The discomfort or interference with visual perception when viewing a bright object against a dark background.

A system capable of rotating about one axis.

A unit used to rate the performance of a solar photovoltaic (PV) cells, modules, or arrays; the maximum nominal output of a PV device, in Watts (Wp) under standardized test conditions, usually 1000 Watts per square meter of sunlight with other conditions, ...

Ventilation that is created by the differences in the distribution of air pressures around a building. Air moves from areas of high pressure to areas of low pressure with gravity and wind pressure affecting the airflow. The placement and control of doors ...

A registered trademark name for houses built with tires, aluminum cans, and earth.

A refined petroleum product suitable for use as a fuel in internal combustion engines.

The use of devices to limit or prevent the release of pollution into the atmosphere.

A heat exchanger for recovering heat from flue gases for heating water or air.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

The distance between similar points on successive waves.

A construction element used for ceiling support.

The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating.

The practice of using a single meter to measure consumption and generation of electricity by a small generation facility (such as a house with a wind or solar photovoltaic system). The net energy produced or consumed is purchased from or sold to the gener ...

Standardized weights or volumes for heating fuels.

A house built into the ground or slope of a hill, or which has most or all exterior surfaces covered with earth.

A water heater that heats water before it is directly distributed for end use as required; a demand water heater.

A way of joining photovoltaic cells by connecting positive leads to negative leads; such a configuration increases the voltage.

A type of motor that has a rotor with electrical windings connected through slip rings to the external power circuit. An external resistance controller in the rotor circuit allows the performance of the motor to be tailored to the needs of the system and ...

The concept of capturing and converting the energy available in the motion of ocean waves to energy.