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Title:
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Development and testing of a sorbent filled heat exchanger for use in compact solid sorption cooling systems
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Author(s):
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Published by:
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Publication date:
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ECN
Energy Efficiency in Industry
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1-6-2005
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ECN report number:
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Document type:
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ECN-RX--05-121
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Conference Paper
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Number of pages:
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Full text:
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7
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Download PDF
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Presented at: International Sorption Heat Pump Conference 2005, Denver, USA, 22-24 juni 2005.
Abstract:
A vacuum test-rig was used to determine
the rate of convective heat transfer between a heat transport fluid
and a heat exchanger under dynamic conditions. The heat transfer coefficient
for the compact plate-fin type heat exchanger under study is 1800 W/m2K
at a water flow rate of 4 l/min. When using the same heat exchanger
on the fin-side filled with silica gel, the rate of heat transfer depends
on the amount of sorbent that is heated or cooled. The heat transfer
rate becomes variable in time, making this approach less suitable; only
an average heat transfer coefficient for a specific period of time can
be derived for this situation. Using the test-rig equipped with a condenser/evaporator,
an overall cooling power of 1 kW was determined when the heat exchanger
was filled with wet silica gel beads. This corresponds to 300 W cooling
power per kg dry sorbent. Based on these results theoretically a cooling
power density of 75 kW/m3 can be reached using microporous
silica gel/H2O in combination with the proposed plate-fin
heat exchanger.
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