MHI Develops Lubricant Oil-free Centrifugal Chillers Through Adoption of
Magnetic Bearing System
"ETI-40MB and 50MB" Models Added to Built-in Inverter "ETI Series"
Tokyo, Aug 21, 2013 - (JCN Newswire) - Mitsubishi Heavy Industries, Ltd. (MHI)
has developed two models of highly efficient centrifugal chillers featuring a
totally lubricant oil-free magnetic bearing system. The adoption of the new
magnetic bearing system - the first application in Japan in commercial-use
centrifugal chillers - eliminates the need for lubricant oil. As no oil changes
are required, significant reductions are realized in both maintenance work and
related costs. The two newly developed models - the "ETI-40MB and
50MB" - offer cooling capacities ranging from 350 to 500 refrigeration
tons(1) (RT). They will be launched into the Japanese domestic market this fall
as new additions to the company's "ETI Series" of compact
centrifugal chillers with built-in inverters.
In the compressor of the new models - which is the core component of
centrifugal chillers - MHI has adopted a magnetic bearing system for the
rotation shaft of the impeller; this system causes the shaft to float, enabling
reduction in friction drag to a minimal level. The impeller blades have also
been newly designed. Through these innovations, the new models have achieved
even higher compressor efficiency. Adoption of the magnetic bearing
configuration also significantly reduces both maintenance work and related
costs by eliminating the need for lubricating oil and oil filter changes.
The ETI-40MB/50MB, chillers having a 400 RT refrigeration capacity, achieve a
rated COP (coefficient of performance)(2) of 6.3 and IPLV (integrated part load
value)(3) of 9.0. The new models, which use HFC-134a, a chlorine-free and zero
ozone depletion potential (ODP) refrigerant, achieve higher energy-saving
performance than the pre-existing ETI-40 models, and will enable further
reductions in energy consumption for customers while at the same time
contributing to efforts to prevent global warming through lower CO2 emissions.
They also require less installation space and weigh less (by 15 percent and 20
percent, respectively) owing to the reduction in the number of compressors to
only one, in contrast to the two needed in the ETI-40 models. These advantages
not only enable downsizing but also facilitate carrying-in and installation
MHI launched the ETI Series, initially with cooling capacities from 150 to 500
RT, in May 2008. The original models offered outstanding efficiency and compact
size responding to the needs of customers who require centrifugal chillers with
lower carbon emission levels, reduced energy requirements and smaller
installation space needs. Subsequently, in 2011 the company enhanced its
product portfolio up to 700 RT in tandem with expansion of the market for
inverter models, resulting in expansion of its customer base.
Following the market launch of the ETI-40MB/50MB, going forward MHI will now
pursue commercialization of larger systems incorporating magnetic bearings, in
its ongoing quest to respond to an ever-broader range of customer needs for
(1) Refrigeration ton represents the refrigerating capacity for turning 2000
lb of 0 degree Celcius water into 0 degree Celcius ice in 24 hours. 1 RT =
2) Coefficient of performance (COP) indicates the ratio of a system's
useful energy output versus its energy input. The higher a system's COP,
the higher is its energy-saving efficiency. In the case of refrigeration
systems, COP = rated cooling capacity (kW) / electricity consumption (kW). The
cited value was calculated based on Japanese Industrial Standards (JIS).
3) Integrated part load value (IPLV) measures the efficiency of
air-conditioners under a variety of conditions: several partial operational
load ratios and coolant water temperatures similar to those in actual usage, to
reflect seasonal changes in operational conditions. The cited value was
calculated based on JIS.
About Mitsubishi Heavy Industries
Mitsubishi Heavy Industries, Ltd. (MHI), headquartered in Tokyo, Japan, is one
of the world's leading heavy machinery manufacturers, with consolidated
sales of 2,820.9 billion for the year ended March 31, 2012. MHI's diverse
lineup of products and services encompasses shipbuilding, power plants,
chemical plants, environmental equipment, steel structures, industrial and
general machinery, aircraft, space rocketry and air-conditioning systems. For
more information, please visit the MHI website at www.mhi.co.jp.
Mitsubishi Heavy Industries
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