INSULTECH

Case Study 5.5
Trane Model 255 - 300 Rotary Screw Liquid Chiller

Design Specificiaton: LT450A-TT - 2" Thickness

Insultech Application
This case study was performed on a Trane Model 255-300 Rotary Screw Liquid Chiller. INSULTECH Acoustic Blanket Insulation was used to treat various components of the machine, determined to be major sound sources. These machine components included: the motor housing, compressor housing and the compressor discharge piping and isolation valve to the condenser.

Sound Pressure Level Readings
Taken before and after INSULTECH Acoustic installation, the machine was running at 60% load at each reading. An ambient reading taken to determine the influence of outside sources concluded that an HVAC axial fan contributed to the high ambient sound reading. All remaining equipment had little or no influence.

Machine Position
Sound readings were taken 2 LF from the machine surface plane and 3 LF from the concrete floor. The machine was positioned in the corner of the room with another Trane Chiller position adjacent to the one metered. All readings were taken along the same 2 LF surface plane around the machine in the A weighting measurement.

Source readings were as follows:

Location Description

Position 1

Position 2

Position 3

Position 4

Position 5

Position 6

Position 7

Position 8

Position 9

Position 10

Overall DBA Level:

Ambient Reading (Center of Mech. Room)