JPH0222604Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) The present invention relates to an air conditioning system, and particularly relates to an air conditioning system that incorporates a floor heating panel in a refrigeration cycle.

(Prior Art) As shown in FIG. 1, a conventional heating and cooling system includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer such as a capillary reach tube, 5
is an indoor heat exchanger, and the compressor 1, four-way valve 2, outdoor heat exchanger 3, and indoor heat exchanger 5 constitute a refrigeration cycle during cooling. That is, during cooling, the refrigerant flows from the compressor 1 through the four-way valve 2 to the outdoor heat exchanger 3, as shown by the solid arrow, where the refrigerant is condensed and the pressure is reduced by the pressure reducer 4. Thereafter, it flows into the indoor heat exchanger 5, exchanges heat with indoor air to cool the room, and then returns to the suction side of the compressor 1 through the four-way valve 2.

In this refrigeration cycle, during heating, it is a reverse cycle in which refrigerant flows from the indoor heat exchanger 5.
A floor heating panel 6 is connected in parallel with this indoor heat exchanger 5, and this indoor heat exchanger 5 and the floor heating panel 6 are connected in parallel.
To prevent the refrigerant flowing into the indoor heat exchanger 3 from flowing into the indoor heat exchanger 3,
A check valve 7 is connected to the inlet side of the pressure reducer 4 during heating,
The refrigerant passes through the refrigerant heater 8 and returns to the suction side of the compressor 1 via the solenoid valve 9, and a check valve 10 is provided to prevent the refrigerant from flowing from the refrigerant heater 8 to the four-way valve 2.

Solenoid valves 11 and 12, which can be opened and closed, are connected to the inlet sides of the indoor heat exchanger 5 and the floor heating panel 6 during heating, respectively. The opening and closing of the electromagnetic valves 11 and 12 is performed by the heating control device 22, which inputs an output from a temperature sensor 21 provided in the indoor heat exchanger 5 to the heating control device 22. A check valve 13 is provided on the outlet side of the floor heating panel 6 to prevent the refrigerant from the pressure reducer 4 from flowing into the floor heating panel 6 when the refrigerant is used.
During heating, the refrigerant heater 8 heats and evaporates the refrigerant condensed in the indoor heat exchanger 5 and floor heating panel 6. The heater 8 is heated with a burner 14, etc., and the refrigerant is heated with the heat. . Also, on the suction side of the compressor 1, there is an accumulator 15 for separating gas and liquid.
Also, the outlet side of the outdoor heat exchanger 3 during cooling is connected to the four-way valve 2 via the check valve 16, and leaks from the check valves 7 and 10 during heating, causing the outdoor heat exchanger 3 to leak.
The refrigerant and lubricating oil accumulated in the compressor 1 are recovered to the compressor 1 through the check valve 16.

Note that a valve 17 is appropriately connected to the pipe connection portion on the inlet/outlet side of the indoor heat exchanger 5 and the floor heating panel 6.

To explain the operation of the air conditioning system with the above configuration, during cooling, the solenoid valve of the four-way valve 2 is turned on as shown in Figure 2.
OFF, connect the circuit at the position shown by the solid line in FIG. Turn on the solenoid valve 11 to keep it open. As mentioned above, the refrigerant flows from the compressor 1 through the outdoor heat exchanger 3, the pressure reducer 4, and the check valve 7 to the indoor heat exchanger 5, where it exchanges heat with indoor air, and then passes through the four-way valve 2 to the check valve. 10, is separated into gas and liquid by an accumulator 15, and returns to the compressor 1. In this case, the refrigerant that has exited the check valve 7 from the pressure reducer 4 has the solenoid valve 9 of the refrigerant heater 8 turned off.
In addition, the check valve 13 of the floor heating panel 6 allows the heater 8
and does not flow to the floor heating panel 6. When stopping the cooling operation, the solenoid valve 11 of the indoor heat exchanger 5 is turned on, and the evaporated refrigerant remaining in the indoor heat exchanger 5 is returned to the suction side of the compressor 1 via the solenoid valve 9.

Next, when performing heating operation, first (heating)
The solenoid valve of the four-way valve 2 is turned on, so that the four-way valve 2 shown in FIG. The gas passes through the four-way valve 2 and then the solenoid valve 11.
through the indoor heat exchanger 5 and through the solenoid valve 12 into the floor heating panel 6.
It exchanges heat with indoor air and supplies warm air indoors.
Moreover, the floor heating panel 6 heats the floor of the room. In this case, the amount of heat released by the floor heating panel 6 is calculated from the indoor heat exchanger 5.
The amount of heat dissipated is larger than that of 1, to more effectively cool the head and heat the feet during indoor heating, and improve the rise characteristics of the indoor temperature at the start of heating.

The condensed refrigerant leaving the indoor heat exchanger 5 and the floor heating panel 6 flows into the refrigerant heater 8, where it is heated and evaporated, and returns to the compressor 1 through the solenoid valve 9. In this case, the condensed refrigerant does not flow into the pressure reducer 4 due to the check valve 7, and the evaporated refrigerant does not flow into the four-way valve 2 due to the check valve 10.
It doesn't flow into the water.

In addition, since the amount of refrigerant increases because the refrigerant flows through the floor heating panel 6 and the indoor heat exchanger 5, an accumulator 15 is connected to the suction side of the compressor 1 to prevent pulse pressure of the refrigerant. When evaporated in 3,
Since the heat capacity cannot be sufficiently obtained, it is preferable to heat the refrigerant with a refrigerant heater 8 using a burner 14 or the like as in this embodiment. When the indoor temperature reaches the set temperature [heating], the solenoid valve 11 that flows the refrigerant to the indoor heat exchanger 5 is turned OFF, the valve is closed, and the compressor 1 is closed.
The high-temperature, high-pressure refrigerant is flowed only through the floor heating panel 6 to perform heating operation.

Further, during this heating operation, if the indoor temperature rises further, combustion in the burner 14 of the refrigerant heater 8 is stopped, and at the same time, the compressor 1 is also stopped. When the room temperature drops, the burner 14 is fired again and the compressor is operated.

Moreover, when stopping heating operation and cooling operation, the compressor is stopped and the solenoid valve of the four-way valve 2 and each solenoid valve 9, 11, 12 are turned off.

During heating operation, check valves 7 and 10 are provided to prevent refrigerant from flowing into the outdoor heat exchanger 3.
The check valves 7 and 10 are prone to leaks, and when heating is operated for a long time, part of the refrigerant and lubricating oil mixed in the refrigerant passes through the check valves 7 and 10 and accumulates in the outdoor heat exchanger 3, reducing the amount of refrigerant in the heating cycle. becomes less. Recover the refrigerant accumulated in this outdoor heat exchanger 3 (gas recovery)
To do this, connect the solenoid valve of four-way valve 2 as shown in Figure 2.
Set it to the heating position as the ON state, and each solenoid valve 9, 1
The compressor 1 is operated with 0 and 11 closed. The refrigerant accumulated in the outdoor heat exchanger 3 mainly flows through the check valve 16 and from the other outlet to the four-way valve 2, and is recovered by the compressor 1 via the check valve 10 and the accumulator 15.

(Problem to be solved by the invention) However, in the air-conditioning device having the above-mentioned configuration, when the heating operation is stopped, the flow of the refrigerant stops, but the floor heating panel 6 and the refrigerant heater 8 are in communication with each other. Therefore, when the floor heating panel 6 is stopped, the high-temperature, high-pressure refrigerant that has accumulated in the floor heating panel 6 and the condensed refrigerant that has accumulated in the refrigerant heater 8 try to reach equilibrium, so the high-temperature, high-pressure refrigerant in the floor heating panel 6 condenses, and the floor heating There was a problem with the panel 6 being prone to becoming cold quickly.

The present invention was developed in consideration of the above circumstances, and is an air-conditioning/heating system that can perform heating with a cold head and warm feet, has a good heating start-up when heating starts, and can maintain the warmth of the floor heating panel for a long time even after the heating operation has stopped. The purpose is to provide

[Structure of the idea]

(Means for solving the problem) The air conditioning system of the present invention incorporates a floor heating panel into the refrigeration cycle consisting of a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger. Heats with both an exchanger and a floor heating panel,
A heating control device is provided to heat the room only with the floor heating panel when the room reaches a set temperature, and a refrigerant heater that heats the refrigerant during heating is incorporated into the refrigeration cycle, and the refrigerant of the floor heating panel during heating is installed. It is equipped with a valve on the outlet side that stops the flow of refrigerant when heating is stopped.

(Function) As a result, when heating starts, high-temperature, high-pressure refrigerant flows through both the floor heating panel and the indoor heat exchanger, quickly raising the indoor temperature to the set temperature, and once the set temperature is reached, only the floor heating panel is used. perform heating,
In addition, even when heating is stopped, by closing the valve that stops the flow of refrigerant installed on the refrigerant outlet side of the floor heating panel, a sudden drop in the heating effect is suppressed, and the optimal indoor temperature is maintained with a cold head, a cold foot, and a small amount of heat. Heating can be done.

(Example) Hereinafter, a first example of the air conditioning system according to the present invention will be described with reference to FIG. 3.

Note that the same parts as those shown in FIG.

In FIG. 3, a solenoid valve 18 which can be opened and closed is connected in place of the check valve 13 provided on the refrigerant outlet side of the floor heating panel 6 shown in FIG. 1 during heating. As a result, the refrigerant heater 8 and the floor heating panel 6
Since the solenoid valve 18 shuts off the refrigerant inside the floor heating panel 6, the high temperature and high pressure refrigerant is sealed inside the floor heating panel 6, and even if the heating operation is stopped, the warmth of the floor heating panel 6 is maintained for a long time. can.

FIG. 4 shows another embodiment of the air conditioning system according to the present invention, in which an outdoor heat exchanger 3, a pressure reducer 4, an indoor heat exchanger 5, and a floor heating panel 6 are connected in series to form a refrigeration cycle. configured. In this case, a check valve 19 is connected in parallel with the floor heating panel 6, and an on-off valve 20 is provided on the inlet side of the refrigerant during cooling of the floor heating panel 6, and a check valve 21 is provided on the outlet side. The refrigerant that has passed through the heat exchanger 3, pressure reducer 4, and indoor heat exchanger 5 returns to the compressor 1 side through the check valve 19 connected in parallel, and during heating, the check valve 21 is connected in series. It is configured to flow from the air to the floor heating panel 6, and then to the indoor heat exchanger 5 through the on-off valve 20. In this case, since the on-off valve 20 is provided on the outlet side of the floor heating panel 6, when the heating operation is stopped, this on-off valve 20 is closed to confine the high temperature and high pressure refrigerant gas inside the floor heating panel 6, and the third Similar to the embodiment shown in the figure, the warmth of the floor heating panel 6 can be maintained for a long time.

Also, during heating, the floor heating panel 6 and indoor heat exchanger 5
After the indoor temperature reaches the set temperature, the fan (not shown) of the indoor heat exchanger 5 is stopped, heating by the indoor heat exchanger 5 is stopped, and only the floor heating panel 6 is operated.

[Effect of idea]

As described above, the present invention provides the following excellent effects.

When heating starts, high-temperature, high-pressure refrigerant flows through both the floor heating panel and the indoor heat exchanger to perform heating, which improves the heating start-up effect. After this temperature is reached, heating can be performed from the floor of the room using only the floor heating panel, so the head and feet are cold, and comfortable heating can be performed with a small amount of heat.In addition, the heating that stops the refrigeration cycle when the room temperature reaches a predetermined appropriate temperature Even when the floor heating panel is stopped, the valve installed on the refrigerant outlet side of the floor heating panel that stops the flow of refrigerant is closed to prevent a sudden drop in the heating effect, and the refrigerant heater also prevents changes in outside temperature. Since there is little change in capacity and there is no need for a defrost cycle using the heat pump method, stable floor heating control operation can be performed with little change in indoor temperature during heating operation.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing the conventional configuration of the air conditioning system according to the present invention, Fig. 2 is a diagram for explaining the opening and closing operations of each solenoid valve when operating the air conditioning system of Fig. The figure is a circuit diagram showing an embodiment of the heating and cooling device of the present invention, and FIG. 4 is a circuit diagram showing another embodiment of the heating and cooling device of the invention. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a pressure reducer, 5 is an indoor heat exchanger, 6 is a floor heating panel, 11 and 12 are solenoid valves, 18 and 20 are open/close The valve 22 is a heating control device.

Claims (1)

[Scope of utility model registration request] A floor heating panel is incorporated into the refrigeration cycle consisting of a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger, and when heating starts, both the indoor heat exchanger and the floor heating panel heat the room to the set temperature. A heating control device is installed to heat only the floor heating panel when the heating temperature reaches 100 kW, and a refrigerant heater that heats the refrigerant during heating is incorporated into the refrigeration cycle. A heating and cooling device characterized by being provided with a valve that stops the flow of refrigerant when stopped.