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Dive into the research topics where Carlo Giaconia is active.

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Featured researches published by Carlo Giaconia.


Applied Thermal Engineering | 2000

On the reliability of ASHRAE conduction transfer function coefficients of walls

Carlo Giaconia; Aldo Orioli

The transfer function method recommended by the ASHRAE can be considered the most modern tool currently available for the thermal analysis of a building. It is particularly well suited for use with a computer as it makes it possible to describe with great accuracy the internal heat gain of walls using a small set of coefficients. The present paper shows how to calculate sets of coefficients diverse from that proposed by Mitalas who first developed the method and on the basis of an unequivocal criterion, to prove the advantages in using them. The authors also investigated some of the paramount mathematical and physical aspects which affect the approximation degree of the ASHRAE method and, with reference to the optimal number of poles and coefficients, they tried to offer some certainties for a more conscious use of it.


Indoor and Built Environment | 2007

A Survey on the Thermal Conditions Experienced by a Surgical Team

Sante Mazzacane; Carlo Giaconia; Costanzo S; Alessia Cusumano

The complex environment of the operating theatre is shared by a group of people having highly different needs: on one side, there is a surgical team whose work may last many hours and, on the other, an anaesthetized patient often subject to liquid infusion. Up to now, little consideration has been given to the different needs of the surgical team who may be affected according to their positions with respect to the scialytic lamp and their particular task. Clothing influences the comfort of the surgical team to a considerable degree: in fact, in some surgery (orthopaedics, neurosurgery and so on), surgeons and assistants must wear paper overalls beneath non-breathable plastic overalls and protective masks and caps; then, if X-rays are needed during surgery, the second surgeon and the assistants must also wear lead overalls and lead thyroid collars and gloves while the anaesthetists and nurses will keep on wearing non-breathable paper overalls. In consequence, the thermal resistance of the clothing of the surgical staff involved in the same surgical operation could be very different. The purpose of the present work is to report investigations carried out at the SS. Annunziata Hospital in Cento (Ferrara, Italy) and present some of the data obtained. The article describes experimental and theoretical research activities, both ongoing and proposed, inherent to the thermo-hygrometric comfort problems of medical personnel. This study falls within a larger research programme, concerning the microbiological, chemical and physical pollution phenomena and the patients hypothermia problems in an operating theatre.


Solar & Wind Technology | 1988

The ASHRAE clear sky model. An evaluation in the Mediterranean Zone

S. Barbaro; G. Cannistraro; Carlo Giaconia; Aldo Orioli

Abstract The ASHRAE clear sky model in the version proposed by G. L. Powell is here applied to a yearly set of data for Palermo with small scale time intervals. The model is shown to yield computed values generally higher than the measured ones. New values for the atmospheric extinction coefficient are derived and proposed for the application to the Mediterranean atmosphere. A successful verification is performed using hourly data of Genoa, a location belonging to the same meteoclimatic area.


Indoor and Built Environment | 2011

Ventilation Rates and Unsatisfied Percentage from Indoor CO2 Concentration

Costanzo S; Alessia Cusumano; Carlo Giaconia

This work reports the results of a survey carried out on a hall in a historic building in Palermo (Italy) with the aim of assessing the air quality by means of objective measurement of carbon dioxide (CO2) concentration and its subjective evaluation through a questionnaire. The measured values of CO2 concentration were compared with those evaluated using the Meckler equation under steady-state conditions, having verified necessary parameters such as the constancy of the indoor and outdoor CO2 levels and the uniformity of the CO 2 generation rate for all the occupants. The positive correspondence between measured and calculated results allowed us to utilise, under differing circumstances, the values of the natural ventilation rates achieved in steady-state conditions. By using measured and calculated data, an experimental assessment of the relationships between the CO2 concentration levels and the number of occupants and their level of satisfaction was performed. The indoor air quality level in the hall, evaluated by means of the experimental data, was compared with the subjective responses expressed through a specific multiple choice questionnaire handed out to the occupants. A comparison between the calculated ventilation rates and those required by the main American and European standards shows that natural ventilation in the hall is often insufficient according to these standards which have regard for the minimum requirements for air acceptability. In addition, some general observations on the thermal condition of the hall have been drawn from a comparison between microclimate parameters and the subjective opinions provided by the occupants.


BioMed Research International | 2014

A proposed methodology to control body temperature in patients at risk of hypothermia by means of active rewarming systems.

Silvia Costanzo; Alessia Cusumano; Carlo Giaconia; Sante Mazzacane

Hypothermia is a common complication in patients undergoing surgery under general anesthesia. It has been noted that, during the first hour of surgery, the patients internal temperature (T core) decreases by 0.5–1.5°C due to the vasodilatory effect of anesthetic gases, which affect the bodys thermoregulatory system by inhibiting vasoconstriction. Thus a continuous check on patient temperature must be carried out. The currently most used methods to avoid hypothermia are based on passive systems (such as blankets reducing body heat loss) and on active ones (thermal blankets, electric or hot-water mattresses, forced hot air, warming lamps, etc.). Within a broader research upon the environmental conditions, pollution, heat stress, and hypothermia risk in operating theatres, the authors set up an experimental investigation by using a warming blanket chosen from several types on sale. Their aim was to identify times and ways the human body reacts to the heat flowing from the blanket and the blankets effect on the average temperature T skin and, as a consequence, on T core temperature of the patient. The here proposed methodology could allow surgeons to fix in advance the thermal power to supply through a warming blanket for reaching, in a prescribed time, the desired body temperature starting from a given state of hypothermia.


Solar & Wind Technology | 1989

An analysis of direct solar transmittance and atmospheric turbidity in the Mediterranean climatic belt

S. Barbaro; G. Cannistraro; Carlo Giaconia; Aldo Orioli; S. Trapani

Abstract The empirical model developed by King and Buckius for the direct transmission in clear sky is applied to hourly data of two Yugoslav locations exhibiting typical meteoclimatic characteristics common to the whole Mediterranean belt. The occurrence of “very clear”, “clear” and “very hazy” hours, after the usually accepted definitions, is determined and discussed. The degree of accuracy of the previsional model is investigated performing the comparison with the corresponding values obtained directly by energetic procedure. A general overestimate of the transmittance is experienced with notable deviations in meteorological conditions affected by the presence of dense clouds which behave as screens to the direct solar beam and which indeed the model neglects. Better results have been obtained testing the methodology by reduced samples, i.e. excluding hourly data with high experimental values of the ratio diffuse/global radiation, or adopting average daily values.


Building and Environment | 1986

Analysis of the accuracy in modelling of transient heat conduction in plane slabs

S. Barbaro; Carlo Giaconia; Aldo Orioli

Abstract The accuracy achieved by modelling unidimensional, thermal conduction using lumped representation is assessed. The transient responses of one surface of a plane, infinite, homogeneous slab when the other surface is subjected to unit step or linear ramp excitations of temperature or heat flux are analysed. The results are expressed in dimensionless form and are compared as a function of the Fourier variable. The lumping errors are assessed by the calculation of the percentage error. Graphs collecting the possible pairs m.β by which a prefixed percentage error is found are shown and discussed.


Building and Environment | 1988

A computer oriented method for the analysis of non steady state thermal behaviour of buildings

S. Barbaro; Carlo Giaconia; Aldo Orioli

Abstract A method for the analysis of non steady thermal behaviour of buildings, based on the Laplaces transform, is proposed. The study is performed in a general way attaining the expressions of the solutions in a synthetic form by using matrix analysis. It is verified that the generic unknown quantity, expressed as a ratio of determinants, satisfies the conditions of inverse Laplace transform so that the theorem of residue can be applied. A procedure for finding the thermal responses time variation, well suited to personal computer implementation, is identified, which does not require the analytical development of the system of equations describing the thermal balances. This method, here applied to a thermal structure assuming constant values for the involved parameters, shows distinctive features and appears to be a viable alternative to other more popular techniques.


Solar & Wind Technology | 1989

A more reliable relation between Angström and Linke atmospheric turbidity parameters

S. Alterio; S. Barbaro; G. Cannistraro; Carlo Giaconia; Aldo Orioli; S. Trapani

Abstract This work analyses the correlation between Angstrom and Linke atmospheric turbidity parameters (β and T ) which are commonly used in studies about the atmospheres behaviour since they efficaciously monitor a point turbidity state and model the aerosol attenuation of solar radiation. Starting from the usual linear relation β = a + bT , a more reliable one is here derived by hourly data of three coastal locations with typical Mediterranean meteoclimatic characteristics, for values of the experimental ratios of diffuse and global solar radiation ⩽0.3. The expression found notably differs from the starting one as shown by the time variable.


Building and Environment | 2013

Air quality and relative humidity in commercial aircrafts: An experimental investigation on short-haul domestic flights

Carlo Giaconia; Aldo Orioli; Alessandra Di Gangi

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