JPS6044745A - Air conditioning device - Google Patents

Abstract

PURPOSE:To improve the controllability of indoor temperature by a method wherein the desired value of the difference between the supply air temperature and the return air temperature is determined in accordance with the deviation between the set temperature and the return air temperature and then the opening and closing of a heating-cooling rate regulating valve is controlled so as to bring said difference near to the desired value. CONSTITUTION:The indoor air sucked from a sitting room 9 through a suction passage 10 is cooled or heated by a cooling-heating unit 11 and then supplied by means of a supply fan 12 to the sitting room through a discharge passage 13 in a form of cold air or hot air. The measured values of a return air temperature sensor 15 arranged in the suction passage 10 and of a supply air temperature sensor 16 arranged in the discharge passage 13 is inputted to a control section 14 in order to determine the amount of heat to supply to the cooling-heating unit 11 in accordance with the deviation between the set temperature value and the return air temperature and to close and open a cooling-heating rate regulating valve 17 so as to bring the difference between the supply air temperature and the return air temperature near to the desired value of said difference, which is determined by said amount of heat to be supplied to the cooling-heating unit 11. Thus, the amount of heat to be supplied is kept unchanged, even when the temperature and flow rate of heat transfer medium supplying to the cooling- heating unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner for living spaces such as factories and buildings.

Conventional configuration and its problems The configuration of the conventional example will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram of a conventional air conditioning system. Indoor air is sucked from a living room 1 through a suction path 2, cooled or heated by a cold/hot water coil 3, and then passed through a discharge path 6 by a blower fan 4. , cold air or warm air is suddenly supplied to the living room 1. The cooling or heating amount of the air conditioner is adjusted by the control unit 6 in proportion to the deviation between the return air temperature detector 7 installed in the suction path 2 and the temperature setting value of the control unit 6. This is achieved by adjusting the opening degree of the heating adjustment valve 8. As shown in FIG. 2, the relationship between the return air temperature value detected by the return air temperature detector 7 and the valve opening degree of the cooling/heating adjustment valve 8 is such that the temperature set value 'r3 and the return air temperature value match. In this case, the valve opening is determined to be 60%, and the deviation between the temperature set value and the return air temperature value corresponds proportionally to the valve opening within a pre-fixed proportional band. . Therefore, the actual amount of heat supplied by the cold/hot water coil 3 is a function of the cold/hot water flow rate and the cold/hot water temperature. Then, once the valve opening degree is determined,
It is assumed that the flow rate of cold and hot water is uniquely determined, and that the temperature of the cold and hot water does not change, point 02.

However, in real-life air conditioning equipment, the equipment costs are high, so strict control of cold and hot water is not performed, and the flow rate characteristics often fluctuate over time, and the temperature of the cold and hot water also often fluctuates. These disturbance elements directly become factors for fluctuations in the room temperature, and together with the fluctuations in the indoor load, they cause deterioration in the controllability of the indoor temperature.

SUMMARY OF THE INVENTION The present invention aims to improve the controllability of indoor temperature by eliminating the drawbacks of the conventional example and controlling fluctuations in the amount of heat supplied.

Configuration of the Invention The air conditioner of the present invention includes a blower fan, a cooling/heating device,
It consists of a cooling/heating valve, a supply air temperature detector, a return air temperature detector, and a control section. A target value for the difference between is determined, and the opening and closing of the heating and cooling amount adjustment valve is controlled so as to approach this target value.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 3, 4, and 5.

FIG. 3 is a diagram of an air conditioning system according to an embodiment of the present invention,
Indoor air sucked from the living room 9 through the suction path 10 is cooled or heated by the cooling/heating device 11, and cold or warm air is supplied to the living room through the discharge path 13 by the blower fan 12. The measurement values of the return air temperature detector 15 installed in the suction passage 10 and the supply air temperature detector 16 installed in the discharge passage 13r are input to the control unit 14, and from the control unit 14, A valve opening signal is output to a heating/cooling amount adjustment valve 17 that controls heating or cooling of the device 11.The temperature setting value is preset in the control unit 14.18 is the air conditioner main body; Here, the amount of heat to be supplied to the cooling/heating device 11 is determined according to a predetermined corresponding value shown in FIG. 4 according to the deviation between the return air temperature value and the temperature setting value.

Here, the amount of heat actually supplied is expressed by the following formula.

Q = r-G(θ.-θi) ・・・・・・・・・
...(1) - And, Q is the supplied heat fi (kmA), r is the specific heat of air,
G is the weight air volume passing through the cooling/heating device 110 (KgA), θ0 is the supply air temperature, and θ1 is the return air temperature.

Therefore, if the heat fft (q S) to be supplied to the cooling/heating device 11 is determined according to FIG. 4, Reed's equation holds true in the case of a constant air volume system.

Here, in order to bring (θ.-〇,)-Δθ closer to Δθ8, floating control as shown in FIG. 6 is applied to the heating/cooling amount adjusting valve 17. Here, dθ is the predetermined width of the indestructible zone. In general, the response time of the amount of heat supplied by the cooling/heating device 11 is shorter than the opening/closing operation time of the heating/cooling amount adjustment valve 17, so it is unlikely that the valve will perform a hunting operation. If the operating time of the valve is short, the apparent operating time may be lengthened by performing a step operation. In other words, even if the amount of hot and cold water and the temperature of the cold and hot water fluctuate, the floating control can quickly improve the corrective action to bring it closer to ΔθS.

By the time the correction operation is completed, the amount of change in the amount of cooling and heating added to the circulating air is very small compared to the heat capacity of the living room, so the return air temperature does not change.

Effects of the Invention As described above, the present invention determines the amount of heat to be supplied to the cooling/heating device according to the deviation between the temperature setting value and the return air temperature, and thereby determines the difference between the supply air temperature and the return air temperature. By opening and closing the heating/cooling amount regulating valve so as to approach the target value, the amount of heat supplied will not change even if the temperature and flow rate of the heat medium supplied to the cooling/heating device fluctuate. Therefore, the flow rate of the heating medium
Controllability of indoor temperature can be improved without the need for expensive control equipment to maintain a constant temperature.

[Brief explanation of the drawing]

Figure 1 is a diagram of a conventional air conditioning system, Figure 2 is a diagram showing the relationship between the deviation between the temperature set value and the return air temperature and the valve opening degree in the case of heating in the conventional example, and Figure 3 is a diagram of the original air conditioning system. FIG. 4 is a diagram of an air conditioning system according to an embodiment of the invention, and FIG. [It is a diagram showing the deviation between the target value and the current value of the temperature difference before and after the coil, and the operating state of the heating and cooling amount adjustment valve. 11...Cooling/heating device, 12...Blower fan, 14...Control unit, 15...Return air temperature detector, 16... - Supply air temperature sensor, 17
...Heating and cooling amount adjustment valve. Name of representative Jl 1 Patent attorney Toshio Nakao and 1 other person Figure 1 Figure 2 Figure 2 Shell Teipe CTs) Figure 3 3 Dimensions - 1 Procedural Amendment 1 Display of Case 1982 Patent Application No. 152030 Bow 2 Invention Relationship with the person making the amendment to the name air conditioner 3 9.1' Application Address 1006 Oaza Kadoma, Kadoma City, Osaka Name (582) Matsushita Electric Industrial Co., Ltd. Representative 111 Toshihiko Shimo 4 Agent 571 Address: 1.006 Oaza Kadoma, Kadoma City, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. s 6. Contents of amendment (1) ``Indestructible zone'' on page 6, line 12 of the specification has been amended to ``1 dead zone.'' Masu.

Claims (1)

[Claims] An air conditioner main body having a blower fan and a cooling/heating device;
A heating/cooling adjustment valve that controls the amount of heat medium sent to the cooling/heating device, a supply air temperature detector, and a return air hot water temperature detection "i4: (
Then, the target value for the difference between the supply air temperature and the return air temperature is determined in accordance with the deviation between the set temperature and the return air temperature, and the opening and closing of the heating and cooling amount adjustment valve is controlled so as to bring it closer to the previous M1 month 1 target value. An air conditioner equipped with a control unit.