HP Modular Cooling System Instrukcja Instalacji Strona 58
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Glossary
Table 15: Terms and abbreviations
Term Description
Apparent power A value of power for AC circuits that is calculated as the product of RMS current
times RMS voltage, without taking the power factor into account.
ASL Above sea level
Btu/hr British thermal units per hour. The amount of heat required to raise one pound of
water 1°F/hr, a common measure of heat transfer rate.
CFM Cubic feet per minute, commonly used to measure the rate of air flow in an
air-conditioning system.
Chilled water system A type of air-conditioning system that has no refrigerant in the unit itself. The
refrigerant is contained in a chiller, which is located remotely. The chiller cools
water, which is piped to the air conditioner or HP Modular Cooling System to
cool the space.
Derate To lower the rated capability of an electrical or mechanical apparatus.
Heat exchanger Cooling unit that maintains two separate environments inside and outside of the
cabinet or room. It can be water-to-water, water-to-air, or air-to-air configurations,
in either direction.
Inrush current The peak current flowing into a power supply the instant AC power is applied.
This peak is usually much higher than the typical input current because of the
charging of the input filter capacitors. When switching power supplies are first
turned on, they present high initial currents as a result of filter capacitor
impedance. These large filter capacitors act like a short circuit, producing an
immediate inrush surge current with a fast rise time. The peak inrush current can
be several orders of magnitude greater than the supply’s typical current.
Leakage current A term relating to current flowing between the AC supply wires and earth ground.
The term does not necessarily denote a fault condition. In power supplies,
leakage current usually refers to the 60-Hz current, which flows through the EMI
filter capacitors that are connected between the AC lines and ground.
Maximum input current The operating current of the product equal to the maximum load divided by the
minimum input voltage.
Power factor The ratio of true power (watts) to apparent power (VA) in an AC circuit. In power
conversion technology, power factor is used in conjunction with describing the
AC input current to the power supply.
RMS Root-mean-square. Term that refers to the most common mathematical method of
defining the effective voltage or current of an AC wave. To determine RMS value,
three mathematical operations are carried out on the function representing the AC
waveform:
(1) The square of the waveform function (usually a sine wave) is determined.
(2) The function resulting from step 1 is averaged over time.
(3) The square root of the function resulting from step 2 is found.
Theoretical maximum power
consumption
Maximum wattage of a given configuration, assuming worst-case conditions
(thermal tolerances, workloads, and so forth) on all system components. It is
extremely unlikely that any customer will experience this level of power
consumption.
True power In an AC circuit, true power is the actual power consumed and is measured in
watts. It is distinguished from apparent power by eliminating the reactive power
component that might be present
Typical input current The operating current of the product measured using a typical load and target
voltage.
- HP mc-Series 5042 Rack 1
- Site Preparation Guide 1
- Preface 2
- Safety in material handling 3
- Japanese notice 3
- Chapter 1: Overview 4
- Product overview 5
- Key MCS 5042 components 6
- Item Reference 8
- 1 Water module 8
- 2 Fan module 8
- 3 AC transfer switch 8
- MCS 5042 specifications 9
- Overview 10
- Warning: 11
- 9A: Top view 17
- 9B: Bottom view 17
- 10A: Top view 18
- 10B: Bottom view 18
- 11A: Bottom view 20
- 11B: IT rack-side view 20
- 12A: Bottom view 21
- 12B: Right IT rack-side view 21
- Electrical considerations 24
- Coolant source planning 29
- MCS 5042 hose openings 35
- Coolant requirements 44
- Environmental considerations 53
- Control system 53
- Delivery survey form 54
- Pre-installation checklists 55
- Metric equivalents 57
- Formulas 57
- Glossary 58
- Legal notices 60
- For more information 60
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Hoshizaki DCM-500BWH-OS manuels
Manuels d'utilisation et guides de l'utilisateur pour Congélateurs Hoshizaki DCM-500BWH-OS.
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