WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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Zenith angle

energy

Zenith angle is the angle between vertical line and the line intersecting the sun.

Zero-energy building

energy

A building with net zero energy consumption, meaning the total amount of energy used by the building on an annual basis is equal to the amount of renewable energy created on the site or in other definitions by renewable energy sources offsite, using technology such as heat pumps, high efficiency windows and insulation, and solar panels.

Zero-energy universe

energy

The zero-energy universe hypothesis proposes that the total amount of energy in the universe is exactly zero: its amount of positive energy in the form of matter is exactly canceled out by its negative energy in the form of gravity.

Zero-heating building

energy

A building having essentially zero heating demand, defined as having heating demand less than 3 kWh/(m2a).

Zero-point energy

energy

Zero-point energy is the lowest possible energy that a quantum mechanical system may have.

Zigzag transformer

energy

A zigzag transformer is a special-purpose transformer with a zigzag or "interconnected star" winding connection, it is used as a grounding transformer, creating a missing neutral connection from an ungrounded 3-phase system.

Zinc

marine

A hard, white metal with a good resistance to atmospheric corrosion. It is used as a coating for steel in a process called galvanizing and also as an alloying element.

Zinc silicate paints

marine

Zinc-filled paints based on an inorganic binder. Zinc silicates give very hard films, and are resistant to solvents.

Zinc-air batteries

energy

Zinc–air batteries are non-rechargeable metal–air batteries powered by oxidizing zinc with oxygen from the air.

Zinc-air fuel cells

energy

Zinc–air fuel cells are mechanically rechargeable metal–air batteries powered by oxidizing zinc with oxygen from the air.

Zinc–carbon battery

energy

A dry cell primary battery that provides direct electric current from the electrochemical reaction between zinc and manganese dioxide.

Zone of visual influence

energy

A zone of visual influence is the area from which a development or other structure is theoretically visible. It is usually represented as a map using color to indicate visibility.

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