JPS628694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floor heating machine using a refrigerant floor panel distribution system, and its purpose is to save energy.

The structure and operation of a conventional floor heating machine of this type will be explained with reference to FIGS. 1, 2, and 3.

Figure 1 shows a conventional floor heating system. In the figure, 1 is a wall that constitutes a building, 2 is a floor panel installed horizontally inside the building, and is connected to the outside of the building. The system is connected to an installed outdoor unit 3 via refrigerant piping 4.

FIG. 2 is a refrigerant circuit diagram of the same floor heating machine. In the figure, 5 is a compressor, and the floor panel 2, capillary tube 6, and evaporator 7 are successively connected in an annular manner by refrigerant pipes. 8 is a blower for forcing air around the evaporator 7 to undergo forced convection. In addition, the compressor 5,
A capillary tube 6, an evaporator 7 and a blower 8 are provided within the outdoor unit 3.

A cross-sectional view of the floor panel 2 is shown in FIG.
In the figure, 9 is an aluminum plate, and the refrigerant pipe 1
The plywood board 1 is in contact with the heat storage material 11 surrounding the heat storage material 11, and the plywood board 1
It has a structure with 3.

In the above configuration, the operation will be explained next.

The refrigerant discharged from the compressor 5 passes through the refrigerant pipe 10 of the floor panel 2, then sequentially passes through the capillary tube 6 and the evaporator 7, and is sucked into the compressor 5 again, repeating the flow. undergoes a phase change to form a heating cycle. The refrigerant is refrigerant pipe 10
When passing through the heat storage material 11, it is condensed and the heat of condensation is transferred to the heat storage material 11.
However, heat transfer due to natural convection between the aluminum plate 9 and the air in the space used and the aluminum plate 9 increases the temperature of the aluminum plate 9.
The space used is heated by the radiant heat from the outside. Note that due to the presence of the heat insulating material 12, heat transfer to the lower part of the aluminum plate 9 is not performed.

Floor heating using the refrigerant floor panel distribution method as described above has the following advantages:
It has a good energy saving effect with a perceptibly small amount of heat dissipation. However, heat pump heating has an unavoidable drawback, that is, the energy consumption efficiency of the equipment deteriorates as the outside temperature of the building decreases. This point will be further explained with reference to FIG. In this figure, the horizontal axis shows the outside air temperature, and the vertical axis shows the value of COP (coefficient of product), which is a measure of the energy consumption efficiency of equipment, and shows that COP decreases as the outside air temperature decreases. When the temperature falls below To°C, the heat absorption efficiency in the evaporator 7 deteriorates due to the formation of frost on the evaporator 7, and the COP becomes 1 or less.

Therefore, the present invention eliminates the above-mentioned drawbacks and further contributes to energy saving.

The floor heating machine of the present invention will be explained with reference to FIGS. 5, 6, and 7.

FIG. 5 is a refrigerant circuit diagram of the floor heater of the present invention, and the same parts as in FIG. 2 are denoted by the same symbols and explanations will be omitted. Reference numeral 14 denotes a floor panel, which is equipped with an electric heating element 15. Reference numeral 16 denotes a temperature-sensitive resistance element for detecting outside air temperature, which is installed in the outdoor unit 3. The structure of the floor panel 14 is shown in FIG. 6, in which the same parts as in FIG. 3 are denoted by the same reference numerals and their explanations will be omitted.

In the figure, reference numeral 15 is the same as the electric heating element 15 shown in FIG.

FIG. 7 shows a schematic electrical circuit diagram of the floor heating machine of the present invention. In the same figure, 17 is a main switch, an electric motor 5' that operates the compressor 5, an electric motor 8' that operates the blower 8, and a main switch 17. Electric heating elements 15 shown in the figure are connected in parallel, and energization can be switched by a relay contact 18. On the other hand, the temperature-sensitive resistance element 16 and comparison resistor 2 shown in FIG.
According to the magnitude of the potential difference between the relay contact 18 and the electromagnetic coil 18c,
A transistor 22 for controlling ON-OFF is connected. Here, the temperature-sensitive resistance element 16 corresponds to temperature detection means for detecting the outside temperature, and the relay contact 1
8. The electromagnetic coil 18c, the comparison resistor 21, and the transistor 22 correspond to switching means that operates when the outside temperature reaches a set value.

Next, the operation of the above configuration will be explained.

When the main switch 17 is turned on, if the outside temperature is high, the relay contact 18 short-circuits the motor 5' and motor 8' sides, so the compressor 5 and the blower 8 operate, and the refrigerant discharged from the compressor 5 is discharged to the floor. After passing through the refrigerant pipe 10 of the panel 14, the refrigerant sequentially passes through the capillary tube 6 and the evaporator 7, and is sucked into the compressor 5 again, repeating the flow. During this process, the refrigerant undergoes a phase change to complete a heating cycle. Form. Regarding the heat radiation process when the refrigerant passes through the refrigerant pipe 10,
This is exactly the same as that described in the description of the conventional example, so the description will be omitted.

As shown in Fig. 4, when the outside air temperature falls below To℃ and the energy consumption efficiency of the refrigeration cycle, or COP, falls below 1 due to frost formation on the evaporator 7, etc. Since the resistance value of the temperature resistance element 16 becomes large, a high potential is applied to the base of the transistor 22, and as a result, the relay contact 18 is short-circuited to the electric heating element 15 side by excitation of the electromagnetic coil 18c, and the electric heating element 15 is energized. The switching is performed. When the electric heating element 15 is energized and generates heat, the electric heating element 1 in FIG.
The aluminum plate 9 bonded to the aluminum plate 5 is heated, and the inside of the building is heated by heat transfer due to radiation from the aluminum plate 9 and natural convection of air in the space used. Further, the heat generated from the electric heating element 15 is used only to heat the aluminum plate 9 for the heat insulating material 12.

In other words, when the outside air temperature is high and the energy consumption efficiency (COP) of the formed refrigeration cycle is 1 or more, floor heating is performed using the refrigerant distribution method, while on the other hand, when the outside air temperature is low (below To℃), the refrigerant distribution method is used. If the COP of is less than 1, the COP is 1
Underfloor heating will be performed using electric heating elements. In addition, in this example, the energization was switched depending on whether the energy consumption efficiency (COP) of the refrigerant circuit that directly detected the outside air temperature was 1 or more, but the energy consumption efficiency (CO
P.) can be converted from the current value in the electric circuit, such as the compressor current.

As is clear from the above description, the floor heating system of the present invention has a structure in which an electric heating element is disposed on a floor panel to which refrigerant is piped, and a temperature-sensitive resistance element that detects outside air temperature improves energy consumption efficiency (COP). By comparing the magnitudes of , and selectively switching between refrigerant flow and electric heat generation, efficient energy consumption (always a COP value of 1 or more) is achieved, resulting in an excellent energy saving effect.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a floor heating machine using a refrigerant distribution method, Fig. 2 is a refrigerant circuit diagram of a conventional example of the same floor heating machine, Fig. 3 is a cross-sectional view of the floor panel of the same floor heating machine, and Fig. 4 5 is a characteristic diagram showing the relationship between outside air temperature and energy consumption efficiency in the floor heating machine, FIG. 5 is a refrigerant circuit diagram of the floor heating machine according to an embodiment of the present invention, and FIG.
The figure is a sectional view of the floor panel of the same floor heating machine, and FIG. 7 is an electric circuit diagram of the same floor heating machine. 9... Aluminum plate, 10... Refrigerant pipe, 11
... Heat storage material, 12 ... Heat insulation material, 13 ... Plywood board, 14 ... Floor panel, 15 ... Electric heating element, 1
6... Temperature-sensitive resistance element.

Claims (1)

[Claims] 1. A refrigerant circuit having a compressor, an evaporator, a pressure reducer, and a floor panel, an electric heating element circuit having an electric heating element disposed on the floor panel, a temperature detection means for detecting outside air temperature, and a temperature detection means for detecting the outside air temperature. A floor heating machine comprising a switching means for switching from energizing the compressor to energizing the electric heating element circuit when the temperature detected by the means is below a set temperature.