When heating a building the heat loss is the total number of btu's that a system needs to extract from elsewhere or produce through combustion or resistance.

The heating value of a substance, usually a fuel or food, is the amount of heat released during the combustion of a specified amount of it.

The amount of heat that must be rejected to the earth in the cooling mode to provide cooling to the space.

Heat pipes are a heat recovery device that use a multi-phase process to transfer heat from one airstream to another. Heat is transferred using an evaporator and condenser within a wicked, sealed pipe containing a fluid which undergoes constant phase change to transfer heat.

The amount of fuel energy required to produce electrical energy

A container or vessel designed to aid heat recovery from various sources including the shell-and-tube, encapsulated, direct-contact container.

A energy recovery heat exchanger that recovers heat from a hot gas stream, such as a combustion turbine or other waste gas stream.

Heat recovery ventilation, also known as mechanical ventilation heat recovery, is an energy recovery ventilation system which works between two sources at different temperatures.

A thermal reservoir, also thermal energy reservoir or thermal bath, is a thermodynamic system with a heat capacity so large that the temperature of the reservoir does not change when a reasonable amount of heat is added or extracted.

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems.

The heat transfer coefficient or film coefficient, or film effectiveness, in thermodynamics and in mechanics is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat.

The process in which the ambient temperature is raised by adding heat to the air, to reach higher air temperature.

Pipes through which steam or thermal oil passes to heat HFO or liquid cargoes in order to reduce their viscosity for pumping purposes or to maintain a required temperature.

Heating degree day is a measurement designed to quantify the demand for energy needed to heat a building.

A heating element converts electrical energy into heat through the process of Joule heating.

A measure of heating efficiency for air source heat pump equipment on an annual basis, expressed as the heating energy provided to the space (Btu) divided by the electric energy consumed (Watt-hour) over the entire heating season.

The heating value of a substance, usually a fuel or food, is the amount of heat released during the combustion of a specified amount of it.

A heat transfer fluid is a gas or liquid that takes part in heat transfer by serving as an intermediary in cooling on one side of a process, transporting and storing thermal energy, and heating on another side of a process.

The up and down linear motion of a ship in the sea.

A very light line that is thrown between the ship and the berth and is used to draw the messenger line ashore.