FR2690734A1 - Air conditioning system esp. for industrial buildings - has forced draught fan unit with heating, cooling and humidifying facilities and programmable operating cycle. - Google Patents

Abstract

The fan unit (4) draws exterior (5) and recirculates interior (6) air in controllable proportions, the former passing through a cooler (20) and both through a heater (19). Fresh, and, opt., recirculated flows are filtered. Through the controller (17), flow sensors (12,13) keep the total flow constant. A third sensor (14), on the discharge vent (9), equates inward (5) and outward (11) flows. A humidifying spray (7) at the fan unit is controlled (17) by hygrometric sensors (16), and heating and cooling units, similarly, by thermal sensors (15). Account is also taken through an electrical demand sensor (18), of heat produced by the installed plant (2). Plant operating schedules can be keyed into the controller's memory (17), giving overall timed programs. ADVANTAGE - Effective humidity and temperature control with optimum power economy.

Description

 The present invention relates to an air conditioning device.

 Currently known devices with adiabatic operation do not allow separate control of the degree of humidity and the temperature of a room.

They also have a very high energy consumption.

The object of the present invention is to present a device which separately controls the humidity and the temperature with reduced electrical consumption.

 For this purpose, the device which is the subject of the present invention comprises, in the room to be air conditioned, a means for blowing air into said room and a means for sucking air from said room and a sprayer. An ambient temperature sensor and a hygrometry sensor are electrically connected to a computer controlling, according to the information coming from the ambient temperature sensor and the hygrometry sensor, five functions - an incoming air flow control of the outside the room in the blowing means, - a control of the flow of recycled air entering the blowing means, - a control of the flow of air leaving the room by the suction means, - a spray control and a cold battery.

 The description which follows, given for explanatory purposes and in no way limitative with regard to the appended drawings, makes it possible to better understand the advantages, aims and characteristics of the invention.

 Figure 1 shows a sectional view of an industrial premises equipped with the device.

 FIG. 2 represents a block diagram of the electrical connections between the different parts of the device presented in FIG. 1.

 FIG. 3 represents a sectional view of a blowing means of the device presented in FIG. 1.

 In FIG. 1 are shown an industrial premises comprising thermal loads 2 and walls 3, a blowing means 4 placed on a first wall 3 and comprising a hot battery 19, a cold battery 20, an inlet 5 for air outside the room 1, an inlet 6 for recycled air in room 1 and an air outlet 7 for room 1, a sprayer 8 comprising an electric control 21 and attached to the blowing means. 4, a suction means 9 placed on a second wall 3 and comprising an air inlet 10 for room 1 and an air outlet 11 for outside room 1.

The outside air inlet 5 is provided with a flow control 12.

The inlet 6 for recycled air is provided with a flow control 13. The air inlet 10 for room 1 is provided with a flow control 14. A temperature sensor 15 and a hygrometry sensor 16 are placed near the thermal loads 2. A computer 17 is placed in the room 1. Finally, an electrical consumption sensor 18 is placed on the electrical supply network of the thermal loads 2.

 The thermal loads 2 are generally industrial machines. Their operation generates heat in room 1.

 The walls 3 which respectively support the blowing means 4 and the suction means 9 are opposite.

However, the blowing means 4 and the suction means 9 can be placed on adjoining walls.

 The blowing means 4 and the flow controls 12, 13 and 14 are shown in FIG. 3.

The air inlets 5, 6 and 10 and the air outlets 7 and 11 are of known type, preferably without piping.

 The sprayer 8 is attached to the blowing means 4. The temperature sensor 15 is of known type.

It provides an electrical signal representative of the temperature of the ambient air near the thermal loads 2.

 The hygrometry sensor 16 is of known type. I1 provides an electrical signal representative of the humidity of the ambient air near the thermal loads 2.

 The consumption sensor 18 is of known type. It provides an electrical signal representative of the electrical consumption of thermal loads 2.

 The hot coil 19 is of a known type, for example with resistance, adapted to heat the air circulating in the blowing means 4.

 The cold battery 20 is of known type and adapted to cool the air circulating in the blowing means 4.

 The electrical control 21 controls the operation of the sprayer 8 as a function of an electrical signal. It is of known type, for example solenoid valve.

 The operation of the device being controlled by the computer 17 is described with FIG. 2.

 In FIG. 2 are shown the computer 17 connected on the one hand to the sensors 15, 16 and 18 and on the other hand, to the flow controls 12, 13 and 14, to the hot batteries 19 and cold 20, and to the electrical control 21 of sprayer 8.

The computer 17 comprises a keyboard 23, a memory 24, a clock 25, threshold crossing detectors 26, 27, 28, 29, 31 and 32 a processor 30.

 The keyboard is of known type.

 The memory 24 is of known type. It allows the user to keep the temperature and humidity instructions given by the keyboard or by the manufacturer, the closing dates of room 1, the hours of activity in room 1 and the thermal efficiency thermal loads 2.

 Clock 25 is of known type. It electrically supplies time and date information.

 The threshold crossing detector 26 compares the signals from the temperature sensor 15 to a value given by the processor 30 and provides a signal when the first is lower than the second.

The threshold crossing detector 27 compares the signals from the temperature sensor 15 to a value given by the processor 30 and provides a signal when the first is greater than the second.

 The threshold crossing detector 28 compares the signals from the humidity sensor 16 to a value given by the processor 30 and provides a signal when the first is less than the second.

 The threshold crossing detector 29 controls the signals coming from the humidity sensor 16 to a value given by the processor 30 and provides a signal when the first is greater than the second.

 The threshold crossing detector 31 compares the signals coming from the hygrometry sensor 18 with a value given by the processor 30 and provides a signal when the first is lower than the second.

 The threshold crossing detector 32 compares the signals from the hygrometry sensor 18 to a value given by the processor 30 and provides a signal when the first is greater than the second.

 The processor 30 is of known type. It is, for example made up of a microprocessor or a microcontroller.

 Alternatively,. digital analog converters are placed between the processor 30 and the sensors 15, 16 and 17 and replace the threshold crossing detectors 26, 27, 28, 29, 31 and 32. In this way, the precision of the calculations made by the processor is bigger.

 According to a second variant, analog digital converters are electrically placed between the processor 30 and the flow controls 12, 13 and 14, the hot batteries 19 and cold 20, the dehumidifier 22 and the electrical control 21 of the sprayer 8. From this way, the operations of the controls are more graduated and more precise.

Depending on the threshold crossing signals it receives from the detectors 26, 27, 28, 29, 31 and 32 and the clock 25, the processor 30 controls the flow controls 12, 13, 14, the battories 19 and 20, the dehumidifier 22 and the electrical control 21 according to algorithms partially described below:
In winter, or more generally when the threshold crossing detector 26 emits a signal, sign @ l which corresponds to a heating requirement, the air flows entering through inputs 5 and 10 are zero and the air flow entering through entry 6 is maximum. The hot hatterie 19 is a3 ors in operation of such. way that. ai r the crossing is reheated until the detector of crossing soil 26 srrission the emission of the signal.

 In spring and autumn, or more generally when the soil crossing detector 27 emits a signal, a signal which corresponds to a need for cooling, the area 5 is opened by the command 12 according to thermal equations not recalled here .

The air release onontree 6 is then controlled by the control 13 13 so that a sum of the air flow rates through the inputs 5 and 6 is conetante. The control means 14 controls an opening of the inlet 10 so that the air flow entering through the inlet 5 is equal to the air flow leaving through the outlet 11, the pressure in the room 1 thus remaining constant .

 In summer, or generally longer when the threshold crossing detector 27 emits a signal and when, by calculation with equations not @@ ppoléca ioi applied to the temperature information supplied by the temperature sensor 15 and to the thermal loads pre-assembled and in operation in room 1, information supplied by the consumption sensor 18, the processor 30 determines a need for cooling the outside air, the inlet 6 is closed, the entrances 5 and 10 are open so that the air flows passing through them are maximum and the cold coil 20 is put into operation.

 The control of the humidity around the reference value kept by the memory 24 is carried out by the operating control of the sprayer 8 and of the input 5 according to the thermodynamic operating equations which are not recalled here.

 The heating of the room 1 before the thermal loads 2 are put into operation is controlled as a function of the working hours and the working dates kept in the memory 24 and of the information supplied by the clock 25.

This heating is carried out with a zero air flow in the inputs 5 and 10 and maximum in the input 6 and an operation of the hot battery 19. When the thermal loads 2 are put into operation, the operation of the hot battery 19 is progressively reduced so that the sum of the electrical consumptions of the thermal loads 2 and of the hot battery 19 is constant.

 The values emitted by the processor 30 to the threshold crossing detectors 26, 27, 28, 29, 31 and 32 are obtained by calculations according to equations not described here.

 In FIG. 3 are shown the blowing means 4 comprising the hot battery 19, the cold battery 20, the inlet 5 for outside air at 7 OC? 1, inlet E of recycled air in room 1 and the air outlet 7 in room 1, the sprayer 8 comprising an electric control 21 and attached to the blowing means 4. The inlet 5 of outside air is provided of the flow control 12. The inlet 6 for recycled air is provided with the flow control 13. A filter 33 is placed in the air inlet 5. A fan 34 is placed in front of the air outlet 7 A high pressure pump 35 is connected to the sprayer 8. The sprayer 8 has an atomizing nozzle 36.

 Depending on the applications and the machines present in room 1, the filter 33 can filter only the air entering through inlet 5, as in FIG. 3, or all the air entering through the two inlets 5 and 6.

 The operation of the fan 34, by reversing the air flow for short periods, makes it possible to prevent clogging of the filter 33.

Claims (10)

CLAIMS:  1. Air conditioning device of a room (1) comprising a blowing means (4) of air in said room and a suction means (9) of air from said room characterized in that it further comprises a sprayer (8) and, connected to a computer (17), an ambient temperature sensor (15), a humidity sensor (16), said computer (17) controlling on the basis of information coming from the ambient temperature sensor and from the hygrometry sensor, a control (12) for the flow of air entering from outside the room (1) into the blowing means (4), a control (13) for the flow of recycled air entering the blowing means (4), a control (14) for air flow leaving the room outside by the suction means (9), a spraying control (21) and a cold battery control (20) .  2. Device according to claim 1 characterized in that it further comprises a hot battery (19) adapted to heat the air passing through the blowing means (4) and electrically connected to the computer (17) controlling the operation of said battery hot.  3. Device according to any one of the preceding claims, characterized in that it further comprises an electrical consumption sensor (18) electrically connected to the computer (17).  4. Device according to any one of the preceding claims, characterized in that the computer (17) comprises a memory (24) adapted to store Qes C: I- of temperature and hygrometry and of the thermal yields of the thermal loads (2) .  5. Device according to any one of the preceding claims, characterized in that the computer (17) includes a clock (25) adapted to provide time and date information.  6. Device according to any one of the preceding claims, characterized in that the computer (17) comprises a processor (30) and at least one threshold crossing detector (26, 27, 28, 29, 31, 32) adapted to comparing the signals from the sensors (15, 16, 18) to values provided by the processor (30) and providing the processor (30) with a threshold crossing signal.  7. Device according to any one of the preceding claims, characterized in that the computer (17) comprises a processor (30) and at least one analog-digital converter connected at the input to a sensor (15, 16, 18) and at the output to the converter (30).  8. Device according to any one of the preceding claims, characterized in that it comprises a filter (33) filtering the air passing through the two inlets (5, 6) of the blowing means (4).  9. A method of air conditioning a room characterized in that it controls, as a function of the ambient temperature and the ambient humidity, a sprayer (8), the flow of air entering the room, the flow of air recycled in said room, the air flow leaving the room and a cold battery (20).  10. Method according to claim 9 characterized in that according to the electrical consumption of the thermal loads placed in the room and their thermal efficiency, a hot battery (19) is controlled so that the total consumption is approximately constant .