Download Air Conditioning Principles and Systems An Energy Approach by Edward G. Pita P.E. PDF

By Edward G. Pita P.E.

utilizing at least arithmetic, this ebook explores the basic techniques of air-con and their program to systems—explaining all techniques in a transparent, functional demeanour, and concentrating on difficulties and examples commonly encountered at the activity. This e-book comprises the latest and industry-wide accredited info on load calculations, layout facts, apparatus info, and use of the net. particular bankruptcy themes conceal the scope and makes use of of air con; actual rules; heating lots; furnaces and boilers; hydronic piping structures and terminal devices; cooling load calculations; psychrometrics; fluid move in piping and ducts; piping, valves, ducts, and insulation; enthusiasts and air distribution units; centrifugal pumps, growth tanks, and venting; air con platforms and kit; refrigeration structures and gear; computerized controls; strength usage and conservation; instrumentation, trying out, and balancing; and making plans and designing the HVAC procedure; and sunlight heating and cooling platforms. For consulting engineers, mechanical contractors, HVAC engineers, designers, undertaking managers, and amenities managers.

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4. Speckle-Interferometrie 50 Speckle-Effekt Der Speckle-Effekt entsteht bei Beleuchtung einer optisch rauen OberfHiche mit Laserlicht (Abb. 25a) [Jones & Wykes, 1989J. Das koharente monochromatische Wellenfeld wird diffus reflektiert. Durch Uberlagerung der einzelnen Lichtwellen entsteht eine komplizierte raumliche Verteilung von Interferenzmaxima und -minima. Bildet man eine beliebige Ebene dieses raumlichen Interferenzfeldes mittels direkter Belichtung einer Fotoplatte ab, so erhalt man ein so genanntes objektives Speckle-Muster (Abb.

Bei ungiinstigen Verschiebungsvorgaben treten an diesen Stellen insbesondere bei Faserneigungen cp -::J. 0 zum Teil betrachtliche Spannungs- bzw. Verzerrungskonzentrationen auf. Zur Reduktion kleinerer, auch im Regelfall auftretender SpannungserhOhungen wurden diese Eckbereiche in Abanderung einer friiheren Probekorperform mit einer gegeniiber dem Messfeld verstarkten Probendicke von 20 mm ausgefiihrt. Die Ausbildung einer unerwiinschten, den Messbereich umschlief&enden Rahmenwirkung wird durch die Anordnung der seitlichen Schlitze verhindert.

F"': ://;; ..... ,". ~'i'; yo-J . r :,. ~ "ft? I. I . 29: Messfeld (140 x 140 mm) eines Holzprobekarpers: (a) SpeckleInterferogramm, (b) Interferenzstreifen, (c) moduliertes Phasenbild Phasenschiebeverfahren: Eine geeignete Vorgangsweise zur Beseitigung der Mehrdeutigkeit bei der Bestimmung der Interferenzphase sowie zur Verminderung des Einflusses von Starungen wahrend der Messung ist wiederholtes Messen mit gezielt geanderten Parametern.

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