SU1216575A1 - Air conditioner - Google Patents

Description

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The invention relates to air conditioning technology.

The aim of the invention is to improve the accuracy of the regulation of air parameters, efficiency and reliability in operation.

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FIG. 1 is a schematic diagram of an air conditioning unit with a bypass line with a control valve of the first section of the heater along the heating section of the heater unit in FIG. 2 - installation of air conditioning with an additional bypass line and a two-position valve of the second section of the heater along the heating medium; in fig. 3 - installation of air conditioning with a second preheater heater.

The air conditioning unit comprises a heater 2 (Figures 1 and 2) located in duct 1 along the air path, with direct and return ducts 3 and 4, a contact apparatus 5 and a supercharger 6.

The heater 2 is connected to the direct and return pipelines 3 and 4, respectively, to the supply and return pipes 7 and 8 of the heat network and is made of two sections 9 and 10 installed parallel to each other in channel 1 by air and connected by jumper 11 sequentially through the coolant.

The bypass line 12 (Fig. 1) with the control valve 13 is connected to the supply line 7 and the bridge 11, and the latter is connected through an additional pipe 14, with a two-position valve 15 (.Fig. 2) with a return pipe 4 of the heater 2.

The air conditioning unit may also contain a second preheating heater 16, which is located in channel 1 after the contact device 5 along the air flow (Fig. 3) and is connected by direct and return pipelines 17 and 18, respectively, to the heating network supply line 7 and the bridge 1t of the heater 2 first heating.

As a contact apparatus 5, an irrigation chamber (Fig. 1), or an apparatus with an irrigation head (Fig. 2), or an apparatus with an irrigated heat exchanger (Fig. 3) can be used.

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Each section 9 and 10 of the heater 2 may contain a different number of heat exchangers installed in series along the air flow and interconnected in series or parallel across the coolant.

The heater 16 of the second heating (FIG. 3) can also be connected to a self-mixing or

boiler plants (not shown),

providing year-round constant heat carrier temperature at the entrance to the direct pipe 17 of the heater 16. Return pipeline 18

the heater 16 of the second heating can be connected to the return pipe 4 cal9Rifera 2 of the first heating (not shown).

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The installation can also be equipped with a bypass air channel 19 of the second preheating heater 16, a dual air valve 20 installed in front of the heater 16, and the heat exchanger 21 (FIG. 3) of the KOHTciKTHoro apparatus 5 with direct and return pipelines 22 and 23 for supplying it heat or cold carrier.

For the circulation of water in the contact apparatus 5, the installation can be equipped with a circulation pump 24 connected to the circulation circuit 25.

The unit can be cooled by connecting it with pipes 22 and 23 to a cooling system (not shown).

To further adjust the thermal performance of the first preheater heater 2, a control valve 26 can be used installed on the direct pipe 3 and connected via an ACS (not shown) to the temperature sensor 27 installed in channel 1 behind the contact device 5. The temperature sensor 27 can also be connected to the control valve 13.

The cooling capacity of the air conditioning unit can be controlled by means of a regulating valve 28 installed in the pipe 22 of the heat exchanger 21 (FIG. 2) and connected by means of an ACS to the temperature sensor 27 or by means of a three-way valve (not shown) that is connected to the circulating circuit 25 at the inlet of the circulation pump 24 of the contact apparatus 5. The sprinkler of the contact apparatus 5 can be connected to a water supply system (not shown). A three-way valve can be connected via an ACS with a temperature sensor 27 or with a temperature sensor installed in a room (not shown).

If a heater 16 is installed in the unit (Fig. 3), its heat output can be regulated by means of a control valve 29 installed in the return pipe 18 and connected via an ACS to the intake air temperature sensor 30 or the air temperature sensor in the room (not shown).

In order to further adjust the thermal performance of the second preheating heater 16 at a variable temperature of the coolant flowing into it and the maximum thermal load of the heater 16 constant throughout the year, a coolant temperature sensor 31 can be installed in the pipe 17 connected by means of an ACS with a two-section air regulator valve 20.

To stabilize the temperature of the coolant returned to the heating system after the heater 2, a temperature sensor 32 is installed on the pipe 4. The temperature control of the air inlet to the heater 2 is carried out by means of a temperature sensor 33 installed in channel 1 in front of the heater 2. The sensors 32 and 33 of the temperature are connected through the ACS with valves 13 and 26 (Fig. 1) or with valves 13 and 15 (Fig. 2 and 3).

The communication of sensors by means of ACS with executive bodies is shown by communication lines, on which the arrows indicate the direction of the control action, while the control action on the executive bodies can be transmitted in pulses or continuously (analogue control law).

If it is necessary to completely disconnect section 10 of the heater 2 from the heat supply source at positive air temperatures, at the entrance to the installation, a shut-off element 34 can be installed on the pipe 4 (Fig. 3).

The installation works as follows.

Air is blown by compressor 6 into channel 1, divided into two streams and passed through sections 9 and 10 of heater 2, where it is heated in the cold period of the year, then both air streams are connected and passed through contact apparatus 5, where air is humidified adiabatically upon contact with water or cooled in the warm period of the year (Fig. 3), reaching the desired thermal and moisture parameters after the contact apparatus 5,

after which it can be heated to

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set temperature in the heater 16 of the second heating (Fig. 3). 06- work in the listed elements of the installation air blower 6

served in the room.

The air temperature behind the contact machine is maintained automatically by the signal of the temperature sensor 27 by acting on the valves 13 and 26 (Fig. 1) or on the valve 26 (Fig. 2), or on the valves 26 and 28 (Fig. 3).

When the temperature of the air behind the contact device 5 drops below a predetermined value, the control system opens the control valve 13 by the signal from the temperature sensor 27, and the valve 26 is closed or turned off (Fig. 2 and 3) until the air temperature reaches the set value

quantities. With a fully open valve 13 (Fig. 1) and a further decrease in the air temperature of the ACS, according to a signal from the temperature sensor 27, opens valve 26 until the air temperature reaches a predetermined value. When the air temperature rises, the regulation is carried out in reverse order. When the valve 26 is fully closed, the regulation is transferred to the valve 28 (Fig. 3).

When used in the installation of the heater 16 second heating when

lowering the supply air temperature below the setpoint of the ACS based on a signal from the sensor 30 opens the control valve 29 and, conversely, the valve 29 when the temperature rises

closes.

The temperature of the coolant in the pipe wire 4 is maintained at a constant predetermined level by

VIA SAU.na valve 13 on the signal of the sensor 32 of the temperature of the coolant in the pipe 4, which are connected to the work on the signal of the sensor 33 of the air temperature PA input into the installation.

When the temperature of the coolant in the pipe 4 falls below the predetermined ACS, the control valve 13 opens according to a signal from the temperature sensor 32 until the coolant temperature reaches the specified value. Opening and closing of the control valve 13 leads to a change in the flow rate of the coolant through section 10 of the heater 2. The increase in the flow rate of the coolant through section 10 is accompanied by a corresponding increase in the initial and final temperature of the coolant, passage n (through section 10, and a decrease in the flow rate of the coolant through section 9, Since the section 9 is located along the coolant first, then a change in the coolant flow rate through it leads to an insignificant decrease in the coolant temperature at its output and, therefore, the eye It is essential to control the heat output of the heater 2 by means of the control valve 26, while ensuring reliable freezing of the heat carrier in the latter 10 along the heat carrier section 10 without affecting the accuracy

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When the air temperature at the inlet to the ACS installation increases, according to a signal from the temperature sensor 33, opens the two-position valve 15 and completely closes the control valve 13 (FIGS. 2 and 3), or completely closes the valve 26 (FIG. 1), switching the control to valve 13. V In this case, a partial or complete shutdown of part of the heat exchanging surface of the heater 2 from the heat carrier occurs (in FIG. 1, section 9j in FIGS. 2 and 3 is disconnected, the flow of heat carrier through section 10 is reduced by passing its main part through an additional pipeline 14, that is, partial shutdown of section 10), the need for partial shutdown of the heat exchange surface of the heater 2 is determined by the mode of controlling the temperature of the coolant according to the schedule of the heat network because the heat exchange surface of the heater 2 is accepted for the calculated winter conditions and provides the required heat efficiency, heater 2 during the cold period of the year, and therefore partial shutdown of the heat exchange surface allows to avoid overheating of the treated air in others ( even) modes of plant operation.

FIG. 2

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Claims (3)

1. INSTALLATION OF AIR CONDITIONING, comprising an air heater with direct and return pipelines located in the air duct, a contact apparatus and a supercharger, the heater being connected by direct and return pipelines to the supply and return pipelines of the heating network, respectively, which , in order to improve the accuracy of regulation of the heat and humidity parameters of the air, efficiency and reliability, it is equipped with a bypass pipe with a control valve and a jumper, the air heater is made of two seconds units installed in the channel parallel to one another over the air and connected by a jumper in series with the coolant, while the bypass pipe with a control valve is connected to the supply pipe and to the jumper. 2. The installation according to claim ^, characterized in that it is equipped with an additional pipeline with a two-position valve, while an additional pipe with a two-position valve is connected to the jumper and the return pipe of the air heater. 3. Installation according to paragraphs. 1 and 2, characterized in that it is equipped with a second heating coil with direct and return pipelines, while the second heating coil is located in the channel after the contact apparatus along the air flow and is connected by a direct pipe to the supply pipe of the heating network, and a return pipe to the jumper first heater <o Wtn.f SU.,., 1216575>