SYSTEM COMPATIBILITY

SMART DIFFUSERS can be universally applied to most air conditioning equipment designs:

• Unitary heat pumps and HVAC units

• Central HVAC, A/C and air handling units

• Gas, electric, hot water and steam heating systems

• HVAC, reheat, fan powered, double duct, radiant panels, and baseboard radiation heating methods

Bi-metallic and wax type thermal thermostatic actuators replace wall and duct thermostats, and electric or pneumatic damper actuators.

The control systems are entirely self-contained to eliminate installation, electrical wiring, pneumatic piping, and added system pressures.

Room air is induced past the temperature control actuators to provide accurate VAV temperature control. Actuators which react to the temperature of the supply air are located within the supply air path.

Control temperature set-points are simply adjusted to provide proportionally modulating control within a restricted temperature span.

APPLICATIONS

The use of a single HVAC unit, applied to provide heating and cooling comfort conditions, in a multiple exposure building, has NOT been universally successful. The major problems can be minimized by using Smart Diffusers:

1. When the heating cycle is in operation, those areas requiring no heat or, in fact, requiring cooling must shut off or they will be over heated.

2. When the cooling cycle is in operation those requiring no cooling or, in fact, requiring heating must shut off or they will be over cooled.

3. The interior space will always represent a cooling load while the exterior space may require either heating or cooling. When the heating cycle is in operation the air flow to the interior space must shut off to prevent over heating.

4. The VAV damper / square “dumb” diffuser systems will over heat then over cool to compensate, then repeat the same. The major functional problem is created during the heating cycle particularly when the heated supply air volume is decreased. The stratification of warm air at the ceiling prevents the space comfort temperature from being obtained or maintained without over heating.

The prolonged operating cycles eliminate the minimum comfort ventilation volumes from being supplied to interior diffuser volumes and demand spaces.

5. When the supply air temperature reset is used to prevent short cycling between cooling and heating the interior diffuser volumes vary between 0 and 250% of that required with a 55 degree supply air temperature. Interior comfort levels are impossible to maintain.

Smart Diffusers are as applicable to solve the problems of a typical VAV zone as they are to:

a. a single room
b. an exposure
c. an exposure with a corner office
d. 2 exposures
e. 3 exposures
f. the whole building
g. or just an interior room

They are applicable to both new and existing systems. They are applicable to unitary heat pumps, single and multiple HVAC units, central air handlers and large built systems.

Dx or chilled water - Electric, hot water, gas or steam heating - Fan Volume, Fan by-pass or unit by-pass control. "First cost" economics are a major concern in the building or remodeling of any system. But its the first cost versus the total result that ís important. Provide a smarter system design. Don’t just put in cheaper products.

DUCT LOOP SYSTEMS

The duct loop is a simple method of achieving the same pressure at the nearest and farthest SMART DIFFUSER duct connections.

The main duct(s), between the unit and the loop, are sizes at 1500 to 2000 fpm. The duct is a constant size starting at 1500 fpm. from the main.

The interior units are sized at the volume demand represented by the lowest differential temperature (8 to 10 degrees cooling).

The exterior units are also sized at the lowest differential temperature to provide the maximum exterior winter cooling demand volumes. Multiple branch ducts are sized at a maximum of .15” wg. loss.

The relief by-pass may also be applicable. It eliminates the need for the by-pass damper and duct loop. The design is the same for any constant volume system.

The SMART DIFFUSERS simply by-pass the excess air not required to satisfy the space temperature. The system remains constant volume while the individual room volumes are varied by the respective room temperatures.