JPS634087B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat pump air conditioner, and more particularly to an air conditioner equipped with an indoor unit in which a radiant heat transfer surface is attached to an indoor heat exchanger to improve comfort and save energy. .

Conventional air conditioners have an air-to-air heat exchanger installed in the indoor unit to perform indoor air conditioning such as cooling or heating. Therefore, the temperature distribution in an air-conditioned room varies depending on the speed of the air blown from the indoor unit, the direction of the airflow, the shape of the room, etc. Therefore, countermeasures include increasing the speed of airflow, and starting from near the ceiling when cooling, and from the floor when heating. It was necessary to blow out conditioned air from nearby. However, since furniture and other items were placed on the floor, warm air did not reach far during heating, making it difficult to improve the temperature distribution in the room. As a solution to this problem, floor heating has become popular in recent years because it improves indoor temperature distribution, but it is difficult to put it into practical use because of dew formation during cooling.

The present invention was invented in view of the above, and improves temperature distribution in an air conditioned room as well as heating and cooling operation.
The purpose is to provide an air conditioner that improves comfort and saves energy.

In order to achieve the above object, the present invention attaches a radiant heat transfer face piece of an appropriate area to the air-to-air indoor heat exchanger of an indoor unit, and places this heat transfer face piece in an exposed manner facing indoors to transfer radiant heat indoors. radiates around the unit,
It improves indoor temperature distribution, and in the refrigeration cycle, a radiant heat transfer facepiece is placed upstream of the indoor heat exchanger, thereby saving energy.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 20 is a box of the indoor unit, which has a length from the ceiling 5 to the floor 7. In the center of this box, an air-to-air indoor heat exchanger 1 is arranged in an inclined manner, and on its front and rear surfaces, radiation heat transfer face pieces 2a and 2b having appropriate areas are arranged. , 2b are exposed toward the interiors 21 and 22. Although this heat transfer face piece is not shown, another pair of radiation heat transfer face pieces 3a and 3b are provided. Further, an opening 6 is formed near the upper ceiling of the box body 20, and a louver 17 is arranged in this opening. The lower part of the box body 20 reaches the floor surface 7, and floor panels 8 made of perforated plates of heat insulating material are arranged at appropriate intervals on the floor surface, so that the lower part of the box body 20 reaches the floor surface 7. and a floor space 23 between the floor panel 8 and the floor panel 8 . 10 is a blower installed at the bottom of the box; 4
11 indicates a drain receiver, and 11 indicates a refrigerant pipe. In the figure, solid arrows indicate the direction of flow of cold air during cooling, and dashed arrows indicate the direction of flow of warm air during heating.

Figure 2 shows a refrigeration cycle including an indoor unit with the above structure, 12 a compressor, 13 a four-way valve, 1
4 is an outdoor heat exchanger, 15 is an expansion valve, 1 is the above-mentioned indoor heat exchanger, 2a, 2b and 3a, 3b are radiation heat transfer face pieces 16, 17 are check valves, and each of the above devices is connected to piping as shown in the figure. An air-cooled heat pump cycle is formed. In the figure, solid arrows indicate the direction of refrigerant flow during cooling operation, and dashed arrows indicate the direction of refrigerant flow during heating operation. That is, the cycle is reversed by switching the four-way valve 13 in response to heating and cooling, and during cooling, the refrigerant that flows out of the expansion valve 15 as shown by the solid arrow flows into the indoor heat exchanger 1 via the radiation heat transfer face plates 2a and 2b. It is then sucked into the four-way valve 13 and compressor 12 through the check valve 17, and is then sucked into the other radiant heat transfer surface body 3a, 3.
It does not circulate (act) on b. In addition, during heating, the cycle is reversed by switching the four-way valve 13, contrary to the above, and the refrigerant is transferred to the radiation heat transfer face plates 3a and 3 as shown by the broken line arrow.
b. It flows to the indoor heat exchanger 1, but does not flow to the other radiation heat transfer face pieces 2a and 2b.

The operation of the air conditioner having the above structure will be explained.
During cooling operation, the refrigerant flows through the compressor 12 - four-way valve 13 -
Outdoor heat exchanger 14 - expansion valve 15 - radiation heat transfer facepiece 2
a, 2b - Indoor heat exchanger 1 - Check valve 17 - Four-way valve 13 - The low-pressure low-temperature refrigerant that flows through the compressor 12 and flows out of the expansion valve 15 is radiated into the indoor air in the radiant heat exchangers 2a and 2b. It radiates heat and cools the surrounding indoor air, and the air sucked in from the floor panel 8 by the blower 10 is circulated through the indoor heat exchanger 1 to cool the circulating indoor air, and the cold air is blown into the room from the opening 6 at the top. Cool the room. The direction of the blown air is controlled by a louver 9.

As described above, the refrigerant that exits the expansion valve 15 during cooling first enters the radiation heat transfer face member 2a. That is, since the refrigerant is mostly liquid, the radiation heat transfer surface 2a
Since the refrigerant flow path loss (pressure loss) is small even when the refrigerant flows into the radiant heat transfer surface body 2a, the refrigerant flow path pipe of the radiation heat transfer face member 2a is thin.
Alternatively, it is possible to form a radiation heat transfer surface that can be made thin and long, has a large heat transfer surface, and has a large radiation capacity.
It is also possible to downsize the radiation heat transfer facepiece.

Next, during heating operation, the refrigerant flows as shown by the dashed arrow.
Compressor 12 - four-way valve 13 - radiation heat transfer facepiece 3a, 3
b - Indoor heat exchanger 1 - Check valve 16 - Expansion valve 15 -
The high-temperature refrigerant circulates through the outdoor heat exchanger 14, the four-way valve 13, and the compressor 12, and the high-temperature refrigerant discharged from the compressor 12 radiates heat to the indoor air at the radiation heat transfer surfaces 3a and 3b.
The surrounding indoor air is warmed, and then the indoor air is sucked in from the upper opening 6 by the blower 10 and circulated to the indoor heat exchanger 1. The indoor air is heated by the heat exchanger 1 and turned into warm air from the floor space 23 below. Air is blown into the room through the floor panel 8 at an appropriate wind speed (1 m/s or less) for heating.

As mentioned above, even during heating, the compressor 12
Before entering the indoor heat exchanger 1, the high-temperature refrigerant discharged from the refrigerant first enters the radiation heat transfer face member 3a. That is, the temperature difference between the human body and the radiation heat transfer face member is large, and the radiation ability increases. (If it is placed on the downstream side of the indoor heat exchanger, it will not function as a radiation heat transfer surface because the refrigerant temperature is low.) As explained above, according to the present invention, only the cooling and heating effects of the indoor heat exchanger can be achieved. Instead, radiant heat is used to cool or heat the surrounding air, which improves indoor temperature distribution and improves comfort.Furthermore, since the refrigeration is carried out in one refrigeration cycle, energy savings are also improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of an indoor unit showing an embodiment of the present invention, and FIG. 2 is a refrigeration cycle diagram thereof. 1... Indoor heat exchanger, 2a, 2b (3a, 3b)
... Radiation heat transfer facepiece, 5 ... Ceiling, 6 ... Upper opening, 7 ... Floor surface, 8 ... Floor panel, 9 ... Louver, 10 ... Air blower, 12 ... Compressor, 13 ...
Four-way valve, 14... Outdoor heat exchanger, 15... Expansion valve, 16, 17... Check valve, 20... Box body, 23
...Floor space.

Claims (1)

[Scope of Claims] 1. A radiant heat transfer surface body having an air blowing part and a suction part at the top and bottom of the box body, equipped with an air-to-air indoor heat exchanger and a blower inside, and having an appropriate area exposed toward the room. In an air conditioner equipped with an indoor unit equipped with at least a compressor, an outdoor heat exchanger, an expansion valve, a cooling flow path of a radiant heat transfer facepiece, an indoor heat exchanger, and a heating flow path of a radiant heat transfer facepiece, A refrigeration cycle is formed by connecting the radiant heat transfer surface with piping, and each radiation heat transfer surface is placed on the upstream side of the refrigeration cycle of the indoor heat exchanger according to the cooling/heating operation, and the other radiation heat transfer surface is equipped with a bypass of the refrigeration cycle. An air conditioner characterized by having pipes installed in parallel. 2. The air conditioner according to claim 1, wherein the box has a length extending from the ceiling to the floor, has an opening near the ceiling, and has a lower part connected to a perforated floor panel. harmonizer.