Daduí C Guerrieri

• PhD
• Professor (Associate) at Federal Center for Technological Education Celso Suckow da Fonseca

Objective: This research aims to analyze the leading publications on energy efficiency in small and medium-sized enterprises (SMEs) to present how the topic is being addressed in the literature. Theoretical Framework: The worsening of global warming, resulting from the increased emission of greenhouse gases, has been widely observed. Industrial exp...

Objective: To analyze the commitment to sustainability and sustainable public procurement by individuals, organizations, and the political class, based on the perceptions of agents working in the procurement area. Theoretical Framework: The main concepts and theories on sustainability and sustainable public procurement (SPP) were presented, as well...

O Estado brasileiro tem adotado um conjunto de medidas que visam implementar práticas sustentáveis na iniciativa pública e privada. No que tange ao setor público, a norma jurídica exige a elaboração, implementação e avaliação dos Planos de Gestão de Logística Sustentável (PLS), cuja finalidade é estabelecer práticas de sustentabilidade e racionaliz...

As organizações estão sob constante pressão da sociedade para atuarem de forma mais responsável em relação aos limites planetários e à própria sociedade. A preocupação com as mudanças climáticas, a degradação ambiental e a desigualdade social levaram a um aumento na exigência por parte dos consumidores, investidores e outros stakeholders para que a...

The growing world demand for electrical energy associated with the increasing greenhouse gas emissions is resulting in a growing need to use clean energy. Solar energy is one of the clean energy solutions that has been growing and consolidating around the world. In Brazil, to incentivize the use of solar energy, the government enabled and stimulate...

Electrothermal propulsion can be seen as an intermediate concept between electrical and chemical propulsion. Propellant heating typically happens by means of a resistance (resistojet) or an electrical discharge (arcjet). For the extremely miniaturized applications that will be discussed in this chapter, resistojets are by far the most commonly used...

An environment to handle microdevices is a challenge because the natural dusts have a size which is relatively big when compared to the microdevices. The dusts might cause irreparable damage to microdevices such as short circuit in electronic systems, clogging in microfluidic systems, and even corrosion in the materials. The dust is a real challeng...

Delft University of Technology is currently developing the pico-satellite platform Delfi-PQ, based on the PocketQube standard, in pursuit of a new generation of satellites with lower cost, flexibility and short development time. A technology demonstration payload expected to fly in one of the first Delfi-PQ satellites is a dual thruster micro-propu...

Delft University of Technology is currently developing the pico-satellite platform Delfi-PQ, based on the PocketQube standard, in pursuit of a new generation of satellites with lower cost, flexibility and short development time. A technology demonstration payload expected to fly in one of the first Delfi-PQ satellites is a dual thruster micro-propu...

This paper presents the experimental and theoretical analysis of a micro heat exchanger designed for the waste heat recovery from a high concentration photovoltaic (HCPV) system. A test bench was built to analyze the thermal behavior of a heat exchanger targeted to work in a similar condition of an existing HCPV panel. A high power heater was encap...

This brief presents a comprehensive approach for the modeling of micropropulsion systems based on the vaporization of a liquid. The model combines the analytical and empirical relations derived from extensive experimental analysis and fundamental physical laws. This allows modeling of key parameters, such as mass flow rate, for the entire system co...

There is a clear trend towards the developments of micro-propulsion system to enhance the capabilities of nano- and pico-satellites. A promising propulsion option to meet the strict requirements of these small satellites is the Low-Pressure Micro-Resistojet (LPM) which works under rarefied gas dynamic regime. To simplify the engineering design of t...

Vaporizing Liquid Microthrusters (VLM) have recently received attention as promising propulsion technology for highly miniaturized spacecraft due to its high thrust levels and low power consumption. This paper presents the results of numerical optimization of the parameters for the design of the heating chamber of VLMs that use water as the propell...

As a further step in the research towards miniaturization of satellite components and sub-systems, the Department of Space Systems Engineering at the Delft University of Technology has recently embarked in the end-to-end engineering of the Delfi-PQ picosatellite platform, designed according to the PocketQube size standard. This new satellite platfo...

A Low-Pressure Micro-Resistojet (LPM) is under development at TU Delft with the intention to provide future nano- and pico-satellites with the necessary capability to execute formation flying maneuvers, orbit change maneuvers, and station keeping. In this particular type of electro-thermal thruster, water is a green propellant of excellent performa...

CubeSats have been extensively used in the past decade as scientific tools, technology demonstrators and for education. Recently, PocketQubes have emerged as an interesting and even smaller alternative to CubeSats. However, both satellite types often lack some key capabilities, such as micropropulsion, in order to further extend the range of applic...

Three low pressure micro-resistojets (LPM) with integrated heater and temperature measurement were designed, manufactured and characterized at Delft university of technology. The devices were manufactured using silicon-based micro electro mechanical systems (MEMS) technology including a heater made of molybdenum for better operations at high temper...

This paper presents the results of design, manufacturing and characterization of Vaporizing Liquid Microthrusters (VLM) with integrated molybdenum heaters and temperature sensing. The thrusters use water as the propellant and are designed for use in CubeSats and PocketQubes. The devices are manufactured using silicon based MEMS (Micro Electro Mecha...

The number of launches of nano- and pico-satellites have significantly increased over the past decade. Miniaturized subsystems, such as micro-propulsion, for these classes of spacecraft are rapidly evolving and, in particular, microresistojets have shown great potential of applicability. One of the key points to address in the development of such d...

The aerospace industry is recently expressing a growing interest in green, safe and non-toxic propellants for the propulsion systems of the new generation of space vehicles, which is especially true in the case of Cubesat micro-propulsion systems. Demanding requirements are associated to the future missions and challenges offered by this class of s...

Heat transfer and fluid flow through different microchannel geometries in the transitional regime (rarefied flow) are analyzed by means of direct simulation Monte Carlo (DSMC) simulations. Four types of three-dimensional microchannels, intended to be used as expansion slots in microresistojet concepts, are investigated using nitrogen as working flu...

The Direct Simulation Monte Carlo method is used to describe the heat and fluid flow properties of a Low Pressure Free Molecular Micro-Resistojet working in the transitional regime (rarefied gas dynamics). The propellant considered in this propulsion concept is water. Different microchannels geometries were analysed presenting the impact of the div...

This paper presents a dynamic system approach for the modeling of fluid flow in microchannels to be used in thrust control applications. A micro-resistojet fabricated using MEMS (Microelectromechanical Systems) technology has been selected for the analysis. The device operates by vaporizing a liquid propellant, in this case water, and expelling it...

HCPV (High Concentration Photovoltaic) systems operate more efficiently once the solar cell is kept cooled by suitable heat sinks. Most of the commercial HCPV systems are based on passive air-cooling systems, especially due to their simplicity and robustness, while here an alternative approach is considered to remove heat more efficiently from the...

This paper presents a numerical analysis of an optimized heat exchanger based on micro-channels for efficient active water cooling of a commercial high concentration photovoltaic (HCPV) system. In the theoretical study, four different cases were analyzed using the finite element method through the computational platform COMSOL Multiphysics 4.2a. Cr...

This paper presents the optimized design, fabrication and experimental analysis of a heat sink based on microchannels for efficient cooling of a commercial high concentration photovoltaic (HCPV) cell. The optimized geometry of the heat sink was made using the platform ANSYS program Workbench 14.5 CFX and optimization tool Response Surface optimizat...

This study is a comparison of the thermophysical properties of the fluids conventional water and ethylene glycol with nanofluids Al2O3 and CuO immersed in water and glycol etilenio, and the other hand, demonstrate its feasibility for use in industrial heat exchangers. The purpose of this paper is to present this new class of fluid called nanofluid,...