JPS6219883Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a floor heating system that performs heating using a radiator installed on the floor.
One of the purposes is to improve the start-up characteristics during heating operation.

Conventionally, this type of floor heating system has a refrigeration cycle configured as shown in FIG. That is, between the discharge side and the suction side of the compressor a, a four-way valve b,
A series circuit consisting of a check valve c, an indoor heat exchanger d, a pressure reducer e, and an outdoor heat exchanger f is connected, and a series circuit consisting of a floor radiator g, a pressure reducer h, and a check valve i is connected. A refrigeration cycle was constructed by connecting in parallel with a series circuit consisting of the check valve c, the indoor heat exchanger d, and the pressure reducing device e.

During heating, the refrigerant flows sequentially from the compressor a through the four-way valve b, the floor radiator g, the pressure reducer h, and the check valve i, as shown by the solid arrow in the figure, and from the outdoor heat exchanger f to the four-way valve b. A cycle was formed that went back to valve b and compressor a. Note that the broken arrows in the figure indicate the flow of refrigerant during cooling.

Therefore, in this conventional structure, the high-pressure refrigerant is condensed only in the floor radiator g, and the liquid flows from the gas region as indicated by B-C in the Mollier diagram shown in FIG. It was a condensed work that made full use of all areas. In other words, this is because when looking at the temperature distribution of the floor radiator g, the refrigerant condition varies widely from the inlet side to the outlet side, so the temperature distribution is not uniform, and the feet feel hot on the inlet side. On the exit side, there is an inconvenience that the feet feel cold, and since it is a radiant heating system, it takes a considerable amount of time until the heating effect is felt.

The present invention eliminates the drawbacks found in the conventional floor heating systems mentioned above.

Hereinafter, the present invention will be described with reference to FIGS. 1 to 3 of the accompanying drawings showing one embodiment thereof.

First, the refrigeration cycle will be explained with reference to FIG.

In the figure, 1 is a compressor, and between its discharge side and suction side, a four-way valve 2, a first usage-side heat exchanger 3,
A refrigerant circulation circuit is formed by sequentially connecting the electromagnetic on-off valve 4, the second usage side heat exchanger 5, the pressure reducing device 6, and the heat source side heat exchanger 7 in series. Reference numeral 8 denotes an indoor fan, which forces the heat of the first and second user-side heat exchangers 3 and 5 into the room. Reference numeral 9 denotes a floor radiator disposed on the floor of the room, the inlet side of which is connected between the first user-side heat exchanger 3 and the electromagnetic shut-off valve 4, and the outlet side connected through the check valve 10. and are respectively connected between the electromagnetic on-off valve 4 and the second usage-side heat exchanger 5.

Next, the outline of the electric circuit will be explained with reference to FIG.

In the figure, 11 is a power supply, and operation switch 1
A series circuit consisting of a room temperature detector 14 for detecting room temperature and a relay coil 15a is connected through the sensor 2. Further, various circuits to be described later are connected in parallel with this series circuit. Reference numeral 13 denotes a cooling/heating changeover switch, which has a circuit for driving an indoor fan motor 16 and an electromagnetic on-off valve coil 17 on the cooling side, and a relay contact 15b of the relay coil 15a and a relay contact 19b of a relay coil 19a, which will be described later, on the heating side. Circuits for driving the indoor fan motor 16 and the electromagnetic on-off valve coil 17 are connected through series circuits consisting of the same. In addition, a four-way valve coil 18 is provided on the heating side of this cooling/heating changeover switch 13.
A series circuit consisting of a well-known timer 20, which turns off after a predetermined period of time, and a relay coil 19a are connected in parallel. 21 is a compressor motor, and the relay contact 15c of the relay coil 15a
It is connected to the power source 11 side via. Here, the room temperature detector 14 has a contact for cooling and a contact for heating, and is configured so that the used contact is switched in conjunction with switching of the cooling/heating changeover switch 13.

The operation of the above configuration will be explained.

First, during cooling operation, the operation switch 12 is turned on, and the cooling/heating changeover switch 13 is turned on to the "cold" side. As a result, the relay coil 15a, the indoor fan motor 16, and the electromagnetic on-off valve coil 17 are energized, and the compressor motor 21 is also driven.
Therefore, the refrigerant flows from the compressor 1 to the four-way valve 2, to the heat source side heat exchanger 7, as shown by the broken arrow in FIG.
The cycle flows through the pressure reducing device 6, the second user-side heat exchanger 5, the electromagnetic on-off valve 4, the first user-side heat exchanger 3, the four-way valve 2, and the compressor 1, and well-known cooling is performed. At this time, the check valve 10 is connected to the floor radiator 9.
The flow of refrigerant is regulated to prevent refrigerant from accumulating.

Also, during heating, the operation switch 12 is similarly turned on, and the cooling/heating changeover switch 13 is turned on to the "warm" side.

As a result, the relay coil 15a, the four-way valve coil 18, the timer 20, and the relay coil 19a are energized, and the indoor fan motor 16, the electromagnetic on-off valve coil 17, and the compressor motor 21 are also driven. Therefore, as shown by the solid line arrow in FIG. It flows to the device 6, the heat source side heat exchanger 7, the four-way valve 2, and the compressor 1. At the same time, the flow also flows from the first user-side heat exchanger 3 to the floor radiator 9, and the compressor 1
A return cycle is also formed. The indoor fan 8 is also operated at the same time, and the heat of the first and second user-side heat exchangers 3 and 5 is forced to be convected indoors.

Then, when the set time of the timer 20 has elapsed, the relay coil 19a is de-energized, so the relay contact 19b is opened, and the indoor fan motor 16 and the electromagnetic valve coil 17 are de-energized. , the indoor fan 8 stops, and the electromagnetic on-off valve 4 closes. Therefore, the refrigerant flows from the compressor 1 to the four-way valve 2, the first usage-side heat exchanger 3, the floor radiator 9, the check valve 10, the second usage-side heat exchanger 5, the pressure reducing device 6, and the heat source. It flows to the side heat exchanger 7, the four-way valve 2, and the compressor 1. In other words, it is radiant heating from the floor. Here, the setting time of the timer 20 is preferably a time when the indoor temperature seems to have warmed up appropriately, and is not particularly limited to a certain number of minutes.

Then, when the above-described floor heating is continued and the indoor temperature reaches an arbitrary set temperature, the room temperature detector 14 is turned off, the compressor 1 is stopped, and temperature control is performed. When the room temperature falls, the compressor 1 is again driven by the room temperature detector 14, and the floor heating is performed again. Thereafter, this operation is repeated to adjust the room temperature.

Also, within the time set by the timer 20, the room temperature detector 1
If 4 operates first, indoor fan 8 and compressor 1
each and perform temperature control.

Therefore, especially at the start of heating operation, heating is started by the effects of both the forced convection of warm air by the indoor fan 8 and the radiant heating from the floor radiator 9, resulting in good startup characteristics. , you can quickly get a comfortable heating effect. Furthermore, when the room temperature reaches the desired set temperature, a radiant heating effect from the floor can be obtained, resulting in an ideal head-cooling and foot-heating heating effect. Furthermore, during floor heating, the indoor fan 8 and the electromagnetic on-off valve 4 are de-energized, so power consumption can be reduced. Also, during floor heating, the first and second
Since the user-side heat exchangers 3 and 5 are installed,
A part of the refrigerant is liquefied by the first user-side heat exchanger 3 to make the refrigerant flowing into the floor radiator 9 into a gas-liquid mixed state, and the refrigerant exiting the floor radiator 9 is transferred to the second The utilization side heat exchanger 5 aims to further promote liquefaction. This shows the gas-liquid mixing state within the range B-C in the Mollier diagram of FIG. Therefore, the refrigerant flowing to the floor radiator 9 can be in a gas-liquid mixed state, which reduces the temperature difference between the inlet side and the outlet side, and as a result, the temperature distribution of the entire floor radiator 9 is improved. It becomes almost uniform, providing even more comfort.

In this embodiment, the timer 20 controls the fixed time at the start of heating, but as a means of converting temperature into time, the timer 20 can be used to detect, for example, the surface temperature of the floor radiator 9. Similar effects can be expected even if a temperature detector or a pressure switch that detects that the refrigeration cycle is stabilized is used instead. Further, the first and second user-side heat exchangers 3 and 5 are not limited to separate units, and may be integrated units that share fins, and in short, they only need to be divided in terms of the refrigeration cycle. .

As is clear from the above embodiments, the floor heating system of the present invention includes a compressor, a first user-side heat exchanger, a second
A refrigeration cycle in which a user-side heat exchanger, a pressure reducing device, and a heat source-side heat exchanger are each connected in a ring, and an indoor fan for forcing the heat of the first and second user-side heat exchangers into the room. A heating device is configured, and an electromagnetic on-off valve that is opened for a predetermined time from the start of operation is provided between the first and second user-side heat exchangers, and is installed on the floor in parallel with this electromagnetic on-off valve. The system is equipped with a means for operating the indoor fan for a predetermined period of time from the start of operation.In addition to radiant heating from the floor, at the start of heating operation, the first and second fans are In order to force convection of the heat of each of the user-side heat exchangers (2) using an indoor fan, radiant heating with a slow start-up can be compensated for by the forced convection of each of the first and second user-side heat exchangers. A heating effect with good start-up characteristics can be obtained, and if radiant heating is stable, it can be used as floor heating to provide an ideal head-cold-foot heating effect, further improving comfort. Since the floor radiator is interposed on the outlet side of the exchanger, the refrigerant flowing to the floor radiator can be in a gas-liquid mixture state from the inlet side to the outlet side, and the floor radiator It is possible to achieve a floor heating effect with good overall temperature distribution so that no temperature difference is felt throughout, and the refrigerant that exits the floor radiator passes through the second user-side heat exchanger and is sent to the compressor. Since the refrigerant is returned to its original position, there is no accumulation of refrigerant, and power to the indoor fan and electromagnetic on-off valve is also stopped during floor heating, resulting in a reduction in power consumption.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of a floor heating system according to an embodiment of the present invention, Fig. 2 is a schematic electrical circuit diagram of the same floor heating system, Fig. 3 is a Mollier diagram, and Fig. 4 is a floor heating system showing a conventional example. It is a refrigeration cycle diagram of a heating device. 1... Compressor, 3... First user-side heat exchanger,
4... Solenoid on-off valve, 5... Second user side heat exchanger, 6... Pressure reducing device, 7... Heat source side heat exchanger, 8
...Indoor fan, 9...Floor radiator.

Claims (1)

[Scope of utility model registration request] A refrigeration cycle in which a compressor, a first usage-side heat exchanger, a second usage-side heat exchanger, a pressure reduction device, and a heat source-side heat exchanger are each connected in an annular manner;
The heating device is equipped with an indoor fan for forcing the heat of each of the second user-side heat exchangers into the room, and a predetermined amount of heat is provided between the first and second user-side heat exchangers from the start of operation. A floor heating system that is provided with an electromagnetic on-off valve that is opened for a certain period of time, a floor radiator installed on the floor is connected in parallel with the electromagnetic on-off valve, and further provided with means for operating the indoor fan for a predetermined period of time from the start of operation. .