1,721,026 research outputs found
Indagine sperimentale sul comfort termico introdotto da un particolare sistema di riscaldamento
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Experimental evaluation of the performances of a H20LiBr absorption refrigerator under different service conditions
No full textThe paper describes an experimental plant aimed at simulating and verifying the performances of a single-stage H2O–LiBr absorption machine. The machine is water cooled and it is supplied by hot water produced by an electrical boiler; it is possible to simulate different service conditions by varying the temperatures and the flow rate of water in the external circuits. Measurement facilities allow to record in real time all the main operating parameters of internal and external circuits (temperatures, pressures and flow rates). The paper illustrates the characteristics of the machine and of the plant and the results of various experimental campaigns. In particular, the acquisitions on the plant have tested different service conditions by varying the flow rate and the temperature of the supplying hot water; the energy and energy performances of the plant are presented and compared with data from literature and from a simulation code developed for the plant.
The results show that the absorption machine can work, with acceptable efficiency, with input temperatures of about 65–70 °C; this result is interesting for a future supply of the machine with solar energy
Comparative Analysis of Different Methods to Evaluate the Thermal Conductivity of Homogeneous Materials
No full textThermal conductivity of materials for structural elements and thermal insulation represents a fundamental parameter in the assessment of the energy need of buildings. In this paper, two different systems for thermal conductivity measurement are compared, based respectively on the calibrated hot box and on the guarded hot plate methods. The study is specifically aimed at assessing the range of thermal transmittance where the hot box system is suitable and verifying the strengths and the weaknesses of the system.The comparison between measurements on specimens with different thermal conductivity and thickness showed that the two methods are substantially equivalent in the considered range of thermal conductivity, but are not completely interchangeable. In particular, the measurement campaign confirmed the expectation that the hot box system gives more accurate results with low thermal resistance samples
Validazione sperimentale di un codice di calcolo delle prestazioni illuminotecniche di coperture a shed
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Innovative aspects in noise mapping and dissemination activities within LIFE+ "NADIA" project
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