The paper deals with the block-oriented approach in modelling of a solar domestic hot water system. Due to the linking possibility to other technological processes (greenhouse, dryer, etc.) the Matlab+Simulink software was decided to use. The entire model consists of the sub-system models as collector, heat exchanger and storage tank. The governing heat and mass transfer equations are given alo...

This paper is concerned with the observability problem of a parallelow twouid heat exchanger equation with di usion term. First, the case where two uid temperatures are measured at the outlet is considered. It is shown that the observed system with the measurements becomes observable on any interval of time through a concrete series expression of the solution. Next, the two cases where each one...

Systematic control structure design requires the use of a model of the plant. Developing rigorous plant models based on physical and chemical principles is often a laborious and time consuming task. This paper studies the effect of simplifications of the heat exchanger model on the resulting control structure design for the PRICO LNG process. It is found that significant model simplifications m...

Title of Document: ONLINE APPROXIMATION ASSISTED MULTIOBJECTIVE OPTIMIZATION WITH HEAT EXCHANGER DESIGN APPLICATIONS Khaled Hassan Mohamed Saleh, Doctor of Philosophy, 2012 Directed By: Shapour Azarm, Professor, Department of Mechanical Engineering Computer simulations can be intensive as is the case in Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA). The computational cost...

The paper investigates the heat transfer characteristics of exchanger under two different configurations namely taper helical tube and spiral type exchanger. working fluid is water which flows in tubes kept horizontally mass flow rate ranges from 0.04 kg/s to 0.16 kg/s. effect configuration parameters Reynolds number on coefficient Nusselt were studied. Regression equations have been developed ...