ADVANCED SOLAR COLLECTORS FOR WATER HEATING
A solar water heating scheme, using advanced evacuated tube type collectors, has been installed to serve the GEC site canteen at Whetstone, Leicester in the United Kingdom. The scheme uses fin and tube type evacuated tube collectors having a total effective absorption area of 50 m2 supplying water directly to a 2500 litre pre-heat storage tankwater is taken from the storage tank to calorifiers where, if necessary, auxiliary heat is supplied to achieve the final use temperature of 60circC. The mean water demand of the system is some 3750 litres/day. The system has been in operation since June 1984 and a detailed monitoring exercise was carried out from September 1984 to June 1986. It was found that the canteen water demand had a good match to the solar radiation profile and a solar system yearly average efficiency of 38% was achieved. The associated solar contribution was around 24% of system demand, again on a yearly average basis. In practical terms the system performed well experiencing only minor difficulties. Some 1.6% of the tubes failed due to loss of vacuum during the life of the project. A comprehensive economic analysis is presented. This indicates that the present retrofit'' system cannot be considered an economic proposition against existing site energy costs. However, energy cost structures on other sites may be more favourable. Also, marked improvements to the unit energy cost emerge if the system is specified at the early stages of a new building. Non-UK areas, such as Southern France and Italy, benefit from significantly greater availability of solar energy which can halve the unit energy costs.
Bibliographic Reference: EUR 11277 EN (1988) FS, PP 71, ECU 7.00, AVAILABILITY: EUROFFICE, LUXEMBOURG, BP 1003, GDL
Availability: Can be ordered online
Record Number: 1989126077000 / Last updated on: 1989-05-01
Available languages: en