Butter melting process is considered a process of heating which consumes a huge amount of thermal power. User can assign some of the specific required data to calculate a design model for solar area, mass flow rates, and pumping power. Moreover; cost and environmental correlations were embedded. The tank model calculates the Qloss by considering the air gap, and braik resistances. Moreover; user has the ability to calculate the basic model for SAFOLA (no system enhancments) or calculate the system based on the new specifications. PTC trough collector is used with the use of water steam flow rate. The water steam is dry saturated vapor. **MatLab-SimuLink 64bit should be used to run the model. email us for the password (msherafeldin@gmail.com) Copyright © 2007 by Mohamed A. Sharaf Eldean Ayoub All rights reserved. No part of this work may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher (Mohamed A. Sharaf Eldean Ayoub). For permission requests, write to the publisher, addressed “Attention: Permissions Coordinator,” at the address below. Suez University, Suez EgyptFaculty of Petroleum & Mining Engineering Egineering Science Dept mohammed.eldeen@suezuniv.edu.eg, mwahab31@yahoo.com 00601139795943 All Rights Reserved ___________________