RENEWABLE INDOOR RADIANT COOLING AND EARTH TUBE HEAT EXCHANGER HYBRID FOR THERMAL COMFORT IMPROVEMENT
This study investigates the applicability of hydronic radiant cooling system charged with night cooled water to cool down building in Sarawak particularly for low income building to a thermally acceptable level. The system uses night sky as well as the ground as a heat sink source to passively coo...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | en |
| Published: |
UKM
2016
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/38540/3/RENEWABLE%20INDOOR%20-%20Copy.pdf http://ir.unimas.my/id/eprint/38540/ https://spaj.ukm.my/jsb/index.php/jbp/index |
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| Summary: | This study investigates the applicability of hydronic radiant cooling system charged with night cooled
water to cool down building in Sarawak particularly for low income building to a thermally acceptable
level. The system uses night sky as well as the ground as a heat sink source to passively cool the
building while operating at a low energy level. Results from building energy simulation program or
Energy Plus shows that for a stand-alone hydronic radiant system only 77% of the time the thermal
condition could meet ASHRAE acceptable PMV thermal condition between -0.5 and + 0.5. Another
simulation of the radiant and earth tube system hybrid further improved the indoor thermal condition
significantly by 100% to meet the same PMV level. The hybrid system was able to improve the
baseline uncomfortable operative temperature of 37ºC to 28.5ºC while meeting the average comfort
zone upper limit for Malaysia of 30.1 ºC. Simulation on energy spent shows that as much as 94%
energy could be saved by using the hybrid system. This level of saving is not impossible as
renewable night cooled water was used to charge the indoor hydronic radiant cooling system. |
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