Renewable Energy Sources for the mCCHP-SE-RES Systems - Design for Micro-Combined Cooling, Heating and Power Systems - page 116

Fig. 14 Wood pellet feed
mechanism

Wood pellets concrete store, prefabricated storage tanks (metal or plastic),

fabric stores supported by metal frames, bagged pellets (can be stored practically
anywhere).

—

￿

Wood chips — concrete stores next to boiler room, storage tanks (metal or

￿

plastic, above/below ground).

6 Solar Thermal Collectors

Spiru Paraschiv

Solar thermal collectors represent the main element of most solar energetic systems.
Collectors absorb the solar irradiation and transform it into heat. This heat is then
transferred to a

fluid (which may be water, air, or oil) which ows through the

collector. The heat conveyed by the fluid may be used to heat buildings, water, to

produce electric energy, to dry wood and agricultural products, to prepare food, or it
may be stored in an accumulation tank.
The ef

ciency of collecting solar energy depends of the type of collector used. Each
collector is designed to absorb light with smaller wave lengths, received from the Sun
(0.3 ʼ m in length) and to prevent the loss of heat with wave lengths of 2 - 10 ʼ m.

Solar thermal collectors may be classi ed in keeping with their mobility and

their operating temperature (Table 2 ).
There are two types of basic solar collectors without concentration and with
concentration. Collectors without concentration have the same surface for inter-
ception and for absorption of the solar irradiation, while collectors with a system of
following the Sun and with concentration usually have re

ecting concave surfaces