SO8754 : Worcestershire Royal Hospital - looking behind the terminology

taken 3 years ago, near to Warndon, Worcestershire, Great Britain

Worcestershire Royal Hospital - looking behind the terminology
Worcestershire Royal Hospital - looking behind the terminology
This device is labelled Toshiba Inverter and looks like a fairly standard air conditioning unit. But what's with the word 'inverter'. I was puzzled - in power electronics an inverter converts DC to AC but what has that got to do with air conditioning.

Google eventually spilt the beans. A conventional air conditioning compressor runs at constant speed on mains AC, irrespective of the actual load on the machine and is therefore turned on and off as the temperature oscillates between set points. A more efficient way (20% claimed typical saving) is to run the compressor motor continuously at a variable speed that matches the load. The secret is to take the 50 hz AC mains and rectify it to DC before using the inverter to convert it back to variable frequency AC to match the cooling load more precisely. Who would have thought there was so much clever design behind the apparently mundane.
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SO8754, 293 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Tuesday, 26 August, 2014   (more nearby)
Submitted
Thursday, 28 August, 2014
Geographical Context
Health and social services 
Primary Subject of Photo
Machine 
Subject Location
OSGB36: geotagged! SO 8770 5491 [10m precision]
WGS84: 52:11.5374N 2:10.8812W
Camera Location
OSGB36: geotagged! SO 8770 5491
View Direction
North-northwest (about 337 degrees)
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Worcestershire Royal Hospital  Air Conditioning Unit 

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