Glossary of Terms

Confused about some of the terms used in the heating industry? Eurotech have created a helpful glossary of terms to help.

Geothermal – heat stored in the ground vertically from 1 metre to 200 metres
Airthermal - heat available in the atmosphere as an energy source
High capacity – large output heat pumps over 100Kw in size
COP – Coefficient of performance, the output power of a heat pump in relation to power consumed. 
OVI – Ochsner vapour injection, increasing the pressure by injecting the gas
EET – electronic expansion technology, electronically operating the expansion in the heat pump
SPF – seasonal performance factor, a value on the evaporator to increase the efficiency
Heat pumps – machines used to extract heat from a lower temperature source and deliver it at a higher temperature. 
Expansion – increase in volume due to temperature change
Compression – a reduction in volume.  By reducing the volume it will increase the temperature and pressure of the gas. 
Designed for the Irish climate – the design features are created to deal with high humidity cold air
Operating range – boundaries of operation.  The lowest and highest air temperature within the range of operation. 
Retrofit – fitting a heating system to replace an existing heating system
Flow temperature – the temperature of the flow to the heating system
Air source temperature – temperature of the external air source that is being used as the primary energy source
Three phase – power supply by the energy provider is either 3 phase or single phase
OTE controller – O-Tronic easy is a control device developed to manage the operation of a heat pump. 
Output range – output varies with the temperature of source energy.  The minimum to maximum out put of the machine is its output range. 
Sequence controller – the ability of the control unit to organise more than one heating device to operate together or separately based on heating demand. 
Weather guided – allowing the weather to influence the amount of heat being produced by reducing the flow temperature as outside air temperature increases.  The ratio is adjustable. 
Polyethylene pipe – pipe made from polyethylene, a by product of crude oil refinement
Cross linked polyethylene pipe – is also known as pex pipe.  Extra characteristics given to the pipe for strength.  The process of linking modules together during the extraction process. 
Kw (kilowatts) – power measurement or energy measurement.  This is usually associated to time as in Kw/h (kilowatt hours)
Brine – the water and glycol solution used in closed loop horizontal and vertical collectors
Circulating pump – water being moved in a heating system to transfer heat in either direction
Delta      T (delta t) – the difference between the flow and return temperatures is called the      T or temperature difference.  This is usually measured in degrees Kelvin
U tube – the tube inserted into a vertical borehole installation to extract heat
Probe – a device inserted into a vertical borehole installation to check temperature or extract heat
Bentonite – a substance that expands when wet.  It may be used to seal boreholes to prevent pollution of the energy source. 
Vertical borehole – hole drilled vertically into the ground to extract heat at varying depths
Ground collector (also known as horizontal collector or flat loop collector) - A collector to gather heat from the ground at a shallow depth of 1 metres to 3 metres, it is referred as a horizontal collector as it is laid horizontally across the ground.  Flat loop collector refers to the looping of the pipe laid in the ground and covered by soil. 
Super split evaporator - An evaporator specially designed to extract heat from high moisture/high humidity
Closed loop – a geothermal or solar collector which is filled with Brine and sealed systems
Open loop – a heat collection system where water is drawn from the earth, the heat is extracted and then returned to the earth.  This system is not under pressure. 
Radiant temperature – heat being transferred by radiant rays (similar to the sun), this is often used to describe the type of heat from an underfloor heating system. 
Fan coils – heating units which contain a built in fan used to disperse heat.  They can replace radiators and work at a lower flow temperature
Ochsner – Austrian based Heat Pump Company
Refrigerant gas – gas used in the internal operation of the heat pump to convert
F gas legislation – the objective of this legislation is to contain, prevent and thereby reduce emissions of fluorinated green house gases. 
Carbon tax – tax imposed by the government on fossil fuels to discourage use
Cost monitor – meter to record the running cost of a heat pump and allow track recording against time
Soft start – used for good starting torque and less starting current
Harp database – home heating appliance register of performance database for products used in Ireland. 
SEI – sustainable energy Ireland
SEAI – Sustainable energy authority of Ireland.
Buffer tank – a tank to assist in the smooth operation of a heat pump which stabilises the thermodynamic cycle of the heat pump ensuring maximum efficiency at all times. 
Solar collector – heat collecting device to trap heat from solar energy available in the atmosphere or in the ground
Boreholes – holes drilled into the earth at varying depths to extract water or energy. 

Water to water – or water water is a term used to describe a heat pump system using water from the ground as an energy source delivering heat to a water filled heating system.

One of the selling points for me was the ease at which the system can be used and it is so economical.

Vincent McNamee, Wonderyears crèche Donegal