JPH01302056A - Air conditioner - Google Patents

Abstract

PURPOSE:To inhibit unnecessary high speed operation and excess ventilation for improvement of comfortableness, by calculating a temperature change speed from the start of operation of an indoor heat exchanger up to a setting time, and controlling the operation speed of a compressor and an indoor fan based on this temperature change speed. CONSTITUTION:An operation control means 20 a differential temperature of an indoor heat exchanger 6 between the start of operation and latter time of operation, say, one minute after the operation start based on a control program. When the differential temperature is below 10 deg.C for example, it is considered that the space volume to be air-conditioned, such as a room is larger, and the operation control means 20 controls and inverter-driven compressor 1 and an indoor fan 18 so that they may operate at a required higher speed, thereby starting the subsequent rise of indoor heat exchange temperature ranges from 10 to 25 deg.C, it is considered that the space volume to be air-conditioned is smaller, the operation control means 20 controls the compressor 1 and the indoor fan 18 so that they may operate at a required slow speed, thereby relaxing the subsequent rise of the indoor heat exchange temperature. Furthermore, when the differential temperature exceeds 265 deg.C, it is considered that the operation is abnormal and the control means limits compulsively the maximum value of the input current of the compressor 1 and the indoor fan 18 so that they may operate at a required speed lower than that.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to a heat pump type air conditioner that can freely cool and heat the air conditioner. Concerning an air peace machine improved to control the air peace machine.

(Prior art) ° Conventionally, this type of air conditioner detects the size (capacity) of the air-conditioned space, such as the width of the room and the open/closed status of windows, and adjusts the indoor fan's flow rate based on the capacity of the air-conditioned space. There is no control to reduce the compression capacity of the compressor or the compressor by υJt[l.

(Problem to be solved by the invention) Therefore, when air conditioning is operated in a relatively small room, etc.,
Indoor fans blow too much air, and the air directly hits the human body, causing discomfort.Furthermore, the compressor is operated at full power, wasting electricity, and is not efficient.

The present invention has been made in consideration of the above circumstances, and its purpose is to provide an air conditioner that can improve comfort and save energy.

(Structure of the Invention) (Means for Solving the Problems) In the present invention, the rate of temperature change from the start of operation of the indoor heat exchanger to the set time is influenced by the capacity of the air-conditioned space. This was done based on the fact that when the 8 groups are large, the temperature change rate of the indoor heat exchanger is slow, and vice versa when the capacity of the air-conditioned space is small.

That is, the present invention calculates the rate of temperature change from the start of operation of the indoor heat exchanger to a set time in an air conditioner having an indoor fan attached to the indoor heat exchanger and an inverter-driven compressor, and It is characterized by comprising an operating speed control means for controlling the operating speeds of the indoor fan and the compressor according to the rate of temperature change.

(Function) When the air conditioner starts operating and the outdoor heat exchanger starts operating, the operating speed control means calculates the temperature change rate of the outdoor heat exchanger from the start to the set time. Ru.

Further, the operating speed control means controls the operating speeds of the compressor and the indoor fan to be reduced when the temperature change rate of the indoor heat exchanger is relatively high, while controlling the operating speed of the compressor and the indoor fan to If the speed is relatively low, the operating speeds of the compressor and indoor fan are controlled to be increased.

That is, if the indoor heat exchanger is slow to start up because the room is large and the air conditioning space is large, the operating speed of the compressor and indoor fan can be increased to speed up the start up of the air conditioning operation.

On the other hand, because the room is small and the capacity of the air-conditioned space is small,
When the indoor heat exchanger starts up quickly, the operating speed of the compressor and indoor fan is reduced to reduce the amount of indoor air blowing directly onto the human body, improving comfort.
The operating speed of the compressor and indoor fan can be optimized to reduce power wastage and save energy.

(Example) The following is an actual example of the air conditioner of the present invention shown in Fig.
This will be explained based on FIG.

Figure 1 shows the overall configuration of an embodiment in which the present invention is applied to a radiant panel type air conditioner. In the figure, the refrigeration cycle of this embodiment includes a compressor 1, a four-way valve 2, The chamber 3, the pressure reducer 4, the indoor heat exchanger 6 of the radiant panel 5, and the radiant heat exchanger 7 are sequentially and annularly connected by refrigerant piping 8 to form a closed loop in which refrigerant is circulated.

Also, by switching the four-way valve 2, when the refrigerant is circulated through the refrigeration cycle in the direction of the solid line arrow in Figure 1, heating operation is performed, while when the refrigerant is circulated in the direction of the broken line arrow in Figure 1, cooling operation is performed. It has become.

The compressor 1 is electrically connected to an inverter 9, and is configured to be able to freely control its operating speed.

On the other hand, the radiant panel 5 has a series pipe 1d that connects the indoor heat exchanger 6 to the radiant heat exchanger 7 in series, and a bypass pipe 11 that bypasses the radiant heat exchanger 7, as shown in FIG. A heating two-way check valve 12 and a cooling two-way check valve 13 are respectively installed, and the refrigerant is supplied to the radiation heat exchanger 7 only during heating operation.
The radiant heat exchanger 7 is bypassed during cooling operation.

The radiant panel 5 is constructed as shown in FIG. 2, and the floor-standing panel case 14 has a suction grill 15 at its front and an outlet grill 16 at its bottom, which are connected to both grills 15 and 16. A vertically elongated ventilation passage 17 is formed inside.

An indoor heat exchanger 6 is installed upright in the ventilation path 17, a radiant heat exchanger 7 is placed in front of it in close proximity to the suction grill 15, and an indoor fan is installed behind the indoor heat exchanger 6. 18 is provided at a position facing the blow-off grill 16, and air is ventilated in the direction shown by the white arrow in the figure. Note that the reference numeral 19 in the figure is a heat insulating material.

As shown in FIG. 1, an operation control means 20 is electrically connected to the inverter 9 and the indoor fan 18.
This operation control means 20 controls the operating speed of the compressor 1 via the inverter 9, and also controls the operating speed of the indoor fan 1.
An indoor heat exchanger temperature sensor 21 for detecting the temperature of the indoor heat exchanger 6 is electrically connected to the operation control means 19.

Note that this indoor heat exchanger temperature sensor 21 may be attached to the 8FA heat exchanger 7.

That is, the operation control means 20 reads the temperature of the indoor heat exchanger 6 from the indoor heat exchanger temperature sensor 21 from the start of the heating operation of the air conditioner to the required set time, calculates the temperature increase rate during that time, and calculates the temperature increase rate during that time. The operating speeds of the compressor 1 and the indoor fan 18 are controlled according to the temperature increase rate, and when the temperature increase rate of the indoor heat exchanger 6 is faster than a predetermined value, the capacity of the air-conditioned space is increased. As small,
Comfort is improved by reducing the operating speed of the compressor height 1 and the indoor fan 18 to a required low speed to save the power of the compressor 1, and reducing the amount of air blown into the room to reduce the amount of air blown directly against the human body. The aim is to

On the other hand, when the temperature increase rate of the indoor heat exchanger 6 is lower than the predetermined value, it is assumed that the capacity of the air-conditioned space is large, and the operation control means 20 increases the operating speed of the compressor 1 and the indoor fan 18 to a required high speed. The aim is to speed up the start-up of heating operation.

The operation control means 20 has a built-in control program shown in the flowchart of FIG. 3, and P1 to P11 in the figure indicate the steps of the flowchart, respectively.

That is, the operation control means 20 first determines whether or not the air conditioner has started heating operation at Pl, operates the radiant panel 5 for radiant heating at P2, and turns on the indoor heat exchanger temperature sensor 2 at P3.
1, the temperature TC of the indoor heat exchanger 6 is read out as the indoor heat exchanger temperature Tc1 at the start of the heating operation, and stored in a required memory.

Next, in P4, after a set time has elapsed from the start of heating operation, for example, 1
The indoor heat exchanger temperature sensor 2 detects the temperature of the indoor heat exchanger 6 after a minute.
1 and set this as the indoor heat exchanger temperature TC2 after 1 minute.

Then, in P5, the indoor heat exchanger temperature Tc at the start of operation is
1 and TC2 after 1 minute is the required set value, e.g. 1
Determine whether it is equal to or smaller than 0, that is, whether Tc, -Tc1≦10 holds true, and Y
If ES, proceed to P6; if NO, proceed to P1.

If YES, the room to be air-conditioned is large, the windows are open, and the capacity of the air-conditioned space is large.

Therefore, in this case, the operation command frequency (Hz) of the inverter 9 is increased to the required high frequency in P6, and the operating speed of the compressor 1 is controlled to the required high speed, and the operating speed of the indoor fan 18 is also controlled to the required high speed. control to speed up the start-up of heating operation.

On the other hand, if P5 is No, the room to be air-conditioned is small, and the capacity of the air-conditioned space is small.

Therefore, in this case, in Pl, Tc2-Tc1≦2
Determine whether or not 5 holds true, and if YES, go to P8.
The operation command frequency (Hz) of the inverter 9 is lowered to a required low frequency, the operating speed of the compressor 1 is controlled to a required low speed, and the power of the compressor 1 is saved.
The operating speed of the indoor fan 18 is also controlled to a required low speed to reduce the amount of air blown into the room, thereby reducing the amount of air blown M directly hitting the human body in the room, thereby improving comfort.

If NO at Pl, it is determined that the temperature increase rate of the indoor heat exchanger temperature Tc is abnormal, and control is performed to limit the maximum value of the input current to the compressor 1 at P9.

And P6. After each control is performed in P8 and P9, normal operation is performed in PIO, and ends when heating operation is switched in Pll.

The operation control means 19 configured in this way is built into the indoor controller 22, as shown in the control block diagram of FIG. 4, for example.

As shown in FIG. 4, the indoor controller 22 uses a key reading circuit 24 to read various key operation signals, such as start/stop, output by key operations on a remote controller 23 or a main body operation panel (not shown), and also performs indoor heat exchange. Temperature sensor 21
(See FIG. 1) The indoor heat exchanger temperature Tc detected by Load.

The indoor controller 22 operates the two-way cooling check valve 13 and the two-way heating check valve 12 via the two-way valve drive circuits 28 and 29 in accordance with the various key operation signals read in this way and the room temperature.
(See FIG. 1) are opened and closed as appropriate, and only during heating operation, refrigerant is passed through the radiant heat exchanger 7 of the radiant panel 5 to perform radiant heating.

The operation control means 20 reads the indoor heat exchanger temperature TC.
As already explained, the controller controls the operating speed of the indoor fan 18 via the indoor fan drive circuit 30 according to the control program shown in FIG. It is supposed to be done.

Next, the operation of this embodiment will be explained.

When the air conditioner of this embodiment is operated for heating, the refrigerant circulates in the direction of the solid line arrow in the refrigeration cycle shown in FIG.
In the radiant panel 5, the hot gas refrigerant from the compressor 1 passes through the radiant heat exchanger 7 to perform radiant heating, and further passes through the indoor heat exchanger 6 to heat the air inside the panel casing 14. This warm air is blown into the room from the blow-off grill 16 shown in FIG. 2 by the indoor fan 18 to heat the room.

Then, both indoor heat exchange temperatures Tc and Tc2 of the indoor heat exchanger 6 at the start of this heating operation and after a set time, for example, 1 minute after the start, are detected by the indoor heat exchanger temperature sensor 21 and the heat exchanger temperature detected by the heat exchanger temperature sensor 21. Each is read by the operation control means 20 via the circuit 25.

The operation control means 20 reads the heat exchanger temperature Tc1. The temperature difference (Tc 2 - TCl) of Tc2 is calculated according to the control block diagram shown in Fig. 3, and as shown in Fig. 5, the temperature difference (TC2 - TCl) is, for example, at a point A below the set value of 10°C. In some cases, it is determined that the capacity of the air-conditioned space such as a room is large, and the operating speed of the inverter-driven compressor and indoor fan 18 are controlled to the required high speed, and the subsequent rise of the indoor heat exchanger temperature Tc is controlled. It is made to rise steeply as shown in Fig. 5.

On the other hand, the temperature difference (Tc -7c1) is, for example, 10 to 25
If the temperature is at point B between the set values of °C, the operation control means 2
0, it is determined that the capacity of the air-conditioned space is small, and the operating speed of the inverter-driven compressor and indoor fan 18 is set to the required low speed υJt [lL, and the subsequent indoor heat exchanger temperature C
The rise of the voltage is relaxed as shown in FIG.

Therefore, in this case, the power consumption of the compressor and the indoor fan 18 is saved by the amount of speed reduction, and the amount of indoor air blown by the indoor fan 18 is reduced, reducing the amount of air blown hitting the human body, which improves comfort. You can improve your performance.

Further, if the temperature difference (TCTCl) is at the 0 point exceeding the set value of 25°C, for example, it is determined that there is an abnormality, and the maximum value of the input current of the compressor and indoor fan 18 is set as follows.
It is forcibly limited to a required value lower than this, the operating speeds of the compressor and indoor fan 18 are controlled to the required low speed, and the subsequent indoor heat exchanger temperature Tc is lowered as shown in FIG.

Therefore, according to this embodiment, since the operating speeds of the compressor 1 and the indoor fan 18 are controlled according to the temperature increase rate of the indoor heat exchanger temperature Tc from the start of the heating operation to the set time, the operating speeds of the compressor 1 and the indoor fan 18 are controlled. The capacity of the air-conditioned space ff11. : Can these power consumption ff1ff be adapted? In addition to the indoor fan 18
Since the indoor transportation [1] is reduced, comfort can be improved.

In addition, although the said Example demonstrated the case where this invention was applied to the radiation panel type|mold air conditioner, this invention is not limited to this.

Further, in this embodiment, a case has been described in which the indoor heat exchanger temperature sensor 21 detects the temperature of the indoor heat exchanger 6 and calculates the temperature increase rate, but the present invention is not limited to this. The temperature increase rate may be calculated by detecting the temperature of the indoor heat exchanger 6 using, for example, a room temperature sensor 26 (see FIG. 4).

〔Effect of the invention〕

As explained above, the present invention provides an operation control means that calculates the rate of temperature change from the start of operation of the indoor heat exchanger to a set time, and controls the operating speed of the compressor and indoor fan based on this rate of temperature change. Therefore, the operation of the compressor and indoor fan can be adapted to each layer of the air-conditioned space.

Therefore, according to the present invention, since unnecessary high-speed operation of the compressor and indoor fan is suppressed, the power consumption thereof can be saved, and the excessive air blowing of the indoor fan can be suppressed to improve comfort. can.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of an embodiment of the air conditioner according to the present invention, FIG. 2 is a vertical cross-sectional view of the radiant panel shown in FIG. 1,
3 is a flowchart of the control program of the operation control means shown in FIG. 1, FIG. 4 is a block diagram showing the control system of the embodiment shown in FIG. 1, and FIG. 5 is a flowchart of the control program of the operation control means shown in FIG. It is a graph showing control characteristics. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger, 5... Radiation panel, 6... Indoor heat exchanger, 7... Radiation heat exchanger, 9...Inverter,
18... Indoor fan, 20... Operation control means, 21
...Indoor heat exchanger temperature sensor. Representative Patent Attorney Nori Ken Yudo Uji Hiroshi - 4 Shoulders Q Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an air conditioner that has an indoor fan attached to an indoor heat exchanger and an inverter-driven compressor, the temperature change rate from the start of operation of the indoor heat exchanger to a set time is calculated, and the temperature change rate is adjusted according to this temperature change rate. An air conditioner comprising an operating speed control means for controlling the operating speeds of the indoor fan and the compressor.