"The latest generation of InRow direct expansion cooling
puts efficiency and cost savings at the forefront for users, delivering the greatest partial-load energy savings available in a small but powerful system," he said.
CIPS said that production and new orders both continued to rise at a robust pace, albeit with the pace of expansion cooling
from earlier in the year.
The deficiencies in current modeling of economizers and fan control for unitary air conditioners or rooftop units (RTU) are discussed, followed by a description of a method to adapt the building simulation program EnergyPlus[TM] to more accurately simulate outside air economizer operation with single-and two-stage direct expansion cooling
. These strategies can be applied to RTUs that serve more than 40% of commercial floor area (EIA 2008).
"The four main technologies we see in the region are aisle containment, in-row cooling, chilled water and, for the smaller data centres with a limited number of racks, Direct eXpansion cooling
," he states.
Horizontal direct expansion cooling
coils for each furnace were linked with 21 SEER condensing units to provide building cooling.
* Underground Storage field test of an improved brine string stiffener in a salt cavern; cement bond log inspection tools; development of a possible mechanical integrity test based on gas expansion cooling
According to Kirkwood Facilities Manager Pete Pilgrim, Kirkwood has every type of conventional HVAC system used somewhere within its 300-acre campus: constant volume, constant volume reheat, VAV, steam and hot water, unit ventilators, small split systems, rooftops, chilled water, and direct expansion cooling
. "In 1979, a rudimentary computerized energy management system (EMS) was installed in an attempt to manage this diversity," he says.
Among the variations are single-duct and dual-duct systems, a range of capacities and numbers of zones, chilled water or direct expansion cooling
coils, and a range of heat sources for space heating, when needed.
Reheat of a cooled airstream using the heat from refrigerant liquid on its way to a direct expansion cooling
coil is desirable from an efficiency standpoint when compared with other dehumidification methods.