JPH03274346A - Air conditioner - Google Patents

Abstract

PURPOSE:To properly control the humidity after heating-humidifying operation is stopped for preventing dew formation on a wall by a method wherein a humidity detector is provided to detect the relative humidity in a room during and after heating operation, and an arithmetic device is provided, which performs an arithmetic operation to estimate the wall temperature and presence or absence of dew formation according to the data detected by the temperature detector. CONSTITUTION:A compressor 1, four-way valve 2, a room side heat exchanger 3, an expansion valve 4 as a pressure reducing device and an outdoor heat exchanger 5 are connected in order to form a heat pump type refrigerating cycle, and a controller 7 using a microcomputer is equipped on the room side heat exchanger 3. A humidity sensor is provided to detect the relative humidity in a room during and after heating operation, and an arithmetic device of the controller 7 performs an arithmetic operation to estimate dew formation humidity and the wall temperature according to the data detected by the humidity sensor. Then, an operation controller of the controller 7 gives a dehumidifying operation instruction to the refrigerating cycle according to the calculated results.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an air conditioner, and more particularly to an air conditioner that prevents dew condensation on a wall surface after heating is stopped.

(Prior Art) In recent years, with regard to air conditioning technology, there has been a growing demand for all-round comfort from an overall perspective that includes not only temperature but also humidity.

That is, a humidifier is operated in conjunction with heating by a heat pump type air conditioner, fan heater, or other heating equipment.

By the way, although comfort is provided by humidification during heating, after heating is stopped, there is a problem in that dew condensation occurs on the wall surface due to the relative high dew point humidity. In particular, modern buildings have highly airtight interiors, making it difficult for residual moisture to escape.

(Problems to be Solved by the Invention) In buildings and the like where the indoor airtightness is high, there are problems such as dew condensation easily forming on wall surfaces due to residual moisture after heating and humidifying operation.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide an air conditioner that can appropriately control the humidity after the heating/humidifying operation is stopped, prevent dew condensation on the wall surface, and further improve comfort. shall be.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a refrigeration cycle unit that connects a compressor, an indoor heat exchanger, a pressure reduction mechanism, and an outdoor heat exchanger;
This refrigeration cycle unit has a humidifier that is integrated into the refrigeration cycle unit or is provided as a separate unit and operates during heating, and includes a humidity detection means for detecting the relative humidity in the room during heating and after the heating is stopped; The apparatus further comprises: a calculation means for calculating the wall temperature and the presence or absence of dew condensation based on the detection data of the detection means; and an operation control means for giving a dehumidification operation command to the refrigeration cycle unit based on the calculation results of the calculation means. It is characterized by

(Function) According to the air conditioner according to the present invention, the relative humidity in the room is detected in connection with the heating operation, and when the room temperature decreases due to the influence of the outside air temperature after the heating operation is stopped, the wall temperature is detected. Dehumidification operation is automatically performed based on the assumption of the presence or absence of dew condensation. Therefore, the reduction in absolute humidity effectively prevents dew condensation on the wall surface.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows the cycle configuration of a refrigeration cycle unit according to this embodiment. A compressor 1, a four-way valve 2, an indoor heat exchanger 3, an expansion valve 4 as a pressure reducing mechanism, and an outdoor heat exchanger 5 are connected in sequence to constitute a heat pump type refrigeration cycle. The compressor 1 is provided with an inverter control section 6 to enable continuous frequency variable operation control. Further, the indoor heat exchanger 3 is provided with a control device 7 using a microcomputer.

This control device 7 includes a humidity sensor as a humidity detection means for detecting the relative humidity in the room during heating and after heating is stopped;
A calculation means for calculating the dew point humidity and assuming the wall temperature based on the detection data of the humidity sensor, and an operation control means for giving a dehumidification operation command to the refrigeration cycle unit based on the calculation result of the calculation means. There is.

Further, as shown in FIG. 2, a humidifier 8 is installed indoors together with the indoor unit A. This humidifier 8 is provided as a separate unit from the indoor unit A, but is operated in conjunction with the indoor unit A during heating. In addition, humidifier 8
may be integrated into the indoor unit A.

Thus, during heating, when the relative humidity decreases due to a rise in room temperature, the humidifier 8 is operated based on the humidity detected by the humidity sensor.

On the other hand, after the heating operation is stopped, the dew point humidity in the room is calculated by the calculation means based on the temperature and humidity measured by the humidity sensor at the time of the final operation, and the wall temperature is also assumed to prevent dew condensation on the wall surface. be exposed.

The dew condensation prevention effect will be explained in detail with reference to FIGS. 3 and 4. FIG. 3 is an psychrometric diagram showing the relationship between relative humidity and room temperature, and FIG. 4 is a flowchart showing the control action by the control section 7.

In FIG. 3, the indoor temperature at low temperature (point A) moves to point B due to heating. In this state, the relative humidity is low and it is not comfortable for humans. Then, the humidifier 8 is activated to humidify the air. As a result, point B moves to point 0 on the high humidity side. That is, by increasing the relative humidity a to (α+Δα)%, comfort is improved.

On the other hand, after the heating stops, the room temperature usually decreases due to the outside air. When the sealing rate is good, the room temperature shifts from point 0 to point D on the low temperature side, and the dew point temperature at this time increases from the initial point A' to point D. As a result, if the outside temperature is lower than point D, the wall temperature is also likely to be lower than point D, and if left as is, dew condensation will form on the walls and the like.

Therefore, in order to prevent this, the dew point temperature is assumed based on the zero point when the heating is stopped, and if the temperature falls below this point, the air conditioner is operated to dehumidify to remove the moisture in the room. .

The dehumidifying operation is performed according to the flow shown in FIG. That is, after the heating operation ends (step a), the temperature and humidity are detected (step b), and the room temperature T
If a has decreased, the dew point temperature Td is calculated (step C). Next, calculations are performed regarding the assumption of wall temperature and the possibility of occurrence of dew condensation (step d). Regarding the degree of occurrence of dew condensation, for example, the dew point temperature Td-0
The standard temperature is 5°C.

If it is determined that condensation has occurred (YES), dehumidification operation is performed for a certain period of time (612 minutes) (step e),
Return to temperature and humidity detection. Also, no condensation (NO)
If it is determined that this is the case, after a certain period of time (ΔT, minutes) is held (step f), the process returns to temperature and humidity detection.

According to this embodiment, the refrigeration cycle unit automatically performs the dehumidification operation, and by reducing the absolute humidity, dew condensation on the wall surface is prevented. Therefore, the humidity after the heating and humidifying operation is stopped is appropriately controlled, preventing dew condensation on the wall surface and improving the comfort of the - layer.

In the above embodiment, the operation control was performed based on the calculation of the dew point, but as shown in FIG. 5, the operation control may be performed based on the calculation of the relative humidity Φa instead of the dew point.

In addition, although heating was performed using a heat pump type refrigeration cycle unit in the above embodiment, the present invention is not limited to this, and the present invention can also be applied when a humidifier is operated in conjunction with other heaters, such as a stove, fan heater, carpet, etc. is applicable. That is, if there is a cooling-only model, the cooling-only refrigeration cycle unit can be provided with the same function as described above, and it is possible to prevent dew condensation during operation of the heater and humidifier.

Furthermore, if the humidity in the room is not comfortable when the heating operation is stopped, for example, if the humidity is too low, the heater may continue to operate alone to provide comfortable air conditioning.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to appropriately control the humidity after the heating/humidifying operation is stopped, and it is possible to prevent dew condensation on the wall surface, thereby improving the comfort of the - layer.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram showing one embodiment of the present invention;
3 is an psychrometric chart showing the relationship between relative humidity and room temperature; FIG. 4 is a flowchart showing the control action by the control section; and FIG. 5 is a diagram showing another embodiment of the present invention. It is a partial flowchart. DESCRIPTION OF SYMBOLS 1... Compressor, 3... Indoor heat exchanger, 4... Expansion valve, 5... Outdoor heat exchanger, 7... Control device. 1st

Claims (1)

[Claims] A refrigeration cycle unit that connects a compressor, an indoor heat exchanger, a pressure reduction mechanism, and an outdoor heat exchanger, and a humidifier that is integrated into the refrigeration cycle unit or is provided as a separate unit and operates during heating. a humidity detection means for detecting the relative humidity in the room during heating and after the heating is stopped; and a calculation means for calculating the wall temperature and the presence or absence of condensation based on the detection data of the humidity detection means; An air conditioner comprising: operation control means for giving a dehumidification operation command to the refrigeration cycle unit based on the calculation result of the calculation means.