A transient calorimeter pyrheliometer of high accuracy
- Univ. of Science and Technology of China, Anhui (China)
The problems of how to improve the accuracy and keep the stability of the transient calorimeter pyrheliometer have been solved by the following methods: (i) hemispheric mirror shell with a small hole at its top is situated over a copper disk sensor. The inner wall of the shell has high reflectivity, acting as a specular reflector. In this way, the effective absorptance of the sensor with the mirror can approach unity, and can be kept in long-term stability; (ii) a micro-computer is adopted as controller and data processor of the pyrheliometer. So the total error of the measuring system is less than 0.1%. Results of comparing this instrument with the cavity-type pyrheliometers, such as Eppley H-F self-calibrating and TMI Mark-VI pyrheliometer, show that the maximum relative deviation, the average deviation, and the standard deviation are less than 0.6%, 0.12%, and 0.23%, respectively.
- OSTI ID:
- 6301320
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (USA), Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (USA) Vol. 45:2; ISSN SRENA; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140100* -- Solar Energy-- Resources & Availability
ABSORPTION
ACCURACY
CALORIMETRY
COMPARATIVE EVALUATIONS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
COPPER
DATA PROCESSING
DESIGN
ELEMENTS
EQUIPMENT
ERRORS
MEASURING INSTRUMENTS
METALS
MODIFICATIONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PROCESSING
PYRHELIOMETERS
SOLAR EQUIPMENT
SOLAR FLUX
SPECTRAL REFLECTANCE
STABILITY
TELESCOPES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS