Australian Solar Cooling Interest Group (ausscig) Conference 2013
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1 Autralian Solar Cooling Interet Group (auscig) Conference 1 Timothy Anderon1,Mike Duke, and Jame Caron 1 School of Engineering, Auckland Univerity of Technology School of Engineering, Univerity of Waikato 1 Autralian Solar Cooling Interet Group (auscig) Conference 1 Demand for cooling can be more ignificant than for heating in Autralia Unglazed olar collector have often been ued a mean of providing low cot heating to wimming pool Under night condition when there i no olar radiation and the ky temperature i low, unglazed collector can radiate heat to the ky
2 Autralian Solar Cooling Interet Group (auscig) Conference 1 Unglazed collector are typically polymer tyle mat that are laid on top of a roof, often leading to poor aethetic due to their lack of integration Want to integrate into the building not onto the building Autralian Solar Cooling Interet Group (auscig) Conference 1 Long run metal roofing i widely ued for dometic, commercial and indutrial application Can be ued for low temperature pool heating through to dometic water heating High emiivity polyeter paint urface 4
3 Autralian Solar Cooling Interet Group (auscig) Conference 1 Long run roofing made of coloured teel Cooling trough added to profile Channel formed in the trough are encloed forming a rier tube having an inlet and outlet at oppoite end 5 Autralian Solar Cooling Interet Group (auscig) Conference 1 Grey aborber 1-D teady tate thermal model In the abence of olar radiation the collector act a a radiator S = 4ε σt p a ( T ε = ( ( Tdp /1) +.7( Tdp /1) ) ( 1+.4 n.5n +.8 n ) Steady tate outdoor thermal tet pm T = ε T.5 T a S ) Parameter Symbol Value Unit Emittance of plate ε p.95 Sytem flow rate m 4 l/h Collector Area A 6. m Aborber thickne t.5 mm Tube Hydraulic d h 8.5 mm Diameter Tube Spacing W. m Inulation Conductivity k.45 W/mK Back Inulation L b.1 m Thickne Aborber Conductivity k ab 5 W/mK 6
4 Autralian Solar Cooling Interet Group (auscig) Conference 1 Collector coupled to a cylinder which wa heated during the day then cooled at night In the abence of any radiation, there i a net heat lo from the collector of ~5 W/m Heat Gain/Lo (W/m ) Temperature ( C) Time (h) 16 Tank Ambient Time (h) 16 7 Autralian Solar Cooling Interet Group (auscig) Conference 1 Potential to ue large area of collector to operate in heating mode during daytime, with torage in a hot cylinder and at night with torage in a cold cylinder Radiant Heat Lo (W/m ) Experiment Modelled : 1: : : : Time (h) 8
5 Autralian Solar Cooling Interet Group (auscig) Conference 1 ε Four citie choen for 4 5 examination, Auckland, Sydney, Bribane and 5 Perth 15 Sky temperature i 1 typically 15- below 5 ambient for all citie Hour Per Year Auckland Sydney Bribane Perth T ambient -T ky.5 T = ε Ta ( ( T /1) +.7( T /1) ) ( 1+.4n.5n.8n ) = dp dp + 9 Autralian Solar Cooling Interet Group (auscig) Conference 1 Sky temperature 4 depreion ignore the 5 influence of convective heat tranfer 5 Stagnation temperature 15 below the ambient ε pσ ( Ta ε Ta ) temperature Ttag = Ta 5 hc + 4ε pσta Perth and Sydney eem mot uitable Per Year Hour Auckland Sydney Bribane Perth T ambient -T tagnation 1
6 Autralian Solar Cooling Interet Group (auscig) Conference 1 Able to achieve cooling in the order of 5W/m (temperature of ~1ºC oberved) Well uited for moderate cooling load under ummer condition if torage ued Sydney and Perth a ytem area of 1m averaging a radiant heat lo of 5W/m may be able to be ued for approximately h annually; thi would lead to cooling of approximately 1kWh/annum. 11 Autralian Solar Cooling Interet Group (auscig) Conference 1 1
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