JP2002277021A - Temperature controlling method of radiation cooling/ heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of a radiation cooling/heating apparatus capable of cooling/heating a room to a desired temperature in a short time. SOLUTION: The control method of the radiation cooling/heating apparatus sequentially makes decision, in the first place, as to whether an independent operation of convection cooling/heating is to be effected, in the second place, as to whether a combined operation of the convection cooling/heating and radiation cooling/heating is to be effected, and in the third place, as to whether an independent operation of the radiation cooling/heating is to be effected on the basis of the result of temperature detection. Room temperatures according to which the decision of effecting the respective operations is made are set to decrease in the order of the first to the third in cooling operation and to increase in the order of the first to the third in heating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the temperature of a radiant cooling / heating device.

[0002]

2. Description of the Related Art As a conventional radiant cooling and heating device, as shown in Japanese Patent No. 3067775, a device having a convection cooling and heating function by a dehumidifier and a radiant cooling and heating function by a radiation panel is disclosed. It has been known. The temperature control method of the conventional apparatus during cooling determines whether or not to start the convection cooling independent operation first based on the detection result of the room temperature, and after starting the independent operation, prevents condensation on the radiation panel. Therefore, the procedure was shifted to the determination of the dew point temperature. The determination of the dew point temperature is based on the end of the convection cooling alone operation,
The determination of whether or not to start the combined operation of the convection cooling and the radiation cooling is performed.

However, based on the design minimum temperature of the liquid flowing in the radiation panel and the detection results of room temperature and humidity, it is determined whether or not dew condensation occurs.
Combined operation of convection cooling and radiation cooling will be started. For this reason, even though the room temperature is much higher than the cooling user's set temperature, the convection cooling alone with a large cooling capacity ends immediately after the cooling operation, and the combined operation of the convection cooling and the radiation cooling starts. However, since the cooling capacity is smaller than that of the convection cooling alone operation, there is a problem that it takes a long time to lower the room temperature.

[0004] Similarly, during heating, the convection heating alone operation ends immediately after the heating operation, and the combined operation of convection heating and radiant heating starts, so that it takes a long time to increase the room temperature. occured.

[0005]

SUMMARY OF THE INVENTION The present invention has been developed in consideration of the above circumstances, and an object of the present invention is to provide a temperature control method for a radiant cooling / heating device capable of cooling / heating to a desired temperature in a short time. .

[0006]

According to the present invention, a part of a refrigerant circuit is built in an outdoor unit, another part of the refrigerant circuit and a part of a liquid circuit are built in an indoor unit, and a radiation panel of the liquid circuit is arranged on a ceiling. And
The heat of the refrigerant circuit is transmitted to the liquid circuit by the liquid heat exchanger 6 of the indoor unit to produce cold and hot water, and the radiant panel through which the cold and hot water flows performs radiant cooling and heating. A method of controlling the temperature of a radiant cooling / heating device, wherein firstly, a single operation of convection cooling / heating is performed, a second is a combined operation of convection cooling / heating and radiant cooling / heating, and a third is whether or not a single operation of radiant cooling / heating is performed. Determined in order based on the detection results of, the room temperature when performing each operation, and set to gradually lower from the first to third during cooling,
During heating, it is set to be gradually higher from the first to the third.

[0007] The dehumidifier may have a structure for supplementary production of cold water.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1 and FIG.
The radiant panel 5 of the liquid circuit 4 is arranged on the ceiling, and the heat of the refrigerant circuit 2 is transferred by the liquid heat exchanger 6 of the indoor unit 3 to the liquid circuit. 4 for producing cold and hot water, radiant cooling and heating by a radiation panel 5 through which the cold and hot water flows, and convective cooling and heating, auxiliary production of cold water, and humidity adjustment by the dehumidifier 7 of the indoor unit 3.

In the outdoor unit 1, the refrigerant circuit 2 connects two pipes branched from the compressor 8 to a four-way switching valve 9,
After one of the two pipes newly branched from the four-way switching valve 9 is directly extended toward the indoor unit (upper part in the drawing) 3 and the outdoor heat exchanger 10 is connected to the remaining one,
The first capillary tube 11 and the first check valve 12 are connected in parallel. In the indoor unit 3, the first capillary tube 1
A second capillary tube 13 and a second check valve 14 are connected in parallel to a pipe extending from 1, and a heat exchanger 15, a two-way switching valve 16, and a liquid heat exchanger 6 are connected in series with the other end thereof. Another two-way switching valve 17 is connected in parallel to the two-way switching valve 16 and the liquid heat exchanger 6, and then connected to the four-way switching valve 9 described above. The two two-way switching valves are collectively referred to as a cold / hot water production switch 18. Also, two two-way switching valves 1
A refrigerant bypass 19 is connected between the four-way switching valve 9 and the outdoor heat exchanger 10 before branching to 6, 17. The refrigerant bypass 19 includes a two-way switching valve (sometimes called a reheat switch) 20, a reheater 21, a third capillary tube 22, and a second check valve 23 from the outdoor unit 1 toward the indoor unit 3.
Are connected in series in order.

The liquid circuit 4 connects the radiant panel 5, the liquid heat exchanger 6, the two-way switching valve 24, the liquid auxiliary heat exchanger 25, and the pump 26 in order to form a circulation path. The liquid bypass 27 is connected between the two-way switching valve 24 and the liquid heat exchanger 6 from between the auxiliary heat exchangers 25, and a two-way switching valve 28 is provided in the middle of the liquid bypass 27. . The two two-way switching valves 24 and 28 may be collectively referred to as a cold / hot water auxiliary production switch 29.

The indoor unit 3 includes a dehumidifier 7, a liquid heat exchanger 6, a cold / hot water production switch 18, a cold / hot water auxiliary production switch 29, and a computer temperature / humidity control unit (see FIG. 3) 30 as main components. ing. The dehumidifier 7 is a fan 3
1, a heat exchanger 15, an auxiliary liquid heat exchanger 25, and a reheater 21 are arranged in the traveling direction of air. The liquid heat exchanger 6 has a double-pipe structure, in which a liquid flows through an inner pipe and a refrigerant flows through an outer pipe.

The computer temperature / humidity controller 30 sets the minimum temperature of the liquid flowing into the radiation panel 5 in advance, sets a desired room temperature by the user, and further determines the minimum temperature of the liquid and the room temperature. When the user sets the humidity at which dew condensation does not occur, as shown in FIG.
Outputs a drive control signal to the compressor 8, the reheat switch 20, the fan 31, the cold / hot water production switch 18, the cold / hot water auxiliary production switch 29, and the pump 26 by processing a signal inputted from the liquid temperature sensor 33 as needed. It is.

As shown in FIG. 4, the radiant cooling / heating apparatus controls the temperature at the time of cooling. First, the convection cooling is operated independently, the second is the combined use of convection cooling and radiant cooling, and the third is the radiant cooling. Whether or not to perform single operation is determined in order based on the detection result of the temperature and humidity sensor, and if neither operation is performed, the system is stopped, and after performing each operation, the first decision is made again. Returning, the room temperature at which the first to third operations are performed is set to gradually decrease.

If the room temperature is higher than 25.7 ° C., convection cooling is performed alone. When the room temperature is in the range of 25.7 ° C. to 25.5 ° C., when the humidity is higher than 60%, convection cooling is performed alone, and when the humidity is 60% or less, convection cooling and radiation cooling are performed in combination. When the room temperature is in the range of 25.5 ° C. to 25 ° C., when the humidity is 50% or less, the radiant cooling alone is performed. When the humidity is higher than 50%, the radiant cooling is performed. Turn on the switch and perform reheat dehumidification. If the room temperature is lower than 25 ° C., the system is stopped.
Note that the cold / hot water auxiliary production switch 29 is always in the ON state.

More specifically, the first decision is to determine whether or not the room temperature is 25.7 ° C. or less, and if it is not 25.7 ° C. or less, switch on the compressor and the fan and turn on the reheat switch. Is turned off, the convection cooling alone is operated, and the process returns to the first determination again. Room temperature is 2
If the temperature is 5.7 ° C. or lower, it is determined whether the humidity is 60% or lower. If the humidity is higher than 60%, the single operation of the convection cooling is performed in the manner described above. If the humidity is less than 60%, go to the second decision.

The second decision is to determine whether or not the room temperature is 25.5 ° C. or lower. If the room temperature is not 25.5 ° C. or lower, convection cooling is performed in the same manner as described above.
6 is driven to perform radiant cooling, whereby the combined operation is performed. Thereafter, the process proceeds to a determination as to whether to increase or decrease the radiation cooling based on the detection result of the liquid temperature sensor 33. If the temperature is equal to or higher than 19 ° C., the cooling / hot water production switch is turned on to increase the radiation cooling. If the temperature is not 19 ° C. or higher, the cold / hot water production switch is turned off to weaken the radiation cooling. Then, after turning on and off the cold / hot water production switch, the process returns to the first determination again. When the room temperature is 25.5 ° C. or less,
Move on to the third decision.

The third decision is to determine whether the room temperature is below 25 ° C., and if it is below 25 ° C., turn off the fan, reheat switch, cold / hot water production switch, pump and compressor, and turn off the system. And return to the first decision. If the temperature is not 25 ° C. or less, the process proceeds to a determination as to whether the humidity is 50% or less. If it is 50% or less, the fan is turned off to end the convection cooling, the radiation cooling alone is operated in the manner described above, and the radiation cooling is strengthened or weakened.
Finally, return to the first decision. When the humidity is not 50% or less, the radiant cooling is performed in the manner described above, but the convective cooling maintains the previous state. afterwards,
If the liquid temperature is 19 ° C or higher, turn on the cold water production switch to enhance the radiant cooling effect. In addition, turn on the reheat switch to adjust the humidity while preventing the convection cooling from lowering the room temperature. If not, weaken the radiant cooling effect and eventually return to the first decision.

In the control method described above, dew condensation on the radiation panel is prevented by drive control of a pump for flowing liquid (water) into the radiation panel and liquid temperature (water temperature) control by a cold / hot water production switch. By turning off the cold water production switch when the liquid temperature is not higher than 19 ° C., the minimum temperature of the liquid flowing in the radiation panel, that is, the dew point temperature becomes 19 ° C. In other words, it is necessary to set the conditions of the room temperature and the humidity at the time of driving the pump so that the radiant panel does not dew even when the liquid of 19 ° C. flows. When the dew point temperature is 19 ° C. and the room temperature is 25 ° C., it can be read from a psychrometric chart (not shown) that condensation occurs on the radiation panel when the humidity is about 70% or more. The dew point temperature is 18 ° C and the room temperature is 2 ° C.
In the case of 5 ° C., it can be seen that condensation occurs when the humidity is about 65% or more. Therefore, when the dew point temperature is initially set to a ° C., a lower temperature, for example, (a−
1) Assuming that the dew point temperature is guaranteed for dew point, and by controlling the pump not to operate under the temperature and humidity conditions where dew condensation occurs when the liquid having the default dew point temperature flows into the radiation panel, the dew condensation is prevented. No longer occurs.

Specifically, the dew point temperature a ° C. is 15 ° C. ≦ a ≦
Within the range of 19 ° C, 19 ° C ≤ room temperature settable by the user ≤ 3
Within the range of 0 ° C.

As shown in FIG. 5, the temperature control method of the radiant cooling / heating device at the time of heating is as follows. Whether or not to perform single operation is determined in order based on the detection result of the temperature and humidity sensor, and if neither operation is performed, the system is stopped, and after performing each operation, the first decision is made again. Returning, the room temperature at which the first to third operations are performed is set so as to sequentially increase.

If the room temperature is lower than 22 ° C., convection heating is performed alone. When the room temperature is in the range of 22 ° C. to 23.7 ° C., convection heating and radiant heating are used in combination. When the room temperature is between 23.7 ° C and 24 ° C, the convection heating and the radiant heating are used together when the liquid temperature is 36 ° C or higher, and the radiant heating alone operation is performed when the liquid temperature is not 36 ° C or higher. I do. Room temperature is 24 ° C
In the above case, the system is stopped. Note that the cold / hot water auxiliary production switch and the reheat switch are always in the OFF state.

More specifically, the first decision is to determine whether or not the room temperature is 22 ° C. or higher. If the room temperature is not 22 ° C. or higher, the compressor and the fan are turned on to perform the convection heating alone operation, and Return to the first decision. If it is 22 ° C. or higher, proceed to the second decision.

A second decision is to determine if the room temperature is above 23.7 ° C., and if not,
The convection heating and the pump are driven in the manner described above to perform the radiant heating, thereby performing the combined operation, turning on the cold / hot water production switch to enhance the effect of the radiant heating, and then returning to the first determination. When the room temperature is 23.7 ° C. or higher, the process proceeds to the third determination.

The third decision is to determine whether or not the room temperature is higher than 24 ° C. If the room temperature is higher than 24 ° C., the compressor, the fan, the cold / hot water production switch are turned off, and the system is stopped. Return to the decision. The room temperature is 24 ° C.
If not, the process proceeds to the determination as to whether the liquid temperature is 36 ° C. or higher. If the liquid temperature is 36 ° C. or higher, combined operation of convection heating and radiant heating is performed. When the liquid temperature is not higher than 36 ° C., radiant heating is performed, convection heating is stopped while enhancing the effect of radiant heating, and radiant heating alone is performed, thereby returning to the first determination.

The room temperature range set by the user during heating is as follows:
The temperature is 17 ° C. or more and 28 ° C. or less, and the maximum liquid temperature is 30 ° C. or more and 40 ° C. or less.

It should be noted that the present invention is not limited to the above-described embodiment. For example, the numerical values of the temperature, humidity, and liquid temperature described above are merely examples, and other values may be used.

[0027]

According to the temperature control method of the radiant cooling / heating device of the present invention, the room temperature in the case of performing the convection cooling alone operation at the time of the cooling is as follows.
Since it is set higher than the room temperature when performing the combined operation of convection cooling and radiation cooling, the convection cooling alone operation is surely performed until the set room temperature of the combined operation is reached, and then the convection cooling and radiation cooling are performed. Combined operation will be started. Therefore, as the room temperature in the case of performing the combined operation approaches the room temperature set by the user, the time of the single operation of the convection cooling having a high cooling effect becomes longer than before, and the room is cooled to the desired temperature in a short time. Therefore, the transition of the radiation cooling / heating to the stand-alone operation is quickly performed. Similarly, during heating, the time for the single operation of the convection heating with a high heating effect is longer than before, so that the room can be heated to the desired temperature in a short time, and the transition to the single operation of the radiant heating can be made. Done quickly.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a state of a radiation cooling / heating device during cooling.

FIG. 2 is a circuit diagram showing a state of the radiant cooling / heating device during heating.

FIG. 3 is a control block diagram.

FIG. 4 is a flowchart illustrating a temperature control method during cooling.

FIG. 5 is a flowchart illustrating a temperature control method during heating.

[Explanation of symbols]

 Reference Signs List 1 outdoor unit 2 refrigerant circuit 3 indoor unit 4 liquid circuit 5 radiation panel 6 liquid heat exchanger 7 dehumidifier

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuhiro Hasegawa 247-24 Yokamachi, Toyama-shi, Toyama F-term in Nihonkaicho Onn Co., Ltd. (Reference) 3L060 AA05 CC02 DD05 EE11

Claims (1)

[Claims] An outdoor unit (1) incorporates a part of a refrigerant circuit (2), an indoor unit (3) incorporates another part of the refrigerant circuit (2) and a part of a liquid circuit (4), The radiant panel (5) of (4) is arranged on the ceiling, and the heat of the refrigerant circuit (2) is transmitted to the liquid circuit (4) by the liquid heat exchanger (6) of the indoor unit (3) to produce cold and hot water. Radiant panel through which the cold and hot water flows (5)
Radiant cooling and heating, and dehumidifier (7) of indoor unit (3)
A method of controlling the temperature of a radiant cooling / heating device that adjusts convection cooling / heating and humidity according to the first method. Whether or not to perform is determined in order based on the detection result of the room temperature, and the room temperature when performing each operation is set to gradually decrease from the first to the third during cooling, and from the first to the third during heating. A temperature control method for a radiant cooling and heating device, wherein the temperature is set to be gradually higher toward the second position.