Design of the automation system for supply and exhaust ventilation

We have designed and installed the automation system for supply and exhaust ventilation. Installations equipped with heat exchangers, steam humidifiers to maintain the climate in the reconstructed Sports Complex. NDP completed successfully. Mounted ACS Refrigeration center.

This section of the project was developed on the basis of an approved Technical Specification for the design of a sports complex facility. The main objects of building automation are: - general ventilation; - a complex of fire prevention and smoke protection measures. - sewage system; - cooling system.

ACS manages:

- circulating pumps of the cold supply system;

- pumps for charging the cold supply circuit;

- also the ShchHM1 switchboard provides communication via the system bus to the ShchHM switchboards and the control tower.

1.1 The ventilation system P4 is controlled from the SchA1 control panel, located in the room.

1.2 Turning on the system.

DESIGNING THE AUTOMATION OF ENGINEERING SYSTEMS

The command to turn on the system is to switch the switch on the switchboard to the “Start” position or the signal from the control room computer, while the keys for selecting the fan and pump control mode located in the power shield of the “EM” section should be in the “Auto” position.

The sequence of starting the system and maintaining the TVR of air depends on the outdoor temperature. The “Winter-Summer” mode is selected by a switch on the shield or automatically by the outdoor temperature sensor (temperature sensor TE1).

In the "Summer" mode after the command to turn on the system:

- the P4 fan engine turns on;

- the outside air damper Y1 opens;

- the valve on the coolant Y3 switches to the mode of maintaining the set value of the supply air temperature (temperature sensor TE3);

In the "Winter" mode, the sequence of switching on the system is as follows:

- the valve Y2 on the heat carrier is opened for 100%;

- the pump on the coolant is turned on;

- the P4 fan motor turns on and the outside air damper Y1 opens;

- valve Y2 switches to temperature setpoint maintenance mode (temperature sensor TE3);

1.3 System shutdown.

The command to turn off the system is to switch the switch on the switchboard to the “Stop” position, or a signal from the control room computer or to switch the keys for selecting the control mode of the fans or the pump from the “Auto” position to the “Off” position.

Wherein:

- the working motor of the P4 fan is turned off;

- the outside air damper closes;

- the pump on the heat carrier is turned off.

1.4 Protection of the air heater against freezing.

Protection of the heater against freezing is carried out in two modes:

- the system is turned on;

- the system is disabled.

In the system-on mode, when the temperature of the return heat carrier drops below + 25 ° C (temperature sensor TE2) and the air temperature behind the heater (temperature sensor TS) below + 5 ° C, it happens:

- shutdown of the fan;

- closing the outside air damper;

- the opening of the valve Y2 on the coolant to 100%.

In the system off mode, when the temperature of the return coolant drops below + 25 ° C (temperature sensor TE2), the valve Y2 on the coolant opens to 100% and the pump starts on the coolant.

1.5 Emergency shutdown system.

The emergency shutdown of the system is carried out when the following signals arrive at the controller of the board:

- the threat of freezing of the air heater (thermostat triggering by air - temperature sensor TS and temperature sensor for return heat carrier);

- pump failure (motor overload protection triggered);

- “fire” from the fire alarm device (the signal comes from the MCPS board).

2. Light alarm on the shield.

To monitor the state of the system on the panel provides a light alarm:

- presence of voltage;

- P4 fan is on (closing the contact of the magnetic starter);

- the threat of freezing of the heater (air thermostat tripping - temperature sensor TS or sensor TE2 on the return heat carrier);

- the coarse filter is dirty (the pressure differential sensor trips on the PDS1 filter);

- the fine filter is dirty (triggered by the differential pressure sensor on the PDS2 filter);

- the pump is on (closing the contact of the magnetic starter);

- pump failure (motor overload protection triggered).

3. For the P2 ventilation system, the initial requirements are similar to the P4 system.

4. Description of the work of the PV1 system.

4.1 The ventilation system PV1 is controlled from the 2-SchA1 control panel, located in the room. 201

4.2 Turning on the system.

The command to turn on the system is to switch the switch on the switchboard to the “Start” position or the signal from the control room computer, while the selection keys for controlling the fans and the pump located in the power shield of the “EM” section should be in the “Auto” position.

The sequence of starting the system and maintaining the TVR of air depends on the outdoor temperature. The “Winter-Summer” mode is selected by a switch on the shield or automatically by the outdoor temperature sensor (temperature sensor TE1).

In the "Summer" mode after the command to turn on the system:

- the motors of the fan P1 turn on;

- the fan motor V1 is turned on;

- the outside air damper Y1 opens;

- the exhaust air valve Y4 opens;

- the valve on the coolant Y3 goes into the mode of maintaining the set value of the air temperature in the pool room (temperature and humidity sensors TME5 ... TME8, signals from the sensors on the system bus come from the SchUK1 switchboard);

In the "Winter" mode, the sequence of switching on the system is as follows:

- the valve Y2 on the heat carrier is opened for 100%;

- the pump on the coolant is turned on;

- the P1 fan motor turns on and the outside flap opens

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