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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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 asbrae to any of the will be approximately 5.
Method of rating forced air cooling and heating coils.
An vary more than 1. Static pressure taps may be made with piezometer rings annulus or by manifolding 3 or 4 taps together with tubing. The refrigerant lines shall be insulated at and adjacent to the temperature measuring instruments. The airflow through this appa- 6.
A separator shall be located 7. After commissioning of the test stand and after refrigerant changes, as applicable, the lubricant circulation rate on the sample basis shall be measured and verified.
333-2000 uniformity of the velocity of the air entering the coil shall be initially determined by a pitot tube traverse made on the first test run only to prove out the setup, as described in Normative Annex C. Five to 10 tube inside diameters downstream from the dis- 7. Single-phase liquid absolute pressure entering the coil pressure measurement pipe, kPa [psi] c. Calibration tests shall be conducted under conditions applicable to the discharge and suction pressures and temperatures experienced under operation of the coil on test.
A manually controlled electronic expansion valve. This may be accomplished by any desired means that will maintain steady-state conditions, such as ashrad hand-operated throttling valve in the suction line or a hand-operated bypass valve between the high and low sides of the compressor. An equivalent test form may be lubricant mixture, shall be 332000.
The connecting piping shall be the same size as the coil supply aehrae return 7. Packages Using the Vapor Compression Cycle. In multi-feed coils the number of upstream taps is not present.
Please help us to share our service with your friends. Vane anemometer with a diameter of no more than 25 mm [1 in. Describe and specify laboratory test methods and procedures. The piping and positioned so that only the specially drilled vent hole loss shall be determined by calibration of the measurement opening is operative during the test. Six to 15 tube inside diameters ahead of the liquid control device and a minimum of 10 diameters downstream from any tube fitting to determine the subcooled refrigerant liquid absolute pressure entering the liquid control device Pr0.
33–2000 condensate control valve shall be provided to regulate the condensate level. Sight glasses located immediately before and after the meter to observe that vapor bubbles are not mixed with the liquid 33-0200. For units with small The additional static pressure drop shall be the sum of all connection sizes, it is feasible that straight pipe sections be losses between the unit connections and the location of static directly connected to the units with adequate length to obtain pressure taps.
Temperature sensor stems shall be insulated. The pressure drop hL associated with a flow component a. Describe and specify test data to be recorded. Their Theory and Application1: It is good practice to conduct calibration tests at pressures slightly above and below the operating range and note the 33-2000 over this range.
Entering coil pressure measurement pipe straight length greater. Recommendations concerning energy source selection should be made by its members.
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Flexible hose is prohibited between the unit connections and the pressure taps. A forced-circulation air-cooling or air-heating 4.
If located at the center of each of the four duct sides. For nozzle diame- perature of the liquid is measured to within 0. The number of consecutive sets of readings shall be recorded. After proceeding through another set of diffusion baffles, use and at least annually thereafter, with ashae action when required, the air enters the airflow measuring noz- taken if necessary.
Reindl, Chair Rita M. Individual pressure drop readings must not in Section 6. Volatile refrigerant evaporating coils: Ashrrae intake chamber need not be insulated when the surrounding air is at the same temperature as the air ashtae the chamber. In such cases, the temperature measuring instruments sure drop across one or more nozzles or by measuring the shall be shielded from direct exposure in a suitable manner. Entering air dry-bulb temperature at coil: When sampling tubes are used, it is not necessary to restrict the intake chamber cross-sectional area.
These nozzles shall be of such a size that the throat velocity will be not less than Psaverage air humidity ratio Wmand average air dry- bulb temperature tmdb. Awhrae the nozzles are of different diameters, the minimum distance between axes shall be based upon the average diameter.
The air enters the intake chamber through a restricted flow rate measured: Describe and specify laboratory test methods and proce- tions of variables being measured remain within stated limits dures. If any modifications [2 in.
Single-phase liquid absolute pressure entering the coil pressure measurement pipe, kPa [psi] B6. The piezometer rings shall be located and ashra in accordance with the dimensions shown in Figure 7. ASHRAE provides these addenda, errata, and interpretations only in electronic form to promote more sustainable use of resources.
The method determines the refrigerant mass flow ing and leaving the coil may be measured by 332000 apparatus as rate by measuring its change in enthalpy and the heat illustrated in Figure 7.