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2 results on '"Diglio, G."'

1. A novel energy index to assess the impact of a solar PV-based ground source heat pump on the power grid.

Author

Roselli, C., Diglio, G., Sasso, M., and Tariello, F.

Subjects
*GROUND source heat pump systems, *ELECTRIC power distribution grids, *ENVIRONMENTAL impact analysis, *GAS as fuel, *CARBON dioxide reduction, *SOLAR thermal energy
Abstract

A novel energy index to assess plants capable of producing electricity from a renewable source is introduced in this paper. This index allows to evaluate the bidirectional energy flows on the external power grid, due the electricity exported to the grid from a renewable-based system and the electricity imported from the grid, in comparison to the electricity demand of a building. In this paper, attention is focused on a solar photovoltaic (PV) system satisfying the energy demands of an office building. Electricity from the solar PV system is partly used to operate a ground source heat pump to meet space heating and cooling demands, and partly used for other electrical loads. An energy, economic and environmental impact analysis of the proposed system is also reported. A sensitivity analysis varying the photovoltaic system capacity (2.5–10.0 kW) and the battery storage size (3.2–9.6 kWh) is also carried out. A saving in terms of primary energy and a carbon dioxide emission reduction can be obtained by a renewable-based system compared to a conventional one consisting of a natural gas fuelled boiler for space heating, an electric chiller for space cooling and the national power grid for electricity demand. • Dynamic simulation by means of TRNSYS of a PV-GSHP-based system. • Thermo-economic analysis of PV-GSHP-based system for an office application. • Increase the on-site use of PV generation limits the impact on the electrical grid. • Share of renewables on office building load can reduce national fossil-fuel demand. • Introduction of a novel energy index to assess the impact of renewables in electricity sector. [ABSTRACT FROM AUTHOR]

Published
2019
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2. Design of a novel geothermal heating and cooling system: Energy and economic analysis

Author

Giuseppe Diglio, Francesco Calise, M. Dentice d’Accadia, Maurizio Sasso, Giovanni Angrisani, Angrisani, G., Diglio, G, Sasso, M., Calise, Francesco, and DENTICE D'ACCADIA, Massimo

Subjects
Desiccant cooling, Renewable energy, Engineering, Renewable Energy, Sustainability and the Environment, business.industry, 020209 energy, Geothermal heating, Geothermal energy, Environmental engineering, Energy Engineering and Power Technology, 02 engineering and technology, TRNSYS, Energy performance, Absorption chiller, Downhole heat exchanger, Fuel Technology, Nuclear Energy and Engineering, Chilled water, 0202 electrical engineering, electronic engineering, information engineering, Water cooling, business, Dynamic simulation, Geothermal gradient
Abstract

A dynamic simulation study in TRNSYS environment has been carried out to evaluate energy and economic performance of a novel heating and cooling system based on the coupling between a low or medium-enthalpy geothermal source and an Air Handling Unit, including a Desiccant Wheel. During summer season, a Downhole Heat Exchanger supplies heat to regenerate the desiccant material, while a certain amount of geothermal fluid is continuously extracted by the well in order to maintain high operating temperatures. Simultaneously, the extracted geothermal fluid drives an absorption chiller, producing chilled water to the cooling coil of the Air Handling Unit. Conversely, during the winter season, geothermal energy is used to cover a certain amount of the space heating demand. In both summer and winter operation modes, a geothermal energy is also used to supply Domestic Hot Water. A case study was analyzed, in which an existing low-enthalpy geothermal well (96 °C), located in Ischia (an island close to Naples, Southern Italy), is used to drive the geothermal system. Results showed that the performance of the proposed system is significantly affected by the utilization factor of Domestic Hot Water. In fact, considering a range of variation of such parameter between 5% and 100%, Primary Energy Saving increase from 77% to 95% and Pay-Back Period decreases from 14 years to 1.2 years, respectively. The simulations proved the technical and economic viability of the proposed system. In fact, a comparison with similar systems available in literature pointed out that the layout proposed in this work is characterized by better energy and economic performance, especially in the best scenario. Finally, a sensitivity analysis showed that the system performance is mainly affected by the nominal geothermal flow rate and by natural gas cost.

Published
2016

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