Title

NZE Residential Test Facility Analysis throughout Summer/Winter Peak Months for Thermal Comfort Prediction

Location

Presentation- Allen E. Paulson College of Engineering and Computing

Document Type and Release Option

Thesis Presentation (Restricted to Georgia Southern)

Faculty Mentor

Marcel Maghiar

Faculty Mentor Email

mmaghiar@georgiasouthern.edu

Presentation Year

2021

Start Date

26-4-2021 12:00 AM

End Date

30-4-2021 12:00 AM

Keywords

Thermal comfort prediction, temperature, humidity, setpoint, prediction calculations

Description

The present study evaluates the thermal comfort in the east bedroom of the Net-Zero Energy Residential Test Facility (NZERTF) in a mixed-humid climate. This unit was constructed by the National Institute of Standards and Technology for scholars to develop its energy performance and indoor environmental quality. The thermal comfort is investigated by analyzing 27 dry-bulb temperature, 4 airspeed, 6 globe temperature, and 6 relative humidity sensors in a 3x3x3 array and a center sensor stand during two opposite seasonal months (July and December). The conventional ducted heat pump, small duct high velocity, and heat recovery ventilation systems are operated intermittently based on a temperature setpoint interval. A laptop and "Child B" are simulated with 1.2 and 1.7 metabolic rates (met) and seasonally different clothing ranges (clo). Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) are calculated based on the ASHRAE standard 55-2017. PMV with higher clo and 1.2 met resulted within the ± 0.5 thermal comfort zone during both months. Simulations with the higher clo (0.57 and 1.14 clo) and higher met expectedly provided slightly higher PPD than 10% limit, which corresponds to the thermal comfort zone. However, for the simulated occupant with 1.7 met, 84.1% and 92.9% of the daily time on July and respectively December are within the limit of 20%, known as local thermal comfort limit. Based on the prediction calculations, the thermal comfort in the respective NZERTF space during these months is determined to be habitually satisfying.

Academic Unit

Allen E. Paulson College of Engineering and Computing

This document is currently not available here.

Share

COinS
 
Apr 26th, 12:00 AM Apr 30th, 12:00 AM

NZE Residential Test Facility Analysis throughout Summer/Winter Peak Months for Thermal Comfort Prediction

Presentation- Allen E. Paulson College of Engineering and Computing

The present study evaluates the thermal comfort in the east bedroom of the Net-Zero Energy Residential Test Facility (NZERTF) in a mixed-humid climate. This unit was constructed by the National Institute of Standards and Technology for scholars to develop its energy performance and indoor environmental quality. The thermal comfort is investigated by analyzing 27 dry-bulb temperature, 4 airspeed, 6 globe temperature, and 6 relative humidity sensors in a 3x3x3 array and a center sensor stand during two opposite seasonal months (July and December). The conventional ducted heat pump, small duct high velocity, and heat recovery ventilation systems are operated intermittently based on a temperature setpoint interval. A laptop and "Child B" are simulated with 1.2 and 1.7 metabolic rates (met) and seasonally different clothing ranges (clo). Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) are calculated based on the ASHRAE standard 55-2017. PMV with higher clo and 1.2 met resulted within the ± 0.5 thermal comfort zone during both months. Simulations with the higher clo (0.57 and 1.14 clo) and higher met expectedly provided slightly higher PPD than 10% limit, which corresponds to the thermal comfort zone. However, for the simulated occupant with 1.7 met, 84.1% and 92.9% of the daily time on July and respectively December are within the limit of 20%, known as local thermal comfort limit. Based on the prediction calculations, the thermal comfort in the respective NZERTF space during these months is determined to be habitually satisfying.