JP2573361B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an air conditioner that performs air conditioning in consideration of wall surface temperature.

(Conventional technology) Generally, an air conditioner heats while circulating indoor air, so when starting a heating operation when the outside air temperature is low and the indoor temperature is low, the indoor temperature reaches the set temperature and the capacity is controlled. Even when the vehicle is in a running state, the user often feels cold due to cold radiation because the wall surface temperature is still low. In order to solve this, conventionally, for example, an air conditioner equipped with a radiant heat sensor that detects the temperature of the wall surface or floor surface, or a thermoslide at a set temperature for a certain period of time from the start of operation, a higher control operation An air conditioner to perform has been proposed.

(Problems to be Solved by the Invention) However, such an air conditioner requires a special provision of a radiant heat sensor for detecting the temperature of a wall surface or the like, and has a disadvantage that the manufacturing cost is extremely high. Also,
Without the radiant heat sensor, in the case of operation control that simply slides the set temperature higher for a certain period of time from the start of operation, if the outside air temperature is somewhat high, the heating capacity should be increased unnecessarily. As a result, there is a problem that power consumption is greatly increased.

The present invention has been made in consideration of the above circumstances, and has as its object to provide an air conditioner that realizes high comfort at low cost.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a timer means for measuring time from the start of operation,
Calculating means for calculating the indoor wall surface temperature from the outdoor temperature detected by the sensor, the indoor temperature, and the measurement time of the timing means,
Means for controlling the output of the compressor in accordance with the calculated indoor wall surface temperature.

(Operation) In this air conditioner, for example, when the heating operation is started in a state where the outside air temperature is low and the room temperature is low, the calculation place (estimated value) of the room wall temperature at that time is low, and the heating capacity is increased. Since the operation is performed, the room temperature and the wall surface temperature rise rapidly, and it is possible to shorten a period in which the skin feels cold due to the cold radiation from the wall surface. Similarly, during the cooling operation, the period during which the user feels the heat due to the warm radiation from the wall surface can be shortened.

Furthermore, since the time from the start of operation is added to the calculation of the wall surface temperature, the wall surface temperature obtained as a result of the calculation is such that the response delay of the wall temperature change with respect to the room temperature change is compensated,
By controlling the output of the compressor in accordance with the calculated wall surface temperature, an air-conditioning operation that reliably compensates for radiant heat from the wall surface becomes possible.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows the basic configuration of the air conditioner of the present invention. In the refrigeration cycle of the air conditioner, a compressor, a four-way valve 2, an outdoor heat exchanger 3, a decompression device 4, and an indoor heat exchanger 5 are sequentially connected to each other to form a refrigeration cycle. 6 is an outdoor fan and 7 is an indoor fan. Switching between cooling and heating is performed by the four-way valve 2, and when the refrigerant flows in the direction of the dashed arrow, a heating operation state is set.

The control device 10 includes a room temperature controller 8 and a controller 9.
The room temperature controller 8 is configured to set a room temperature (set temperature Ts) as a target value.
Is usually set for the indoor temperature sensor 12.
Is compared with the set temperature Ts, and the difference is given to the control unit 9. The control unit 9 creates a corresponding operating frequency command signal of the compressor 1 and supplies it to the inverter device 11. The compressor 1 is rotationally driven by the inverter device 11 at a frequency according to the operation frequency command signal, and the output of the air conditioner, that is, the heating capacity or the cooling capacity is adjusted. Reference numeral 13 denotes an outdoor temperature sensor for detecting the outdoor temperature Tou, which can be specifically constituted by the outdoor heat exchange temperature sensor 14 shown in FIG. 2 or the outdoor sensor 17 shown in FIG.

FIG. 2 shows the configuration of the control device 10 according to the present embodiment. As the outdoor temperature sensor 13, an outdoor heat exchanger 3 or an outdoor heat exchange temperature sensor 14 for detecting the ambient temperature thereof is used. ing. The control unit 9 has a time measuring means for measuring the time from the start of the operation.
15 is the main component, via the relay driver 16,
The compressor 1. The four-way valve 2, the outdoor fan 6, and the indoor fan 7 can be controlled.

The microcomputer 15 determines that the room temperature sensor 12 obtained through the room temperature controller 8 has a detected temperature (room temperature) Ta,
Temperature detected by outdoor heat exchange temperature sensor 14 (outdoor heat exchange temperature) Te
And a function of calculating the indoor wall surface temperature Tw based on the time from the start of the operation by the timing means. Here, as the outdoor heat exchange temperature Te, the temperature detected by the outdoor heat exchange temperature sensor 14 at or immediately before the start of operation is used. An example of the calculation formula of the indoor wall surface temperature Tw is shown below.

Here, t is the time (min) from the start of operation. The above equation (1) indicates that the lower the outside air temperature Tou (in this example, the outdoor heat exchange temperature Te) at the start of the heating operation, the lower the wall surface temperature Tw is calculated. ing. Further, at the beginning of the heating operation, since the actual wall temperature Tw rises later than the room temperature Ta, the calculated wall temperature Tw is changed over time t. The expression (1) is stored in the memory of the microcomputer 15 in advance.

Next, the microcomputer 15 compares the calculated indoor wall surface temperature Tw with the indoor temperature Ta, and according to the polarity of the degree of the difference, according to the following equation (2), Tw <Ta−6 ° C., Tw <Ta −
It also has a function of sliding the room temperature set value Ts to the actual room temperature control set value Tsc in four regions of 3 ° C., Tw ≧ Ta−3 ° C., Tw ≧ Ta + 1 ° C.

Tsc = Ts + △ T (2) Here, Tsc is an actual room temperature set value, which is obtained by calculation.

Ts is a room temperature set value, which is input mechanically by a human.

ΔT is the correction temperature, which is obtained from the table in FIG.

The table shown in FIG. 3 is stored in advance in the memory of the microcomputer 15 as data or as a part of a program. In any case, the microcomputer 15 calculates the actual room temperature set value obtained by the above equation (2).
Based on Tsc, the capacity of the compressor 1 is controlled to increase or decrease.

 The operation of the above configuration will be described with reference to FIG.

When the heating operation is started (step 7.1), the microcomputer 15 reads the detected temperature Te of the outdoor heat exchange temperature sensor 14 and the indoor temperature Ta at or immediately before the heating operation is started, and calculates the indoor temperature by the above equation (1). Is calculated (Step 7.2). Next, the calculated wall surface temperature Tw
In order to determine which of the tables in FIG. 3 belongs to, whether the wall surface temperature Tw is lower than Ta-6 ° C., Ta-3 ° C., and Ta + 1 ° C. is sequentially checked (steps 7.3 to 7.5). ).

First, check whether Tw <Ta-6 ° C (Step 7.
3) If Yes, the actual room temperature control set value Tsc is set higher than the room temperature set value Ts by ΔT = 2 ° C., and Tsc = Ts +
Slide to 2 ° C (step 7.6). Tw ≧ Ta-6 ℃
Then, it is checked whether Tw <Ta−3 ° C. (step 7.4), and if yes, the actual room temperature control set value Tsc
△ T = 1 ° C. higher than the room temperature set value Ts, and Tsc
= Ts + 1 ° C (slide 7.7). Tw ≧ Ta
If −3 ° C., it is checked whether Tw <Ta + 1 ° C. (Step 7.5). If Yes, Tsc = Ts ° C. and the slide amount is set to zero (Step 7.8). If No, that is, Tw ≧ Ta + 1.
If so, the actual room temperature control set value Tsc is lowered by ΔT = 1 ° C. from the room temperature set value Ts, and the temperature is slid to Tsc = Ts−1 ° C. (step 7.9).

Now, when the temperature difference at the start of heating is large, Tw <Ta−
Suppose it was 6 ° C. The judgment in step 7.3 is Yes,
Slide to Tsc = Ts + 2 ° C. (step 7.6). Next, the microcomputer 15 compares the stepped actual room temperature control set value Tsc with the room temperature Ta (step 8.0), and controls the output of the compressor 1 according to the temperature difference. That is, the room temperature Ta is the actual room temperature control set value.
If it is still lower than Tsc, the process proceeds to step 8.1, in which the compressor 1 is rotationally driven at a rotation frequency corresponding to the temperature difference to increase the heating capacity.

The program returns to the beginning, steps 7.1-7.3,7.6,8.0
repeat. Eventually, both the room temperature Ta and the calculated wall surface temperature Tw rise, but the rise in the room temperature Ta is more remarkable. Here, if the temperature falls within the range of Ta−6 ° C. ≦ Tw <Ta−3 ° C., the determination in step 7.4 becomes Yes, and Tsc = Ts + 1 ° C.
(Step 7.7). The room temperature control set value Tsc is compared with the room temperature Ta (step 8.0), the compressor 1 is rotated at a rotation frequency according to the temperature difference (step 8.1), and the operation continues with the heating capacity increased. Is done.

Next, when the temperature falls within the range of Ta−3 ° C. ≦ Tw <Ta + 1 ° C., the determination in step 7.5 becomes Yes, and the temperature is returned to Tsc = Ts ° C. (step 7.8). Therefore, through steps 8.0 and 8.1, control of temperature adjustment is performed based on the same room temperature set value Ts as usual. Here, the compressor 1 returns from the operation state in which the heating capacity is increased to the normal operation state.

The room temperature Ta falls within a range of Tw ≧ Ta + 1 ° C. due to inertia. In order to reduce the overshoot at the rising edge and to eliminate wasteful power consumption, at step 7.5, Tw ≧ Ta + 1
When it is determined that the temperature is C, the slide is performed to Tsc = Ts-1C (step 7.9). Therefore, the judgment in step 8.0 is No
And the compressor 1 is turned off (step 8.2). FIG. 5 exemplifies how the indoor temperature Ta rises by the above control, and the curve A in FIG.
It shows the case of ° C.

According to the above configuration, since the wall surface temperature where the outside air temperature is low is detected to be low during the heating operation, the temperature set value is slid upward and the chill due to the cold radiation from the wall surface is compensated. Accordingly, an air conditioner that can control the entire room temperature to a higher level and has high comfort is provided. In addition, since it has a wall surface temperature calculation function, there is no need for a structure for a wall surface temperature sensor and the like, so that the structure of the entire set can be simplified and cost can be significantly reduced. Further, when the wall surface is somewhat warm, the step of the temperature set value acts on the minus side, so that unnecessary heating is not performed, and the energy saving effect is increased. In addition, since the time from the start of operation is added to the calculation of the wall surface temperature, the rise of the room temperature Ta becomes steep,
The rise of the room temperature can be shortened. This is because the high-output operation state of the compressor 1 continues for a long time when the heating is started.

Although the above description has been given of the case of heating, the operation in the case of cooling is also the same, and the cooling capacity at the start of the operation is increased until the wall surface temperature Tw becomes substantially the same as the room temperature Ta.

FIG. 4 is a block diagram of another embodiment, in which a temperature outdoor temperature sensor 17 for detecting an outdoor atmosphere temperature is used as the outdoor temperature sensor 13 in FIG.

In the above embodiment, the room wall temperature Tw is compared with the room temperature Ta as shown in the table of FIG.
Tw can also be compared with the room temperature set value Ts, and the same effect as described above can be obtained. Further, the present invention can be applied to an air conditioner having no inverter device.

[Effects of the Invention] As described above, according to the present invention, by correcting the set temperature based on the indoor temperature and the outdoor temperature, cold radiation from the wall surface,
The room temperature can be controlled in consideration of heat radiation, and an air conditioner with high comfort can be provided. In addition, the effects of cold radiation and heat radiation from the wall surface can be indirectly detected based on the indoor temperature and the outdoor temperature, eliminating the need for a configuration such as a wall surface temperature sensor.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of an air conditioner of the present invention, and FIG.
FIG. 3 is a control block diagram according to the first embodiment of the present invention. FIG. 3 is a diagram showing a slide amount of the temperature control set value.
FIG. 5 is a control block diagram showing a second embodiment, FIG. 5 is a characteristic diagram showing room temperature changes controlled by the embodiment of the present invention in comparison with a conventional case, and FIG. It is a flowchart figure which shows the outline | summary of operation frequency control. In the figure, 1 is a compressor, 8 is a temperature control unit, 9 is a control unit, 10 is a control device, 11 is an inverter device, 12 is an indoor temperature sensor,
13 is an outdoor temperature sensor, 14 is an outdoor heat exchange temperature sensor, 15 is a microcomputer, 16 is a relay driver, and 17 is an outdoor temperature sensor.

Claims (1)

(57) [Claims] An air conditioner provided with a control device for controlling an output of a compressor, comprising an indoor temperature sensor and an outdoor temperature sensor, wherein the control device measures time from the start of operation. Calculating means for calculating the indoor wall temperature from the outdoor temperature detected by the two sensors, the indoor temperature, and the time from the start of operation, and controlling the output of the compressor in accordance with the calculated indoor wall temperature. An air conditioner comprising: