A screening methodology for climatic evaluation of the cooling potential of night ventilation in buildings

Akhilesh Reddy Endurthy, T Agami Reddy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Night ventilation is a well known strategy for passive cooling of residences and small commercial buildings. The building's thermal mass can be cooled at night by ventilating the inside of the space with the relatively lower outdoor air temperatures, thereby lowering indoor temperatures during the warmer daytime period. Numerous experimental and theoretical studies have shown the effectiveness of the method to significantly reduce air conditioning loads or improve comfort levels in those climates where the night time ambient air temperature drops below that of the indoor air. One could develop/adapt computer programs with detailed mathematical component models to simulate and evaluate the performance of night ventilation strategies in a specific location for a particular building. A more basic problem is to develop a methodology whereby potential designers can screen various climatic locations and regions in order to perform a preliminary evaluation of which months of the year are good candidates for implementing such a scheme. Only after completion of such a phase is a detailed evaluation warranted for specific buildings. In this paper, effectiveness of night ventilation is quantified by a parameter called the Discomfort Reduction Factor (DRF) which is the index of reduction of occupant discomfort levels during the day time from night ventilation. Two different thermal network models which provide such insights are evaluated. Daily and monthly DRFs are calculated for two climate zones and three building heat capacities for the whole year. It is verified that night ventilation is effective in seasons and regions when day temperatures are between 30°C and 36°C and night temperatures are below 20°C. The accuracy of these preliminary screening models may be lower than using a detailed simulation program but the loss in accuracy in using such tools is more than compensated by the insights provided, along with better transparency in the analysis approach and results obtained.

Original languageEnglish (US)
Title of host publicationASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
PublisherAmerican Society of Mechanical Engineers
Pages17-26
Number of pages10
EditionPARTS A AND B
DOIs
StatePublished - 2012
EventASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology - San Diego, CA, United States
Duration: Jul 23 2012Jul 26 2012

Other

OtherASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
CountryUnited States
CitySan Diego, CA
Period7/23/127/26/12

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Endurthy, A. R., & Reddy, T. A. (2012). A screening methodology for climatic evaluation of the cooling potential of night ventilation in buildings. In ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology (PARTS A AND B ed., pp. 17-26). American Society of Mechanical Engineers. https://doi.org/10.1115/ES2012-91032