Why do we specify LTTR value for some insulating materials?
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For insulating materials that contain HCFC gas, we specify LTTR value because a small percentage of HCFC gas migrates out of the material after manufacture, reducing its R-value gradually until it stabilizes at about six months. The stabilized R-value is called long-term thermal resistance (LTTR).
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An oil slinger is used with reciprocating compressors that are lubricated by:
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