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.
|Published (Last):||4 November 2016|
|PDF File Size:||13.92 Mb|
|ePub File Size:||16.86 Mb|
|Price:||Free* [*Free Regsitration Required]|
At the dead end of the coil suction header to determine the superheated refrigerant vapor absolute pressure leaving the coil circuits Prc2.
This is to minimize the possibilities of temperature difference reading errors. Through its Handbook, appropriate chapters will contain up-to-date Standards and design considerations as the material is systematically revised.
If equivalent Figure 6. The two calibrations shall not differ shall be provided: We are a non-profit group that run this website to share documents. A test is the recorded group of readings of test variables taken while equilibrium is maintained and used in the computation of results. Those recorded during the period of the test. However, energy source selection and the possible environmental impact due to the energy source and energy transportation will be considered where possible.
Center-to-center distances between nozzles in use shall not be less than three throat diameters, and the distance from the center of any nozzle to any of the four adjacent side walls shall not be less than 1. The air dry-bulb temperature measuring instrument shall then readily interchanged between inlet and outlet positions be mounted upstream or to one side of the air wet-bulb tem- for every test recorded reading. This may be done by removing the remote The refrigerant lines shall be insulated at and adjacent to thermal bulb and applying air or other noncondensible gas the temperature measuring instruments.
An equivalent TD form applicable to the tested fluid type available online test form may be used provided it contains the information at http: In dehumidifying coil tests, the manifold con- to not more than 2.
A test run is the complete group of readings of test variables, which includes the following: Single-phase liquid absolute pressure entering the coil upstream of pressure taps, mm [in.
The piping loss shall be determined by calibration of the measurement apparatus. The intake chamber need not be insulated 7. Gener- to pipe of circular cross section.
This device and a minimum of 10 diameters downstream from may be accomplished by any desired means that will maintain wshrae tube fitting to determine the subcooled refrigerant liq- steady-state conditions, such as a hand-operated throttling uid absolute pressure entering the liquid control device valve in the suction line or a hand-operated bypass valve Pr0.
Those observed or recorded during a sufficient period to indicate that equilibrium was attained prior to the actual test.
A Darcy friction B3. Numerous studies conclude that the determination of a calculated correction term for these external components may contain significant sources of error; therefore, the use of external correction factors is restricted to limit the magnitude of these potential errors. The temperature tC2 and pressure PC2 of the superheated refrigerant vapor shall be measured as it leaves the compressor. The pressure drop in the test measurement apparatus, including any pipe between the coil and the measuring devices, at the test flow shall be calculated and subtracted from the measurement.
The mean of these readings shall be used for the test calculations. Static pressure tap construction annulus, braze joints, tubing, etc. The two temperature measuring instruments shall be close together in the airstream so as to measure the same sample of air.
ASHRAE – Free Download PDF
The device shall consist of a tank having sufficient capacity to accumulate the flow for 333-2000 least two minutes and shall be located so that the liquid leaving the coil under test can be diverted into it.
An equivalent test form may be lubricant mixture, shall be 0. Those observed or recorded during a sufficient period to 1. Sight glasses located immediately before and after the meter to observe that vapor bubbles are not mixed with the liquid refrigerant.
This method of test is used in conjunction with the 3.
A liquid control device capable of meeting the requirements of Section 9. Steam lines shall be insulated between the temperature may be determined by 33–2000 liquid flowmeter measuring the measuring instruments and the heat exchange apparatus. See Dimension L, Figure 3. Adjacent to the pressure tap downstream of the suction header Pr2 to determine the superheated refrigerant vapor temperature leaving the coil suction header tr2.
Pressure measurement asnrae material e. Single-phase liquid absolute pressure entering the coil pressure measurement pipe, kPa [psi] i. Any of the following instruments may be used: Every effort is made to balance the concerned interests on all Project Committees. Instruments shall be recalibrated on a regular schedule that is appropriate for each instrument, and calibration records shall be maintained.
Pressure measurement pipe material lowing: Aehrae signifies the concurrence of more than a simple majority, but not necessarily unanimity. If any modifications [2 in. Size px x x x x We need your help to ashra this website. The connecting tubing attached to the suction sion of the condenser water method for volatile refrigerant header connection shall be the same size as the coil suction flow measurement. Center-to-center distances between sured in a restricted opening or openings, so that the velocity nozzles in use shall not be less than three throat diameters, of the air passing over the temperature measuring instruments and the distance from the center of any nozzle to ashrse of the will be approximately 5.
We need your help! Leaving coil pressure measurement pipe straight length single-phase liquid flow source. After proceeding through another set of diffusion baffles, when required, the air enters the airflow measuring nozzles and discharges into the discharge chamber.