Tag Archives for HVAC

Motors Uses on HVAC

As previously mentioned, this type of motor is used as a fan motor in refrigerators and freezers and in some types of air-conditioning equipment where the demand is not too great. It can also be used as part of a … Continue reading

07. January 2011 by admin
Categories: Electric Motors | Tags: , , | Leave a comment

HVAC Attic Fan Operation

The routine of operation to secure the best and most efficient results with an attic fan is important. Atypical operating routine might require that, in the late afternoon when the outdoor temperature begins to fall, the windows on the first … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Ventilation Air Volume

The volume of air required is determined by the size of the space to be ventilated and the number of times per hour that the air in the space is to be changed. Table 3-4 shows the recommended rate of … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Fans and Blowers

Various types of fans are used in air-conditioning applications and are classified as propeller, tube-axial, vane-axial, and centrifugal. The propeller and tube-axial fans consist of a propeller or disk-type wheel mounted inside a ring or plate and driven by a … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Suitable Air-Duct Velocities

Table 3-2 gives the recommended air velocities in feet per minute for different requirements. These air velocities are in accordance with good practice. It should be understood that the fanoutlet velocities depend somewhat on the static pressure, as static pressures … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Air-Duct Systems

Air ducts for transmission of air in a forced-air heating, ventilation, or air-conditioner system must be carefully designed from the standpoint of economy, as well as for proper functioning. When designing air ducts, the following methods may be used: ? … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment

HVAC Dry Filters

Dry filters are usually made in standard units of definite rated capacity and resistance to the passage of air. At the time the installation is designed, ample filter area must be included so that the air velocity passing through the … Continue reading

04. January 2011 by admin
Categories: Ventilation Requirements | Tags: , | Leave a comment