Author: Yongchan KimPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 420
Book Description
Two-phase Flow of HCFC-22 and HFC-134a Through Short Tube Orifices
Quasi-one-dimensional Numerical Analysis of Choked Two-phase Flashing Flow Through Millitubes
Author: Puya JavidmandPublisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 143
Book Description
Small-diameter tubes are utilized widely as expansion devices in refrigeration systems. Performance of these tubes is reliant upon critical flashing of the two-phase flow that controls the mass flow rate of the refrigeration system, resulting in a steep reduction in pressure and temperature. Due to the evaporating two-phase flow and the choked-flow condition, numerical analysis of flow through short-tube orifices is challenging. Accordingly, all available numerical analyses are performed as one-dimensional flows. The most comprehensive method for analyzing such flows is the two-fluid model, which does not assume equilibrium between phases. However, in all previous applications of this model, two-phase flow calculations at the entrance and vena contracta regions were eliminated. In the current investigation, two additional steps were used to improve the accuracy of computations: (1) applying the most comprehensive two-fluid model, including the effect of various two-phase flow patterns and the metastability of liquid phase; and (2) performing a two-phase analysis of the evaporating flow through the entrance and vena contracta. The second step involves simulation of this region as a contraction from the up-stream diameter to the throat, and an expansion from the throat diameter to the tube diameter. Results showed more compatibility with experimental data in comparison with those of previous investigations for predicting the critical flow condition of common refrigerants hydrofluorocarbon (HFC)-134a, hydrochlorofluorocarbon (HCFC)-22, and HFC-410a through short-tube orifices. Finally, the developed numerical simulation was applied in order to develop selection charts for short-tube orifices based on the common refrigerant HFC-134a and the alternative newly released refrigerants hydrofluoroolefin (HFO)-1234yf and HFO-1234ze. These charts help industry select new sizes for the expansion tools of their systems in order to run the system with its previous mass flow rates.
Mechanical Engineers' Handbook, Volume 4
Author: Myer KutzPublisher: John Wiley & Sons
ISBN: 1118956370
Category : Science
Languages : en
Pages : 1198
Book Description
The engineer's ready reference for mechanical power and heat Mechanical Engineer's Handbook provides the most comprehensive coverage of the entire discipline, with a focus on explanation and analysis. Packaged as a modular approach, these books are designed to be used either individually or as a set, providing engineers with a thorough, detailed, ready reference on topics that may fall outside their scope of expertise. Each book provides discussion and examples as opposed to straight data and calculations, giving readers the immediate background they need while pointing them toward more in-depth information as necessary. Volume 4: Energy and Power covers the essentials of fluids, thermodynamics, entropy, and heat, with chapters dedicated to individual applications such as air heating, cryogenic engineering, indoor environmental control, and more. Readers will find detailed guidance toward fuel sources and their technologies, as well as a general overview of the mechanics of combustion. No single engineer can be a specialist in all areas that they are called on to work in the diverse industries and job functions they occupy. This book gives them a resource for finding the information they need, with a focus on topics related to the productions, transmission, and use of mechanical power and heat. Understand the nature of energy and its proper measurement and analysis Learn how the mechanics of energy apply to furnaces, refrigeration, thermal systems, and more Examine the and pros and cons of petroleum, coal, biofuel, solar, wind, and geothermal power Review the mechanical parts that generate, transmit, and store different types of power, and the applicable guidelines Engineers must frequently refer to data tables, standards, and other list-type references, but this book is different; instead of just providing the answer, it explains why the answer is what it is. Engineers will appreciate this approach, and come to find Volume 4: Energy and Power an invaluable reference.
Heat Pump and Refrigeration Systems
Author: Thermal Engineering for Global Environmental Protection
Author: Subrata SenguptaPublisher: Begell House Publishers
ISBN:
Category : Science
Languages : en
Pages : 356
Book Description
This is the fourth in a series of seminars on current topics in heat transfer presented to develop cooperation between the United States and Japanese heat transfer communities.
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 738
Book Description
Mechanical Engineers' Handbook, Four Volume Set
Author: Myer KutzPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 1128
Book Description
Mechanical Engineers' Handbook, Third Edition, Four Volume Set provides a single source for all critical information needed by mechanical engineers in the diverse industries and job functions they find themselves. No single engineer can be a specialist in all areas that they are called on to work and the handbook provides a quick guide to specialized areas so that the engineer can know the basics and where to go for further reading.
EPA Publications Bibliography
Author: United States. Environmental Protection AgencyPublisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 150
Book Description
American Doctoral Dissertations
Author: Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 796
Book Description
Author: