Page 174 - Design of Solar Thermal Power Plants

3.3 THERMAL PERFORMANCE OF PARABOLIC TROUGH COLLECTOR 159

comparisons; experimental model established on the basis of parabolic
trough collector performance analysis; research on performance values
of parabolic trough evacuated tube by comparing configurations of
nonvacuum and vacuum parabolic trough evacuated tube; prediction on
the truncation factor of parabolic trough collector. Furthermore, simu-
lation and control models of parabolic trough power plant have also
been established by fully considering the thermal performance of
parabolic trough collectors (e.g., a linear prediction control model
developed for 30 MW parabolic trough solar power plant; the dynamic
simulation model for a parabolic trough solar power plant with thermal
storage facilities; a concentration field analytic model that considers heat
loss of nonlinear parabolic trough collectors; a PATTO model that is
capable of predicting the overall performance of parabolic trough power
plant under abnormal working conditions; model computer program
SimulCET for parabolic trough power plant based on experiences and
physical derivation).
It is a remarkable fact that technical standards of CSP generation
are of great significance for the accelerated reduction of costs.
Therefore, CSP generation and thermochemistry organization (Solar-
PACES) subordinate to International Energy Agency (IEA) is now
carrying out the international project TASK I CSP generation system,
which includes the development of testing procedures and standards
for the parabolic trough collector field. Although many works have
been conducted in order to realize standardization, thermal perfor-
mance test method of parabolic trough collector still needs to be
improved. EN 12975-2 standard that is applicable for concentrating
solar collectors has already been an integral part of ISO 9806, which is
now being revised. Under the framework of SolarPACES, a work-
group for CSP generation standards was founded in 2011. A standard
must be improved while orienting toward a common framework,
which shall also be intensified in terms of the following aspects,
namely qualification, certification, testing procedures, components and
system endurance test, entrusting procedures, model-based results,
concentration field modeling, etc.

3.3.2.2 Brief Introduction to the ASHRAE 93 Steady State Test
Method
The newest version of ASHRAE 93 was published in 2010 [23], which
specifies that in order to be consistent with the international state stan-
dard ISO 9806-1 “Test Methods for Solar CollectorsdPart 1: Thermal
Performance of Glazed Liquid Working Medium Heating Collectors
Including Pressure Drop” [28], partial testing process and certain re-
quirements on measurement parameters in the previous version have
been adjusted in this revised standard.