Glossary Energy in Buildings

There are 16 entries in this glossary.
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Glossaries

Term Main definition
TRV
Thermostatic Radiator Valve - provides basic temperature control of an individual room by controlling flow of water into the radiator
Author - Ewan Paterson, Metro Commercial
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The EPC A to G scale
The EPC ‘A to G’ scale and energy labels present the calculated value of the BER are displayed on a seven band graphical scale where a letter band corresponding to a  range of emissions ratings, with “A+ (net zero carbon or better)” being the most efficient (followed by “A”) and “G” being the least efficient.
Author - Ewan Paterson, Metro Commercial
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Radiant heater seasonal efficiency
Radiant heater seasonal efficiency (heat generator seasonal efficiency) is equivalent to thermal efficiency (net calorific value). 
Author - Ewan Paterson, Metro Commercial
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Power efficiency
Power efficiency is the total annual power output divided by the total annual fuel input of a CHP unit.
Author - Ewan Paterson, Metro Commercial
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Pitched roof

Pitched Roof in an energy model

Roof with pitch greater than 10⁰ and less than or equal to 70⁰. If the pitch is greater than 70⁰, it must be considered a wall.

Author - Ewan Paterson, Metro Commercial
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Heat Pump

A heat pump is a device used to transfer heat energy from one source of heat (air, ground or water) to another destination for several end energy uses (space heating, water heating, cooling). Mechanical heat pumps exploit the physical properties of a volatile evaporating and condensing fluid known as a refrigerant. The heat pump compresses the refrigerant to make it hotter on the side to be warmed, and releases the pressure on the side where heat is absorbed.

Some devices are reversible. This kind of heat pump works in either thermal direction to provide heating or cooling to the internal space. It employs a reversing valve to reverse the flow of refrigerant from the compressor through the condenser and evaporation coils. Heat pump technologies can be aerothermal devices, which take energy from the ambient air (indoor or outdoor), geothermal (energy extracted from the ground) or hydrothermal (energy extracted from water - lake or subterranean water sources). Generally, hydro- and geothermal heat pumps are grouped together as geothermal technologies.

Author - Ewan Paterson, Metro Commercial
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Glazed door

Glazed doors in non-domestic EPCs

When doors have more than 50% glazing, then the light/solar gain characteristics must be included in the calculation. This is achieved by defining these doors as windows and accounting for the opaque part in the frame factor parameter.

Author - Ewan Paterson, Metro Commercial
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Flat roof in a non-domestic building

Flat roof in a non-domestic building

Roof with pitch of 10⁰ or less. If greater than 10⁰, the roof is a pitched roof

Author - Ewan Paterson, Metro Commercial
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EPCs for permanently unconditioned buildings
While an EPC is not required for permanently unconditioned buildings (i.e. buildings which do not use energy to condition the indoor climate and are expected to remain this way), it is possible to voluntarily produce EPCs for unconditioned buildings. Permanently unconditioned buildings are different to those which are currently unconditioned but are intended to be conditioned prior to occupation, and which should be modelled as per the guidance on shell and fit out buildings in Section 6. Permananetly uncinditioned buildings are buildings such as agricultural cow sheds.
Author - Ewan Paterson, Metro Commercial
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Energy Performance Certificates
Energy Performance Certificates (EPCs) provide prospective buyers/ tenants with information about the energy performance of a building and practical advice on improving performance. Cost effective recommendations for improving the energy performance of the building detailed on the certificate must meet the Scottish building regulations, be specific to the individual building and be technically feasible. The EPC displays the “rating” of a building in the form of the approximate annual Building CO2 Emission Rate (BER) in kg per m² of floor area per year, rated on a seven band scale
Author - Ewan Paterson, Metro Commercial
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Cooling system
Cooling system means the complete system that is installed to provide the comfort cooling to the space. It includes the cooling plant and the system by which the cooling medium effects cooling in the relevant zone and the associated controls. This will in some cases be a complete packaged air conditioner.
Author - Ewan Paterson, Metro Commercial
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Cooling plant

Cooling plant means that part of a cooling system that produces the supply of cooling medium. It does not include means of distributing the cooling medium or the delivery of the cooling into the relevant zone. It may consist, for example, of a single chiller or a series of chillers.

Author - Ewan Paterson, Metro Commercial
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Condensing boiler
A boiler designed to make use of the latent heat released by the condensation of water vapour in the combustion flue products. The boiler must allow the condensate to leave the heat exchanger in liquid form by way of a condensate drain.
Author - Ewan Paterson, Metro Commercial
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Combined Heat and Power
Combined heat and power (CHP) means the simultaneous generation of heat and power in a single process. The power output is usually electricity, but may include mechanical power. Heat outputs can include steam, hot water or hot air for process heating, space heating or absorption cooling.
Author - Ewan Paterson, Metro Commercial
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CIBSE
Chartered Institution of Building Services Engineers UK-based institution for building services including heating, ventilation and air conditioning.
Author - Ewan Paterson, Metro Commercial
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