Point and Line Focusing Receiver
Technologies
Laltu Chandra
Indian Institute of Technology Jodhpur
chandra@iitj.ac.in
Concentrated solar thermal technologies
 Line Focusing (Flux concentration: up to 100 suns)
 Parabolic Trough Concentrator based
 Linear Fresnel Reflector based
 Point Focusing (Flux concentration: 1000 or more suns)
 Dish concentrator based
 Heliostat based
 1 sun = 1kW/m2
 Higher flux concentration  higher temperature
Line Focusing Technologies
Parabolic trough
(Direct solar steam Technology, PSA Spain
Receiver tube and support
Diameter of absorber tube = 70mm
Diameter of receiver tube = 115 mm
Length of absorber tube between support brackets = 4m
Overall length could be 1000s of meters
Linear Fresnel Reflector
Linear Cavity Receiver
This document contains company-proprietary data,
and is meant for use of IITJ only.
Reflector Unit
Type
Reflector material
Specular
Reflectivity
Global reflectivity
Quantity
Elastically curved glass mirror
3 mm thick Solar grade low iron glass – mirror from SaintGobain Glass, Germany
92.5% (In 3º Cone)
93.5 % in standard conditions,
1.5
8 nos
measured to ISO 9050, AM
Point Focusing Technologies
Dish concentrator
Heliostat based
central solar tower
PS10 (DSG) 
Tubular and Volumetric Receiver
Principle of volumetric air receiver [Hoffschmidt et al. (2003)]
Types of Volumetric Receivers :
a) Closed volumetric receiver
b) Open volumetric receiver
Closed and open volumetric air receivers
Closed air receiver
Open air receiver
Acknowledgements
All the sources of the presented
materials are hereby duly
acknowledged.