ANSI/ARI 530:2005 pdf download.RATING OF SOUND ANDVIBRATION FOR REFRIGERANT COMPRESSORS.
In the event that flexible lines are not commercially available, rigid tubing may be used, in a setup that provides flexibility for either the suction and/or discharge lines. A complete detailed sketch of the tubing geometry used shall be provided with the Report Form 3. Appendix F.
All refrigerant lines not part of the compressor assembly shall be installed and treated to minimize their acoustic contribution.
4.1.3 Electrical Power Supph’. Test voltage and frequency shall be as specified on the compressor nameplate.
Where dual voltages (i.e.. 230/460 V) are shown, either voltage may be used. Where extended voltage is specified
(i.e.. 208/230 V), the higher voltage shall be used. When dual frequency is indicated, tests shall be conducted at both
frequencies.
Test voltage shall be * 2 % of that specified and the frequency shall be held to ± 0.5 Hz tolerance.
4.1.4 Test Conditions. The compressor shall be tested after thermal and operating stabilization has been reached. The type of oil and refrigerant used for each test shall be identified. Standard Rating Conditions are defined in 5.5.
4.1.5 Narrow Band Measurements. When using digital Fourier analyzers to measure discrete spectrum component amplitudes, a Flat Top Window shall be used. Record the amplitude at each peak. The bandwidth shall be no more than 1/5 of the Fundamental Frequency.
4.2 Sound Level Measurements.
4.2.1 Sound Test Requirements. Sound tests shall be conducted in a free field in accordance with ANSI Standard SI 2.35 or in a reverberation room meeting the requirements of ANSI Standard S 12.51 [ISO 37411. For reverberation rxm measurements, the Comparison Method shall he used to compute the Sound Power Levels using a Reference Sound Source (RSS) that is calibrated in accordance with RI Standard 250. Qualification to the 63 Hz Octave Band shall be in accordance with ARI Standard 280. The tests shall be conducted at operating conditions specified in 4.1.3, 4.1.4, and 5.5.
4.2.1.1 Sound Power Levels shall be determined in decibels with respect to I pW for the One-third Octave Bands listed in Table I. Throughout this frequency range, the laboratory facility shall have been qualified for pure tone response in accordance with ANSI Standards SL2.51 [ISO 3741] or ANSI Sl2.35. In the case of free field type testing, the measurement space shall be qualified in accordance with ANSI S 12.35.
4.3 Vibration Measurements.
4.3.1 Operating conditions. The tests shall be conducted at the operating conditions described in 4.1.3, 4.1.4 and 5.5.
4.3.2 Measurement Points. Vibration measurements shall be taken at all mounting locations (1, 2. 3, 4), as close to the mounting point as possible. In addition, measurements shall also be taken on the compressor shell or body close to the location of the suction and the discharge fittings (Figure 2).
4.3.3 Measurement Directions. Vibration measurements shall be taken in three orthogonal directions at the suction and discharge fitting locations and in three orthogonal directions at the mounting locations (Figure 2).
At the suction and discharge fitting location, one direction shall be parallel to the centerline of the tubing at the fining.
One of the remaining two directions should describe the tangential motion of the compressor body at the fitting, if applicable, and shall be described in a skech. The third direction is then defined by the orthogonality requirement (Figure 2).
5.1 Determination of Sound Power Levels. Compressor Sound Power Levels for each One-Third Octave Band shown in Table I shall be determined in accordance with 4.2.1 I. The Sound Power Level test data shall be expressed in dB re. I pW for each One-Third Octave Band to the nearest 0.l dB.
5.2 (au version to A-Weighting Sound Power Levels. The compressor Sound Power Levels shall be convened to A-Weighted Sound Power Level by applying adjustments from Table 2 and calculated using the method described in 6.1.2 and Appendix E.
5.3 Vibration Data. Narrow band vibration data shall be obtained from a spectrum analysis of the vibration signal. These data shall be presented as rms displacement in mm [mils] for comparison purposes. Data shall be obtained in the frequency range of 5 to 500 Hz.
5.4 Gas Pulsation Data. Narrow-band pressure pulsation data shall be obtained from a spectrum analysis of the pulsation signal. If two transducers, ‘/4 wavelength apart are used, the highest value from either transducer at each frequency peak shall be used. These data shall be presented as kPa [psij rms. for comparison purposes. Data shall be obtained in the frequency range of 5 to 2000 Hi.
