Evaluation of Noise Level of Refrigeration Equipment
ARMY NATICK LABS MA
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The report covers an evaluation of the gasoline-engine-driven 3000 Btuhr capacity, 5000 Btuhr capacity refrigeration units to establish noise levels during operation for the conditions as manufactured, after addition of a muffler, and after application of acoustical material. The objectives of the evaluation were to determine the noise level at the operators position for each of the units as manufactured, after addition of a muffler, and after application of two types of acoustical material to determine the distances in front of, to the left, and to the right of each unit to the 90-decibel noise level to determine the back pressure in the exhaust manifold of each unit after assembly of the various mufflers and determine the levels of the octave band for the 150-300, 300-600, 600-1200, 1200-2400, 2400-4800, and 4800-10,000 cycles per second bands at the operators position for each of the refrigeration units in the various configurations are discussed.
- Air Conditioning, Heating, Lighting and Ventilating
- Human Factors Engineering and Man Machine Systems