JPS6217550A - Control device for cascade - Google Patents

Abstract

PURPOSE:To reduce the uncomfortable feeling of inhabitants in the objective space of air conditioning, which is caused due to sunshine, with a simple constitution by a method wherein the set value of room temperature in feedback loop series is added or subtracted in accordance with the output signal of a comparator. CONSTITUTION:When the output voltage signal (a) of a light volume detecting unit 101 is smaller than the output voltage signal (b) of a light volume setting unit 1, the output signal (c) of a comparator 2 becomes H while the same signal becomes L in a reverse case. When the output signal (c) is H, the output voltage signal of a room temperature setting unit 102 is added with a given voltage width by an adding and subtracting device 3 in synchronizing with the generating pulse of output signal (e) of an astable multivibrator 4. When the output signal (c) is L, the same value is subtracted in the same manner. As a result, the room temperature control unit 103 controls a cold and hot water value 104 by the added or subtracted set voltage signal (d). According to this method, the set value in the room temperature control series is changed in every predetermined time based on the output signal of a light volume control series to control the amount of heat supplied excessively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cascade control device for controlling the heating and cooling capacity of an air handling unit often used for air conditioning in buildings.

Prior Art A conventional cascade control device has a configuration as shown in FIG. That is, the respective outputs of the indoor temperature detection section 105 and the indoor temperature setting section 10b are inputted, and a signal corresponding to the deviation is sent from the indoor temperature control section 107 to the cold/hot water valve 108.

Problems to be Solved by the Invention This conventional configuration does not take into account the effect of solar radiation on the target process, especially on the outer periphery, on people in the room. The sensible temperature will be higher than normal. Therefore, with the conventional system, it was not possible to control the temperature according to the 1 degrees Celsius sensation felt by the people in the room.The present invention solves these problems and uses a simple configuration to control the temperature in the target air-conditioned space due to solar radiation. The purpose is to reduce the discomfort experienced by people.

Means for Solving the Problem In order to solve this problem, the cascade control device of the present invention includes a comparator that compares the output from the scene detection section with a reference value, and a value that is the reference value of the comparator. The device includes a light amount setting section for setting, and an adder/subtracter for adding or subtracting a set value of the indoor temperature feedback loop system in response to the output signal of the comparator.

Function: With this configuration, the indoor temperature setting value is automatically added or subtracted at regular intervals according to the output value from the light amount detection section, and the control amount of the cold/hot water valve is changed, thereby reducing the presence of heat caused by the radiant heat of sunlight. This can eliminate the discomfort of the occupants.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In FIG. 1, the light quantity detection section is connected, and the output terminal of the comparator 2 is connected to the addition/subtraction switching terminal of the adder/subtractor 3. The indoor temperature setting section 102 is connected to the input terminal of the adder/subtractor 3, and the astable multivibrator 4 is connected to the enable terminal of the adder/subtractor 3. The output terminal of the adder/subtractor 3 is connected to the input terminal of the indoor temperature control section 103. Then, the cold/hot water valve 104 is controlled based on the signal from the indoor temperature control section 103.

The operation of this embodiment will be explained below with reference to FIG.

In FIG. 2, when the output voltage signal a of the light amount detection section 101 is smaller than the output voltage signal of the light amount setting section 1, the output signal C of the comparator 2 becomes H, and in the opposite case, it becomes L. When the output signal C is H, the adder/subtractor 3 synchronizes with the generated pulse of the output signal e of the astable multivibrator 4,
The output voltage signal is added to the output voltage signal of the degree setting section 102 in a constant voltage width. When the output signal C is L, subtraction is performed in the same manner. As a result, the indoor temperature control unit 103 controls the cold/hot water valve 104 based on the added or subtracted set voltage signal d.

Effects of the Invention As is clear from the above embodiments, according to the present invention, based on the output signal of the light amount control system, the set value of the indoor temperature control system is automatically changed at regular intervals to supply extra light. By controlling the amount of heat, it is possible to eliminate the discomfort of occupants due to solar radiation and to obtain an energy saving effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a cascade control device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram of the main parts thereof, and FIG. 3 is a block diagram of a conventional cascade control device. 1...Light amount setting section, 2...Comparator, 3
. . . Adder/subtractor, 101 . . . Light amount detection unit.

Claims (1)

[Claims] a light amount detection section that detects the amount of light; a comparator that compares the output from the light amount detection section with a reference value; a light amount setting section that sets the reference value of the comparator; and an output signal of the comparator. A cascade control device comprising an adder/subtractor that adds or subtracts a set value of an indoor temperature feedback loop system in accordance with the above.