JPS6237632A - Air-conditioning machine - Google Patents

Abstract

PURPOSE:To control a room temperature correctly at a set value and improve the temperature distribution in up-and-down direction of a room by a method wherein the thermal loads of respective rooms are measured from differences between the set room temperatures of room thermostats and detected room temperatures to change the opening degrees of dampers in accordance with the temperature differences at every controls based on the result of measurements. CONSTITUTION:The air-conditioning machine is provided with a heat source machine 17, connected to the heat exchanger 4 of an air handling unit 2, a fan 5, carrying cold or warm air generated by the heat source machine 17 and the exchanger 4, a main duct 6 connected to the fan 5, air volume regulating dampers 9, arranged in the branch ducts 7 of the main duct 6, and the room thermostats 14, equipped in respective rooms 1. The thermal loads of respective rooms 1 are measured by a thermal load measuring means 18, inputting the signals of set room temperatures, set in the room thermostats 14 and detected room temperatures, and the opening degrees of the dampers 9 are changed from the previously set positions thereof at every controls by the damper control means 19 based on the output of the means 18 in accordance with the temperature differences.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a variable IT system that can independently adjust the room temperature of each room.
This relates to a duct type air conditioner that uses a control system.

[Conventional technology]

Central air conditioning systems use air ducts to distribute temperature-controlled air to each room for air conditioning, and can easily incorporate humidifiers and high-performance filters, as well as external air processing and total heat exchangers. Heat pump chillers and fan coils allow for high-quality air conditioning, and since the room being air-conditioned only has an air outlet and an inlet, indoor space can be used effectively, and there are fewer problems with the heat transfer system. The variable air volume control method (hereinafter referred to as the VAV method), which allows for energy-saving movements, has many advantages compared to other systems such as the ``Packet'' shared air conditioner distributed arrangement method, and is therefore widely used in building air conditioning. It is possible to independently control the temperature of each room with a different heat load, it is also possible to stop air conditioning in rooms that are not in use, and it is possible to reduce operating costs by varying the power of the blower depending on the amount of air required. Also, by considering the simultaneous usage rate, the capacity of the heat source equipment can be designed to be smaller.

For the above VAV system, there are 2
There are two methods. One is a method using a bypass type VAV unit, which adjusts the ratio of the amount of air blown into the room and the amount of air directly returned to the heat source equipment (bypassed) depending on the indoor load. This method is often used in systems using packaged air conditioners, where it is difficult to control the capacity of the heat source equipment because the amount of air blown is constant, but there is no energy saving effect by controlling the blower.

Another method is to use an aperture-type VAV type unit. This method detects the pressure inside the duct, which changes according to the opening degree of the damper, and controls the capacity of the blower so that this value becomes the set value. (The air temperature in the duct must be controlled to be constant), the required capacity of the heat source equipment is reduced, and at the same time the power of the blower is reduced.

Conventional technology using the type VAV Yu; a)
It has been known. FIG. 4 is a system configuration diagram of these conventional air conditioners. In the ff'f1 diagram, 1 indicates an air-conditioned room, and here 17 shows the case of 1 to 3 rooms. 2. An air handling unit placed in the ceiling of room 1, with an air filter 3. Heat exchanger4. It is composed of a blower 5. 6 is a main duct connected to the air outlet of this air handling unit 2, 7 is three branch ducts branched from this main duct 6 according to the number of rooms, and 8 is a throttle inserted in the middle of this branch duct. VAV unit 11, 9 is a damper rotatably installed in the VAV unit 8 of Otsu, and 10 is the above-mentioned duct 7.
11 is a suction port installed at the bottom of the door of the room 1, 12 is a ceiling suction port installed on the ceiling of the hallway, and 13 is a connection between this ceiling suction port 12 and the air handling unit 2. 14 is a room thermostat installed in each room 1, 15 is a temperature detector installed in the main duct 6, and 16 is a pressure detector installed in the main duct 6. , 171: is a heat source device such as a heat pump connected to the heat exchanger 4.

In the conventional air conditioner configured as described above, the opening degree of the damper 9 is adjusted to an arbitrary position according to the temperature difference between the set temperature set by the user on each room thermostat 14 and the detected current air temperature. Adjust. Then, the pressure inside the main dug 1-6 changes according to the opening degree of the damper 9, which is detected by the pressure detection M16, and the capacity of the air blower [5 is changed to prevent excessive pressure. In addition, since the outlet air temperature of the heat exchanger 4 changes as the air flow rate changes, this temperature is detected by the temperature detector 15 and the capacity of the heat source device 17 is controlled so that the air temperature reaches a preset value. do.

The air, which has been adjusted to a substantially constant temperature in this manner, is blown out into the room 1 from the air outlet 10 at an air volume that corresponds to the magnitude of the indoor heat load. The air that has been conditioned in the room 1 flows from a suction port 11 through a space such as a hallway to a ceiling suction port 12, and returns to the air handling unit 2 via a suction duct 13.

FIG. 5 is a diagram showing how the air passing through the VAV unit is controlled with respect to the cooling load shown in FIGS. 2 and 14 of the Refrigeration and Air Conditioning Handbook. Here, the cooling load can be replaced with the difference between the current room temperature and the set room temperature, and the air volume can be replaced with the opening degree of the damper 9. As the room temperature decreases due to the cooling operation and the difference from the set room temperature becomes smaller, the damper 9 gradually closes and blows an air volume balanced with the heat load into the room 1 from the air outlet 10. Note that the relationship between heating load and air volume is the same during heating.
The above is a VAV method that uses a throttle type VAV unit to balance the heat load and blow out a stable air volume.
There is a method that periodically switches to the bypass) side and intermittently controls the blowout air volume. In addition, although it is not a vAV method, there is a method in which the opening degree of a damper provided in the duct is periodically varied to pulsate the amount of air blown out.
No. 7 and Japanese Unexamined Patent Publication No. 59-49443. According to this method, when cooling by changing the wind speed,
This has the effect of lowering the perceived temperature of the air-conditioned person directly below the air outlet with less energy.

[Problem that the invention seeks to solve]

Conventional air conditioners such as those mentioned above (aperture type VA
In an air conditioner using a V unit, the capacity of the blower 5 is controlled as the heat load decreases, so it is effective to reduce the blowing power at low loads, but as the room temperature approaches the set value, the damper 9 is constricted and the air volume is reduced, the speed of the air blowing out from the air outlet 10 provided on the ceiling surface is reduced, and the hot air does not reach the floor during heating (as a result, the temperature difference between the top and bottom inside the room 1 becomes large). There was a problem with this, which created an uncomfortable environment.

Further, in an air conditioner using a bypass type VAV unit, the capacity of the blower is not controlled, so a large blowing power is not required even when the load is low.

Furthermore, with air conditioners that simply vary the damper periodically, it is not possible to automatically set the optimal air volume according to the heat load.
Accurately adjust the room temperature to the set value f111! ! There was a problem that it was not possible to perform rI.

This invention solves the above-mentioned problems. By changing the opening degree of the damper for each smoke control according to the difference between the room temperature and the set room temperature, it is possible to accurately control the room temperature around the set value. The purpose of the present invention is to obtain an air conditioner with good vertical temperature distribution indoors.

[Means for solving problems]

The air conditioner according to the present invention inputs signals of the set room temperature and detected room temperature of the room thermostat of each room where cold and hot air from the heat source device is distributed through the duct, and calculates the heat load of each room based on the difference between the signals. and a damper control means that changes the opening degree of the damper in accordance with the temperature difference from the previous position for each smoke control based on the measurement results.

[For production]

In this invention, the heat load measuring means measures the heat load of the room based on the difference between the room temperature set by the room thermostat and the detected current room temperature, and the damper control means measures the heat load of the room based on the output of the heat load measuring means. For each smoke control, the opening degree of the damper is changed from the previous position by an amount corresponding to the temperature difference, thereby accurately controlling the room temperature to the set value and improving the vertical temperature distribution in the room.

〔Example〕

FIG. 1 is an overall principle block diagram showing an embodiment of an air conditioner according to the present invention. As is clear from FIG. 1, a heat source device 17 connected to the heat exchanger 4 of the air handling unit 2, a blower 5 that conveys cold and hot air generated by the heat source device 17 and the heat exchanger 4, and a blower 5 that conveys cold and hot air generated by the heat source device 17 and the heat exchanger 4, A main duct 6 connected to the main duct 5, a damper 9 for adjusting air volume arranged in a branch duct 7 of the main duct 6, and a room thermostat 14 installed in each room 1. Heat load measuring means 18 which receives the room temperature set in step 14 and the detected room temperature signal as input.
The heat load in each room 1 is measured from the above-mentioned temperature difference, and based on the output, the damper control means 19 is configured to change the opening degree of the damper 9 for each smoke control according to the temperature difference from the previous position. .

Next, while referring to the flowchart shown in FIG. 2 to explain the operation of the above embodiment, fJ! Let me explain about the time.

Note that although it is desirable to realize these controls using a microcomputer, that circuit has been omitted. Further, the detailed control of the heat source device 17 and the blower 5 is omitted because it is not significantly related to the present invention.

7. When the air conditioner starts heating operation, the control program shown in FIG. (not shown). Next, in step 21, the value of the amount of change in the opening degree of the damper 9 is obtained by multiplying (To-T) by the constant A, and is added to the value of the current opening degree (V). That is, if the room temperature is lower than the set value, the damper 9 changes in the opening direction, and if it is higher, the damper 9 changes in the closing direction. The amount of change at this time increases as the difference between the set value and the electric current increases.

In steps 22 to 25, when the damper 9 is controlled to be fully open or more, the value is set to fully open (100%), and when it is controlled to be fully closed or more, the value is set to fully closed (O, DEG C.). Step 26
Then, the control amount of the damper 9 is outputted from the control device, and its opening degree is changed by a stepping motor or the like. The above control is repeated at regular time intervals to maintain the room temperature at the set value. Since the opening degree of the damper 9 is changed for each control, depending on the value of the control constant A, the phenomenon of the damper 9 being too open or too tight occurs at irregular intervals, and the room temperature It moves up and down around the set value.

FIGS. 3a and 3b show experimental results of clubs in which changes in the opening degree of the damper 9 and changes in room temperature when controlled in this manner are shown for each of three rooms, with time plotted on the horizontal axis.

At operation star 1, the room temperature is significantly lower than the set value, so the dampers in each room 1 remain open for a while, and after the room temperature reaches the set value, proportional control close to OFF/OFF operation is performed. The room temperature is well controlled around the set value. The air volume from the Suita mouth 10 changes greatly depending on the opening degree of the duct 9, and this directly leads to a change in the blowout wind speed. When the m speed is large, the arrival distance of the hot air increases and it reaches close to the floor, causing indoor The temperature difference between the top and bottom is reduced, creating a comfortable heating environment. Furthermore, since there is no need to heat the vicinity of the ceiling unnecessarily, the energy consumed by the heat source device 17 is also saved.

Although the above explanation is for heating, this control method is also effective for cooling. During cooling, even if the velocity of the cold air blown from near the ceiling is low, the vertical temperature distribution in the room is relatively good, but, as in the conventional example, a feeling of cool breeze is obtained due to random changes in the wind velocity.

〔Effect of the invention〕

As described above, according to the present invention, since the opening degree of the damper is changed for each control according to the difference between the set value and the detected value of the room temperature, the room temperature can be accurately controlled to the set value, and
It is possible to maintain a good vertical temperature distribution in the room.

[Brief explanation of the drawing]

Fig. 1 is an overall principle configuration diagram showing an embodiment of the air conditioner of the present invention, Fig. 2 is a flowchart for explaining the operation of Fig. 1, and Fig. 3 shows an example of the control results in the present invention. 4 is a system configuration diagram of a conventional air conditioner, and FIG. 5 is a diagram showing the state of control of the amount of passing air in the conventional example. 1・゛Room, 2°・°Air handling unit, 5
...Blower, 6...Duct, 9...Damper, 14.
- Room thermostat, 17. Heat source device, 18.. Heat load measuring means, 19.. Damper control means. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) 7th! ! 1 1 l: Maximum limit Figure 2, 311I C no binding cb) - Mr. Mon Showa 1999, 2017
[Aim 1, Display of the incident Patent application 1986-176466
No. 2, Title of the invention Air conditioner 3, Relationship with the case of the person making the amendment Patent applicant representative Moriya Shiki 4, agent 5, subject of amendment (1) Claims column of the specification (2) ) Column 6 of Detailed Description of the Invention in the Specification, Contents of Amendment (1) The scope of claims in the specification is amended as shown in the attached sheet. (2) "(0°C)" on page 10, line 17 of the specification is corrected to "(0%)". (3) On page 11, line 9, the word "club" is corrected to "graph". (4) On page 11, line 14 of the same page, replace ``9 ducts'' with ``
Damper 9” is corrected. 7. Attached documents (1) Document containing the entire text of the amended claims 1 copy of the amended claims 2. Claims! A heat source device that generates wind or cold/hot air, a blower and duct that distributes the cold/hot air from this heat source device to each room, a damper to adjust the air volume placed at the back of this duct, and a room thermostat installed in each room. In the air conditioner equipped with a heat load measuring means, the heat load of each room is measured from the difference between the room temperature set by the room thermostat and the detected quick signal, and the output of this heat load measuring means. An air conditioner characterized by comprising damper control means that changes the opening degree of the damper in accordance with the temperature difference from the previous position in each control based on the above.

Claims (1)

[Claims] A heat source device that generates cold air or hot and cold air, a blower and duct that distributes the cold and hot air from this heat source device to each room, a damper that adjusts the air volume placed on the branch of this duct, and a room thermostat installed in each room. In the air conditioner equipped with the above-mentioned air conditioner, a heat load measuring means measures the heat load of each room based on the difference between the signals of the room temperature set by the room thermostat and the detected room temperature as input, and based on the output of this heat load measuring means. An air conditioner characterized by comprising a damper control means that changes the opening degree of the damper in accordance with the temperature difference from the previous position for each control.