Roberto Capata

Roberto Capata
Sapienza University of Rome | la sapienza · Department of Mechanical and Aerospace Engineering

Ph.D

About

85
Publications
76,806
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660
Citations
Introduction
Roberto Capata currently works at the Department of Mechanical and Aerospace Engineering, Sapienza University of Rome. Roberto does research in Mechanical Engineering and Industrial Engineering. Their current project is 'CAES system'. ORC systems Ultra Micro Gas Turbine and Hybrid Vehicles
Additional affiliations
January 2003 - September 2020
Sapienza University of Rome
Position
  • Senior Researcher
Description
  • Macchine Operatrici Idrauliche e Pneumatiche (Magistrale Meccanica); Diagnostica delle Macchine (Magistrale Energetica);; Macchine (Triennale Clinica & Biomedica); Turbomacchine (Magistrale Meccanica); Biomacchine (Magistrale Biomedica);
January 2001 - present
Sapienza University of Rome
Education
September 1996 - October 1999
Sapienza University of Rome
Field of study
  • Advanced Energy Systems
September 1988 - October 1994
Sapienza University of Rome
Field of study
  • Mechanical Engineering

Publications

Publications (85)
Article
Full-text available
The aim of this work was to develop the design of a direct liquid cooling system for a battery pack of a high-performance plug-in hybrid vehicle. The cooling system of the battery pack is of an innovative type, with the direct cooling of the power busbars and the poles of the lithium cells. In order to obtain preliminary information for the dimensi...
Article
Full-text available
The present work aims to provide a technical, economic, and environmental analysis on the electric accumulators used for electric mobility (pure electric, hybrid, full hybrid and/or mild hybrid) to reduce the environmental, social and economic impacts generated by private vehicles. Initially, the scenarios for the development of electric mobility a...
Article
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As part of a project for the realization of a hybrid vehicle with an innovative power train system, the proposal presented is to disconnect the turbocharger group and study the different behavior of the compressor and turbine, so decoupled. In an actual turbocharger, when the power ofthe turbine exceeds that required by the compressor, the wastegat...
Article
Full-text available
In this study, an ORC plant is considered that recovers the heat source from 1800 cc Diesel Engine exhaust gases. The power recovered by the ORC system could be used, as an auxiliary system, to provide energy to the electronic parts of the car. The purpose of this study is to investigate the possibility of allocating this ORC plant into a vehicle a...
Article
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This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car internal combustion engine ICE (900 cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine devic...
Article
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Within a large, state-funded, Italian National Project aimed to test the feasibility of an on-the-road prototype of a mild hybrid city vehicle, one of the tasks was to conceive, design and implement an innovative turbocharger that would allow for some energy recovery. The selected vehicle is propelled by a 3-cylinder, 998 cc turbocharged engine (th...
Conference Paper
Full-text available
This work aims to analyze the various types of peristaltic pumps by studying, in particular, the use of the peristaltic roller pump to highlight its critical issues and propose new effective and innovative solutions. One possible application of this device is in hemodialysis, which is a physical therapy substitution of kidney function that allows,...
Article
Full-text available
This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car ICE (900cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation o...
Book
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Article
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Hybrid vehicles currently represent a compromise between the maturity of conventional vehicles and the low consumption and attention to environmental issues of electric vehicles. This article analyzes the feasibility of a hybrid series vehicle where the heat engine is replaced by a micro gas turbine. In the continuous generation of electric current...
Conference Paper
Full-text available
ORC systems are the most used system for heat recovery. The considerable impetus they have had in recent years has led to new configurations and the choice of different types of plant layouts and components. And one of the key components is the expander, and consequently all the study that leads to the definition of such a machine. The topic of thi...
Article
Full-text available
The particular aspect of this work is the new approach to expander design procedure for small rated ORC. In fact, once all the calculation procedures have been defined, they have been implemented in Matlab code. This code, once the design process is complete, provides an indication of the optimal expander configuration to adopting to that specific...
Conference Paper
Full-text available
The aim of this work the analysis of compact branched heat exchangers, by measuring thermal efficiency and the pressure drop in several experimental tests. Three different heat exchanger configuration have been considered. In the first device, the constant efflux velocity, in the internal channels, was imposed. The second exchanger was realized by...
Article
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The aim of this work is to continue the experimental evaluation of three different compact branched heat exchangers. To complete the previous study, additional experimental tests were carried out, using a commercial automotive refrigerant (Glycol) at different concentrations (50%, 100%). Finally, in order to have a deeper knowledge of this phenomen...
Article
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Modern metropolises are increasingly affected by air quality problems. Transportation is one of the largest sources of several pollutants emissions, such as nitrogen oxides (NOx) and carbon monoxide (CO). Today in the EU, vehicles’ emissions are strictly limited by Euro 6 norm—Euro VI for heavy-duty vehicles—which is periodically upgraded. To match...
Article
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Pollution derived from transportation systems is a worldwide, timelier issue than ever. The abatement actions of harmful substances in the air are on the agenda and they are necessary today to safeguard our welfare and that of the planet. Environmental pollution in large cities is approximately 20% due to the transportation system. In addition, pri...
Article
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The increasing demand for miniaturized radio-controlled vehicles inspired the following research. The uses of these unmanned miniaturized/micro vehicles range from aero-modeling to drones for urban control and military applications too. The common characteristic of these vehicles is the need for a light and compact propulsion system. The radio-cont...
Article
The aim of this work is to experimentally evaluate three different compact branched heat exchangers, measuring, for every single device, the thermal efficiency and the pressure drop. The generality of the analysis of phenomena is enhanced by a comparison of the performance of different refrigerant fluids. In the first configuration, the channels ha...
Conference Paper
Full-text available
This paper deals with the comparison between an IFR microturbine and a scroll-type expander for the exploitation of an on board ORC energy recovery system. The sensible heat recovered from a common bus engine (typically 8000cc) feeds the energy recovery system that can generate sufficient extra power to sustain the airconditioning system and part o...
Article
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This paper deals with the comparison between volumetric expanders (screw, scroll and rotary vane) and an Inlet Forward Radial (IFR) micro turbine for the exploitation of an on board Organic Rankine Cycle (ORC) energy recovery system. The sensible heat recovered from a common bus engine (typically 8000 cc) feeds the energy recovery system that can g...
Conference Paper
Full-text available
The aim of this work is to experimentally evaluate three different compact branched heat exchangers, measuring the thermal efficiency and the pressure drop of every single device, using three different refrigerant fluids and three different configurations. In the first configuration, the ducts have been designed and realized whit an inner variation...
Conference Paper
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Due to the fast development of technology, there is an increasing need in the Turbomachinery industry for high-performance machines, which require new metal alloys in order for each component to be both strong and lightweight. This would mean faster rotation, with excellent resistance to creep and stress at high speed. Therefore, the aim of the pre...
Conference Paper
Full-text available
This work analyses the feasibility of an on-board ORC energy recovery system for vehicular application. The sensible heat recovered from a common bus engine (typically 8000cc) feeds the energy recovery system that can generate sufficient extra power to sustain the airconditioning system and part of the auxiliaries. The concept is suitable for all k...
Conference Paper
Full-text available
Environmental pollution in large cities is approximately 20% due to the transportation system. At same time the “vehicle operating life” are most often overcome and the vehicles emissions do not comply the European anti-pollution standards. It becomes mandatory to find a solution that respects the environment and can provide the appropriate service...
Article
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The aim of the work described in this paper was to design a lightweight, creep resistant blade for an axial single-stage micro gas turbine. The selected process was the casting of an intermetallic Titanium/Aluminum alloy. All project phases are described, from the preliminary thermodynamic and geometric stage design, to its three-dimensional (3D) m...
Article
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The aim of this paper is the feasibility study of a micro-hydroelectric (Pelton turbine with a rated power lower than 50 kW) and a Photovoltaic plant integrated in a sixty floor skyscraper. In this proposal, the hydraulic plant is located in the foundation and it is designed to use the greywater from each apartment; the photovoltaic system is on th...
Article
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The reliability of gas path components (compressor, burners and turbines) of a gas turbine is generally high, when compared with those of other systems. However, in case of forced stops, downtime is usually high, with a relatively low availability. The purpose of conditions monitoring and faults diagnostics is to detect, isolate and evaluate (i.e.,...
Article
Full-text available
The reliability of gas path components (compressor, burners and turbines) of a gas turbine is generally high, when compared with those of other systems. However, in case of forced stops, downtime is usually high, with a relatively low availability. The purpose of condition monitoring and fault diagnostics is to detect, isolate and evaluate (i.e., t...
Article
Full-text available
This paper presents the implementation of an hybrid series Bus with a gas turbine, as thermal engine. The hybridization methodology for transforming city buses, substituting the original gasoline/diesel engine with a micro gas turbine device (intended as range extender), into a series hybrid vehicle has investigated and its feasibility analyzed. Th...
Article
Full-text available
n this article, an analytical method is evaluated and implemented; to assess the possible electricity sales strate-gies produced by a 3 MW photovoltaic power plant, connected to a 250 kW CAES (Compressed Air Energy Storage) system, with a storage capacity of 750 kWh. The presented model combines a different numbers of parameters and variables, rele...
Conference Paper
Full-text available
The aim of the present work is to analyze from an environmental and technical-economical point of view a biogas plant coupled to a stripping column capable of ensuring a high level of nitrates contained in the digested substrate. Such a condition would allow a better use of heat from cogeneration; this heat is often unused or partially used due to...
Conference Paper
Full-text available
In this article, an analytical method is evaluated and implemented; to assess the possible electricity sales strategies produced by a 3 MW photovoltaic power plant, connected to a 250 kW CAES (Compressed Air Energy Storage) system, with a storage capacity of 750 kWh. The presented model combines a different numbers of parameters and variables, rele...
Data
There are several systems that produce energy from low grade heat sources such as Stirling engines, thermoelectric generators, and ORC (Organic Rankine Cycle) systems. This paper shows the heat recovery from exhaust gases of a 1400 cc Diesel engine, to vaporize the working fluid of a small (<10 kW) ORC system. The main objective is to have a system...
Article
Full-text available
There are several systems that produce energy from low grade heat sources such as Stirling engines, thermoelectric generators, and ORC (Organic Rankine Cycle) systems. This paper shows the heat recovery from exhaust gases of a 1400 cc Diesel engine, to vaporize the working fluid of a small (<10 kW) ORC system. The main objective is to have a system...
Article
Full-text available
Current portable power generators are mainly based on internal combustion engine since they present higher values of efficiency comparing to other engines; the main reason why internal combustion engine is not convenient for micro power generation (5 - 30 kW) is because of their heaviness. Micro and ultra micro gas turbine devices, based on a micro...
Conference Paper
Full-text available
This work investigates the feasibility of manufacturing a turbine blade made of a Ti-Al intermetallic alloy by means of investment casting. The work is based on a multidisciplinary approach that combines a conventional CFD analysis of the flow field around the statoric and rotoric blades with the results of several metallurgical studies aimed at th...
Article
Full-text available
Although tissue and cell manipulation nowadays is a common task in biomedical analysis, there are still many different ways to accomplish it, most of which are still not sufficiently general, inexpensive, accurate, efficient or effective. Several problems arise both for in vivo or in vitro analysis, such as the maximum overall size of the device an...
Article
Full-text available
There are several systems that produce energy from low grade heat sources such as Stirling engines, thermoelectric generators, and ORC (Organic Rankine Cycle) systems. This paper shows the heat recovery from exhaust gases of a 1400 cc Diesel engine, to vaporize the working fluid of a small (<10 kW) ORC system. The main objective is to have a system...
Article
Full-text available
In the last years, in formula racing cars championships, the aerodynamic had reached an ever more important stance as a performance parameter. In the last four seasons, Red Bull Racing Technical Officer had designed their Formula 1 car with the specific aim to generate the optimal downforce, in relation to the car instantaneous setup. However, this...
Article
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With the increasing popularity enjoyed by ultra-micro scale turbomachinery, designers are often faced with severe challenges due to the substantial phenomenological difference between the low-Reynolds fluid-dynamics in rotating or strongly curved flows and the established knowledge acquired through decades of theoretical and experimental studies on...
Conference Paper
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Nowadays, wind technology can be considered mature and widespread technology, and its diffusion is strictly connected to the availability and accessibility of windy sites. The specific orographic configuration considered has to be capable of developing the diffusion of wind farms, and suggests the use of these alternative system configurations. The...
Conference Paper
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New energy scenarios see renewable energy is no longer as marginal sources, but as actresses able to change the energy market. The past few years have seen the energy market more fluid than that of past decades, the constant growth of the renewable component of the global energy mix has changed the relationship between offer-demand and also because...
Article
Full-text available
The aim of this work is to analyze the performance of a commercial micro gas turbine, focusing on the analysis of the fuel consumption and the outlet compressor and turbine temperature at various rpm, and to evaluate and compare the efficiency of the device. A test bench has been assembled with the available equipment in the laboratory of the depar...
Conference Paper
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Plug-in hybrid electric vehicles are commonly designed to work in Charge Depleting/Charge Sustaining (CD/CS) mode, depleting the battery by driving in only-electrical mode until the SoC reaches its minimum acceptable threshold, and then sustaining the state of charge till the end of the mission, operating as a traditional hybrid vehicle. Nonetheles...
Article
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The aim of this paper is to present a thermodynamic cycle for the production of electrical power in the 2–5 kW range, suitable for all types of thermally propelled vehicles. The sensible heat recovered from the exhaust gases feeds the energy recovery system, which is able to produce sufficient power to sustain the air conditioning system or other a...
Article
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Currently, one of the leading technologies for the "energy recovery" adopting a Rankine cycle (ORC) with organic fluids. ORC system operates like a conventional Rankine cycle, but instead of steam/water, uses an organic fluid. This change allows to convert low temperature heat and generate, where required, electricity. A large amount of studies wer...
Article
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Nowadays, the Organic Rankine Cycle (ORC) system, which operates with organic fluids, is one of the leading technologies for “waste energy recovery”. It works as a conventional Rankine Cycle but, as mentioned, instead of steam/water, an organic fluid is used. This change allows it to convert low temperature heat into electric energy where required....
Article
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tion kit for transforming small city cars, powered by an original diesel engine, into a parallel hybrid vehicle. The study was jointly conducted by the University of Rome “Sapienza” and the Enea Casaccia research center. The idea is to design a hybrid powertrain that can be installed in a typical microcar, which means that all systems and component...
Conference Paper
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The paper analyses the thermodynamic feasibility of an innovative Organic Rankine Cycle (ORC) recovery system. Among the many applications of this device, particular interest covers the application as bottoming systems for the exploitation of wasted heat from the exhaust gases of an ordinary ICE. The vehicle thermal source can be either a typical d...
Article
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In recent years, renewed interest in the development of unmanned aerial vehicles (UAVs) has led to a wide range of interesting applications in reconnaissance and surveillance. In these missions, the noise produced by propeller-driven UAVs is a major drawback, which can be partially solved by installing an electric motor to drive the propeller. Whil...
Conference Paper
Full-text available
The paper analyses the feasibility of an “on-board” innovative and patented ORC recovery system. The vehicle thermal source can be either a typical diesel engine (1400 cc) or a small gas turbine set (15-30 kW). The sensible heat recovered from the exhaust gases feeds the energy recovery system that can produce sufficient extra power to sustain the...
Article
Full-text available
The paper analyses the feasibility of an "on-board" innovative and patented (patent ID RM2011 A 000671) ORC recovery system. The vehicle thermal source can be either a typical diesel engine (1400 cc) or a small gas turbine set (15-30 kW). The sensible heat recovered from the exhaust gases feeds the energy recovery system that can produce sufficient...
Article
Full-text available
A longstanding interest of the Authors' research group at University of Roma Sapienza (UDR1) is the design, development and fielding of a road prototype of a new concept of Hybrid Series vehicle, endowed with a small Gas Turbine set as a thermal engine. This solution offers several advantages with respect to traditional internal combustion engines...
Article
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The paper presents a comprehensive review of the gas turbine hybrid vehicle (GTHV) under development at the University of Roma “Sapienza.” A GHTV is an electric vehicle (traction entirely electric on 1 or 2 axles) equipped with a small turbogas operating as a range extender and –when needed- as a recharger for other auxiliaries. After a brief revie...
Article
Full-text available
The ever increasing development of portable electronics has led to a higher demand for compact and reliable power sources. Significant resources are being presently dedicated to the study of micro machined gas turbines, because of their remarkable power density. The paper reports the procedures and the results of a series of tests conducted at the...
Article
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The scope of the present paper is to investigate the suitability of a mathematical model for Circulating Fluidized Bed (CFB) coal combustion (developed by the International Energy Agency), to predict and simulate the performance of the 100 kWth CFB for air-blown biomass gasification. The development of a mathematical model allows to simulate the op...
Conference Paper
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A GTHV (gas turbine hybrid vehicle) is an electric vehicle with traction entirely electric on 1 or 2 axles, equipped with a small turbogas whose only function is that of recharging the battery pack and possibly other energy storage devices present on board. After a brief review of the history of the GTHV technology, a complete feasibility assessmen...
Conference Paper
Full-text available
The design of micro and ultra-micro turbomachinery introduces severe challenges due to the absence of a reliable and sufficiently extended database, so that the phenomenological differences among microturbomachines and between micro- and commercial-scale devices must be semi-empirically modelled from case to case. Scope of this study is to verify t...
Article
Full-text available
Nowadays the utilization of vegetable oils, particularly the palm oil, as fuel in the power plant, has made a significant development in the last few years. This vegetable oil can be used in particular in slow marine-derived diesel internal combustion engine (ICE), with an electric efficiency of about 40%. The efficiency is connected to the size of...