1,720,994 research outputs found
Thermal comfort in the climatic conditions of Southern Italy
No full textThis paper presents the results of four thermal comfort surveys conducted in naturally ventilated and air-conditioned buildings located in Bari, in southern Italy, during winter and
summer seasons. The buildings were of different types, including offices, lecture rooms, and library reading rooms. The sample of subjects consisted mostly of students. A total of 20 rooms were analyzed by measuring indoor climatic parameters.
During the measurements, the subjects located near the probes were asked to fill in a questionnaire to rate the thermal environment at that moment. A total of 1840 valid questionnaires were collected during the four surveys. Clothing insulation levels were 0.45 clo in summer and 0.90 clo in winter.
Metabolic rate was assumed equal to 1.2 met. Thermal neutrality, according to the ASHRAE seven-point scale, occurred at 24.4°C and 26.3°C in summer and at 20.7°C and 20.6°C in winter, respectively in naturally ventilated (NV) and air-conditioned (AC) buildings. Preferred temperature, based on the
McIntyre preference scale, was cooler in summer (24.2°C and 25.6°C in NV and AC buildings, respectively) and warmer in winter (23.1°C and 21.2°C in NV and AC buildings, respectively).
Thermal acceptability was investigated by means of all
the available scales, showing that the indirect estimation of acceptability (based on the three central categories of the ASHRAE scale) only provides partial information about occupants’conditions. Finally, the whole set of data was analyzed in order to propose an adaptive algorithm for this climatic zone.
The resulting equation (Tc = 17.82 + 0.315 Trm), where Tc is the comfort temperature and Trm is the running mean outdoor air temperature, proved to be in good agreement with other
studies
Gli impianti fotovoltaici: uno studio sperimentale
No full textA photovoltaic unit, designed at the University of Bari and already in operation, is described as well as the methodology followed to measure the main characteristic parameters of its operation. The experimental results, compared with those obtained by applying semi-empirical calculations, suggest that load intermittance should be taken into account by introducing a parameter N in the calculation, and that intervention of the solar section control device should be considered
Preventive Conservation of Heritage Building: The Case Study of Palazzo Gioia in Corato (Italy)
No full text
A new approach to assessing the performance of noise indices in buildings
No full textThe results of a wide acoustic environment survey are presented. Sound pressure measurements were carried out in a group of offices. These measurements lasted for five minutes and the resulting noise spectra were used to calculate the most significant acoustic parameters. During each measurement a questionnaire was administered to workers near each measuring position. The questionnaire asked them to indicate their subjective judgement about noise annoyance, noise loudness and dissatisfaction induced by noise present in the environment. The aim of the research was to investigate the performance of the measured noise indices in describing subjective responses to noise. A new method to calculate the average subjective responses is proposed. The performance of the noise indices was studied by means of linear regression analysis. Finally-the A-weighted equivalent sound pressure level proved to be the best index among those analysed in describing subjective auditory sensations
- …
