25-08-2014, 12:40 PM
THERMO-ACOUSTIC
REFRIGERATOR
THERMO-ACOUSTIC.pptx (Size: 971.58 KB / Downloads: 152)
REFRIGERATION
Refrigeration is a process in which work is done to move heat from one location to another.
Uses of Refrigeration :
Industrial uses
Air conditioning
Food storage and distribution
Medical applications
DISADVANTAGES
VAPOUR COMPRESSION
Require CFC, HCFC, or other ozone harming refrigerants
Increase global warming effect
Loud/noisy
Typical efficiency is 40-55% of Carnot limit
Moving parts and intricate design
Prone to breakdown
VAPOUR ABSORPTION
Requires large heat source
Can't use electricity directly
Require CFC, HCFC, or other ozone harming refrigerants
Increase global warming effect
Inefficient
IMPROVEMENTS
Insulate the sound leaks by isolating the system.
Replace the closed cap with a speaker to increase the efficiency by co-generation.
If both ends of a stack are connected to a heat exchangers thus coupling the stack to a heat source and sink, the transfer of heat would be more efficient.
Use conductive material for hot section of resonator
Widen the resonator and use a cone to reduce the losses due to rapid area change.
More practical and efficient reliable temperature sensors such as thermistors should be used.
The composition of stack material may also be changed to any conducting materials like gold,silveror copper.