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.
Heat pump is a term commonly used for heat transferring or circulating devices, and machines like refrigerators, air conditioners and freezers. As opposed to the heat engine, heat pump converts mechanical energy into thermal energy. This task is mainly achieved with the help of fluids known as the ârefrigerantsâ. heat pump can be used to either heat the atmosphere or lower the temperatures, depending upon the type of output desired. However, a âfurnaceâ can be used only for heating. Furnaces cannot be considered as a cooling device.