Most engineers probably feel they are safely code compliant with their waterside economizers
if their system is configured per Steve Taylor's June column:1 as an integrated economizer
with the heat exchanger in series with, and upstream of, the chillers, if their cooling tower is intelligently selected for their peak load condition, and if they provide the appropriate controls to initiate economizer
mode during the appropriate exterior conditions.
The Liebert DSE cooling system and its refrigerant economizer
is an example of the innovations being adopted by the industry to achieve sustainability in their data centers.
high-limit controls and why enthalpy economizers
and energy recovery systems can be useful for reducing energy requirements associated with the conditioning of outdoor air required for ventilation, and may also be able to provide free cooling under some conditions.
Sounds impressive, but do these economizers
cool data centers by bringing outside air into a building and distributing it to servers.
In typical applications of integrated (7) waterside economizers
for data centers, the return chilled water is precooled by the tower's condenser water, reducing the load on the chiller.
Emerson Network Power, a business of Emerson, and the world s leading provider of critical infrastructure for information and communications technology systems, today announced that the California Energy Commission (CEC) has approved the use in California data centers of the Liebert DSE thermal management system with the Liebert EconoPhase Pumped Refrigerant Economizer
. The Liebert DSE system represents a break-through technology that uses no water and saves up to 50 percent of thermal energy, through its patented design and advanced Liebert iCOM controls.
"Waterside and airside economizers
, design considerations for data center facilities." ASHRAE Transactions 116(1).
* All cooling AHUs have outdoor air economizers
whose performance is enhanced by the relatively warm 63[degrees]F [17[degrees]C] supply air temperature, which reduces mechanical cooling operation by more than 2,000 hours per year in this climate compared to overhead systems supplying 55[degrees]F [13[degrees]C].
30% overage on lighting due to control sensor failure +6.8% Lighting overage's effect on HVAC +1.6% Dirty AHU filters +4.1% Variable speed fans running constantly +8.4% Variable flow pumps running at full speed +10.6% Fouled cooling tower +1.3% Fouled chiller tubes +2.2 Poor refrigerant charge +3.7% Other factors in the analysis are inefficient humidity and temperature setpoints and setbacks as well as ventilation malfunctions (economizers
, outside air and C02 sensors).
Contract notice: Bids for the assignment of the supply of two banks and economizers
collector top of the walls of the boiler furnace ~c~ of the wte plant run by tecnocasic spa.