This device can automatically turn the heater off at night and on in the morning.

A characteristic applied to domestic water heaters that is the amount of gallons raised 100 degrees Fahrenheit per hour (or minute) under a specified thermal efficiency.

A material with high absorbtance and low emittance properties applied to or on solar absorber surfaces.

A device that can be set to automatically turn appliances (lights) off and on at set times.

A study of the transformation of energy from one form to another, and its practical application. (see Law(s) of Thermodynamics above).

The complete cycle of stages (evaporation and condensation) of refrigeration or of the refrigerant.

These fluids can be either water or steam trapped in fractured or porous rocks; they are found from several hundred feet to several miles below the Earth's surface. The temperatures vary from about 90 F to 680 F (32 C to 360 C) but roughly 2/3 range in te ...

Power generation equipment or system capacity to meet peak power demands.

A method of depositing thin semiconductor films used to make certain types of solar photovoltaic devices. With this method, a substrate is exposed to one or more vaporized compounds, one or more of which contain desirable constituents. A chemical reaction ...

The process of moving existing loads to off-peak periods.

A construction material made by compressing earth in a form; used traditionally in many areas of the world and widely throughout North Africa and the Middle East.

The conversion of heat into electricity by the use of thermocouples.

The supportive structure of a building.

A company that specializes in undertaking energy efficiency measures under a contractual arrangement whereby the ESCo shares the value of energy savings with their customer.

Costs that are repetitive and occur when an organization produces similar goods or services on a continuing basis.

The inherent characteristic of a material to inhibit the transfer of energy. In electrical conductors, electrical resistance results in the generation of heat. Electrical resistance is measured in Ohms. The heat transfer resistance properties of insulatio ...

A device for converting the flow of a fluid (air, steam, water, or hot gases) into mechanical motion.

A safety device consisting of a short length of relatively fine wire, mounted in a holder or contained in a cartridge and connected as part of an electrical circuit. If the circuit source current exceeds a predetermined value, the fuse wire melts (i.e. th ...

The direction, at any point on the earth that is geographically in the northern hemisphere, facing toward the South Pole of the earth. Essentially a line extending from the point on the horizon to the highest point that the sun reaches on any day (solar n ...

A ratio of the work or useful energy output of a system versus the amount of work or energy inputted into the system as determined by using the same energy equivalents for energy in and out. Is used as a measure of the steady state performance or energy e ...