T&R Bulletin 4-16 (2023) supersedes the existing T&R Bulletin 4-16 (1980) and T&R Bulletin 4-16 (2015).
This SNAME T&R Bulletin 4-16 (2023) revised the case numbers and equations numbers to enumerate the section in which they have been provided.
Section 3.6, HVAC Conversion Factor, has been modified to direct calculation of the HVAC Conversion Factor at the midway point between the outside air design temperature and the preheat temperature. A dedicated Section 6.0, Machinery Spaces Ventilation and Air Conditioning has been added to the bulletin. Section 6.0 includes criteria for ventilated and air conditioned machinery spaces, sheds a light on the importance of the air expansion factor, provides detailed calculations for determining the ventilation supply and exhaust airflows, and provides guidance for underway and in-port heating analyses. Section 6.0 also includes a discussion on combustion air, both ducted directly from the weather and taken from the space.
A dedicated Section 7.0 has been added to discuss the use of Variable Frequency Drives (VFDs) in marine HVAC applications.
The bulletin has been revised to include internal hyperlinks for section names and equations. Additionally, all text within the document is now searchable.