الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The temperature is one of some important parameters, in ai~cpnditioning systiems,which is needed to contirol within suitable limits. Uaually,the response of the temperature co¬ntrol devices to the required condition is accompanied by su¬dden change in the flow of the working substance, i.e. to flow perturbation, through the main part which is known as the heat exchanger.
Therefore, in this thesis a complete de”Germination of the dynamic behaviour as well as the static behaviour of a two¬flow heat exchanger, for any operating condi”Gion, subjected to small flow perturbations at the inlet of any fluid or both was conside1.’ed. dealing with that subject,has obtained some linear partial The investigator, after recalling the previous research-I differential equations using suitable assumptions. These equ¬ations were solved analytically employing Laplace Transform and some other methods. Also they woru-oolved~numrlgally to check the results of the analytical method. br>Some Fortran Programmes were prepared to facilitate and accelerate the compu”cation.An experimental apparatus has been designed and const¬ructed in the laboratory to verify the theoretical study and