Based on current boiler efficiency metrics (or measuring
thermal efficiency at 100% output), an example 12 MMBtu/hr
conventional boiler is rated at 2% radiant losses, or 240,000
Btu/hr energy lost through the boiler shell. With significantly
reduced water content and surface area, Miura’s compact
boiler units are rated at only 0.5% radiant losses, or
minimizing losses to only 60,000 Btu/hr.
A typical 12 MMBtu/hr boiler is most likely operating at
about 1/3 of its rated output. With a reduced operating
load, radiant losses actually triple to 6% (proportionate with
reduced input vs. rated shell losses) with the conventional
boiler. In comparison, the compact modular example allows
2 out of the 3 units to be completely shut off, resulting in a
total of only 0.5% radiant losses or 20,000 Btu/hr.
Thus, Miura’s modular On-Demand boilers provide superior
energy management capability by reverse-engineering its
technology with actual boiler operating conditions in mind.
The result: enhanced load-matching performance with
increased efficiency and reduced environmental impact.
Radiant Losses: 12 MMBtu/hr Input at 100% Output
Conventional System
240,000 Btu/hr energy loss
- Single 12 MMBtu/hr unit input
- Rated at 2% radiant loss
Modular On-Demand Systems
3 x 20,000 Btu/hr losses = 60,000 Btu/hr energy loss
- 3 x 4 MMBtu/hr unit input
- Rated at 0.5% radiant loss
Radiant Losses: 12 MMBtu/hr Input at 33% output Conventional System
Results in 6% total radiant loss
- Single 12 MMBtu/hr unit at 33% =4 MMBtu/hr input
- 240,000 Btu/hr energy loss
Modular On-Demand Systems
Only 0.5% total radiant loss
- 3 x 4 MMBtu/hr units (only 1 operating)
- 1 x 20,000 Btu/hr losses =20,000 Btu/hr energy loss
Compact Footprint Saves Space and Money
The compact footprint of Miura boilers offers great flexibility when designing a new or reconfiguring an existing boiler room. In addition to being half the size of a traditional boiler plant, Miura boilers eliminate tube pull-space and door-swing space requirements typical of conventional designs. This allows configuration of the boiler room for double the output of an existing boiler plant or reduction of its size by over fifty percent.
In-Service Efficiency – a More Complete Measure of
Boiler Performance
When choosing a boiler, fuel cost savings are a primary
consideration given that fuel costs represent over 90% of
the system’s total lifecycle costs. However, current boiler
efficiency standards do not sufficiently account for all energy
losses accumulated during a boiler’s operating cycle to bridge
the gap between "catalog efficiency" and actual fuel costs.
Beyond simple Combustion Efficiency (“Fuel-In” Efficiency)
and Thermal Efficiency ("Fuel-to-Steam" Efficiency), it is
important to understand all of the remaining energy losses in
the energy mass balance to have a clear understanding of a
boiler’s operating, or In-Service Efficiency.
Referring to the diagram on the right, you will notice that
several additional operational losses contribute to a boiler’s
overall In-Service Efficiency. While it is typical to expect around
15% in boiler efficiency reductions associated with combined
Fuel-In and Fuel-to-Steam losses, there is as much as an
additional 20% in In-Service Efficiency reductions associated
with accumulating operational losses including: start-up
losses, pre- & post-purge losses, blow-down losses, loss at high
turn-down, losses at changing loads & radiation losses at idle/
stand-by. When accounted for, these additional losses provide
energy managers with the information needed to optimize
their system’s energy performance.
Miura’s On-Demand boiler technology is engineered with the full
spectrum of operating losses in mind with specific design features
that address each to provide superior energy management capability
and industry-leading In-Service Efficiency.
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Multiple Installation System
