A study of water-mist recirculation system for filtration and cooling effect in the kitchen hood ventilation system
Water-mist spray system in several heavy-duty kitchen hood canopies are installed to efficiently control the high heat loads and grease emissions produced from the cooking process and for safety purposes. Cold water is used in the water�mist system and work as a mist curtain inside the exhaust pl...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4138/1/24p%20NOR%20ADRIAN%20NOR%20SALIM.pdf http://eprints.uthm.edu.my/4138/2/NOR%20ADRIAN%20NOR%20SALIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/4138/3/NOR%20ADRIAN%20NOR%20SALIM%20WATERMARK.pdf |
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| Summary: | Water-mist spray system in several heavy-duty kitchen hood canopies are
installed to efficiently control the high heat loads and grease emissions produced
from the cooking process and for safety purposes. Cold water is used in the water�mist system and work as a mist curtain inside the exhaust plenum of the canopy. The
main purpose of this study is to reduce the water consumption by introducing the
water-mist recirculation system to replace the current method water-mist system since
it is working as water loss. A standard ASTM 2519 and UL 1046 full-scaled
experiment was developed in the laboratory. An existing Halton Europe/Asian water�mist operating system was adopted in this study. Twelve (12) cycles (at 24 hours
water-mist activation) has been studied to determine the maximum water-mist
activation cycle. The data was collected at two (2) hours water-mist activation at
every water-mist recirculation cycle. The water-mist spray fluids viscosity is 0.7 cP
from fresh water until the 4th cycle (8 hours water-mist spray) and increase 14.29%
(0.8 cP) at 5th cycle to 12th cycle. On average, the difference in gas emissions
percentage for CO concentration between fresh water until 4th cycle is 10.81 –
18.92% while the CO2 concentration is 12.33 – 18.22%. On average, the difference in
cooling effects percentage for ducting temperature between fresh water until 4th cycle
was 5.55% while the hood temperature was 2.33%. From the study, the water-mist
recirculation system could save up to 611,667 liter per year and 466,798.5 liter per
year water for all U.S, European, and Asian kitchen hood designs per hood length. By
adopting the new water-mist recirculation system to the current water-mist kitchen
hood, the water operational cost for water successfully reduced to RM 4,889.63 per
year and RM 6,977.86 per year for U.S design and European or Asian design per
hood length respectively. The water-mist recirculation system has great potential to
improve the current water-mist system for the commercial kitchen hood |
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