Building Management Hawaii - (Page 30)
New Trends Emerge in HVAC Systems
Variable refrigerant flow, smart thermostats lauded
BY DREW SANTOS
Multi Air Conditioning System for Buildings
echnology and efficiency are key factors in the quickly
changing HVAC market. Leading trends in air
conditioning for 2015 include variable refrigerant flow (VRF)
and multi-zone systems along with smart thermostats and
advanced duct systems that eliminate fiberglass wrap or
liner from the building envelope.
While we will see a change in the national minimum
Seasonal Energy Efficiency Ratio rating go from 13 to 14
SEER, there are many systems that deliver 20 to 30 SEER.
VRF and split system technology saves energy and money.
Fujitsu's VRF systems are designed for commercial
buildings and allow the building owner to "zone" the air
conditioning load so that only rooms that are occupied or
require cooling are being cooled. By utilizing smaller indoor
air handlers each room is individually computer controlled
to minimize operating time and maximize savings. This
is in direct contrast to a large chiller or package unit air
conditioning system that comes on all at once and cools all
spaces no matter if the rooms are occupied or not.
VRF technology brings precise temperature control
to each zone and can be controlled from a central
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Fujitsu's AIRSTAGE V-II-SERIES DC Twin Rotary Inverter VRF System.
remote control or by a remote computer system. For
noncommercial buildings, Fujitsu has multi-zone systems
called HFI (Hybrid Flex Inverter). The HFI system is less
expensive than a VRF system and allows you to cool up
to eight zones from a single compact and quiet outdoor
unit. The HFI system is ideal for single-family homes,
condominiums and light commercial applications where
three-phase power is not available.
Innovations in equipment design and
thermostats are only the beginning.
We are also seeing a revolution in the
way building owners duct cool
air throughout a building envelope.
Both the VRF and HFI systems utilize Inverter
compressor technology. Inverters are a big reason why
we are seeing a rapid increase in SEER ratings. Inverter
compressors do not come on at full speed and run 100
percent like traditional compressors.
An inverter compressor ramps up and down slowly,
depending on the cooling load. This allows for a "soft"
start at minimum amperage draw. As the cooling load
increases so does the speed of the compressor. The beauty
of an inverter is that if the compressor only needs to run at
Table of Contents for the Digital Edition of Building Management Hawaii
Editor’s Note: Energy Management
Insider’s Guide to Picking a Security Company for Your Property
Dealing with Graffiti and Glass Damage
Hawaii’s High-Tech Roofing Products
Building and Management Expo Set
Installing New & Improved Windows
Window Film Cuts Glare, Energy Bills
Reassessing Hurricane Preparedness
An ESA Can Deliver Peace of Mind
Checking a Building’s Energy Score
Managing PV Energy Consumption
The Ultimate Energy-Efficient Building
What to Know About Chiller Plants
New Trends Emerge in HVAC Systems
Walk-throughs Vital to Engineers
Trapped in the Web of Act 326
Faces: The IREM Banquet
Building Management Hawaii