 2, a fan 3, a controller 4, a first thermistor 5 as a room temperature detecting means (installed on the floor 230 cm), and the outdoor unit 6 is an outdoor heat exchanger. 7, a compressor 8, an expansion valve 9 and the like. Reference numeral 10 is a thermistor (installed on the floor 10 cm) as a second room temperature detecting means, and the control device 4 inputs the outputs of the thermistors 5 and 10 and controls the control line 11
The start / stop of the compressor 8 is controlled by. 12 is the wall of the house.

Next, the operation of this embodiment will be described. FIG. 1 is an operation flowchart showing a heating operation control method for a heat pump type air conditioner. When the air conditioner is turned on as shown in the figure (step 1), for example, the thermistors 5 and 10 sense the indoor upper temperature T ₁ and the indoor lower temperature T ₂ every 1 minute (step 2), and T ₂ is 15 If the temperature is lower than ℃, the heating operation is continued (step 3), and if it exceeds 15 ℃ and T1 exceeds the set temperature Ts (step 4), both the fan and the compressor are stopped, that is, the air conditioner is stopped ( Step 5). If T ₁ is Ts or less, if the temperature difference between T ₁ and T ₂ is, for example, less than 3 ° C (step 6), heating operation continues (step 7), but if 3 ° C or more, fan operation continues. However, the compressor is stopped (step 8). Further similarly sense the T _1, T ₂ (step 9), T ₂ is the operation of the fans only until 15 ℃ below, T ₂ restarts the becomes a 15 ℃ below (step 10) the compressor (Step 11).

In this embodiment, the temperature difference between T ₁ and T ₂ is 3 ° C.
The heating operation was stopped as described above, but if the temperature difference between the upper and lower parts of the room is within 3 ° C, only two out of ten people feel uncomfortable, and the temperature difference is acceptable for the majority of people. As the temperature for starting heating, the temperature may be appropriately changed according to taste, and the sensing positions of T ₁ and T ₂ are 230 cm and 1 cm on the floor.
It is not limited to 0 cm, and similar effects can be obtained if the vertical position is different.

[0011]

As described above, according to the present invention,
An air conditioner that heats or cools the indoor air directly by heating or cooling it.When the room temperature is higher than a set value and the indoor upper and lower air temperature difference is above a certain value during heating operation, the indoor air is circulated to raise and lower the indoor air temperature. The difference can be reduced and kept within a certain value. When the room temperature falls below the set value, the compressor is restarted and the heating operation is restarted. As a result, a comfortable heating operation can always be realized, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is an operation flowchart of a heat pump type air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the air conditioner.

FIG. 3 is a measurement diagram of the temperature difference between the upper and lower sides of the room by the conventional air conditioner.

[Explanation of symbols]

 2 Indoor heat exchanger 3 Fan 4 Control device 5 Thermistor 8 Compressor 10 Thermistor

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hisashi Kodama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroyuki Miyamoto, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. An outdoor unit having at least a compressor, an outdoor heat exchanger and an expansion valve, and an indoor unit having at least an indoor heat exchanger, a fan, a first room temperature detecting means and a control device.
A second room located vertically different from the first room temperature detecting means
The room temperature detecting means, the output of the first or second room temperature detecting means is equal to or more than a certain value during heating,
When the output difference between the first and second room temperature detecting means becomes a certain value or more, the compressor is stopped while operating the fan, and the output of the first or second room temperature detecting means becomes a certain value or less. Then, a method of controlling the air conditioner, wherein the compressor is restarted.