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Long-Term Hydraulic Performance of Dehumidifying Heat-Exchangers With and Without Hydrophilic Coatings
An experimental study has been carried out to investigate the long-term wetting characteristics of dehumidifying finned tube heat-exchangers (coils). The coils were subjected to up to 1000 cycles in which they were alternately dipped into distilled water for 15 minutes and then dried with a fan for 45 minutes. Wetting durability was determined for three uncoated coil, two were coated with proprietary coatings, and a coil with a zinc coating sprayed on the downstream face, and with different fin press oils. Wind tunnel tests on fully wet coils under dehumidification were conducted. The advancing and receding contact angles werer measured by periodically removing small fin samples from the coils. One coating maintained the receding contact angle below 15° throughout the cycle tests. The advancing contact angles were much higher than the receding contact angle. The best coating maintained the wet/dry pressure drop ratio below 1.34 throughout the 1000 cycles. The wet/dry pressure drop ratio was correlated as a function of receding contact angle. An effect of oil was observed on uncoated coils in the initial 100 cycles but vanished after 500 cycles.
Long-Term Hydraulic Performance of Dehumidifying Heat-Exchangers With and Without Hydrophilic Coatings
An experimental study has been carried out to investigate the long-term wetting characteristics of dehumidifying finned tube heat-exchangers (coils). The coils were subjected to up to 1000 cycles in which they were alternately dipped into distilled water for 15 minutes and then dried with a fan for 45 minutes. Wetting durability was determined for three uncoated coil, two were coated with proprietary coatings, and a coil with a zinc coating sprayed on the downstream face, and with different fin press oils. Wind tunnel tests on fully wet coils under dehumidification were conducted. The advancing and receding contact angles werer measured by periodically removing small fin samples from the coils. One coating maintained the receding contact angle below 15° throughout the cycle tests. The advancing contact angles were much higher than the receding contact angle. The best coating maintained the wet/dry pressure drop ratio below 1.34 throughout the 1000 cycles. The wet/dry pressure drop ratio was correlated as a function of receding contact angle. An effect of oil was observed on uncoated coils in the initial 100 cycles but vanished after 500 cycles.
Long-Term Hydraulic Performance of Dehumidifying Heat-Exchangers With and Without Hydrophilic Coatings
Min, Jingchun (author) / Webb, Ralph L. (author) / Bemisderfer, Charles H. (author)
HVAC&R Research ; 6 ; 257-272
2000-07-01
16 pages
Article (Journal)
Electronic Resource
Unknown
| British Library Conference Proceedings | 2001
| British Library Online Contents | 2001
Wetting Coatings for Dehumidifying Heat Exchangers
| British Library Conference Proceedings | 2001
Wetting Coatings for Dehumidifying Heat Exchangers
| British Library Online Contents | 2001
Wetting Coatings for Dehumidifying Heat Exchangers
| Taylor & Francis Verlag | 2000