JPS61240052A - Room heating and cooling device - Google Patents

Abstract

PURPOSE:To appropriately carry out the room heating and cooling operation of a fan coil unit by providing a control part which intermittently opens or closes a motor valve at the time of stopping a blower at the time of starting the operation or during the operation. CONSTITUTION:When a morning first operation switch is turned ON during a room heating mode operation, a blower 3 is turned ON for one minute from a point A at which the blower 3 is OFF, and is immediately restored to OFF. On the other hand, a motor valve 7 is opened for two minutes from a point (e), and water flows via a heat exchanger 2, and further is closed for six minutes. Thereafter, the cycle of operations is repeated. The temperature of warm water is detected by a water temperature detecting sensor 8 and a room heating mode is confirmed. After the rise-up operation, the blower 3 continues the room heating operation from a point B (ON), the motor valve 7 is opened from the point (b). When a room temperature detection sensor 10 reaches a set temperature, the blower 3 is turned ON, and the motor valve 7 is closed. Thereafter, while following after the ON-OFF operation of the blower 3, the motor valve 7 is opened and closed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating and cooling system that uses cold and hot water and is installed in a building or the like.

Conventional technology Traditionally, when installing air conditioning equipment in buildings, etc.
The cold/hot water machine that serves as the heat source and the fan coil unit that serves as the terminal device are connected by piping to the indoor side, and this piping connection passes through a main pipe within the piping space of the building, and from this main pipe to each fan coil unit in the room. They are connected by a branch pipe, and this branch pipe is equipped with an electric valve that is opened and closed by an automatic temperature control device. These heating and cooling systems were controlled as follows. In other words, the water temperature detection sensor installed in the branch pipe
When the air temperature sensor switches between cooling and heating modes, and when the room temperature detected by the room temperature sensor installed at the indoor air intake of the fan coil unit reaches the set value, the blower stops operating, and at the same time, Close the electric valve to stop water flow to the fan coil unit, or
Alternatively, the control was such that even if the blower was stopped, water continued to flow to the fan coil unit.

Problems to be Solved by the Invention In the above-mentioned conventional configuration, when water flow is stopped by stopping the blower and closing the electric valve, there are the following problems when starting up, such as first thing in the morning.

In other words, during the heating season, if the water temperature detected by the water temperature sensor installed in the branch pipe is 26°C or higher, heating will be selected, while if the temperature detected by the room temperature sensor is below the arbitrarily set temperature, the blower will not operate. When the temperature exceeds the set temperature, the blower stops, and the electric valve also operates in conjunction with the blower to perform heating while opening and closing water flow to the fan coil unit. If the branch pipe is long, the temperature near the fan coil unit may be lower due to this long branch pipe distance, and this temperature may be lower than 16°C, for example if the room temperature detected by the room temperature sensor is 10°C. In case C, even if you turn on the operation switch and try to heat the room, the water temperature selected for heating by the water temperature detection sensor is 26°C or higher, so the heating mode is selected. Therefore, if the indoor temperature setting is set to 20"C, for example, the detected indoor temperature is 10"C, so the blower will not operate. Also, the electric valve will remain closed, and even if heating operation is to be performed, the air blower will not operate. The water temperature of the branch pipe connected to the indoor temperature,
For example, if the temperature is around 30°C and the water temperature is about the same, around 3°C, the detected water temperature is 26°C.
C or higher, there was a problem in that heating mode could not be activated and cooling operation could not be performed.

Furthermore, in the latter case of the conventional example described above, in which the blower is stopped but water continues to flow to the fan coil unit, the cold water that is constantly flowing through the fan coil unit during cooling will cool the body of the fan coil unit. There were problems such as condensation forming on the surface of the aircraft.

The present invention is intended to solve these conventional problems, and aims to keep the water temperature in the piping almost constant during the initial operation and during continuous operation of the fan coil unit, and to perform appropriate heating and cooling operations.

Means for Solving the Problems The present invention provides a fan coil unit provided indoors with a heat exchanger and a blower, a cold/hot water machine that supplies cold and hot water to the fan coil unit through piping, and The fan coil unit has an electric valve installed in the input pipe of the fan coil unit, and is provided with a control unit that opens and closes the electric valve intermittently at the start of operation or when the blower is stopped during operation.

Effect: With this configuration, by intermittently passing water through the fan coil unit at the start of operation or when the blower stops during operation, the water temperature detection sensor can detect the temperature of the water flowing through the main pipe. Become.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a fan coil unit, which is provided with a heat exchanger 2 and a blower 3, respectively. Reference numeral 4 denotes a forward main pipe that is installed in a piping space of a building or the like and is connected to a hot/cold water machine (not shown) serving as a heat source, and is provided in parallel with the return main pipe 6. Reference numeral 6 denotes an outgoing branch pipe, which is connected to the fan coil unit 1, and when the operating switch of the fan coil unit 1 is turned on during cooling or heating, it opens and closes intermittently at first (at the beginning of operation), and during cooling or heating. is provided with an electric valve 7 that follows the operation of the blower 3 and opens and closes in response to a signal from a control unit 9. Reference numeral 8 denotes a water temperature detection sensor for detecting water temperature attached to the outgoing branch pipe 6 near the heat exchanger 2, and is connected to the control section 9. Reference numeral 10 denotes a room temperature detection sensor for detecting indoor temperature, which is provided at the suction port of the fan coil unit 1 and is connected to the control section 9 . .

11 is a branch duct.

In the above configuration, when a fan coil system is installed in a building, Daisei Mansicon, etc., the operation switch of the fan coil unit 1 is turned on to perform heating. During this heating process, when the first operation switch is turned on in the morning at the beginning of the day, the blower 3 is turned on as shown in Figure 2.
From point A, which is FF, it turns on for 1 minute and then turns off immediately.
Return to - The blade type valve 7 is operated at the same time as the operation switch is turned on.
Point A remains open for 92 minutes, and the water in the outgoing pipe 4 flows through the outgoing pipe 6.
It flows through the heat exchanger 2 and the branch pipe 11, and then it is closed for another 6 minutes, opened for another 2 minutes, and closed for another 6 minutes. By repeating this, the temperature of the hot water flowing through the outbound pipe 4 will be
The water flows through the outgoing branch pipe 6 to the heat exchanger 2, and its temperature is detected by the water temperature detection sensor 8 to confirm that it is in the heating mode. In other words, due to this intermittent operation, main pipes 4 and 6
Let the hot water of the fan coil unit 1 side and the hot water of the fan coil unit 1 side have approximate temperatures. Then, the blower 3 is continuously operated and the electric valve is continuously opened. In short, at the first rise in the morning, Ojokan 4
In this case, the water is high temperature, but because the branch pipe 6 is long near the heat exchanger 2, the temperature is low, and the water is in cooling mode.
The electric valve 7 is opened and closed intermittently, and the water temperature detection sensor 8 detects the hot water temperature of the return pipe 4, thereby preventing the cooling mode and accelerating the start-up. Next, after the start-up operation of the first adjustment, as shown in FIG. 3, the blower 3 continues heating operation from point B, and the (ON)%
It is also open from four points. Then, when the room temperature detection sensor 1o reaches the set temperature, the blower 3 is turned off and stopped, and the electric valve 7 is closed.After this, the electric valve 7 opens and closes while following the ON-OFF state of the blower 3.

Therefore, when the blower 3 is stopped for a long time by the room temperature detection sensor 1o, the electric valve 7 is operating intermittently in the vicinity of the heat exchanger 2, so the water temperature in the recirculation pipe 4 is sensed.

This also applies to air conditioning operation during the cooling season, especially in the middle of the season, when the air conditioner switches to cooling mode even though it wants to heat the air, and it never switches to heating mode even though it wants to cool the air conditioner. .

Effects of the Invention As described above, the present invention provides a water temperature detection sensor near the inlet pipe of the fan coil unit, a room temperature detection sensor at the suction port in the main body, and an electric valve in the piping, thereby making it possible to operate the fan coil unit. The electric valve is operated intermittently from the moment the switch is turned on, and the electric valve is operated intermittently from the moment the blower stops during continuous operation. The water temperature can be detected properly, for example, when the system goes into cooling mode when trying to heat the room,
Or, when trying to cool the air conditioner, it does not go into heating mode, or when the blower is stopped during cooling,
Since cold water is not constantly passed through the heat exchanger, it is effective in eliminating dew condensation on the surface of the fan coil unit.

[Brief explanation of the drawing]

Fig. 1 is a partial configuration diagram of an air conditioning system that is an embodiment of the present invention, Fig. 2 is an operational chart of the blower and electric valve during startup, and Fig. 3 is a diagram of the operation of the blower and electric valve during continuous operation. It is a chart diagram. 1...Fan coil unit, 2...
Heat exchanger, 3... Blower, 4... Outgoing tube, 6... Outgoing tube, 6... Outgoing branch pipe, 7
......Electric valve, 8...Water temperature detection sensor, 10...Room temperature detection sensor.

Claims (1)

[Claims] A fan coil unit provided indoors having a heat exchanger and a blower, a water cooler/heater supplying cold and hot water to the fan coil unit through piping, and hot water being supplied to the piping near the inlet pipe of the fan coil unit. It has a water temperature detection sensor that selects one of the heating modes depending on whether cold water is being supplied or not, a room temperature sensor that detects the temperature in the room, and an electric valve installed in the piping. A heating and cooling device having a control section that opens and closes the electric valve intermittently when the blower in operation is stopped.