A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluating and adapting low exergy systems with decentralized ventilation for tropical climates
Highlights Exergy concept can be used to create an innovative cooling and ventilation system in the tropics. The experimental results show that units will achieve low enough humidity ratio level. Results based on the mathematical model show condensation risk can be avoided. The humidity ratio of air supplied from the decentralized units has to be kept below 13g/kg.
Abstract The use of low exergy high temperature radiant cooling in the tropics is only possible with adequate dehumidification. We analyze the adaption of a decentralized ventilation system to supply dehumidified air using models and experimental prototypes. The decentralized air supply prototype was developed and initially tested at the ETH Zurich, then installed in a building laboratory that was shipped to Singapore-ETH Centre, and it was modeled and evaluated in collaboration with the National University of Singapore. We present the findings on its performance and ability to mitigate the risk of condensation for high performance radiant cooling surfaces for buildings in the tropics from models and experiments. We show that adequate dehumidification can be achieved in the decentralized supply unit by our expanded cooling coil. Our model shows that when the supply air has a humidity ratio of 13g/kg then sufficient mitigation of condensation on the chilled panels is achieved. Experiments in the laboratory showed supply air down to 11g/kg, which should be sufficient, but also showed the potentially large impact of infiltration of humid outdoor air in the tropics because humidity in the space remained higher than expected, and was also very sensitive to infiltration in our models.
Evaluating and adapting low exergy systems with decentralized ventilation for tropical climates
Highlights Exergy concept can be used to create an innovative cooling and ventilation system in the tropics. The experimental results show that units will achieve low enough humidity ratio level. Results based on the mathematical model show condensation risk can be avoided. The humidity ratio of air supplied from the decentralized units has to be kept below 13g/kg.
Abstract The use of low exergy high temperature radiant cooling in the tropics is only possible with adequate dehumidification. We analyze the adaption of a decentralized ventilation system to supply dehumidified air using models and experimental prototypes. The decentralized air supply prototype was developed and initially tested at the ETH Zurich, then installed in a building laboratory that was shipped to Singapore-ETH Centre, and it was modeled and evaluated in collaboration with the National University of Singapore. We present the findings on its performance and ability to mitigate the risk of condensation for high performance radiant cooling surfaces for buildings in the tropics from models and experiments. We show that adequate dehumidification can be achieved in the decentralized supply unit by our expanded cooling coil. Our model shows that when the supply air has a humidity ratio of 13g/kg then sufficient mitigation of condensation on the chilled panels is achieved. Experiments in the laboratory showed supply air down to 11g/kg, which should be sufficient, but also showed the potentially large impact of infiltration of humid outdoor air in the tropics because humidity in the space remained higher than expected, and was also very sensitive to infiltration in our models.
Evaluating and adapting low exergy systems with decentralized ventilation for tropical climates
Meggers, Forrest (author) / Pantelic, Jovan (author) / Baldini, Luca (author) / Saber, Esmail M. (author) / Kim, Moon Keun (author)
Energy and Buildings ; 67 ; 559-567
2013-08-09
9 pages
Article (Journal)
Electronic Resource
English
Evaluating and adapting low exergy systems with decentralized ventilation for tropical climates
| Online Contents | 2013
| TIBKAT | 1960