TAILIEUCHUNG - Ebook Introduction to thermal systems engineering - Thermodynamics, fluid mechanics, and heat transfer: Part 2

(BQ) Part 2 book "Introduction to thermal systems engineering - Thermodynamics, fluid mechanics, and heat transfer" has contents: Psychrometric applications, the momentum and mechanical energy equations, internal and external flow, heat transfer by conduction, heat transfer by radiation,. and other contents. | 10 PSYCHROMETRIC APPLICATIONS (CD-ROM) Introduction chapter objective psychrometrics The objective of this chapter is to study systems involving mixtures of dry air and water vapor. A liquid water phase also may be present. Knowledge of the behavior of such systems is essential for the analysis and design of air-conditioning devices, cooling towers, and industrial processes requiring close control of the vapor content in air. The study of systems involving dry air and water is known as psychrometrics. The complete material for Chapter 10 is available on the CD-ROM only. 250 14 10 PSYCHROMETRIC APPLICATIONS Introduction The objective of this chapter is to study systems involving mixtures of dry air and water vapor. A liquid water phase also may be present. Knowledge of the behavior of such systems is essential for the analysis and design of air-conditioning devices, cooling towers, and industrial processes requiring close control of the vapor content in air. The study of systems involving dry air and water is known as psychrometrics. chapter objective psychrometrics Introducing Psychrometric Principles The object of the present section is to introduce some important definitions and principles used in the study of systems involving dry air and water. Moist Air The term moist air refers to a mixture of dry air and water vapor in which the dry air is treated as if it were a pure component. As can be verified by reference to appropriate property data, the overall mixture and each mixture component behave as ideal gases at the states under present consideration. Shown in Fig. is a system consisting of moist air occupying a volume V at mixture pressure p and mixture temperature T. The overall mixture is assumed to obey the ideal gas equation of state. Thus pϭ m1R րM2T nRT ϭ V V () where n, m, and M denote the moles, mass, and molecular weight of the mixture, respectively, and n ϭ mրM (Eq. ) has been used to relate molar and mass

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