Application Considerations, Abbreviations

Application Considerations

This section assists the system designer in application and control of Trane Q and Super Q II fans. Satisfactory distribution of conditioned air requires a properly chosen fan and a well designed duct system.

Abbreviations

sp ...... static pressure (in. of water)

vp ...... velocity pressure (in. of water)

tp ....... total pressure (in. of water)

ov ...... outlet velocity (ft per minute)

rpm ... fan speed (revolutions per min.) bhp ... brake horsepower

p ........ air density (lbs/ft3)

db ...... decibel (sound power or sound

pressure level) cps .... cycles per second

cfm .... cubic feet of air per min. at any

density

scfm .. cubic feet per min. of standard air clean, dry air with a density of

0.075 lbs/ft3 at 70 F and a barometer reading of 29.92- inches Hg)

The System

System Curve

At a fixed volume flow rate (cfm) through a given air system, a corresponding pressure loss, or resistance to this flow, will exist. If the flow rate is changed, the resulting pressure loss, or resistance to flow, will also change. The relationship governing this change for most systems is:

PRESSUREc/PRESSURE = (CFMc/CFM)2

The characteristic curve of a typical “fixed system” plots as a parabola in accordance with the above relationship.Typical plots of the resistance to flow versus volume flow rate are shown with normalized duct system curves, Figure A-1.

For a fixed system, an increase or decrease in system resistance results from an increase or decrease in the volume flow rate along the given system curve only.

Refer to Duct System A, Figure A-1. Assume a system design point at

100 percent volume and 100 percent resistance. If the volume flow rate is increased to 120 percent of design volume, the system resistance will increase to 144 percent of the design resistance in accordance with the system equation. A further increase in volume results in a corresponding increase in system pressure. A decrease in volume flow to 50 percent results in a 75 percent reduction in design resistance.

An air system may consist of a fan, ductwork, air control dampers, cooling coils, heating coils, filters, diffusers, noise attenuation, turning vanes, etc. The fan is the component in the system which provides energy to the airstream to overcome the resistance to flow of the other components.

System Component Losses Every system has a combined resistance to flow which is usually different from every other system and is dependent upon the individual components in the system. The determination of the “pressure loss” or “resistance to flow,” for the individual components can be obtained from the component manufacturers. The determination of pressure losses for ductwork and branch piping design is well documented in standard handbooks such as the ASHRAE Handbook of Fundamentals.

Figure A-1 — Normalized Duct System Curves

Fan specifications

Trane is a well-known name in the heating, ventilation, and air conditioning (HVAC) industry, and one of their standout products is the Trane Fan. Designed to provide efficient and effective airflow, the Trane Fan is a versatile solution suited for both residential and commercial applications.

One of the main features of the Trane Fan is its Energy Efficiency. With increasing energy costs, having a fan that operates efficiently is crucial. Trane fans are designed with advanced motor technology that enhances performance while reducing energy consumption. This not only helps lower utility bills but also contributes to a more sustainable environment.

The Variable Speed Technology is another notable characteristic. Trane fans come equipped with variable speed motors that adjust the airflow according to the specific needs of a space. This adaptability means that the fan can run at lower speeds, providing quiet operation while maintaining comfort levels, and ramping up power when needed for more intense cooling or ventilation.

Durability and robustness are core attributes of Trane fans. Constructed from high-quality materials, these fans are built to withstand harsh conditions and continue to function optimally over time. This longevity is essential for commercial settings where reliability is paramount.

Additionally, Trane delivers innovative sound-reduction technologies within their fan designs. Special engineering ensures that these units operate quietly, making them ideal for environments such as offices, schools, and homes where noise can be a distraction.

Another significant aspect is Smart Technology Integration. Trane fans are compatible with various smart home systems, allowing users to control their systems remotely. This feature enhances convenience, enabling homeowners and facility managers to monitor and adjust air quality effortlessly.

In terms of ease of installation, Trane Fans are designed with user-friendly features that facilitate quicker setup and less hassle. Their modular designs allow for flexibility in installation across various applications.

In summary, the Trane Fan stands out due to its energy efficiency, variable speed technology, durability, sound-reduction capabilities, smart technology integration, and ease of installation. These characteristics make Trane fans a reliable choice for enhancing indoor air quality across diverse environments.