A Method of Computing Ship Contrast Temperatures Including Results Based on Weather Ship J Environment Data
1979
Wilson, Donald M.
This report describes a new method of calculating ship contrast temperatures and presents calculations using this method with weather ship data. The new method, named the Single Element Method, treats the ship as a single vertical element and applies 3 correction factors in defining an average ship temperature. These account for the different internal temperature and construction of various sections of the ship and also for the presence of hot exhaust stacks. A computer program based on the Single Element Method is described and ship contrast temperature calculations are given. This program models a specific ship, the U.S. Navy Patrol Frigate. However, the choice of ship model is shown to be not critical provided that stack cooling is assumed. The program was run with weather data gathered by Weather Ship J over an 8 year period (1964-71). Results are given as the probability of observing effect of target ship heading and season on contrast temperatures is analyzed and discussed. A general recommendation of expected contrast temperatures is made for the weather data of this study.
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