Tumble Dryers - Overview

Last updated 22/10/2020 23:13

Issue

  • Which types of tumble dryers are available in the market?
  • What are the main differences between tumble dryers? 
  • Which dryers are the most effective in terms of energy consumption?

Applies to

  • tumble dryers

Resolution

There are three main types of the Household Tumble Dryers sold on the market:

Condense Dryer with Heat Pump Technology - Most efficient in terms of energy consumption.

  • Drying air is heated by the hot side of the heat pump.
  • Hot air passes through the load and causes water evaporation.
  • Water vapour is condensed by the cold side of the heat pump and collected into a reservoir or directly passed to the drain pipe.
  • The heat pump's hot side re-heats the air afterwards for reuse, which conserves much of the heat within the dryer.
  • A portion of the water vapour and heat leaks outside and increases the ambient temperature.
  • After some time air in the internal loop is warmer and more humid what can increase the drying time.
  • Heat re-circulation is the big advantage of this type of dryer, with a positive effect on energy consumption.


Condense Dryer with Heater

  • Drying air is heated by the heater.
  • hot air passes through the load and causes water evaporation.
  • Water vapour is condensed by the heat exchanger and collected into the reservoir or directly passed to the drain pipe.
  • The heat exchanger is cooled by the forced stream of ambient air.
  • A portion of the water vapour and heat leaks outside and increases the ambient temperature.
  • After some time in operation air in the internal loop is warmer and more humid, which can increase drying time.


Exhaust Dryer with Heater

  • Drying air is heated by the heater.
  • Hot air passes through the load and causes water evaporation.
  • Hot air carrying water vapour is exhausted outside the room through the ventilation hose.
  • Heat is wasted, causing high energy consumption and hence high drying costs.
  • After some time air in the internal loop is drier, decreasing drying time.

Tumble Dryers Comparison:

 


Condense Dryer with Heat Pump


Condense Dryer with Heater


Exhaust Dryer with Heater

energy consumption

lowestlowabove average

drying temperatures

lowhighhigh

drying delicacy

*****

drying cycle time

******

energy saving*

****

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performance drying cost

*****

* compared to exhaust dryers

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