JPS6078240A - Air conditioning by controlling carrying system - Google Patents

Abstract

PURPOSE:To establish a great amount of energy saving by a method wherein the carrying system of water serving as heat source and the carrying system of air are properly controlled in an air conditioning system employing water as heat source. CONSTITUTION:A temperature detector 9 to detect the temperature of the water serving as heat source passing through the coil 3 of each system is mounted on the branch pipe 10 of a return pipe of the water serving as heat source. When cold water operation or hot water operation is intended, the coil, from which the water serving as heat source with the highest temperature or lowest temperature leaves, is detected out of the coils 3 of the respective air conditioners. If the temperature of the detected coil 3 exceeds the set value or is below the set value, the water feeding capacity of a pump 6 is increased so as to bring said temperature to the set value. In addition, an air passage 16, through which air is sucked in a fan 4 by by-passing the coil 3, is provided parallel to the coil 3 and a damper 17 is interposed in the passage 16. The damper 17 is open and closed so as to control the air temperature on the discharge side of the fan 4 to be brought to the set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning method that achieves great energy savings by appropriately controlling the heat source water conveyance system and the air conveyance system in a water heat source air conditioning system.

BACKGROUND ART Conventionally, there is a so-called "VAV system" as an air conditioning system that aims to save energy. The capacity control of the blower in this VAV method is to control the pressure at "a certain point" on the outlet side of the blower to be constant.

On the other hand, even in air conditioning systems that use heat source water as a heat source, methods have been proposed to similarly save energy in the heat source water circulation system. In other words, this is a technique that attempts to control the pressure at a "certain point" on the pump discharge side to be constant.

However, in any case, since the pressure of the fluid on the machine outlet side is to be kept constant, it is inevitable that the excess pressure will be consumed by the control valve, etc. on the load side. Therefore, there is naturally a limit to its energy saving effect.

The present invention aims to provide a method for realizing indoor temperature and humidity control by appropriately controlling the capacity of the heat source water circulation pump and also the capacity of the air conditioner blower, as an energy-saving system that replaces such conventional methods. It is something to do. That is, the present invention measures the temperature of the heat source water immediately after passing through each air conditioner coil in an air conditioning system in which heat source water is circulated from a heat source device to a plurality of air conditioner coils by a pump, and in the case of cooling operation, the temperature of the heat source water is measured. The capacity of the heat source water circulation pump is controlled so that the temperature at the highest point among the measured values approaches the set water temperature, and in the case of heating operation, the temperature at the lowest point among the measured values approaches the set water temperature. In addition, the general air system control (air) controls the amount of air supplied by bypassing each air conditioner coil so that the temperature of the supply air from each air conditioner approaches the set value.

In addition, the present invention provides an energy-saving air conditioning method that includes the following: measuring the indoor temperature and controlling the blowing function of the air conditioner so that the indoor temperature approaches a set value based on the measured value. .

The details of the present invention will be specifically explained below with reference to the drawings.

FIG. 1 shows equipment to which the method of the present invention is applied, taking as an example a case where one water circulation system has three systems of air conditioners. Each air conditioner 1 supplies air at the required temperature and humidity to the air conditioning zone 2 that it is responsible for, according to a conventional method, and on the other hand,
The air conditioner 1 takes in air from an air conditioning zone 2 and also takes in outside air. In this example, the air conditioner 1 is an air handling unit having a coil 3 through which heat source water flows and a blower 4. Cold or hot water produced by a heat source device 5 is supplied to each coil 3 by a circulation pump 6. The outgoing pipe 7
The heat source water that has passed through each coil 3 is returned to the return pipe 8.
The process then returns to the heat source device 5.

The present invention controls the operation of the circulation pump 6 in the most energy-saving manner in such a water heat source air conditioning system, and for this purpose, the temperature of each heat source water that has passed through each coil 3 is first detected. A temperature detector 9 is attached to the branch pipe 10 where the heat source water returns from each coil 3 to the return pipe 9. Then, the signals from each temperature detector 9 are sent to the control measured value selection board 11, where the lowest temperature signal or the highest temperature signal is selected. More specifically, when the heat source water is cold water (that is, during cooling operation), the highest temperature signal is selected, and when the heat source water is hot water (that is, during heating operation), the lowest temperature signal is selected. select. The maximum measured temperature or the minimum measured temperature selected here is compared with the set water temperature in the water temperature controller 12, and if there is a difference, the rotation speed control panel 13 of the pump 6 is set so that the difference is reduced. Outputs a control signal. That is, the rotation speed of the motor 14 of the pump 6 is controlled.

For example, in the case of chilled water operation (cooling operation), it is detected that among the heat source water temperatures emitted from each air conditioner coil 3, the water emitted from a certain coil has the highest temperature, and this temperature exceeds the set value. Sometimes, the water supply capacity of the pump 6 is increased so that this maximum temperature drops to the set temperature (
(increasing the rotational speed of the motor 14). In addition, if even the highest temperature of the heat source water coming out of each coil 3 is lower than the set temperature, the water supply capacity of the pump 6 is reduced so that the maximum temperature rises to the set temperature (the rotation of the motor 14 lower the number). In other words, when supplying cold water to multiple air conditioners 1 from one heat source water circulation path, the capacity of the pump 6 is controlled so that the highest water temperature out of each coil 3 approaches the set water temperature. It is.

Similarly, in hot water operation (heating operation), if the lowest temperature of the hot water discharged from each coil 3 is lower than the set temperature, the water supply capacity of the pump 6 is adjusted so that this lowest temperature rises to the set temperature. (increase the rotation speed of the pump motor), and if this minimum temperature exceeds the set temperature, lower the water supply capacity of the pump 6 (lower the rotation speed of the pump motor) so that this minimum temperature approaches the set temperature. In other words, when hot water is supplied to a plurality of air conditioners 1 from one heat source water circulation path, the lowest water temperature among the water output from each coil 3 approaches the set water temperature.

The capacity of the pump 6 is controlled. An example of this control flow is shown in FIG.

As a result, the heat source water necessary to cover the required load can be supplied to the air conditioner with the minimum required pump power, and while sufficient air conditioning can be achieved, if the required load decreases, the pump power will also increase accordingly. True power savings are achieved since the machine operates with less power.

In addition, even in the air system, further energy savings can be achieved by implementing the following controls.

The second one is control of the amount of air passing through the coil 3, and the second one is the ability control of the air blower ta4.

In the present invention, the former control of the amount of air passing through the coil 3 is performed as follows. An air passage 16 that bypasses the coil 3 and is drawn into the blower 4.

It is provided in parallel to the coil 3, and a damper 17 is interposed therebetween. The opening and closing of this damper 17 is controlled so that the air temperature on the discharge side of the blower 4 reaches the set temperature. More specifically, a temperature detector 19 is attached to the discharge side air supply path 18 of each blower 4, and a signal from this temperature detector 19 is sent to the supply air temperature controller 20.

Here, the temperature is compared with the set temperature, and an opening/closing control signal for the damper 17 is outputted so as to reduce this difference. For example, in the case of cooling operation, when the supply air temperature is lower than the set temperature, the damper 17 is opened so that the supply air temperature approaches the set temperature. In heating operation, on the other hand, when the supply air temperature is higher than the set temperature, the damper 17 is opened. An example of this control flow is shown in FIG.

This damper control avoids wasteful consumption of cold or hot heat in the coil 3, which not only saves the heat source, but also further increases pump power when combined with the pump capacity control described above. A reduction will be achieved.

Next, we will explain the latter capacity control of the blower 4.
In the method of the present invention, the room temperature (not the supply air temperature) is detected and air is blown tJI! so that the room temperature reaches the set temperature. Control the amount of air blown in step 4. More specifically, the detection signal of the temperature detector 22 that detects each indoor temperature is sent to the room temperature controller 2.
3, and if there is a difference from the set temperature, a control signal is output to the blower function control panel 24. Control panel 24
controls the rotation speed of the blower motor 25. This motor 2
In place of the rotational speed control in step 5, the amount of air blown may be made variable by controlling the pitch angle of the blower blades. In this way, 9 For example, in cooling operation, if the room temperature is higher than the set temperature, the air blowing capacity is increased, and if the room temperature is lower, the air blowing capacity is lowered.In heating operation, if the room temperature is lower than the set temperature, the air blowing capacity is increased. Conversely, if the air pressure is high, control is implemented to lower the air blowing capacity. An example of this control flow is shown in FIG.

This air blower function power control controls the indoor temperature for each air conditioning zone and satisfies the required load with the least amount of blower power, eliminating wasted power consumption. When combined with the control of the heat source water conveyance system, the energy-saving effect increases synergistically, making it possible to achieve energy-saving air conditioning that exceeds the limits achieved by conventional pressure control methods for the fluid on the discharge side of blowers and pumps. Become.

[Brief explanation of the drawing]

Figure 1 is an equipment layout system diagram showing an example of equipment for carrying out the method of the present invention, Figure 2 is a flow diagram of heat source water circulation system control, Figure 3 is a flow diagram of coil passing air volume control, and Figure 4 is It is a flowchart of capacity control of an air conditioner blower. 1. Air conditioner, 2. Air conditioning zone, 3. Coil, 4.
・Air conditioner blower, 5. Heat source equipment. 6... Circulation pump, 9.19 and 22... Temperature detector, 11... Control measurement value selection panel, 12... Water temperature adjustment needle, 13... Rotation speed control panel, 14... Pump motor, 16
...Bypass passage. 17... Bypass damper, 20... Supply air temperature controller,
23...Room temperature controller, 24...Blower function power control panel, 25...Blower motor.

Claims (3)

[Claims] (1) In an air conditioning system that circulates heat source water from a heat source device to multiple air conditioner coils using a pump. The temperature of the heat source water immediately after passing through each air conditioner coil is measured, and in the case of cooling operation, the temperature at the highest measurement point among the measured values approaches the set water temperature. Further, in the case of heating operation, the air conditioning method is characterized in that the capacity of the heat source water circulation pump is controlled so that the temperature at the lowest measurement point among the measured values approaches the set water temperature. (2) In an air conditioning system that circulates heat source water from a heat source device to a plurality of air tits coils using a pump. The temperature of the heat source water immediately after passing through each air conditioner coil is measured, and in the case of cooling operation, the temperature at the highest measurement point among the measured values approaches the set water temperature. In addition, in the case of heating operation, the capacity of the heat source water circulation pump is controlled so that the temperature at the lowest point among the measured values approaches the set water temperature, and the temperature of the supply air from each air conditioner approaches the set value. An air conditioning method characterized by controlling the amount of air supplied by bypassing each air conditioner coil. (3) In an air conditioning system that circulates heat source water from a heat source device to multiple air conditioner coils using a pump. The temperature of the heat source water immediately after passing through each air conditioner coil is measured, and in the case of cooling operation, the temperature at the highest measurement point among the measured values approaches the set water temperature. In addition, in the case of heating operation, the capacity of the heat source water circulation pump is controlled so that the temperature at the lowest point among the measured values approaches the set water temperature, and the temperature of the supply air from each air conditioner approaches the set value ( It bypasses each air conditioner coil to control the amount of air supplied, measures the indoor temperature, and based on this measurement controls the air conditioner's blowing function so that the indoor temperature approaches the set value. An air conditioning method characterized by: