Alternative Energy Technologies%2C Solar and Wind Power Systems

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Thermal Store

A The rm a l Sto r e i s a cy l i nde r o f w a te r , w h ich can be hea ted byva r ious m eans e.g . so la r , gas, o i l , w ood -bu r n ing s tove e tc .

Diagram A

The w a te r i s used as a p r im ary sou rce o f hea t fo r t he unde r f l oo r

hea t ing i n m odern hom es and bu i l d ings w he re the Bu i l d ing Code LRegu la t i ons fo r I nsu la t i on have been com p l ied w i th , and a l so fo r th eh e at i n g o f m a in s h o t w a te r b o th p re -h e at i n g t h ro u g h a co i l w i t h i nt h e t h e rm a l st o re a n d b y a n e x te rn a l p l ate h e a t e x c h an g e r t h ro u g hw h i ch t h e s to re d h o t w a te r i s ci r cu l a te d .

A s t h e t e m p e ratu r e o f t h e u n d e r f l o o r h e at i n g n e ed s t o b e k e p t

a ro u n d 3 8 c , t h e w a te r i s ci r cu l a te d f r o m t h e t h e rm a l st o re b y a p u m pto t h e m a n i f ol d w h e re an a d j u s ta b l e b le n d i n g v a lv e a ll o w s t h e r e tu r nw a te r t o b e f e d b ack t o m a in ta i n a co n s tan t t e m p e ratu r e .

Diagram

B

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Wh ere so la r ene rgy i s u t i l i sed , th e inpu t i s i n the l ow er ha l f o f theth e rm a l sto r e . Wa t e r i s hea ted in th e so la r pane l, and a pum p th a t i s

con t ro l l ed by senso rs i n bo th th e pane l and th e cy l i nde r , sw i t ches onw h e n t h e t e m p e ratu r e i s h i g h e r i n t h e p a n el . Th i s al l ow s a m o ree f f i ci en t h e at t r a n s fe r i n t o t h e c oo l er w a te r , w h i ch i s u s e d b y t h eu n d e r f l o o r ci r cu i t . I n a d d i t i o n t h e co i l i n t h a t s ect i o n o f t h e t h e rm a ls to re is u se d t o p re -h e at t h e m a in s w a te r f l o w i n g t h r o u g h t h e co i lbe fo re be ing passed th rough th e ex te rna l p la te hea t exchange r fo r

use as th e domes t i c ho t w a te r . ( s ee Diag ram D be low )

Diagram

C

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Th i s p l ate h e a t e x ch a n g e r u t i l i se s w a te r f r o m th e t o p o f t h e t h e rm a l

s to re w h e re a h i g h e r t e m p e ratu r e ca n b e m a in ta i n e d a n d ca n b ehea ted by th e gas bo il e r o r e lec t r i c imm ers ion heate r . Wh en th e ho tt a p i s t u rn e d o n a n d w a te r f l o w s , a f l o w -s w i t c h i s en e rg i se d ,s w i t ch i n g o n a p u m p to c i r cu l a te w a te r f r o m th e t o p o f t h e cy l i n d e r ,t h r o u g h t h e h e at e x c h an g e r a n d b a ck t o t h e b o t t o m o f t h e c y l i n d er .The p re -h eated w a te r i n th e co i l passes to t he p la te hea t exchange rw h e re it i s b oo ste d b y t h i s w a te r f r o m t h e t h e rm a l s t o re an d t h e n t o

th e h o t t a p .

Diagram

D

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