JPH0544976A - Air conditioner - Google Patents

Abstract

PURPOSE:To restrain the overshoot of a room temperature with respect to a set temperature by changing the flow rate of hot-water conducted through a heat exchanger. CONSTITUTION:A hot-water circuit is provided with control valves 2, 3 for changing the flow rate of hot-water conducted through a heat exchanger 4. Upon starting operation, the valve travel of these control valves 2, 3 are opened based on a room temperature and a set temperature and when the room temperature has arrived at the set temperature, the control valves 2, 3 are closed to valve travels obtained based on said opening degrees and, thereafter, the valve travel of the control valves 2, 3 are corrected based on the room temperature and the set temperature at every predetermined periods.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention allows hot water to flow through a heat exchanger,
The present invention relates to the control of a flow rate variable valve that changes the flow rate of hot water flowing in a heat exchanger in an air conditioner that performs air conditioning operation by supplying air whose temperature is controlled by the heat exchanger into the room.

[0002]

2. Description of the Related Art As a conventional air conditioner, it has been put into practical use 57-
There was a thing as described in 124040 gazette.

What is described in this publication is "Pump,
In the hot water type air conditioner that blows hot air from the radiator to the room with an indoor blower, a boiler and a radiator are annularly connected to form a hot water heating circuit, and an intermediate portion of the radiator,
It was a hot water air conditioner in which a bypass circuit communicating with the inlet side or the outlet side was provided, and an opening / closing valve that opened when the indoor temperature reached a set temperature was provided in this bypass circuit. "

That is, when the room temperature reaches the set temperature, the heat dissipation capability of the radiator can be reduced by opening the on-off valve to bypass a part of the radiator.

[0005]

In such a conventional air conditioner, the heat radiation capacity of the radiator changes only in two steps, and the heat radiation capacity suitable for the air conditioning load cannot be set.
There is a problem that the fluctuation range with respect to the set value of the room temperature becomes large.

[0006] For example, when the operation is started by maximizing the capacity of the radiator when the room temperature is close to the set value, the room temperature reaches the set value quickly, but even if the capacity of the radiator is reduced, the overshoot of the room temperature thereafter becomes large. It turned out to be.
In order to reduce the overshoot, it is sufficient to set the radiator capacity to "0", but this time a large undershoot occurs.

Particularly, when the capacity of the radiator is changed based on the room temperature and the set value, the room temperature fluctuation is slow, so that the correction for reducing the overshoot is delayed and the room temperature fluctuation range cannot be reduced. ..

In order to solve such a problem, the present invention changes the decrease range of the heat radiation capacity after the room temperature reaches the set value based on the capacity (load size) at the start of operation to prevent the room temperature overshoot. The miniaturized air conditioner is provided.

[0009]

The present invention has a heat source unit for supplying hot water, a heat exchanger through which the hot water flows, and a flow rate variable valve for changing the flow rate of the hot water flowing through the heat exchanger. In an air conditioner that performs air-conditioning operation by supplying air whose temperature is controlled by a chamber, the flow rate variable valve is opened at the opening based on the room temperature and the set temperature at the start of operation, and then the room temperature reaches the set temperature. A control device is provided, which sometimes closes the flow rate variable valve to a predetermined opening degree corresponding to the opening degree at the start of operation, and then changes the opening degree of the flow rate variable valve based on the room temperature and the set temperature every predetermined cycle. ..

[0010]

The air conditioner of the present invention thus constructed is
The opening of the variable flow valve is set based on the room temperature and the set temperature at the start of operation, and the opening of the variable flow valve when the room temperature reaches the set temperature is set based on this opening. ..

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration explanatory view of an air conditioner. In the figure, 1 is a heat source device, 2 and 3 are control valves (variable flow rate valves), 4
Is a heat exchanger installed in the room, 5 is a blower for supplying warm air from the heat exchanger to the room, 6 is a check valve, and 7 and 8 are hot water supplies in which hot water from the heat source device 1 constantly circulates in the building. Piping is used, 9 is a detector for detecting an indoor temperature [hereinafter referred to as TR], 10 is a setter for setting a set temperature [hereinafter referred to as TS], 11 is a detector 9 or a detector 10 This is a control device that changes the opening degree of the control valves 2 and 3 by a signal every predetermined time, for example, every 4 minutes.

This control device 11 is composed of a microcomputer and the like, and if TR> TS at the start of operation of the air conditioner, the control valves 2 and 3 are controlled to be fully closed, and TR <TS-3 (where 3 is 3). 3 ° C.], the control valves 2 and 3 are controlled to be fully opened, and if TS ≧ TR ≧ TS-3, the control valves 2 and 3 are controlled.
If the opening degree of 3 is narrowed from the full opening, for example, if the number of steps of the valve opening is 31, it is controlled to 20 steps.

Further, the control device 11 controls to about ⅔ of the valve opening at this time when TR rises and reaches Ts. For example, if the valve opening is fully opened, the valve opening is controlled in 20 steps corresponding to 31 steps described above, and if the valve opening is 20 steps, the valve opening is controlled in 13 steps. The above-mentioned value of about 2/3 is a value obtained by experiments so as to reduce the TR overshoot, and as shown in FIG. 2, the TR overshoot becomes smaller than that of the conventional TR.

Further, the control device 11 performs the above-mentioned valve control at the start of operation [fully open, that is, control of 31 steps or 20 steps] when Ts is changed.

FIG. 2 is a flow chart showing the operation of setting the opening of the variable flow valve of the control device. First, the operation of the air conditioner is started, and it is determined in step S1 whether the operation is started or the normal operation is started.

When it is determined in step S1 that the operation is started, the room temperature TR and the set temperature TS are set in steps S2 and S3.
Determine the size relationship with. When TR> TS, step S4
If TS ≥ TR ≥ TS-3, go to step S5,
When TR <TS-3, the process proceeds to step S6.

In step S4, the control valves 2 and 3 are fully closed,
In step S5, the openings of the control valves 2 and 3 are set to 20 steps, and in step S6, the openings of the control valves 2 and 3 are set to 31 steps (fully open). Then, in step S7, T
This opening is maintained until S = TR.

When the condition of step S7 is satisfied, step S
8, the process proceeds to step S9 to determine the present opening degrees of the control valves 2 and 3. When the opening degree of the control valves 2 and 3 is 31 steps, the process proceeds to step S10, and when the opening degree of the control valves 2 and 3 is 20 steps, the process proceeds to step S11.

In step S10, the openings of the control valves 2 and 3 are changed to 20 steps, and in step S11, the control valves 2 and 3 are opened.
After changing the opening degree of 13 to 13 steps, the process proceeds to step S12.

In step S12, the opening change amount of the control valves 2 and 3 is calculated every 4 minutes from the difference between the room temperature TR and the set temperature TS and the change amount of the difference, and the opening amounts of the control valves 2 and 3 are calculated. to correct.

FIG. 3 shows the actual change in the room temperature TR and the change in the opening degree of the control valves 2 and 3 (steps). If TR <TS-3 at the start of heating, the control valves 2 and 3 are controlled to be fully opened, as in the conventional case.

However, if TS ≧ TR ≧ TS-3, the control valves 2 and 3 are controlled in 20 steps. Control valve 2, 3
Is controlled to 20 steps, the control valve is fully opened [3
The temperature gradient of TR is smaller than that of the conventional one which is controlled to one step], and therefore the overshoot of TS is reduced.

When hot water is supplied to the heat exchanger 4 and warm air is supplied to the room by the blower 5, TR rises and gradually approaches TS. When TR reaches TS, in the air conditioner of the present invention, the openings of the control valves 2 and 3 at this time are controlled to about 2/3. For example, if the opening degree of the control valves 2 and 3 is fully opened [31 steps], it is controlled to 20 steps, and if the opening degree is 20 steps, it is controlled to 13 steps. As described above, in the air conditioner of the present invention, since the opening degree of the control valve is greatly reduced when TR reaches TS, TR after TR reaches TS
It is possible to reduce the overshoot of TR as compared with the conventional one in which the opening of the control valve is controlled according to the difference between Ts and Ts.

When the room is continuously heated and the set temperature is raised, if TR <TS-3, the opening of the control valves 2 and 3 is controlled to full open [31 steps], and TS
When ≧ TR ≧ TS-3, the opening degrees of the control valves 2 and 3 are controlled to 20 steps. In this way, when the set temperature is changed during heating, the control valves 2 and 3 are fully opened at this time if TR <TS-3, and the control valve is controlled if TS ≧ TR ≧ TS-3. Since the openings 2 and 3 are controlled in 20 steps, the control valves 2 and 3 are controlled as compared with the conventional one in which the opening of the control valve is controlled according to the temperature difference between TR and TS at every predetermined time.
There is an effect that the control of the opening degree of 3 is fast and largely controlled to improve the responsiveness of TR. In the present invention, not only the heat source device but also a cold water supply device 12 for supplying cold water may be provided to cool the room. In this case, the control device may operate as follows.

At the start of cooling, the control device controls the opening of the control valve to be fully closed when TR <TS, and TS + t ≧ TR ≧ TS
In the case of [where t is a predetermined temperature], the opening of the control valve is controlled so as to be narrower than the full opening, and when TR> TS + t, the opening of the control valve is fully opened.

Further, the control device may be any one as long as it controls the opening of the valve at this time when TR decreases and reaches Ts.

In addition, at the time when TS is changed, the control device controls the opening degree of the control valve to be fully opened if TR> TS + t, and if TS + t ≧ TR ≧ TS, the control valve is opened. It is also possible to use a device having a function of controlling the degree of opening to a degree smaller than full opening.

[0028]

As described above, the air conditioner of the present invention is an air conditioner configured to change the flow rate of hot water flowing through the heat exchanger with the variable flow rate valve to change the capacity of the heat exchanger.
Set the opening of the variable flow valve at the start of operation from the room temperature and the set temperature, and when the room temperature reaches the set temperature, after closing the variable flow valve to the opening based on the opening at the start of operation, Since the opening of the flow rate variable valve is changed based on the room temperature and the set temperature at every predetermined cycle, when the air conditioner starts operating, the air conditioner starts to operate with the capacity according to the load in the room and the room temperature overshoot occurs. In addition, when the room temperature reaches the set temperature, the variable flow valve is closed to the capacity corresponding to the load to prevent the room temperature overshoot. Can be done.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of an air conditioner according to the present invention.

FIG. 2 is a flow chart for determining the opening of a control valve according to the present invention.

FIG. 3 is an explanatory diagram showing a relationship between an opening degree of the control valve shown in FIG. 1 and an indoor temperature.

[Explanation of symbols]

 1 Heat Source Machine 2 Control Valve 3 Control Valve 4 Heat Exchanger 7 Piping 8 Piping 9 Detector 10 Setter 11 Controller 12 Cold Water Supply Device

Claims (1)

[Claims] 1. A heat source device for supplying hot water, a heat exchanger through which the hot water flows, and a flow rate variable valve for changing the flow rate of the hot water flowing through the heat exchanger. In an air conditioner that supplies air to the room to perform air conditioning operation, the flow rate variable valve is opened at the opening based on the room temperature and the set temperature at the start of operation, and then the flow rate variable valve is started when the room temperature reaches the set temperature. The air conditioner is provided with a control device that corrects the opening of the variable flow valve based on the room temperature and the set temperature every predetermined cycle after closing to a predetermined opening corresponding to the opening.