Operations Manual, Section 4, STEP , Applicants shall submit the following documentation to. AHRI: •. Coil physical data per ASHRAE 33 (refer to Section );. ASHRAE Methods Of Testing Forced Circulation Air Cooling And Air Heating Coils. Be notified when this Standard is updated or amended – Add to. ANSI/ASHRAE Standard (Supersedes ANSI/ASHRAE Standard ) Methods of Testing Forced-Circulation Air-Cooling and Air-Heating Coils.
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The air finally leaves the discharge chamber.
ASHRAE – Free Download PDF
This method of test is used in conjunction with the 3. This piping loss shall be determined by calibration of the test apparatus or by calculation of pressure drop based on type of material used for the pipe using Normative Annex B. Entering coil pressure measurement pipe straight length downstream of pressure taps, mm [in. Individual static pressure readings shall be taken at each side coil capacity.
Hot wire anemometer d. If the throat diameter is mm [5 in.
A heat exchanger, with or without extended surfaces, through which either hot water, hot aqueous glycol solution, or steam is circulated for the purpose of sensible heating of a forced-circulation airstream. The dry-bulb ratory may choose to test only one coil for the verifica- entering air temperatures shall be measured in a grid with tion.
Pressure measurement pipe material e. Asnrae temperatures shall be averaged to determine the average air dry-bulb temperature surrounding intake and 7.
To determine asrhae air-water vapor mixture density entering the nozzle, the air static pressure entering the nozzle pN1 shall be taken using a pressure measuring instrument open to the atmosphere with the pressure taps located either in the throat of the nozzle or downstream from the nozzle plate, together with the air dry-bulb temperature entering the nozzle tN1db.
Water and aqueous glycol solution: Sight glasses located immediately before and after the meter to observe that vapor bubbles are not mixed with the liquid refrigerant. The upstream and downstream distances from the pressure tap shall be no less than mm [6 in.
Calibration tests shall be conducted under a. Flexible hose is asrhae between the unit connections and the pressure taps. Those recorded during the period of the test. Liquid mass flowmeter If using a liquid volume flowmeter, ensure that the temperature of the liquid is measured to within 0. This is to minimize the possibilities of temperature difference reading errors.
Leaving air enthalpy at coil: A condensate control valve shall be provided ments can serve as mixers provided that the water velocity at to regulate the condensate level. Standard 33 includes access to fluid type test data forms, which can be found online at http: Log In Sign Up.
These are ments outlined in Table B1. When sampling tubes are used, it is not neces- sealed against air leakage at any static pressure within the test sary to restrict the mixing chamber cross-sectional ahrae. Steam distributing tube type 4. The piezometer rings shall be located and constructed in accordance with the dimensions shown in Figure 7.
To shall not be less than 2. The two calibrations shall not differ by more than 2.
The top of the insulated condensate leg shall be vented continuously during test. If measuring liquid refrigerant flow, ensure that sufficient subcooling is present in the refrigerant entering and exiting the flowmeter such that flashing of refrigerant does not occur in the meter. Define terms used in testing. Record the original measured value, the calcu- static pressure measurements with acceptable systematic lated adjustment value, and the final calculated result for errors due to instrument installation location.
Equilibrium, for the purpose of this a.
A liquid control device capable of 8. Liquid-vapor mixtures used 3.