JPS608410B2 - Air conditioner operation control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a heat pump type air conditioner.

FIG. 1 shows one example of a heat pump type air conditioner.

In the figure, 1' is a heat pump, and 2' is a compressor.
A four-way switching valve 3, a heat source side heat exchanger 4, a throttling device 5 such as a capillary tube, and a water/refrigerant double heat exchanger 6 are connected by a soot pipe 7. 8 is a fan coil unit, and a fan 8a Each chamber 101 is connected to the water/refrigerant double heat exchanger 6 through a water pipe 9.

11 is a pump, and 12 is a room temperature detector.

In this type of air conditioner, during cooling, the four-way valve 3 is switched in the direction of the solid line shown in the figure, and the heat source side heat exchanger 4 and water
The soot double heat exchanger 6 functions as a condenser and an evaporator to supply cold water to the fan coil unit 8, and during heating, the four-way selector valve 3 is switched in the direction of the broken line shown in the figure to perform water/refrigerant double heat exchange. The container 6 functions as a condenser and hot water is supplied to the fan coil unit 8. Conventionally, these heating and cooling operations are performed by controlling the compressor 2 of the heat pump 1 on and off.
The operation is controlled so that the inlet water temperature of the water/refrigerant dual heat exchanger 6 is always within a predetermined temperature range between a set upper limit value and a set lower limit value.

Further, the fan 8a is controlled on and off so that the temperature inside the room io is maintained within a predetermined temperature range. By the way, let the input of compressor 2 be P and water.

When comparing the start-up characteristics of the soot and soot double heat exchanger 6, assuming that the cooling and heating capacity determined from the temperature difference between the water side inlet and outlet and the water flow rate is Q, as shown in Fig. 2, the water side capacity Q increases at the same time. When the compressor 2 is turned on and turned on, it does not start up immediately but slowly, and when the compressor 2 turns off at time FF, it converges to zero relatively quickly. In other words, ``The areas A and B of the shaded part in the figure are A
〉There is a relationship of B. For this reason, in an air conditioner that uses the above-mentioned operation control, the compressor 2, that is, the heat pump 1, is turned on.

When the off period becomes short, there is a drawback that the operating efficiency becomes extremely poor. This invention was made in order to eliminate the drawbacks of the above-mentioned secondary methods. An object of the present invention is to provide an operation control method for an air conditioner that can increase operating efficiency compared to the conventional case by keeping the off state as it is while the room temperature is rising.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows an operation flow diagram when the air conditioner is operated using the operation control method according to the present invention.

While the heat pump furnace is turned on and the air conditioner is operating, water is not supplied. The operation of the heat pump' is continued until the inlet water temperature T of the double heat exchanger 6 falls to the set lower limit value T, and when it reaches the set lower limit value TI, the compressor 2 is turned off and the heat pump' is operated. stop. After the operation of the heat pump Takashi is stopped, "While the room temperature of all the Murogame Qs in which the fan coil units are operating is falling, compression will continue even if the inlet water temperature T exceeds the set upper limit Tu. Even if the heat pump turtle continues to be off without turning on the compressor 2, when the room temperature of at least one chamber of the Murogame crab in which the fan coil unit 8 is being operated starts to rise, the compressor 2 is turned on. The operation of the heat pump is started. This operation control characteristic is shown by the solid line in Fig. 4. In the figure, the conventional operation control characteristic is shown by the broken line. According to this operation control method, the inlet water temperature T is set at the upper limit. Even if the value Tu is exceeded, the compressor 2 is not turned on for tx while the water side capacity Q remains. Compared to the off time, the time increases by almost the same amount as "on." The off cycle becomes longer.In the case of heating operation, while the heat pump is in operation, when the inlet water temperature T rises to the set upper limit value U, the heat pump starts operating. , and after the operation is stopped, while the room temperature of all the rooms 10 in which the fan coil unit Cod is being operated is rising, even if the inlet water temperature T becomes below the set lower limit value TI, the heat pump 1 will not be operated and the heat pump 1 will not be operated. When the room temperature starts to fall, the operation of the heat pump is started.Such operation control can be realized by providing a device as shown in FIG.

In the diagram, Ki 3 is water. 14 is an on/off signal generator for each fan coil unit 8; tatami 5 is a room temperature detector for each room IQ; turtle 8 is an operation mode signal generator for the heat pump. - Outputs whether it is in cooling or heating mode. The unit 75 is an arithmetic and control unit programmed with the operation flow shown in Figure 3, and upon receiving the outputs 13 to 7 above, it sends an "ON. OFF signal" to the compressor 2 of the heat pump 1. In the above explanation, the inlet water temperature of the water medium dual heat exchanger 6 is used as an index, but the outlet water temperature may be used instead.

As described above, "According to this invention," after the heat pump is turned off, the off state is continued as long as the room temperature in each room being cooled has fallen even during fogging operation, and during heating operation Compared to conventional operation control methods, the heat pump's on/off cycles are longer, increasing operating efficiency, and increasing the heat pump's operating efficiency. Power consumption can be kept low.

[Brief explanation of the drawing]

Figure 1 is a soot circuit diagram showing an example of a heat pump type air conditioner; Figure 2 is an explanatory diagram of a conventional operation control method; and Figure 3 is an operation flow diagram for explaining an operation control method according to the present invention. , Fig. 5 shows the heat pump load characteristics and on/off characteristics when the operation control method of this invention is implemented, respectively. It is a block diagram showing an example of the embodiment. In the figure, tatami mat... heat pump, 6... water, cold soot double heat exchanger, 8... fan coil unit. Shows: 3 figures of bamboo blinds, 2 figures, 4 figures of keys, 5 figures of traditional blinds, 6 figures.

Claims (1)

[Claims] 1. In an air conditioner with on/off control that has a heat pump and a fan coil unit connected to the water/refrigerant double heat exchanger of the heat pump and installed in one or more rooms, the above-mentioned conditions shall be applied during cooling and heating operations, respectively. The above heat pump is kept on until the inlet water temperature of the water/refrigerant dual heat exchanger reaches the set lower limit value and set upper limit value, and after the above heat pump is turned off, the room temperature of all the rooms being cooled decreases. 1. A method for controlling the operation of an air conditioner, characterized in that the OFF state is continued while the room temperature of all the rooms being heated is rising.