The book covers the topics of compressors refrigeration system marine plants marine AC and designofheat exchangers.This book covers the course requirement for B.E marine (Anna university) V semester the entire courserequirement for GME (Graduate marine engineer) DME (Diploma marine engineer) and B.E marine (Approved byDGS Director general of shipping) students. Further it covers all the fundamental and general requirements forthe CLASS IV CLASS II AND CLASS I Certificate of competency exams held by DGS. It also explains the applicationsof refrigeration and air conditioning specific to Marine.This book will also be useful as a reference book for B.E Mechanical engineering students studying in Annauniversity colleges and DME (Diploma in marine engineering) course conducted by Directorate of technicaleducation Tamilnadu.All the students who are pursuing various marine engineering courses conducted by different Universitiesand Marine engineering colleges will be greatly benefitted by this book.