WHAT IS A DAMPER?
Damper is a mechanical device to stop or regulate the fluid flow in HVAC and Process Control. There are various types of dampers but they can be broadly classified in two categories based upon their industry of use.
HVAC Control Damper : The HVAC control damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature and climate control. Its operation can be manual, or motorised.
Industrial Damper : The industrial damper may be used to divert hot exhaust from gas turbine exhaust to recovery boiler, or to shut off process for maintenance, or to regulate gas or airflow in process control. Its operation can be manual or motorised.
Various applications of Industrial dampers are as follows:
i) Isolation dampers are used for isolation or shutoff for industrial process in extreme pressure and velocity systems.
Dampers having tight seal with minimum leakage and low pressure drop are suitable for this application.
ii) Control dampers are used for flow control in extreme pressure and velocity system. Dampers having better flow characteristics and control options to suit your application are recommended for this application.
FRESH AIR DAMPERS
Fresh air dampers are used to regulate the amount of fresh air intake in a building. Dampers with class I leakage and automatic control are required for this application, hence extruded aluminium, motorised airfoil damper can be used.
It is even better to monitor and regulate quality and quantity of air and control fresh air intake accordingly, for which CONAIRE VAQ stations are best suited.
RETURN AIR DAMPERS
Return air dampers are used to regulate return air from air conditioned spaces to the mixing box of air handler.
It is however better to select class I leakage but not necessary in this application. Automatic or manual control can be chosen for the damper, depending on whether return air is ducted into the mixing plenum or not.
EXHAUST AIR DAMPERS
Exhaust air dampers are used to exhaust balance return air. Exhaust air could be removed either locally or through a heat recovery unit. Pressure relief damper with automatic or manual control can be used for this application.
It is even better to monitor quantity of air, when air is exhausted through heat recovery so as to regulate the heat recovery drives speed, in which case CONAIRE VAQ stations are best suited.
ZONE CONTROL DAMPERS
Zone control dampers are used to regulate the amount of primary air in various zones. Dampers with class I leakage and automatic control are required for this application to provide climate control. Hence extruded aluminium motorised airfoil dampers with could be used.
It is even better to monitor and regulate quality and quantity of air in zone and control fresh air intake accordingly in response to the demand of critical zone among all zone fed through common fresh air through a air handler. thermostat CONAIRE VAQ stations are best suited in this scenario.
Ventilation dampers are used at fan's discharge/intake either as a backdraft damper to restrict flow in one direction or to regulate the amount of flow through fans. Dampers should be rated for velocity greater than 10 m/s at 1 kPa.