JPH05223320A - Method for judging cooling-heating of air conditioner - Google Patents

Abstract

PURPOSE:To precisely make a judgement of cooling.heating modes to perform proper air conditioning by a method wherein, after starting an operation, at a predetermined revolution, a control valve of a cold.hot water feed pipe is forcibly opened at another set time intervals for a predetermined set time period. CONSTITUTION:An air conditioning device 10 has a heat exchanger 13 wherein cold water is passed therethrough in a cooling mode and hot water is passed in a heating mode. And temperatures of cold and hot water is detected by a water temperature sensor 15 provided in a cold.hot water feed pipe 14a of the heat exchanger 13 so that water cooling mode or heating mode is judged at a control device 22. Further, corresponding to the mode thus decided and based on the differences between set temperature of cooling and heating and detected room temperature detected by a room temperature sensor 21, a control valve 16 provided in the pipe 14a and the number of revolution of a fan 12 are controlled by the device 22, wherein, after the start of operation, at a predetermined revolution, the control valve 16 is forcibly opened by the control device 22 at second set time intervals for a first set time period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a cooling / heating determining method for an air conditioner.

[0002]

2. Description of the Related Art Conventionally, cold water is passed to a heat exchanger in a cooling mode and hot water is passed in a heating mode, and a cold water temperature sensor provided in a cold / hot water supply pipe of this heat exchanger cools the water. An air conditioner has been proposed that detects the temperature of hot water to determine whether it is a cooling mode or a heating mode, and based on this determined mode, controls the opening of the control valve of the pipe and the rotation speed of the fan. (See Japanese Utility Model Laid-Open No. 3-48738).

[0003]

However, in the above-mentioned conventional air conditioner, since it is determined whether the mode is the cooling mode or the heating mode immediately after the start of operation, the cold / hot water near the water temperature sensor is not in a steady state. Alternatively, when the cold / hot water heat source is operated with a delay, the determination of the cooling / heating mode is reversed, and there is a problem that proper air conditioning cannot be performed.

Therefore, an object of the present invention is to provide a cooling / heating determination method for an air conditioner which can accurately determine the cooling / heating mode by devising the water temperature detection timing by the water temperature sensor.

[0005]

In order to achieve the above object, the cooling / heating determination method of the present invention uses cold water in the cooling mode and in the heating mode as illustrated in FIGS. 1 and 4. It has a heat exchanger 13 through which warm water flows, and this heat exchanger 13
The water temperature sensor 15 provided in the cold / hot water supply pipe 14a detects the water temperature of the cold / hot water to determine whether it is the cooling mode or the heating mode. Based on the determined mode, the set temperature of the cooling / heating and the room temperature sensor 21 The opening of the control valve 16 provided in the pipe 14a and the fan 12 according to the difference from the room temperature detected by
In the air conditioner for controlling the number of rotations, after the operation is started, the control valve 16 is forcibly opened at the predetermined number of times n for the first set time T1 and every second set time T2. Characterize. When the thermo-off state continues for the third set time T3 or more after the predetermined number of times n, the fourth
It is also possible to forcefully open the control valve 16 for the set time T4.

[0006]

According to the cooling / heating determination method of the present invention, for example, when heating is required and when the temperature of the hot water is low immediately after the start of operation, when the water temperature sensor 15 detects this low water temperature, it is determined to be the cooling mode. Then, the opening degree of the control valve 16 and the rotation speed of the fan 12 are controlled in the determined cooling mode. That is, when heating is required, the room temperature is lower than the set temperature, but since the determination result is the cooling mode,
The thermo-off condition continues and the control valve remains closed. Therefore, after the operation is started, the opening / closing valve 16 is forcibly set to the first set time T1 (eg, 90 seconds) and the second set time T2 (eg, 90 seconds, 330 seconds) at a predetermined number of times n (eg, 3 times). Open. As a result, hot water gradually flows through the cold / hot water supply pipe 14a, and the water temperature sensor 15
When the high steady-state water temperature is detected, the heating mode is determined again, and the control valve 16 and the like are controlled in the determined heating mode. Even after the predetermined number of times n, the thermo-off state remains in the third set time T3 (for example, 30
When it continues for more than a minute, the control valve 16 is forcibly opened for the fourth set time T4 (for example, 90 seconds). As a result, even if the heating mode is switched to after a long time from the start of the operation in the cooling mode, hot water is allowed to flow through the pipe 14a, and when the water temperature sensor 15 detects this water temperature, it is determined to be the heating mode. Again, the opening degree of the control valve 16 is controlled in the determined heating mode. When cooling is required and immediately after the operation is started and the water temperature of the cold water is high, even if it is determined to be the heating mode, the cooling mode is determined again in the same manner, and the control valve is set in this determined cooling mode. Etc. will be controlled. As a result, the cooling / heating mode can be accurately determined, and proper air conditioning can be performed.

[0007]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. As shown in FIG. 1, an air conditioner (fan coil unit) 10 includes a box-shaped casing 11, and a fan 12 is arranged in a lower portion of the casing 11.
The heat exchanger 13 is arranged on the upper part thereof.

An air inlet 11a is provided in the lower part of the casing 11, and an air outlet 11b is provided in the upper part of the casing 11. Then, by the rotation of the fan 12, the air sucked from the air suction port 11a is blown out from the air outlet 11b through the heat exchanger 13.

The heat exchanger 13 includes pipes 14a, 14
By b, cold water is passed in the cooling mode, and hot water is passed in the heating mode. A pipe 14a on the cold / hot water supply side of the heat exchanger 13 is provided with a water temperature sensor 15 for detecting the water temperature of the cold / hot water and an electromagnetic control valve 16 for controlling the supply amount of the cold / hot water. ing. The control valve 16 is
As shown in FIG. 2, in the heating mode and the cooling mode,
Opening / closing is controlled within a range of 1 to 2 degrees between the room temperature and the set temperature. Although not shown in FIG. 2, the opening degree of the control valve at the time of opening increases as the absolute value of the difference between the room temperature detected by the room temperature sensor 22 for cooling and heating and the set temperature increases. Further, 17 is an air filter and 18 is a drain pan.

The water temperature sensor 15 and the control valve 16
Is the operation switch 20, the room temperature sensor 21, the fan 12
Together with the fan 12 connected to the control circuit 22.
Is also controlled by the control circuit 22 at a rotational speed according to the absolute value of the difference.

In the above structure, the control by the control circuit 22 will be described with reference to the flowchart of FIG. 3, the opening / closing timing chart of the opening / closing valve 16 of FIG. 4 and the cooling / heating determination timing chart of FIG. When the operation switch 20 is turned on in step S1 to start the operation, for example, when heating is required, conventionally, when the water temperature sensor 15 detects the low water temperature immediately after the operation is started, the water temperature sensor 15 detects the low water temperature. The control valve 16 and the like are controlled in the determined cooling mode. That is, when heating is required, the room temperature is lower than the set temperature, but since the determination is in the cooling mode, the thermo-off state continues and the control valve 16 remains closed. Therefore, after the operation is started, the first set time T is set a predetermined number of times (for example, 3 times).
The second set time T2 (eg 90,3) for only 1 (eg 90 seconds)
The control valve 16 is forcibly opened every 30 seconds. This allows
When hot water gradually flows through the pipe 14a and the water temperature sensor 15 detects a high steady-state water temperature, the heating mode is determined again, and the control valve 16 is controlled in the determined heating mode.

Specifically, in step S2, as shown in FIG. 4, the control valve 16 is set to the first set time T1 at the number of times n (one time).
It is forcibly opened for (t0 → t1: 90 seconds, for example). At the same time, as shown in FIG. 5, the water temperature sensor 15 detects the water temperature of the cold / hot water at a fifth set time T5 (t0 → t1x: 120 seconds, for example) that is longer than the first set time T1. The set time T5 is set longer than T1 in order to correct a time lag before the cold / warm water that has been supplied by opening the valve reaches the water temperature sensor 15.
Then, it is determined whether the mode is the cooling mode or the heating mode, and in step S3, the control valve 16 or the fan 12 is selected according to the determination result mode.
To control the second set time T2 (t1 → t2: 9
Operate normally only for 0 seconds. The fifth set time T5 thereafter is 50 seconds, which is shorter than the first set time T1.

Thereafter, in step S4 of FIG. 3, the number of times n is 3
It is judged whether or not the number of times has reached, and if not, step S2
4, the number of times is cumulatively increased to n + 1 (2 times), and the control valve 16 is set to the first set time T1 (t2 → t3: 90
Seconds) forcibly opening the fifth set time T5 (t
2x → t3x: For example, 50 seconds), the water temperature sensor 15 detects the water temperature of the cold / hot water, determines whether the mode is the cooling mode or the heating mode, and controls the control valve 16 and the fan 12 in step S3 in the mode of the determination result. Then, the second set time T2 (t
3 → t4: for example, 330 seconds) for normal operation.

Thereafter, in step S4 of FIG. 3, the number of times n is 3
It is judged whether or not the number of times has reached, and if not, step S2
4, the number of times is cumulatively increased to n + 2 (three times) and the control valve 16 is set to the first set time T1 (t4 → t5: 90
Seconds) forcibly opening the fifth set time T5 (t
4x → t5x: 50 seconds, for example, the water temperature sensor 15 detects the water temperature of the cold / hot water, determines whether it is the cooling mode or the heating mode, and controls the control valve 16 and the fan 12 in step S3 according to the determination result mode. Then, in step S4 again,
It is determined whether or not the number of times n has reached 3, and if the result is affirmative, the normal operation is continued thereafter (t5 →).

FIG. 6 shows an operation example in which the temperature of the pipe (that is, the temperature of the hot water) rises quickly. In this case, the control valve 15 is forcibly opened for the second time T1 (t2 → t3). )
After that, it will be judged as the heating mode again during
At (t3 →), the opening degree of the control valve 16 is controlled in the heating mode of the determination result.

FIG. 7 shows an example of operation in which the temperature of the pipe rises slowly or an example of switching to the heating mode after a long time from the start of operation in the cooling mode. In this case, after normal operation
Even at (t5 →), the cooling mode remains. Therefore, even after the control valve 16 is forcibly opened a predetermined number of times 3, the thermo-off state remains in the third set time T3 (for example, 30 minutes).
When the above continues, the control valve 16 is forcibly opened for the fourth set time T4 (for example, 90 seconds). As a result, the pipe 14a
When the water temperature sensor 15 detects this water temperature, it is determined again as the heating mode, and the control valve 16 is controlled in the heating mode of the determination result.

Specifically, in step S5 of FIG. 3, the thermo-off state is the third set time T3 (t6 → t) as shown in FIG.
(7: For example, 30 minutes). It is determined whether or not it has continued for more than 30 minutes. If affirmative in step S5, the process proceeds to step S6 and the control valve 16 is set to the fourth set time T4 (t7 → t7 →
t8: Forced opening for 90 seconds, for example, and as shown in FIG. 5, at the fifth set time T5 (t7x → t8x: 50 seconds, for example), the water temperature sensor 15 detects the water temperature of the cold / hot water to determine whether it is the cooling mode or the heating mode. Is determined and the control valve 16 and the fan 12 are controlled in the mode of the determination result to continue the normal operation.

While the normal operation is continued, it is judged in step S5 whether the thermo-off state has continued for the third set time T3 (t8 → t9: for example, 30 minutes).
In step S6, the control valve 16 is set to the fourth set time T4 (t9 →
The water temperature sensor 15 detects the water temperature of the cold / warm water at the fifth set time T5 (t9x → t10x: 50 seconds, for example) by forcibly opening for t10: 90 seconds, for example. In the example shown in FIG. 7, the fourth set time T4 in which the control valve 16 is forcibly opened.
Since the heating mode is determined again during (t9 → t10), the opening degree of the control valve 16 is controlled in the heating mode of the determination result after that (t10 →).

Although the above description is about the case where the heating is required, when the cooling is required or when the temperature of the cold water is high immediately after the start of the operation, the heating mode is determined in the same manner. Then, the control valve 16 is controlled again in the determined cooling mode, and the control valve 16 is controlled in the determined cooling mode. Therefore, according to the above determination method, the cooling / heating mode can be accurately determined, and proper air conditioning can be performed.

[0020]

As is apparent from the above description, the cooling / heating determining method for the air conditioner according to the present invention has a predetermined number of times after the operation is started, and the first setting time is set every second setting time. Since the control valve is forcibly opened, cold water or hot water is gradually passed through the pipe, and when this water temperature is detected by the water temperature sensor, the mode is judged again and this judgment is made again. Since the on-off valve is controlled in this mode, the cooling / heating mode can be accurately determined and proper air conditioning can be performed. Also, even after the predetermined number of times,
When the thermo-off state continues for the third set time or longer, the control valve is forcibly opened for the fourth set time. Therefore, it seems that the cooling / heating mode is switched after a long time has passed from the start of operation. Even in such a case, cold water or hot water is allowed to pass through the pipe, and when this water temperature is detected by the water temperature sensor, the mode is determined again, and the control valve is controlled in the mode determined again. Therefore, as long as the thermo-off state continues for the third set time or longer not only immediately after the operation is started but also during operation, the cooling / heating mode is continuously determined, so that the determination of the cooling / heating mode can be accurately made, and more appropriate air conditioning can be performed. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an air conditioner according to the present invention.

FIG. 2 is a diagram showing a relationship between a difference between room temperature and a set temperature and an open / closed state of a control valve.

FIG. 3 is a flowchart showing an example of a cooling / heating determination process of the present invention.

FIG. 4 is a timing chart showing an example of an open / closed state of the control valve of the present invention.

FIG. 5 is a timing chart showing an example of a cooling / heating determination period of the present invention.

FIG. 6 is a diagram showing an operation example in which the pipe temperature rises quickly.

FIG. 7 is a diagram showing an operation example in which a rise in pipe temperature is slow.

[Explanation of symbols]

10 ... Air conditioner, 12 ... Fan, 13 ... Heat exchanger,
14a, 14b ... Piping, 15 ... Water temperature sensor, 16 ... Control valve, 20 ... Operation switch, 21 ... Room temperature sensor, 22
... control circuit, T1 to T4 ... set time.

Claims (2)

[Claims] 1. A heat exchanger (13) through which cold water is passed in a cooling mode and hot water is passed in a heating mode, and a cold / hot water supply pipe (14a) of the heat exchanger (13). The water temperature sensor (15) provided in the unit detects the temperature of cold / hot water to determine whether it is the cooling mode or the heating mode. Based on the determined mode, the set temperature for cooling and heating and the room temperature detected by the room temperature sensor (21) Control valve provided in the pipe (14a) according to the difference in
In the cooling / heating determination method for an air conditioner, which controls the opening of (16) and the rotation speed of a fan (12), a predetermined number of times (n) is set for a first set time after the operation is started.
A cooling / heating determination method for an air conditioner, characterized in that the control valve (16) is forcibly opened every second set time (T2) for (T1). 2. The fourth set time when the thermo-off state continues for a third set time (T3) or more after the predetermined number of times (n).
Cooling the air conditioner according to claim 1, characterized in that the control valve (16) is forcibly opened only for (T4).
Heating determination method.