Page 179 - Design of Solar Thermal Power Plants

164 3. GENERAL DESIGN OF A SOLAR THERMAL POWER PLANT

TABLE 3.5 Requirements for Measurement Parameters Within the Quasi-Dynamic
Test Period

Parameter Value Parameter Value

Global solar 300e1,100 W/m 2 Inlet 1 C
irradiance temperature of
heat-transfer
fluid within the
collector
Ambient air 1.5 C Outlet 1 C more than

temperature temperature of the inlet
heat-transfer temperature of
fluid within the heat-transfer
collector fluid within the
collector
Mass flow of 1% of the set value Mean ambient 1w4 m/s
heat-transfer fluid when being within the wind speed
testing sequence,
10% of the set value
when being between
testing sequences

However, actual quasi dynamic test time depends on natural environ-
mental conditions of the test site.
Task 4 of the SolarPACES and task 33 of solar heating and refrigeration
organization of the IEA jointly constitute the research program of Solar
Thermal for Industrial Processes. In this program, according to the quasi
dynamic test method, thermal performance test for the parabolic trough
solar collector is conducted [28]. However, outlet temperatures of heat-
transfer fluid of parabolic trough collectors applied in this program
have not exceeded 250 C. Furthermore, there has been no literature to

demonstrate that the quasi dynamic test method in European standard
EN 12975-2 is completely applicable for the parabolic trough solar col-
lector with an outlet temperature of heat-transfer fluid exceeding 300 C.

3.3.3 Test Methods to Determine the Thermal Performance of
the Parabolic Trough Collector
3.3.3.1 Current Status of Thermal Performance Test Method
In 1977, America published the ASHRAE 93-2003 standard “Test
Methods to Determine Thermal Performance of Solar Collectors,” the
newest version of which is ASHRAE 93-2010. As indicated in Section Two
of the standard method, this standard is applicable for nonconcentrating
and concentrating solar collectors; heat-transfer fluid flows into the