Giulia Righetti
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A Comparative Experimental Analysis of a Cold Latent Thermal Storage System Coupled with a Heat Pump/Air Conditioning Unit Open
The decarbonization of residential cooling systems requires innovative solutions to overcome the mismatch between the renewable energy availability and demand. Integrating latent thermal energy storage (LTES) with heat pump/air conditionin…
Experimental investigation of high temperature organic phase change materials for waste heat recovery Open
This paper compares the performance of two high temperature organic phase change materials during solid/liquid phase change to study the effects of 3D printed periodic structures in enhancing the heat transfer performance. The experimental…
On the numerical simulation of a phase change material melting inside periodic structures: from validation to optimization Open
Nowadays, numerical models are considered powerful design tools, which are largely used in several engineering applications. When applied to heat transfer applications, they have already been shown to be reliable, especially in single phas…
Experimental investigation of the cooling performance of an additively manufactured prototype for nuclear fusion energy application Open
Metal Additive Manufacturing (MAM) is a non-traditional technology recently introduced to manufacture multifunctional mechanical components. In fact, recent developments in Laser Powder Bed Fusion (LPBF) process have enabled the production…
Experimental thermal analysis of an innovative heat sink coupled to a nanoemulsion Open
This work presents some new experimental measurements collected on a very innovative system proposed for electronic cooling. This setup combines a classical heat sink with a latent thermal storage. The storage material is a phase change na…
View article: Validity of Machine Learning in Predicting Giant Cell Arteritis Flare After Glucocorticoids Tapering
Validity of Machine Learning in Predicting Giant Cell Arteritis Flare After Glucocorticoids Tapering Open
Background Inferential statistical methods failed in identifying reliable biomarkers and risk factors for relapsing giant cell arteritis (GCA) after glucocorticoids (GCs) tapering. A ML approach allows to handle complex non-linear relation…
Experimental Study Onon Organic PCM Forfor High Temperature Applications Open
One of the main current technological challenges is to satisfy the global growing demand for energy with a sustainable and environmentally friendly offer.For this reason, the amount of renewable energies is increasing considerably coupled …
Experimental and Numerical Analyses of Pressure Drops In A 3D Printed Foam Open
Open-cell foams have many interesting combinations of physical, thermal, and mechanical properties.They are currently adopted in many technological applications in the automotive and aerospace industry, energy storage, medical and biomedic…
Optimized 3D periodic structures for advanced Latent Thermal Energy Storages (LTESs) via additive manufacturing. Open
The use of a Latent Thermal Energy Storage (LTES) system using suitable Phase Change Materials (PCMs) is an effective way of storing energy because of its high-energy storage density and isothermal nature of the storage processes. Unfortu…
R1233zd(E) and R1234ze(Z) condensation inside a 4 mm horizontal smooth tube. Open
R1233zd(E) and R1234ze(Z) have been proposed as low Global Warming Potential (GWP) refrigerants for high temperature heat pumps. But their application is still not widespread and their heat transfer performance are still poorly investigate…
Development of a propane double duct room air conditioner. Open
Double duct room air conditioners (DD-AC) are compact systems with no external heat exchanger unit. Outdoor air flow is conveyed through two ducts crossing external walls. Design and optimization of a DD-AC operating with R290 are reported…
R1234ze(Z) and R1233zd(E) vaporisation inside a brazed plate heat exchanger (BPHE). Open
This paper presents the boiling heat transfer coefficients of R1234ze(Z) and R1233zd(E) inside a commercial Brazed Plate Heat Exchanger (BPHE): the effects of heat flux / mass flux, saturation temperature / pressure, outlet conditions and …
A numerical analysis of latent thermal energy storage for refrigerated trucks. Open
Refrigerated transportation has a primary role in assuring quality and safety of perishable products. About 4 million of refrigerated vehicles run worldwide. The energy requested for the foodstuff carriage only is about 40% of the total en…
Experimental pressure drops during the water flow into porous materials realized via additive manufacturing Open
Open-cell foams offer several interesting possibilities in numerous technological fields. In fact, they present high surface area to volume ratio as well as enhanced flow mixing and attractive stiffness and strength. However, their complet…
Saturated R1234yf flow boiling inside a compact microfin tube. Open
This paper explores the heat transfer and fluid flow characteristics of the low-GWP refrigerant R1234yf during flow boiling inside a mini microfin tube with internal diameter at the fin tip of 4.2 mm, 40 fins, 0.15 mm high, and a helix ang…
Experimental study on the role of metal foams in a vertical PCM-based thermal energy storage tube. Open
In this work an aluminum foam is proposed and studied to increase the thermal conductivity of a commercial paraffin wax having a melting temperature of around 40 °C and to decrease the charging and discharging times. Two samples were exper…
View article: Disentangling the Association of Hydroxychloroquine Treatment with Mortality in Covid-19 Hospitalized Patients through Hierarchical Clustering
Disentangling the Association of Hydroxychloroquine Treatment with Mortality in Covid-19 Hospitalized Patients through Hierarchical Clustering Open
The efficacy of hydroxychloroquine (HCQ) in treating SARS-CoV-2 infection is harshly debated, with observational and experimental studies reporting contrasting results. To clarify the role of HCQ in Covid-19 patients, we carried out a retr…
Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a Open
R134a was recognized as probably one of the most important refrigerants of the two past decades. Among the proposed alternative fluids, there are certainly isobutane (R600a) and R152a. This article presents about 200 new heat transfer coef…
Heat transfer assessment of the low gwp substitutes for R245fa in ORC. Open
This paper presents the heat-transfer assessment of different low GWP substitutes for traditional R245fa as a working fluid for ORC. The assessment is carried out by applying a theoretical analysis based on specific Performance Evaluation …
View article: Effect of Refrigerant Properties Estimation on the Prediction Capabilities of Well-Established Two-Phase Heat Transfer and Pressure Drop Models for New Refrigerants
Effect of Refrigerant Properties Estimation on the Prediction Capabilities of Well-Established Two-Phase Heat Transfer and Pressure Drop Models for New Refrigerants Open
R1233zd(E) and R1224yd(Z) are two HCFO (Hydro Chloro Fluoro Olefin) low-GWP refrigerants recently proposed as substitutes of the HFC (Hydro Fluoro Carbon) fluids commonly used in air conditioning, high temperature heat pumps and ORC applic…
Water Pool boiling on Aluminum Metal Foams Open
With current growth in electronic systems, their physical sizes decrease, and the spacing between components decreases, both the total amount of heat generated and the power density increase significantly. There is a general agreement in t…