An air conditioning system that has two ducts, one is heated and the other is cooled, so that air of the correct temperature is provided by mixing varying amounts of air from each duct.

Ethyl alcohol (C2H5OH)

A furnace grate that moves fuel through the combustion chamber

A class of energy producer that produces both heat and electricity from a single fuel.

Insulation made from rockwool fibers, fiberglass, cellulose fiber, vermiculite or perlite minerals, and composed of loose fibers or granules can be applied by pouring directly from the bag or with a blower.

Metal, usually galvanized sheet metal, used to provide protection against infiltration of precipitation into a roof or exterior wall; usually placed around roof penetrations such as chimneys.

ICS solar systems are also called "batch" or "breadbox" water heaters. They combine the collector and storage tank in one unit. The sun shining into the collector strikes the storage tank directly, heating the water. The large thermal mass of the water, p ...

The losses that result from inherent resistance in electrical conductors and transformation inefficiencies in distribution transformers in a transmission and distribution network.

The process by which water in air changes from a vapor to a liquid due to a change in temperature or pressure; occurs when water vapor reaches its dew point (condensation point); also used to express the existence of liquid water on a surface.

A thermodynamic property of a substance, defined as the sum of its internal energy plus the pressure of the substance times its volume, divided by the mechanical equivalent of heat. The total heat content of air; the sum of the enthalpies of dry air and w ...

A cooling device that uses mechanical energy to produce chilled water.

A measure of a fuel's (liquid) ease of self-ignition.

A popular term used for an evaporative cooling device.

The process of degrading organic material (biomass) by microorganisms in aerobic conditions.

An amount to be paid for energy periodically by a customer without regard to demand or energy consumption.

The quantity of heat required to change the temperature of one unit weight of a material by one degree.

A solid-state electrical device that converts light directly into direct current electricity of voltage-current characteristics that are a function of the characteristics of the light source and the materials in and design of the device. Solar photovoltai ...

The temperature that a system is designed to maintain (inside) or operate against (outside) under the most extreme conditions.

Nonglossy paint with a relatively high absorptance.

Any material that can be burned to make energy.