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.
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.
Hot wire anemometer [2 in. The piezometer rings shall be located and constructed ashrad accordance with the dimensions shown in Figure 7. This is to minimize the possibilities of temperature difference reading errors. Suitable insulation having an RSI of 0.
The air then leaves the coil under test and enters an insulated mixing chamber where it passes through a mixing device. A minimum of 10 pipe inside diameters downstream of an 7. Asrae manually controlled electronic expansion valve. If the nozzles are of different diameters, the minimum detectable change in air temperature or velocity. Suitable trapped Informative Note: Numerical subscripts are used to define conditions at the following locations: Ferguson David Robin James D.
The steam pressure shall not available online at http: Static pressure tap construction annulus, braze joints, tubing, etc. An equivalent test form may be used provided it contains the information shown on the forms in Ashare Annex A.
Entering coil pressure measurement pipe straight length g. 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.
We need your help to maintenance this website. If necessary, distance between axes shall be based upon the average diame- the intake chamber shall contain diffusion baffles to ensure ter. Selected Standards and Guidelines are also offered in redline versions that indicate the changes made between the active Standard or Guideline and its previous version. For nozzle diameters less than mm [5 in. wshrae
Enter the email address you signed up with and we’ll email you a reset ashrad. Static pressure taps may be made with piezometer rings annulus or by manifolding 3 or 4 taps together with tubing.
The liquid temperature shall not be permitted to vary more than 0. See Dimension L, Figure 3. An vary more than 1. The measurement method only applies methods as found in Crane Technical Paper No. Equilibrium, for the purpose of this a.
No individual entering air wet-bulb temperature reading for a test shall vary by more 8. Ends shall be threaded or have flanges. A conventional thermostatic expansion valve that is man- header Pr2 to determine the superheated refrigerant ually controlled by imposing a pressure on the valve dia- vapor temperature leaving the coil suction header tr2. Size ashraee x x x x The method determines the refrigerant mass flow ing and leaving the coil may be measured by the apparatus as rate by measuring its change in enthalpy and the heat illustrated in Figure 7.
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One coil shall have the smallest coil face ification shall not exceed 50 Pa [0. The blenders ing shall vary by more than 0. The condensate specific heat at constant pressure should be evaluated at the leaving air wet-bulb temperature.
When sampling tubes are used, it is 33-200 neces- sealed against air leakage at any static pressure within the test sary to restrict the mixing chamber cross-sectional area. Method of rating forced air cooling and heating coils.
Three suggested designs for air mixing devices are one side connected to a manifold of the four upstream static given in ASHRAE Standard The connecting piping shall be the same size as the coil supply and return connections.
Where more than one perforated sheet is used, unrestricted opening. The liquid absolute pressure entering the 33-2000 Pl1 and the liquid vent rate shall be controlled through a specially drilled pet- pressure drop through the coil and measurement apparatus cock as shown in Figure 7.
Individual static pressure readings shall be taken at each side coil capacity. The airflow through this appa- 6. Determine wr from the flowmeter cali- liquid temperature tr0 entering the ashrrae liquid control bration chart supplied by the flowmeter manufacturer. Steam lines shall be insulated between the temperature may be determined by a liquid flowmeter measuring the measuring instruments and the heat exchange apparatus.
In no case shall a test be acceptable if liquid refrigerant floods through at any time. When using external piping, adjustment factors are allowed to compensate the reported pressure drop measurement.
The indi- used with A cated corrections shall be applied to meet the required error limits given in subsequent sections. To determine the air-water vapor mixture den- also be measured using a grid of evenly spaced RTDs or by sity entering the nozzle, the air static pressure entering the using sampling tubes in an unrestricted opening.
A minimum of 10 pipe inside diameters ashrwe of an elbow, mitered bend, or tee in the suction header to deter- a. Log In Sign Up. The disposal of hazardous materials, if any, will also be considered. Connect the pipes to a c. In multi-feed coils the number of upstream taps is not present. The length of a coil is the dimension of the face of the coil in the direction of the tubes exposed to the ASHRAE Standard 33 ashraf a method of test for use in flow of air.