Tags: HVAC

Motors Uses on HVAC

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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 timing device for defrost timers and other sequenced operations. The fan and motor assembly are …

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HVAC Attic Fan Operation

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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 floor and the grilles in the ceiling or the attic floor be opened and the …

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HVAC Ventilation Air Volume

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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 air change for various types of spaces. In many cases, existing local regulations or codes …

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HVAC Fans and Blowers

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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 belt or direct drive motor. Avane-axial fan consists of a disk-type wheel mounted within a …

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HVAC Suitable Air-Duct Velocities

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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 and fan-housing velocity pressures are interdependent for good operating conditions. Fan-outlet velocities are also affected …

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HVAC Air-Duct Systems

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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: ? Compute the total amount of air to be handled per minute by the fan, as …

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