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APC InRow User Manual

APC InRow
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990-4618A-001 InRow™ Chilled Water Air Conditioners Technical Specifications 21
Determining Cooling Capacity
IT equipment requires two acceptable limits in order for effective cooling to occur. These parameters are inlet
air temperature and flow rate of air through the IT equipment. It is entirely possible, though undesirable, to
design a computer room with enough heat removal capacity, but with an inadequate volumetric flow rate of
cool air supply. When this condition exists, IT equipment will be subjected to excessively high operating
temperatures on a localized basis due to recirculation, and cooling equipment will operate at less than optimal
efficiency. APC provides the necessary data to prevent this undesirable situation. The first table, titled
“Recommended Capacity Limitations,” shows the capacity limits based on air flow of the InRow CW. The
following tables, titled “Performance Specifications”, show the recommended maximum amount of load that
should be placed upon the cooling unit solely based on heat removal capability. The lesser of the two capacity
numbers obtained from the “Recommended Capacity Limitations” table and “Performance Specification” table
should be considered the maximum load capable of being served by the InRow CW. A definition of the terms
in these tables follows:
IT equipment air flow (kW/CFM and kW/l/s) — The average cooling air flow rate demanded by IT
equipment in liters per second (cubic feet per minute) divided by the total actual power dissipation of IT
equipment in kilowatts.
Recommended capacity limit (kW) —The corresponding maximum load in kilowatts capable of being
served by the cooling unit solely based on conservation of volumetric air flow.
DB (°C and °F) — The dry bulb temperature in degrees Fahrenheit and Celsius of the return air stream to the
cooling unit.
WB (°C and °F) — The wet bulb temperature in degrees Fahrenheit and Celsius of the return air stream to the
cooling unit.
CW delta T (°C and °F)The difference in temperature in degrees Fahrenheit between chilled water
entering and exiting the cooling unit.
Sensible net capacity (kW and BTU/hr) — The sensible net heat removal capacity of fan heat, of the cooling
unit at stated operating conditions.
Total net capacity (kW and BTU/hr) — The total (sensible + latent) net heat removal capacity of fan heat, of
the cooling unit at stated operating conditions.
Sensible heat ratio (SHR) — The sensible heat ratio of the unit at stated conditions. Sensible Heat Ratio is the
ratio of sensible capacity to total capacity.
CW flow rate (l/s and GPM) — The volumetric flow rate of chilled water through the cooling unit in gallons
per minute, and liters per second, that is required to result in the stated performance. For base loads, ACRC100
series units should not have a flow rate greater than 1.28 l/s (20.4 GPM) and ACRC500/ACRP500 series units
should not have a flow rate greater than 2.08 l/s (33 GPM); peak loads may exceed these flow rates by up to 25
percent for short time spans.
Total CW pressure drop (kPa and ft H
2
O) — The differential pressure observed between inlet and outlet
chilled water connections for the stated CW flow rate.

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APC InRow Specifications

General IconGeneral
RefrigerantR410A
MountingIn-row
Humidity Range20% to 80% RH
AirflowVaries by model (e.g., 1, 500 to 6, 000 CFM)
Power Supply208/230V or 400/480V, 3-phase
Operating Temperature Range65°F to 95°F (18°C to 35°C)