THREE YEARS OF ARRAY PERFORMANCE OF DIFFERENT TYPES OF EVACUATED TUBULAR SOLAR COLLECTORS
The scope of the work presented in this paper is to make a detailed experimental performance assessment of arrays of different types of evacuated collectors operating between 80 degrees and 100 degrees C. The arrays were mounted on the Solar Laboratory of the Joint Research Centre in Ispra for various cooling experiments. The evacuated collectors used are the Sanyo STC-CU-250, the Philips VTR 261 and the Philips VTR 361. The arrays were monitored intensively during the last three years. Durability aspects and ageing were also studied with the help of infrared thermovision techniques. The results of this installation are also presented within Task VI of the IEA Solar Heating & Cooling Program. The experiments showed that very good efficiencies may be obtained with evacuated tubular collectors. During summer conditions daily collector efficiencies of around 50 % have been measured, at operating temperatures of about 60 degrees C above ambient temperature. The principle conversion losses are the optical losses. Some significant durability problems were put in evidence. The results demonstrate that evacuated tubular collectors could be very promising for applications where higher operation temperatures are required, e.g.: + solar heating systems with seasonal storage + district heating applications + industrial heat + combined solar heating and cooling.
Bibliographic Reference: FIRST EC CONFERENCE ON SOLAR HEATING AMSTERDAM (THE NETHERLANDS), APRIL 30-MAY 4, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPR E 31518 ORA
Availability: Can be ordered online
Record Number: 1989122069600 / Last updated on: 1987-01-01
Available languages: en