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Incorporation of Natural Ventilation in a Commercial HVAC System Using Temperature as a Comfort Parameter

PENDSE, RAHUL S
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1083031216

Abstract Details

2004, Master of Science in Civil Engineering, University of Toledo, Civil Engineering.
Researchers are assessing the possibility of using natural ventilation for a certain period of day the to reduce the energy consumption due to HVAC systems. There is a need to develop hybrid systems involving both conventional HVAC systems and natural ventilation as a viable solution to energy consumption issues. This thesis is an effort to develop a hybrid HVAC system with natural night ventilation serving as an energy efficient component of the system. This research is targeted for commercial buildings, especially a manufacturing plant (e.g. metal fabricator plant) and a small office located at the plant. Night cooling times are calculated on a monthly basis for both the manufacturing plant as well as for the office separately. The first step is the development of a model for the calculation of indoor temperature after night cooling. This is done with the aim of using internal room temperature as a comfort index for the occupants. Accordingly, the models are developed for calculating final indoor temperature by incorporating the heat gains and losses observed in a plant as well as in an office building unit separately. The effect of changes in moisture content on indoor temperature at designed relative humidity has been taken into consideration. It is also assumed that the designed relative humidity is remaining constant throughout the cooling period. Both of the models involve a complex equation for the calculation of final indoor temperature, which makes the process time-consuming. To facilitate the calculations, a spreadsheet tool used is composed of five sheets, wherein inputs concerning wall details, window details, lighting details, motor details, heat emitted during different activities by human beings, and outdoor temperature calculations are obtained from the ASHRAE Handbook of Fundamentals 2001; moisture contents at different temperatures at designed relative humidity are obtained from Mark’s Handbook for Mechanical Engineers. Variation of the temperature with respect to internal mass, air change rate, start time, change in relative humidity, duration, and change in load and shifts is studied for five cities, each belonging to one of the five climatic zones into which the United States is divided by the Department of Energy. Based on the pattern of the variation of indoor temperature and comfort ranges of indoor temperature developed from an ASHRAE study, recommendations are made for night cooling in the cities on a monthly basis. The recommendations are made in two sets, one conservative set assuming a low tolerance for temperature fluctuation and a liberal set of recommendations for building occupants having higher degree of adaptability to varying indoor temperatures. In warm regions like Texas, night cooling can be carried out for almost all months of the year. In a city like Raleigh, NC, it is possible to reduce usage of conventional systems in a manufacturing plant by approximately 1500 hours per year and for an office building by approximately 1400 hours per year. In a comparatively colder city like Minnesota, MN, it is possible to reduce usage of conventional systems in a manufacturing plant by approximately 1300 hours per year and for an office building by approximately 1200 hours per year.
Ashok Kumar (Advisor)
170 p.
Engineering, Environmental
natural ventilation; night time cooling

Recommended Citations

Citations

  • PENDSE, R. S. (2004). Incorporation of Natural Ventilation in a Commercial HVAC System Using Temperature as a Comfort Parameter [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1083031216

    APA Style (7th edition)

  • PENDSE, RAHUL. Incorporation of Natural Ventilation in a Commercial HVAC System Using Temperature as a Comfort Parameter. 2004. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1083031216.

    MLA Style (8th edition)

  • PENDSE, RAHUL. "Incorporation of Natural Ventilation in a Commercial HVAC System Using Temperature as a Comfort Parameter." Master's thesis, University of Toledo, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1083031216

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Toledo and OhioLINK.