Today, however, crucial words used to describe these traditional topics have been stripped from an influential children's dictionary in favour of more 'modern' terms. Among the entries which have disappeared from the latest edition of the Oxford Junior Dictionary are disciple, coronation, empire, piglet and acorn. In their place come the likes of MP3 player, broadband, biodegradable, committee and celebrity.
A heat pump is a device that transfers heat energy from a source of heat to a destination called a heat sink. Heat pumps are designed to move thermal energy in the opposite direction of spontaneous heat transfer by absorbing heat from a cold space and releasing it to a warmer one. A heat pump uses a small amount of external power to accomplish the work of transferring energy from the heat source to the heat sink.
Water source heat pumps (WSHP) transfer heat from where it is not needed to where it is needed, minimizing the amount of energy required for heating/cooling. Standard water source heat pump installations include a boiler and a water cooling tower to add and remove energy from the loop. Geothermal heat pump installations use the ground, a body of water, or the aquifer as a heat exchange medium, eliminating the energy consumed by a boiler or water cooling tower.