A Heat exchanger is an essential thermal machine
ingunitscondens | 29 Avgust, 2019 05:47
A Heat exchanger is an essential thermal machine employed for industrial
cooling, with several types existing: shell and tube, plate exchangers, spiral
heat exchanger, block and fin heat exchangers. Heat exchangers are crucial
equipments for industrial thermoregulation, but also required in residential and
commercial air-conditioning plants, achieving heat transfer between two fluids
with different temperatures: Water Cooled Evaporators heat exchangers are indeed passive thermal
machines, allowing the transfer of heat energy between fluids, thanks to an
existing temperature gap.
In a plate heat exchanger, the fluids are
separated by a thin metallic screen, a plate, wich allows the heat transfer
between the two fluids flowing on its sides separately. Corrugated plates
increase thermal transfer, extending exchanging surface area and boosting energy
dissipation thanks to turbulence prompted in flowing fluids and higher
transmission coefficients.
The cold fluid gets heated in contact with the
plate, gaining heat from the fluid to be cooled, and is then carried to a
cooling system (a chiller, or dry cooler or evaporative towers, for example),
bringing the fluid at a lower temperature.
Plate Heat exchangers offer
several advantages, being compact and smaller, and easily sizable, also to fit
new and changed working project conditions leading to a higher thermal duty,
with an increased thermal load to be managed. Strengthening a heat exchanger is
indeed achieved simply adding new plates, in order to answer a growth in
production, and then a growth in the quantity of heat generated, or due to
changes in the thermal conditions of the cooling cycle, for example laking of
cooling air or water at a certain temperature, meaning a loss in dissipating
capacity of the cooling system itself.
It's plain that is possible to
strengthen an existing heat exchanger only in case of an openable and
inspectable gasketed exchanger. If a brazed plate exchanger was the first
project choice, it won't be possible to increase the thermal load capacity once
it is installed, and an alternative solution has to be found to manage an
increased thermal duty (adding others exchangers, more powerful or bigger
exchangers).
In a plate inspectable heat exchanger is easy to vary the
thermodinamic state of the machine, adding new plates to the existing ones,
increasing thermal transfer surface area having extra dissipating capacity.
Transfer heat surface area needed to perform the thermal duty in a heat
exchanger is usually calculated in function of exchange process characteristics
and thermophysical properties of the fluids. Speaking of strengthening an
existing heat exchanger, kind of fluids and thermal process are supposed to
remain the same, and the only variable is the amount of heat load the machine
has to dissipate, or also a new temperature gap between the
fluids.
Strengthening a plate heat exchanger is then a quite simple
operation, only requiring a correct evaluation of the new thermal load or the
new fluids temperatures, in order to determine the right additional thermal
transfer surface area and the number of plates that can be inserted to obtain
the thermal performance needed.
Strengthening a heat exchanger requires a
series of operations, that in the same time allow to check operability and
affordability of the exchanger, and in case regenerating it cleaning and
changing damaged parts (gaskets or corroded plates), ensuring best performances
of the thermal machine at the end of the operation.
Exchanger opening and
cleansing
Plates and gaskets check and control
Addition of new
plates
Closing and pressure test
Strengthening a heat exchanger
requires usually only one working day, with very low machinery and plant
downtime.
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The 'Global and Chinese Variable Displacement Piston Pump Industry
ingunitscondens | 28 Avgust, 2019 03:36
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Agoda.com Asia’s global hotel booking site
ingunitscondens | 04 Jul, 2019 05:36
Agoda.com, Asia’s global hotel booking site and part of Nasdaq-listed
priceline.com Inc. (Nasdaq:PCLN), today announced a partnership with Delta Air
Lines (NYSE: DAL).
Semi-Hermetic Compressors Through the partnership, members of Delta's SkyMiles Frequent
Flyer Program can earn miles from SkyMiles when they book a hotel through
Agoda.com.
Delta Air Lines is the world's largest air carrier,
serving more than 160 million travelers a year. With a fleet of more than 700
aircraft, Delta has major international hubs in Amsterdam, Narita Japan, and
Paris, plus several hubs across the American continent. Delta's network
encompasses 346 destinations in 64 countries.
Now in its 30th year,
SkyMiles is one of the longest-running and most successful loyalty programs in
the travel industry. The program offers members multiple mileage-earning
opportunities including 100% miles on every purchased fare when flying with
Delta, Delta Shuttle, the Delta Connection, and by flying with SkyTeam® alliance
partners. Additional mile-earning opportunities are offered through other
airline partners, hotels and bank partners including the co-branded credit cards
in Guam, South Korea and the Philippines. Delta is introducing more ways to
redeem miles, including airline tickets, car rentals and hotel stays for
customers.
Through a co-branded, multi-lingual landing page
available in five languages, Delta customers are able to view Agoda.com's
inventory of more than 130,000 instantly-confirmable properties, allowing for
easy, convenient hotel booking. For non-English speaking customers, Agoda.com
offers hotel booking services in 32 different languages including Chinese
traditional and simplified, Japanese, Korean, Thai, French and German. Not only
can Delta members earn SkyMiles by booking their hotels through Agoda, they will
also earn Agoda Rewards Points, worth four per cent the price of their stay.
Managing Director North Asia at Agoda.com Mr. Wilfred Fan said, "We are
excited that through this partnership Delta will use its extensive promotional
and loyalty-based network to help their customers access the thousands of great
hotel deals on Agoda.com. Our website and customer support operations are
available in all languages spoken in Delta and SkyTeam's Asian destinations."
For more information on the SkyMiles program, Medallion status and
mileage redemption options, visit delta.com. For more information about
Agoda.com, contact PR
Agoda Company Pte Ltd (www.agoda.com) is a leading
Asia-based, online hotel reservations company, which specializes in securing the
lowest discount hotel prices. Agoda.com is part of Priceline.com (Nasdaq:PCLN).
Agoda's network includes more than 130,000 hotels worldwide. The multinational
staff of more than 600 professionals, located throughout the world, provides a
first-rate reservation service that uniquely combines local knowledge and local
connections to provide the best hotel deals to both business and leisure
travelers.
In addition, Agoda customers participate in the Agoda
Rewards Program, earning further discounts and free stays. Unlike programs that
limit travelers to a single chain, the Agoda Rewards Program allows customers to
redeem Rewards Points at thousands of hotels around the globe, at any time. Semi-Hermetic Compressor & Condensing Units A
member of the Pacific Asia Travel Association (PATA), Agoda's aim is to promote
travel by making it more affordable and more accessible to more people.
20 Cecil Street, #1401, Equity Plaza, Raffles Place 049705 Singapore
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