Papers by Alessandro Franco
Optimal sizing of an integrated energy system for a nearly zero-energy residential building
Journal of physics, Apr 1, 2021
The paper analyzes the design of a typical solution for a smart energy system. It examines a part... more The paper analyzes the design of a typical solution for a smart energy system. It examines a particular plant, evaluating the integration of a Photovoltaic (PV) system and a Ground-Source Heat Pump (GSHP) for residential building service. The idea is to develop a system that maximizes self-consumption of the renewable energy generated by a small-sized solar array installed on the building. The case is analyzed starting from the results of a long-term experimental analysis of a real plant in Pisa. The analysis concerns the energy balance of the system during a year with a special attention on the operation of the two different systems, PV array and GSHP. Some indications on the possible optimum design of this solution are proposed and discussed and analyzed.
Energy, Mar 1, 2004
Please cite this article as: M. Nadir, A. Ghenaiet, C. Carcasci, Thermo-economic optimization of ... more Please cite this article as: M. Nadir, A. Ghenaiet, C. Carcasci, Thermo-economic optimization of heat recovery steam generator for a range of gas turbine exhaust temperatures, Applied Thermal Engineering (2016),
HVAC Systems Operation Control Based on Indirect Occupant-Centric Method for Ensuring Safety Conditions and Reducing Energy Use in Public Buildings after Covid-19
Social Science Research Network, 2023
HVAC Systems Control Based on CO2 Monitoring for Reducing Energy Use for Ventilation in Public Buildings After COVID-19 Pandemic
Energy efficiency in shared buildings: Quantification of the potential at multiple scales
Energy Reports, Dec 1, 2023
A method for optimal operation of HVAC with heat pumps for reducing the energy demand of large-scale non residential buildings
Journal of building engineering, Nov 1, 2021
Abstract One of the key elements for improving the energy performance of large-scale non-resident... more Abstract One of the key elements for improving the energy performance of large-scale non-residential buildings is recognized as the correct management and control of the Heating Ventilation and Air Conditioning (HVAC) system. In real applications, the main shortcomings are represented by the lack of involving occupants presence and behavior, and by the lack of application of dynamic control able to guarantee optimality of operation with the aim of controlling building energy demand. This present study aims at evaluating the perspective of energy savings achievable with the broadening of the energy perspective to indoor air quality thanks to occupants’ monitoring and at showing some of the potentialities arising from the implementation of an optimal control of the HVAC . This provides insights about the possibility of achieving significant energy savings by using measures of minimal complexity. The proposed measures involve demand-controlled ventilation as representative of occupant-centric control strategies, and an improved control of the heat pump and chiller supply water temperature, and of heat recovery equipment as representative of supervisory control strategies. The analysis which is carried out by means of dynamic simulation has been applied to an academic building situated in Pisa. The achieved energy saving can reach the value of 44%, a significant part (33%) of which is guaranteed by the application of demand-controlled ventilation, consequent to a direct monitoring of the presence inside the building. This shows the major importance of implementing occupant-centric control strategies, which will also return useful in the new paradigm of building occupation after COVID-19 pandemic experience.
Experimental Thermal and Fluid Science, Feb 1, 2017
This paper deals with the experimental analysis and numerical simulation of a two-phase closed th... more This paper deals with the experimental analysis and numerical simulation of a two-phase closed thermosyphon (TPCT) in the aim to predict its transient performances. A concern in the design and operation of the TPCT is evaluating working fluid loading charge to maximize performance while avoiding dryout in the evaporator section and geyser boiling phenomena. The model includes the heat transfer through the wall, the vapor core, the liquid pool and the falling condensate film. The complete two-dimensional conservation equations for mass, momentum, and energy are solved using a finite volume scheme for the vapor flow and the pipe wall. The liquid film is modeled by using one-dimensional quasi-steady Nusselt type solution. An experimental facility has been also designed and operated to determine the operating condition and measure the maximum heat transfer rate and the overall thermal resistance of the TPCT. The total length and the diameter of pipe are 500 mm and 35 mm, respectively. The experiments have been performed in the heat transfer range of 30-700 W and filling ratios of 16, 35 and 135%. The numerical predictions for the maximum heat transport rate due to the transient local dryout are shown to be in close agreement with the experimental results under normal operation. However, for obtained liquid film dryout a discrepancy is observed. The geyser boiling is also evaluated under certain operating condition.
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Papers by Alessandro Franco