JPH0725568Y2 - Air conditioner with radiant panel - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to an air conditioner with a radiant panel, and particularly has a radiant panel, and stops the fan or rotates at the lowest speed during radiant heating operation. In an air conditioner with a radiant panel, the air conditioner with a radiant panel for low noise radiant heating operation by the radiant panel and an indoor heat exchanger.

(Prior Art) In recent years, an air conditioner equipped with a radiation panel is known.

This radiant panel is located on the inlet side of the indoor heat exchanger during the heating operation, and exerts the heating capacity either alone or in combination with the indoor heat exchanger during the heating operation.

(Problems to be solved by the invention) By the way, in this kind of air conditioner, the radiant heating operation in which the indoor fan is stopped or rotated at an extremely low speed and the noise countermeasure is prioritized is performed. The indoor heat exchanger is maintained at a high temperature and the indoor heat exchanger is maintained at a high temperature to maintain the indoor temperature at a constant temperature by the radiant heat effect of the radiation panel and the natural convection heat exchange by the indoor heat exchanger.

In this low noise radiant heating operation, when the indoor fan is stopped, the heat exchange amount of the indoor heat exchanger becomes insufficient, so the indoor heat exchanger becomes a large load on the compressor, and the discharge side of the compressor is 25-30 kg / The pressure rises to cm ² .

On the other hand, the operation of the compressor is controlled by the inverter device, and the voltage-frequency pattern in the normal operation of the compressor is set such that the inverter efficiency and the like are the highest even during the blow operation.

Therefore, in this voltage-frequency pattern, when the discharge side of the compressor becomes high in pressure when the fan is stopped as described above, there is a problem that an overcurrent flows through the compressor and the compressor breaks down even at the lowest operating frequency. .

Therefore, the present invention has been devised to effectively solve the above problems.

INDUSTRIAL APPLICABILITY The present invention has a radiant panel, and in a radiant panel-equipped air conditioner that stops the fan or rotates at the lowest speed during radiant heating operation, it is possible to prevent breakdown of the compressor and continue radiant heating operation. An object is to provide an air conditioner with a radiation panel.

[Configuration of the Invention] (Means and Actions for Solving the Problem) The present invention connects a radiant panel between a compressor driven by an inverter device and an indoor heat exchanger having an indoor fan,
During normal cooling and heating operation, the above fan is operated,
In an air conditioner with a radiation panel that stops or rotates the fan at the lowest speed during radiant heating operation, in order to make the minimum operating frequency of the compressor during radiant heating operation higher than the minimum operating frequency of the compressor during normal cooling and heating. The control means is provided, and the operating frequency of the compressor during radiant heating operation is set higher than the operating frequency at which the compressor breaks down.

Embodiment An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a refrigeration cycle of an air conditioner having a radiation panel.

As shown in the figure, a compressor 2 driven by an inverter device 1 is provided, and on the discharge side of this compressor 2, a four-way valve 4, a radiation panel 4, an indoor heat exchanger 5, and a motor 6 are sequentially driven to rotate. The indoor fan 7, the expansion valve 8, and the outdoor heat exchanger 9 are mainly connected to form a refrigeration cycle.

A cooling check valve 10 and a heating check valve 11 are provided between the four-way valve 3 and the indoor heat exchanger 5, and defrosting is performed in a bypass circuit 12 between the compressor 2 and the expansion valve 9. A two-way valve 13 is provided.

Further, during the radiant heating operation, radiant heating by the radiant panel 4 and natural convection heat exchange by the indoor heat exchanger 5 are performed, and during this radiant heating operation, the indoor fan 7 is stopped or is rotated at the lowest speed to perform low noise operation.

For example, when the outdoor temperature is 0 ° C., the radiant heating operation is performed to set the indoor temperature to 10 to 14 ° C., and the indoor fan 7 at this time is operated.
Is driven at, for example, 58 ° C. and controlled to be stopped at 56 ° C.

Therefore, the inverter device 1 that drives the compressor 2 incorporates the voltage-frequency pattern for normal heating and cooling and the voltage-frequency pattern for radiant heating.

Particularly, in the present invention, the control means 14 for making the minimum operating frequency of the compressor 2 during radiant heating operation higher than the minimum operating frequency of the compressor 2 during normal cooling and heating is connected to the compressor 2 and the fan motor 6. The control means 14 is provided so as to detect the radiant heating operation, that is, the indoor fan 7 is stopped or rotated at the lowest speed, and outputs a command to the inverter device 1 to raise the operating frequency above the frequency of the normal operation.

FIG. 2 shows the relationship between the radiation panel temperature, the fan rotation speed, and the compressor frequency.

Conventionally, the minimum operating frequency of the compressor 2 was set to be the same as the minimum operating frequency (28 Hz) during normal cooling and heating even when shifting to radiant heating operation. 2 was breaking down at 28Hz.

Therefore, in the present invention, the minimum operating frequency of the compressor 2 during radiant heating is increased by 1 to 2 steps from the operating frequency during normal cooling and heating operation, and is set to 30 to 35 Hz as in the illustrated example. The compressor 2 does not break down even if the indoor fan 7 stops or rotates at an extremely low speed.

Further, FIG. 3 shows the relationship between the voltage and the frequency of the compressor 2, and during the normal cooling and heating operation, a constant V / F pattern is input to the inverter device 1 from 28 Hz to 95 Hz. During radiant heating, the minimum operating frequency (at ultra-low noise) is set higher than the normal minimum operating frequency, and the maximum operating frequency is set lower than the normal maximum operating frequency.
The rotation of the indoor fan 7 is suppressed as much as possible and low noise operation is performed.

As described above, in the present invention, the minimum operating frequency of the compressor 2 during the radiant heating operation is set higher than the minimum operating frequency of the compressor 2 during the normal operation, so that the breakdown of the compressor 2 can be avoided. Therefore, the radiant panel temperature and the indoor heat exchanger temperature can be maintained at a high temperature, and the low noise heating operation can be performed by the natural convection heat exchange and the radiant heat effect.

Also, the amount of heat exchanged can be increased, and the indoor stable temperature can be raised.

Further, it can be used for fan stop operation of a normal air conditioner.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) Since the minimum operating frequency of the compressor during radiant heating operation is set higher than the operating frequency during normal cooling and heating operation, breakdown of the compressor is prevented, radiant heating operation is continued, and low noise operation is possible. is there.

(2) The amount of heat exchanged can be increased and the indoor stable temperature can be raised.

(3) It can be used for the fan stop operation of a normal air conditioner and is versatile.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of the refrigeration cycle of the present invention, and FIG.
The figure shows the relationship between the radiation panel temperature, the fan speed and the compressor operating frequency, and FIG. 3 shows the relationship between the compressor voltage and the operating frequency. In the figure, 1 is an inverter device, 2 is a compressor, 4 is a radiation panel, and 5 is an indoor heat exchanger. Reference numeral 7 is an indoor fan, and 14 is a control means.

Claims (1)

[Scope of utility model registration request] 1. A radiant panel is connected between a compressor driven by an inverter device and an indoor heat exchanger having an indoor fan so that the fan is operated during normal cooling and heating operation, and the fan is operated during radiant heating operation. In an air conditioner with a radiant panel that is stopped or rotated at the lowest speed, a control means is provided for making the minimum operating frequency of the compressor during radiant heating operation higher than the minimum operating frequency of the compressor during normal cooling and heating operation. An air conditioner with a radiant panel.