JPS58102043A - Optimum control system of blowoff temperature - Google Patents

Abstract

PURPOSE:To prevent the sense of discomfort from being given to occupants of a room and prevent the disappearance of precooling or preheating effect from occurring by a method wherein the precooling or preheating operation is started at the lowest or highest blowoff temperature and, when room temperature reaches the control temperature, the blowoff temperature is changed to a new blowoff temperature so as to gradually approach to the set temperature in the precooling or preheating operation done prior to the use of air-conditioned space. CONSTITUTION:Room temperatures measured by a room temperature sensor 4 are read into a central processing unit (CPU) 5. After that, the precooling or preheating is descriminated and then the control value, the desired value and blowoff temperature data at previous time are read out of a disc memory 6 and sent to the CPU 5. The CPU calculates the differences between the room temperatures and the control values in order to control an air conditioner 1 through a setting controlling unit 7 so as to obtain specified blowoff temperatures at a blowoff temperature set point 2. In this case, when the difference between the room temperature and control value located before the desired value becomes less than zero, a new blowoff temperature, which is the difference between the room temperature and the blowoff temperature applied by the predetermined weight, is determined in order to blowoff the air with said new blowoff temperature. The operation as just mentioned above to change blowoff temperature is repeated until the blowoff temperature reaches the desired value so as to gradually bring the blowoff temperature close to the desired value. Consequently, the occupants of the room are prevented from being given the sense of discomfort.

Description

[Detailed Description of the Invention] The present invention provides a method for performing precooling or preheating using an air conditioner.
The present invention relates to an optimal control method for the blowout temperature in order to avoid causing discomfort at the end of precooling and preheating.

In the air conditioning of buildings, etc., a method is generally used in which precooling or preheating is performed at night and the temperature is maintained at an appropriate temperature until the beginning of use of the ink amount. In pre-cooling or pre-heating using an air conditioner, initially the capacity of the air conditioner is maximized.
The blowout temperature is set to the lowest during precooling and the highest during preheating, and when the precooling and preheating is completed, the blowout temperature is changed to a predetermined blowout temperature and air conditioning is continued.

FIG. 1 explains the control of precooling and preheating according to the conventional method. In the figure, (&) indicates the case of pre-cooling control,
(b) shows the case of preheating control, with time (1) on the horizontal axis and temperature (°C) on the vertical axis, and the blowout temperature (actual II) and room temperature (1 point chain). II).As seen in the same figure, precooling continues at the lowest or highest temperature from the start of preheating, and the indoor temperature gradually decreases or increases until it reaches the target value. When it approaches, change the blowing temperature to the target value all at once and continue blowing.

However, in the conventional blowout temperature syntrol method, the blowout temperature was controlled only at the start of precooling and preheating and at the end of precooling and preheating, so a sudden change in the blowout temperature occurred before and after the end of precooling and preheating, and Causes discomfort to the human body near the exit.

Furthermore, immediately before the end of 1st precooling and preheating, the area near the air outlet is either too cold or too hot, which often gives the human body a sense of discomfort. On the other hand, if we set the outlet temperature to the target value from the beginning in order to prevent such sudden temperature changes, it would take a long time for the indoor temperature to reach the rounded target value, which is slow to change. , the effect of precooling and preheating cannot be obtained.

The present invention is intended to solve the problems of the prior art, and its purpose is to gradually reduce the temperature from the minimum or expanded maximum temperature during precooling and preheating at the blowout temperature when performing precooling and preheating with an air conditioner. To provide a system that prevents sudden temperature changes by changing the temperature so as to approach a target value, thereby not giving discomfort to an eight unit, and also not losing the effect of precooling and preheating. There is K.

Hereinafter, the present invention will be described in detail with reference to Examples.

Figure 2 explains the control of precooling and preheating by the blowout temperature optimum control method of the present invention.

In the figure, (a) shows the case of pre-cooling control, and (b) shows the case of pre-heating control. As in the case of Fig. 1, the horizontal axis shows time (1), and the vertical axis shows time (1). The figure shows the relationship between the blowout temperature (actual l!l) and the indoor temperature (1 point is*>), taking temperature (1).In the case of the method of the present invention, the indoor temperature reaches the target value. Before setting an appropriate value (control value),
After the indoor temperature reaches the control value, the blowing temperature is gradually brought closer to the target value and blowing is performed for a certain period of time, so that the difference between the blowing temperature and the indoor temperature will be small at the end of precooling and preheating. This prevents the human body from feeling uncomfortable as described above, and also prevents the precooling and preheating effects from being lost. In FIG. 2, the 8-dot chain line indicates the control value, and when the indoor temperature exceeds this value, it is shown that a stepwise change occurs in the blowout temperature.

At this time, the new blowout temperature is determined by giving appropriate weight to the difference between the room temperature and the control value, so that precooling and preheating can be performed effectively.

FIG. 3 shows a 70-chart of control in the Suita temperature optimum control method of the present invention.

The procedure for controlling the blowout temperature according to the method of the present invention will be explained below with reference to the same figure. First, the indoor temperature O is measured. Next, in the case of precooling, subtract the control value from the room temperature and calculate the difference temperature T.
RC is determined and compared with the difference temperature TRCt O. If it is 0 or more, the 11th blowout is continued without changing the blowout temperature. When the temperature difference Ta1c becomes smaller than O, the temperature difference TicK multiplied by a predetermined weight is added to the previous blowout temperature to determine a new blowout temperature. Next, the obtained new blowout temperature is compared with the target value, and if the new blowout temperature is less than or equal to the target value, the precooling is terminated. If the calculated new blowout temperature does not reach the target value, after operating at that temperature for a certain period of time, the indoor temperature is measured again and the next cycle is performed. By repeating such a cycle at regular intervals, the blowing temperature is not changed stepwise, but is controlled until the blowing temperature reaches the target value, and after the blowing temperature has exceeded the target value, blowing continues at the target value.

In the case of preheating, the indoor temperature is measured, the indoor temperature is subtracted from the control value to obtain a differential temperature Tea, and this is compared with O to determine a new blowout temperature. In this case, the difference temperature TcnK multiplied by a predetermined weight is subtracted from the previous blowout temperature to obtain a new blowout temperature.

If the new blowout temperature found is equal to or higher than the target value, precooling is terminated, and if it has not reached the target value, the next cycle is started after operating at that temperature for a certain period of time, which is the same as in the case of precooling. .

FIG. 4 shows the configuration of an embodiment of the optimum control system for the blowout temperature of the present invention. In the figure, a one-wire air conditioner is shown, the outlet temperature of which is set at the outlet temperature set point. 3 indicates a space to be air-conditioned, and its temperature is measured by an expanded indoor temperature sensor 4. The room temperature data measured by the temperature sensor 4 is sent to the central processing unit (CPU)
is loaded into.

It is a 6-wire disk memory, and stores data on control values, target values, and previous blowout temperature.

The CPU S uses the room temperature data and the data read out from the disk memory 6 to run as shown in FIG. 3, 7a.
- Determine the outlet temperature according to the chart.

Reference numeral 7 denotes a setting control device, which controls the air conditioner 1 according to the air outlet temperature information from the CPU 5 to set the air outlet temperature setting point! Ensure that the specified blowout temperature is reached. As a result, desired blowout temperature control is performed, and when the blowout temperature reaches the target value, the precooling and preheating is completed.

As explained above, according to the optimal control method for outlet temperature of the present invention, when performing precooling and preheating using an air conditioner, the outlet temperature can be controlled so as to gradually approach the target value from the lowest or highest temperature during precooling and preheating. This is extremely effective because it prevents sudden temperature changes from occurring, thereby not causing discomfort to the human body, and preventing the precooling and preheating effects from being lost.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the control of precooling and preheating by the conventional method;
Fig. 2 is an explanatory diagram showing control of precooling and preheating according to the method of the present invention, Fig. 3 is a flowchart of control according to the method of the present invention, and Fig. 4 is an example of the single-blowout optimal Puntrol method of the present invention. FIG. 2 is a block diagram showing the configuration of FIG. l...Air conditioner, 2...Blowout temperature setting point, 3.
... Air conditioned space, 4... Indoor temperature sensor, G... Central processing unit (CPU), 11... Disk memory, 7...
・Setting control device. Patent applicant Fujitsu Limited

Claims (1)

[Claims] In an air conditioning system that blows out air that has been cooled or heated by an air conditioner to precool or preheat the air conditioned space to a target value by the time the air conditioned space begins to be used, cooling is performed using the air conditioner's outlet temperature as the minimum or maximum when precooling or preheating begins. Alternatively, heating is performed, and the indoor temperature is measured at regular intervals, and if the carcass temperature does not reach a preset control value above or below the target value, the air blowing continues at the minimum or maximum blowing temperature, and the indoor temperature is When the temperature reaches the control value, a temperature equal to the difference between the indoor temperature and the control value multiplied by a certain weight is added or subtracted from the previous outlet temperature to determine a new outlet temperature, and the new outlet temperature is set as the target. The optimal control method for the outlet temperature is characterized in that when the new outlet temperature reaches the target value, precooling or preheating is terminated, and if the new outlet temperature does not reach the target value, the outlet temperature is continued at that outlet temperature.