Rudy- CH 7 - Electrical Systems_StudyGuide

Rudy- CH 7 - Electrical Systems_StudyGuide - HA 355...

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HA 355 – Hospitality Facilities Management 1 Chapter 7: Electrical Systems I. Introduction GET EXTRA HO NOTES FROM KATIE Approximately 80% of a hospitality facility’s energy use is electricity Dangerous! - Leave it to the professionals unless you know what you are doing II. What is electricity? The result of the negative charges of electrons and the positive charges of protons in an atom. Creates an electrostatic charge. Definitions Volt (V) - Amperes (amps, A; in formulae, I ) - Resistance (ohms, Ω) - Watt (W) - Kilowatt (kW) - Kilowatt-hour (kWh) - Fall 2005
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HA 355 – Hospitality Facilities Management 2 Chapter 7: Electrical Systems Grounding - Direct Current (DC) – 1 direction Time Alternating Current (AC) - made by passing a metal conductor through a magnetic field. Alternates direction between positive and negative wave pattern Frequency, a.k.a cycles, hertz (Hz), kilohertz (KHz) - Number of times the “wave” cycles per second US frequency=60 times per second Europe = 50 times per second Ohm’s Law – cannot be broken; v (volts) = IR (amps x resistance) Watt’s Law—cannot be broken; W (watts) = VI (volts x amps) III. How is electricity distributed? 1. Getting it to your facility: Transmission lines - high voltage Fall 2005
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HA 355 – Hospitality Facilities Management 3 Chapter 7: Electrical Systems Step-down transformer: voltage too high, transformer brings down to usable voltage—step-up transformer does opposite Do you have to expend power to change power? No 2. Once it is at your facility: a) First stop, transformer Transformer cooling options: friction gives off heat Dry: aka air-cool transformer, circulate air around transformer to cool Oil-cooled: generally older A Need to know which it is for fire department and haz mat control A Older oil-cooled transformers contained PCB’s; potentially hazardous substance Transformer location: Above-ground: green/gray metal box, sits on top of ground, outside buildings, often blocks view when driving, usually warm to touch
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