CEAC-2020-04-April

News
AHR Expo Attendees Preview Award-
Winning Innovations and Solutions That
Maximize Rooftop IEER and Reduce
GWP
Designers of rooftop units are facing a pair of environmental
challenges: the U.S. Department of Energy’s 2023 energy
efficiency standards requirement of a 15-percent increase in
integrated energy efficiency ratio (IEER), and the introduction
of regulations by a growing number of states to replace
HFC refrigerants like R-410A with lower-GWP alternatives.
At AHR Expo 2020, Danfoss showcased a substantial portfolio
of components that solve these challenges by helping manufacturers
improve part-load efficiency and switch refrigerants,
often with minimal redesign costs, and shared with
visitors the system-level benefits revealed in laboratory tests.
Tackling the 2023 IEER Challenges: iMCHE,
VZH Scrolls, MCX, and Tandem Manifolds
Several of the innovations and solutions combine to give
OEMs an immediate boost in part-load efficiency. Some of
the components can achieve savings of more than 15 percent
on their own, helping OEMs meet the more stringent 2023
IEER regulations.
The Danfoss iMCHE enables several circuits to share the heat
transfer area in a single coil, improving part-load efficiency
by more than 20 percent, maximizing heat-transfer efficiency,
and reducing refrigerant charge in a compact shape,
which minimizes weight.
The third-generation VZH variable-speed inverter scroll has a
higher part-load performance and wider operating map than
ever before. The scrolls range from 4 to 26 TR, which can be
further expanded to 52 TR in a hybrid tandem, and, like all
Danfoss inverter scrolls, now include Intermediate Discharge
Valve (IDV) technology for maximum part-load efficiency.
The powerful new MCX15B2 and MCX20B2 controllers are
ideal for use in rooftop units. As enhanced versions of the
popular MCX-B-series units, they offer best-in-class connectivity
and safety, along with new compressor control logic
for industry-leading Danfoss VZH inverter scrolls, enabling
system designers to get the biggest possible benefit from
variable-speed compression in any conditions.
Pre-assembled tandem and trio manifolds enable OEMs to
improve their system’s seasonal efficiency while reducing
complexity in the supply chain and manufacturing processes.
Danfoss manifolds are designed to minimize OEMs’ system
losses, and are assembled in Danfoss facilities using the
highest quality manufacturing techniques to ensure reliability.
They include multiple combinations in even and uneven
tandems and trios, and hybrid tandem configurations — and
all feature patented Organ Pipe technology for optimized oil
management under part-load conditions.
Ultimate Flexibility R-410A Retrofitting:
Multi-Refrigerant Options
With more than half the U.S. population living in a state
included in the United States Climate Alliance, many manufacturers
are working on two or more rooftop configurations
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| Chief Engineer