ANSI/ AMCA 220:2005 pdf download.Laboratory Methods of Testing Air Curtain Units for Aerodynamic Performance Rating.
3.2.4 Power, energy, and torque. The unit of power is the watt (W); the I-P unit is the horsepower (hp). The unit of energy is the joule (J); the I-P unit is the foot-pound (ft Ib). The unit of torque is the Newton- meter (Nm); the I-P unit is the pound-inch (lb in.).
3.2.5 Efficiency. Efficiency is expressed on a per- unit basis. Percentage values can be obtained by multiplying by 100.
3.2.6 Rotational speed. There is no unit of rotational speed as-such in the SI system of units. The commonly used unit in both systems is the revolution per minute (rpm).
3.2.7 Gas properties. The unit of density is the kilogram per cubic meter (kg/rn3); the I-P unit is the pound-mass per cubic foot (lbm/ft3). The unit of viscosity is the Pascal second (Pas); the I-P unit is the pound-mass per foot-second (lbm/ft’s). The unit of gas constant is the joule per kilogram kelvin (J/kgK); the I-P unit is the foot-pound per pound- mass degree Rankine (ft’lb/lb°R).
3.2.8 Dimensionless groups. Various dimensionless quantities appear in the text. Any consistent system of units may be employed to evaluate these quantities unless a numerical factor is included, in which case units must be as specified.
3.2.9 Physical constants The value of standard gravitational acceleration shall be taken as 9.80665 rn/s2 at mean sea level at 450 latitude: the I-P value is 32,1740 fj52 at mean sea level at 450 latitude (1). The density of distilled water at saturation pressure shall be taken as 998.278 kg/rn3 at 20 °C; the I-P value is 62.3205 Ibm/ft3 68 °F [2). The density of mercury at saturation pressure shall be taken as 13595.1 kg/rn3 at 0 C; the I-P value is 848.714 Ibm/ft3 at 32 °F (2). The specific weights in kg/rn3 (lbm/ft3) of these fluids in vacuo under standard gravity are numerically equal to their densities at corresponding temperatures.
4. Instruments and Methods of Measurement
Instruments and methods of measurement shall be in compliance with ANSI/AMCA 210 except where specifically noted.
4.1 Air curtain core velocity measurement
Air curtain core velocity shall be measured with a Pitot-static tube and manometer, a hot-wire anemometer, or any other device which has an accuracy of ±5.0% of the air velocity being measured. Refer to Section 6.2 for details.
4.2 Power
Power shall be measured with a wattmeter having a certified accuracy of ± 1% of the observed reading.
5. Equipment and Setups
5.1 Air curtain airflow rate test
The air curtain unit shall be mounted with its inlet sealed to the test chamber in compliance with the requirements of Figure 1A. The seal shall be adequate enough to minimize leakage. The air discharge nozzle or adjustable vanes in the air discharge nozzle shall be set so as to provide a 15 ± 1 angle as shown in Figure 18.
5.2 Air velocity projection and outlet air velocity uniformity test
The air curtain unit shall be placed in the testing area in compliance with the requirements of Figure 2 so that the inlet and outlet are unrestricted and the air curtain width is perpendicular to the floor. The air discharge nozzle or adjustable vanes in the air discharge nozzle shall be set so as to provide a 15 ± 1 air discharge angle as shown in Detail A or B of Figure 1 B. Units without an adjustable air disctiarge nozzle are not required to be angled and shall be mounted so that nothing interferes with the airstream for 3000 mm (120 in.).
6. Observations and Conduct of Tests
6.1 InItial conditions
The unit under test shall be energized and operated for not less than one minute to allow equilibrium conditions to become established before the first determination.
6.2 Data to be recorded
6.2.1 ACU Under test. The following information shall be recorded: Manufacturer, trade name, model number, impeller diameter, inlet and outlet areas, number of fans, number of motors and the motof nameplate data.
