IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask A Report A2, November 2009<br />

5. Selection guide<br />

In the following tables a compar<strong>at</strong>ive characteriz<strong>at</strong>ion is given, summarizing the technical<br />

discussion in the previous sections.<br />

solar thermal sub‐system<br />

solar collector<br />

function<br />

or main characteristic<br />

additional<br />

inform<strong>at</strong>ion<br />

accumul<strong>at</strong>ion of solar he<strong>at</strong><br />

fl<strong>at</strong> pl<strong>at</strong>e collector cost efficient robust, reliable<br />

vacuum‐tube collector low thermal losses high collector efficiency,<br />

low collector area required<br />

concentr<strong>at</strong>ing collector optimum efficiency for direct radi<strong>at</strong>ion high collector efficiency,<br />

suitable for double‐effect chiller<br />

he<strong>at</strong> exchanger<br />

separ<strong>at</strong>ion of hydraulic loops<br />

with anti‐freeze liquid in solar loop neg<strong>at</strong>ive impact on thermal performance<br />

due to driving temper<strong>at</strong>ure difference<br />

without measures for freeze‐protection required pure w<strong>at</strong>er as solar he<strong>at</strong> carrier<br />

or drain back system<br />

or w<strong>at</strong>er‐glycol mixture directly supplied to<br />

sorption chiller<br />

he<strong>at</strong> storage<br />

storage of surplus solar he<strong>at</strong><br />

storage 1<br />

storage 2<br />

storage 3<br />

direct link between collector <strong>and</strong> he<strong>at</strong><br />

consumer<br />

no bypass, all hot w<strong>at</strong>er flows pass through<br />

storage<br />

not applicable<br />

simple construction, reduced flow<br />

facilit<strong>at</strong>es str<strong>at</strong>ific<strong>at</strong>ion<br />

simple construction, decouples volume<br />

flows, no parasitic flows<br />

storage 4 charging <strong>and</strong> discharging section‐wise switching valves for selction of he<strong>at</strong> storage<br />

section<br />

storage 5 exact str<strong>at</strong>ific<strong>at</strong>ion gravity loading system<br />

storage 6 charging <strong>and</strong> discharging section‐wise switching valve for selction of he<strong>at</strong> storage<br />

section<br />

storage 7 charging <strong>and</strong> discharging section‐wise switching valve for activ<strong>at</strong>ion of addional<br />

storage volume<br />

storage 8 enhanced storage capacity adjustment of storage volume by<br />

supplementary install<strong>at</strong>ion of storage tanks<br />

storage 9<br />

l<strong>at</strong>ent he<strong>at</strong> storage: maximum storage<br />

density<br />

oper<strong>at</strong>ion with characteristic temper<strong>at</strong>ures<br />

for loading <strong>and</strong> unloading<br />

DHW (domestic hot we<strong>at</strong>er)<br />

DHW 1<br />

tap w<strong>at</strong>er he<strong>at</strong>ing<br />

not applicable<br />

DHW 2<br />

not applicable<br />

DHW 3 external he<strong>at</strong> exchanger instantaneous tap w<strong>at</strong>er prepar<strong>at</strong>ion<br />

DHW 4 external tap w<strong>at</strong>er storage storage covers load peaks<br />

backup<br />

auxiliary he<strong>at</strong> source<br />

parallel hot w<strong>at</strong>er boiler parallel install<strong>at</strong>ion, loading of he<strong>at</strong> storage<br />

possible<br />

serial hot w<strong>at</strong>er boiler serial install<strong>at</strong>ion, boosts hot w<strong>at</strong>er supply<br />

temper<strong>at</strong>ure, no loading of he<strong>at</strong> storage<br />

without<br />

page 15

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