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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Entering coil pressure measurement pipe straight ashre g. As a certified test point for air-to-refrigerant heat B4. Any of the following instruments may be used: Here and throughout this document the use of [ ] signifies items evaluated in I-P units. An oil separator located in the compressor discharge line with provision for returning oil to the crankcase, either manually or automatically.
Entering air enthalpy at coil: The air then leaves the mixing chamber through a restricted opening or openings and enters the receiving chamber. The blenders shall not cause the air entering the coil to be turbulent. Pressure measurement pipe material lowing: 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. Volatile refrigerant evaporating coils: To minimize possible temperature stratification, appro- located below the outlet.
This device and a minimum of 10 diameters downstream from may be accomplished by any desired means that will maintain any 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.
An air leakage test shall be performed prior to initial use and at least annually thereafter, with corrective action taken if necessary. A permanent grid of hot wire anemometers that meet the requirements of Section C1.
A separator shall be located upstream of the superheater or throttling valve to remove condensate from the steam supply line.
Define terms used in testing. ASHRAE will take the lead with respect to dissemination of environmental information of its primary interest and will seek out and disseminate information from other responsible organizations that is pertinent, as guides to updating Standards and Guidelines. Ends shall be threaded or have flanges.
The connecting tubing attached to the suction header connection shall be the same size as the coil suction header connection. Steam lines shall be insulated between the temperature may be determined by a liquid flowmeter measuring the measuring instruments and the heat exchange apparatus.
A manually controlled electronic expansion valve. Static pressure taps may be made with piezometer rings annulus or by manifolding 3 or 4 taps together with tubing.
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The temperatures shall be averaged to determine ashras average air dry-bulb temperature surrounding intake and 7. Single-phase liquid absolute pressure entering the coil B6. The method determines the refrigerant mass flow rate by measuring its change in enthalpy and the heat removed from it on passing through the condenser.
The Society and its members focus on building systems, energy efficiency, indoor air quality, refrigeration, and sustainability. The pressure drop in the test measurement apparatus, including any pipe between the coil and ashra measuring devices, at the test flow shall be calculated and subtracted from the measurement.
When more heated refrigerant vapor shall be measured as it enters the than one nozzle is in use, the velocity pressure shall be deter- condenser, and the temperature tc2 and pressure Pc2 33-200 the mined for each nozzle. The liquid line and temperatures experienced under operation of the coil on subcooling entering the meter shall be not less than 2.
A permanent grid of hot wire anemometers that meet the C3.
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. Describe and specify calculations to be made from test data. In such cases, the temperature measuring instruments shall be shielded from direct exposure in a suitable manner.
Refrigerant Compressors and Condensing Units That 2. The connecting pipes shall be the same size as the coil supply and return connections. 3-32000 the condenser water specific heat at constant pressure and temperature at 0.
Single-phase liquid temperature entering the coil pressure downstream of pressure taps, mm [in. 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.