Ejectors for Efficient Refrigeration

Ejectors for Efficient Refrigeration

Encompassing both practical applications and recent research developments, this book takes the reader from fundamental physics, through cutting-edge new designs of ejectors for refrigeration.

Author: Giuseppe Grazzini

Publisher: Springer

ISBN: 9783319752440

Category: Technology & Engineering

Page: 180

View: 318

Encompassing both practical applications and recent research developments, this book takes the reader from fundamental physics, through cutting-edge new designs of ejectors for refrigeration. The authors’ unique vision marries successful design, system optimization, and operation experience with insights on the application of cutting-edge Computational Fluid Dynamics (CFD) models. This robust treatment leads the way forward in developing improved ejector technologies. The book covers ejectors used for heat powered refrigeration and for expansion work recovery in compression refrigerators, with special emphasis on two-phase flows of “natural” fluids within the ejector, i.e. steam and carbon dioxide. It features worked examples, detailed research results, and analysis tools.
Categories: Technology & Engineering

Water R718 Turbo Compressor and Ejector Refrigeration Heat Pump Technology

Water  R718  Turbo Compressor and Ejector Refrigeration   Heat Pump Technology

The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design ...

Author: Milan N. Sarevski

Publisher: Butterworth-Heinemann

ISBN: 0081007337

Category: Compressors

Page: 304

View: 328

Water (R718) Turbo Compressor and Ejector Refrigeration/Heat Pump Technology provides the latest information on efficiency improvements, a main topic in recent investigations of thermal energy machines, plants, and systems that include turbo compressors, ejectors, and refrigeration/heat pump systems. This, when coupled with environmental concerns, has led to the application of eco-friendly refrigerants and to a renewed interest in natural refrigerants. Within this context, readers will find valuable information that explores refrigeration and heat pump systems using natural refrigerants, polygeneration systems, the energy efficiency of thermal systems, the utilization of low temperature waste heat, and cleaner production. The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design and construction of thermal plants and systems, and those who wish to specialize in the use of R718 as a refrigerant in these systems. Describes existing novel R718 turbo compressor and ejector refrigeration/heat pump systems and technologies Provides procedures calculating and optimizing cycles, system components, and system structures Estimates the performance characteristics of the thermal systems Exposes the possibilities for wider applications of R718 systems in the field of refrigeration and heat pumps
Categories: Compressors

A High Efficiency Ejector Refrigeration System

A High Efficiency Ejector Refrigeration System

In a time when efforts to reduce high-grade energy consumption are a necessity, it is useful to develop innovative alternatives to technologies that involve large amounts of power consumption, such as vapor compression refrigeration.

Author: Daniel Allen Pounds

Publisher:

ISBN: OCLC:900614525

Category: Electronic dissertations

Page: 68

View: 689

In a time when efforts to reduce high-grade energy consumption are a necessity, it is useful to develop innovative alternatives to technologies that involve large amounts of power consumption, such as vapor compression refrigeration. The ejector refrigeration system is such an alternative. What makes the ejector so attractive is that the system is heat operated, making the system ideal to be powered from low-grade thermal energy such as solar generated hot water or waste heat, especially when electricity supply is limited or non-existent. A mathematical model has been developed, which considers both the isentropic efficiencies to account for viscous effects, and the potential for a multi-fluid system. At the same time, an experimental investigation of an ejector refrigeration system was conducted to determine the effects of nozzle size, nozzle location, high temperature evaporator temperature, and refrigeration temperature. It was found that an optimum nozzle location which can produce a maximum coefficient of performance (COP) exists. The mathematical model has been verified with good agreement to experimental data. Current investigation demonstrates that the ejector refrigeration system is a very promising alternative to the status quo vapor compression systems.
Categories: Electronic dissertations

Water R718 Turbo Compressor and Ejector Refrigeration Heat Pump Technology

Water  R718  Turbo Compressor and Ejector Refrigeration   Heat Pump Technology

The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design ...

Author: Milan N. Šarevski

Publisher: Butterworth-Heinemann

ISBN: 9780081007341

Category: Science

Page: 304

View: 421

Water (R718) Turbo Compressor and Ejector Refrigeration/Heat Pump Technology provides the latest information on efficiency improvements, a main topic in recent investigations of thermal energy machines, plants, and systems that include turbo compressors, ejectors, and refrigeration/heat pump systems. This, when coupled with environmental concerns, has led to the application of eco-friendly refrigerants and to a renewed interest in natural refrigerants. Within this context, readers will find valuable information that explores refrigeration and heat pump systems using natural refrigerants, polygeneration systems, the energy efficiency of thermal systems, the utilization of low temperature waste heat, and cleaner production. The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design and construction of thermal plants and systems, and those who wish to specialize in the use of R718 as a refrigerant in these systems. Describes existing novel R718 turbo compressor and ejector refrigeration/heat pump systems and technologies Provides procedures calculating and optimizing cycles, system components, and system structures Estimates the performance characteristics of the thermal systems Exposes the possibilities for wider applications of R718 systems in the field of refrigeration and heat pumps
Categories: Science

Solar Cooling for Buildings

Solar Cooling for Buildings

A basic problem with an ejector double - loop system is that an ejector is not as
efficient as a compressor . Although substantial development funds have been
spent by various organizations in an attempt to improve ejector efficiency these ...

Author: Francis DeWinter

Publisher:

ISBN: UOM:39015000486392

Category: Air conditioning

Page: 231

View: 153

Categories: Air conditioning

Energy and Thermal Management Air Conditioning Waste Heat Recovery

Energy and Thermal Management  Air Conditioning  Waste Heat Recovery

In this paper is explained how the efficiency of refrigeration cycles and in
particular those with carbon dioxide (CO2, R744) as refrigerant can be
augmented by use of an ejector. Special emphasis is put on the exposure of CO2
as a safe and ...

Author: Christine Junior

Publisher: Springer

ISBN: 9783319471969

Category: Technology & Engineering

Page: 188

View: 594

The volumes includes selected and reviewed papers from the 1st ETA Conference on Energy and Thermal Management, Air Conditioning and Waste Heat Recovery in Berlin, December 1-2, 2016. Experts from university, public authorities and industry discuss the latest technological developments and applications for energy efficiency. Main focus is on automotive industry, rail and aerospace.
Categories: Technology & Engineering

Refrigeration Air Conditioning and Heat Pumps

Refrigeration  Air Conditioning and Heat Pumps

The performance of an ejector for expansion work recovery is commonly
described with the aid of 4 metrics, i.e., mass entrainment ratio (ω), suction
pressure ratio (D), pressure lift (Plift ) and expansion work recovery efficiency,
being generally ...

Author: Fabio Polonara

Publisher: MDPI

ISBN: 9783039438235

Category: Technology & Engineering

Page: 180

View: 372

Refrigeration, air conditioning, and heat pumps (RACHP) have an important impact on the final energy uses of many sectors of modern society, such as residential, commercial, industrial, transport, and automotive. Moreover, RACHP also have an important environmental impact due to the working fluids that deplete the stratospheric ozone layer, which are being phased out according to the Montreal Protocol (1989). Last, but not least, high global working potential (GWP), working fluids (directly), and energy consumption (indirectly) are responsible for a non-negligible quota of greenhouse gas (GHG) emissions in the atmosphere, thus impacting climate change.
Categories: Technology & Engineering

Sustainable Environment and Transportation

Sustainable Environment and Transportation

The relationship between the solar ejector refrigeration system refrigerating
capacity and solar radiant heat of collector is as follows[3]: Q e = Qsc × (ηsc ×
COP) (7) In the formula:η sc—collector efficiency; COP—performance coefficient
for ...

Author: Ming Jin Chu

Publisher: Trans Tech Publications Ltd

ISBN: 9783038138389

Category: Technology & Engineering

Page: 3116

View: 803

These selected papers offer an overview of current knowledge in the fields of Renewable Energy and Building Energy Saving; Indoor Environments; City Ecological Environments; Water Purification and Wastewater Treatment; Air Environment Control and Architectural Environment Improvement Techniques; Road and Railway Engineering; Transportation Planning, Construction and Operation Organization; Bridge Engineering; Traffic Control and Information Technology; Carrier Operation Engineering. The volumes provide a comprehensive picture of the situation world wide.
Categories: Technology & Engineering

Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies

Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies

The Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies gathers state-of-the-art research related to thermal performance and energy-efficiency.

Author: Gaspar, Pedro Dinis

Publisher: IGI Global

ISBN: 9781466683990

Category: Technology & Engineering

Page: 468

View: 822

In recent years, the sustainability and safety of perishable foods has become a major consumer concern, and refrigeration systems play an important role in the processing, distribution, and storage of such foods. To improve the efficiency of food preservation technologies, it is necessary to explore new technological and scientific advances both in materials and processes. The Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies gathers state-of-the-art research related to thermal performance and energy-efficiency. Covering a diverse array of subjects—from the challenges of surface-area frost-formation on evaporators to the carbon footprint of refrigerant chemicals—this publication provides a broad insight into the optimization of cold-supply chains and serves as an essential reference text for undergraduate students, practicing engineers, researchers, educators, and policymakers.
Categories: Technology & Engineering

ECOS 2002

ECOS 2002

( 1 ) net power input The COP provides a measurement of the energy use
efficiency for any refrigeration system , regardless of ... ha Strongpoint of Ejector
Refrigeration Ejector refrigeration has continued to draw considerable attention
due to its ...

Author: George Tsatsaronis

Publisher:

ISBN: UCSD:31822036332401

Category: Environmental impact analysis

Page: 34

View: 512

Categories: Environmental impact analysis

Proceedings of the 24th Intersociety Energy Conversion Engineering Conference Systems cycles and engines

Proceedings of the 24th Intersociety Energy Conversion Engineering Conference  Systems  cycles  and engines

Abstract The adaptation of conventional and improved ejector ( vapor
compressor ) refrigeration cycles for low grade or ... Introduction Mg PUMP 2 Tg.P
. Q9 GENERATOR EJECTOR Efficient utilization of the abundance of low grade
or waste ...

Author:

Publisher:

ISBN: PSU:000015686527

Category: Power (Mechanics)

Page: 3112

View: 897

Categories: Power (Mechanics)

Progress in Refrigeration Science and Technology

Progress in Refrigeration Science and Technology

Proceedings of the XIV International Congress of Refrigeration. lation ,
approximate methods were designed . Due to the methods the equation for
ejector efficiency is used : Uairil Aislen η : ( 7 ) ( dipen Pe where ( 4. islen and ( a
plen are the ...

Author:

Publisher:

ISBN: CORNELL:31924001707490

Category: Low temperatures

Page:

View: 888

Categories: Low temperatures

ASHRAE Handbook Product Directory

ASHRAE Handbook   Product Directory

Low efficiency is inherent with air cycle equipment , including vortex tube
refrigeration . ... Steam - jet ejectors using water as the refrigerant must operate
over a pressure ratio of 6 to 8 which tends to reduce ejector efficiency . Design ...

Author: American Society of Heating, Refrigerating and Air-Conditioning Engineers

Publisher:

ISBN: UOM:39015007656781

Category: Air conditioning

Page:

View: 886

Categories: Air conditioning

Proceedings of the International Congress of Refrigeration

Proceedings of the     International Congress of Refrigeration

considered as constants will give values for the ejector efficiency as those
represented by curve I , Fig . 1 . It has been claimed by practical investigators ,
however , that it is not possible to obtain the higher efficiencies at the lower
values of n ...

Author:

Publisher:

ISBN: UIUC:30112008254895

Category: Low temperature research

Page:

View: 595

Categories: Low temperature research

Industrial Refrigeration

Industrial Refrigeration

For greater temperature differences two ejectors in series are required , of which
the first discharges into the second , which must aspirate and compress the
mixture of steam and cold vapor of the first ejector , for which the efficiency is
greatly ...

Author:

Publisher:

ISBN: UIUC:30112008257203

Category: Cold storage

Page:

View: 395

Categories: Cold storage

The Journal of Refrigeration

The Journal of Refrigeration

High veloctiies have two major drawbacks ; the possibility of shocks is greater
and the entrainment efficiency is very poor . Another important requirement of an
ejector refrigerant is in regard to the boiler pressure which should not be very
high ...

Author:

Publisher:

ISBN: CORNELL:31924058334602

Category: Refrigeration and refrigerating machinery

Page:

View: 599

Categories: Refrigeration and refrigerating machinery

Bulletin

Bulletin

International Institute of Refrigeration. solid phases ... Liquid - liquid ejectors (
liquid ejector process and efficiency ; cavitation ) . ... Steam - jet refrigeration
systems ( design and operation of actual system ; design of the system
components ) .

Author: International Institute of Refrigeration

Publisher:

ISBN: UOM:39015022686276

Category: Refrigeration and refrigerating machinery

Page:

View: 600

Categories: Refrigeration and refrigerating machinery

Solar Engineering

Solar Engineering

The efficiency for a booster assisted ejector refrigeration system is determined by
its coefficient of performance COP , defined as Tco + 10°C STGE 90°C with ATGE
= 5°C in which the generator saturation temperature , TGE , defines the ...

Author: American Society of Mechanical Engineers. Solar Energy Division. Conference

Publisher:

ISBN: UOM:39015047932911

Category: Solar energy

Page:

View: 898

Categories: Solar energy

Journal of Refrigeration

Journal of Refrigeration

Technical Abstracts T 112 S PC 6 In the mixing chamber part of the kinetic energy
of the refrigerant from the condenser is used ... 3de3 PA The use of an ejector as
expansion means is also said to reduce the compression ratio and the intake
volume of ... The process is more efficient when the difference between conP8
Fig .

Author:

Publisher:

ISBN: PSU:000067427338

Category: Refrigeration and refrigerating machinery

Page:

View: 905

Categories: Refrigeration and refrigerating machinery

Encyclopedia of Energy Technology and the Environment

Encyclopedia of Energy Technology and the Environment

Steam use in this range varies roughly as ( 1 / P ) 0 . 3 , where P is absolute
suction pressure ( see Vacuum REFRIGERATION technology ) . Because of the
low efficiency of steam - ejector vacuum Refrigeration ( qv ) is a very high value
utility .

Author: Attilio Bisio

Publisher:

ISBN: UCSD:31822021329404

Category: Environmental protection

Page: 2964

View: 678

V.1. A-C -- v.2. C-F -- v.3. G-P -- v.4. R-Z Index
Categories: Environmental protection