A study of water-mist recirculation system for filtration and cooling effect in the kitchen hood ventilation system

Nor Salim, Nor Adrian (2020) A study of water-mist recirculation system for filtration and cooling effect in the kitchen hood ventilation system. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.


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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

Item Type: Thesis (Doctoral)
Subjects: T Technology > T Technology (General)
T Technology > TH Building construction > TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Mechanical Engineering
Depositing User: Mrs. Sabarina Che Mat
Date Deposited: 03 Feb 2022 02:39
Last Modified: 03 Feb 2022 02:39
URI: http://eprints.uthm.edu.my/id/eprint/4138

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