Search Results (3)

Global fossil fuel consumption, including diesel and gasoline, significantly contributes to emissions. Understanding emission percentages and types is critical. Alternative energies, like hydrogen mixed with gasoline, help mitigate emissions in sectors such as transport and energy. Hydrogen-gasoline blends in internal combustion engines improve the combustion process but require studying engine behavior and carbon footprint. This research designs a low-cost sensor network to monitor combustion emissions and provide reliable data for statistical comparison across vehicles. Two synchronized client–server software systems are proposed. The client software runs on an IoT development board (ESP32) and communicates with sensors via the ESP-NOW protocol to detect and collect gas data, transmitting it wirelessly to the web server. The server software provides a user-friendly interface for data control and visualization from a ground station. Tests used 100% Mexican gasoline (G100) and hydrogen-gasoline blends (GH) with a hydrogen cell electrolyte concentration of 0.0211 mL/gal (80 mL). A single vehicle followed the same route at 40–60 km/h, collecting data every 30 s over three trials. Results showed average reductions of 5% and 10% in CO and CO₂ emissions, respectively, with GH fuel. Full article

By the year 2020, 90% of the population with access to electricity worldwide was surpassed. However, the reality is very different for many countries, especially for those on the African continent that had more than 572 million people without electricity service at the end of 2019. This work studies the implementation of an isolated microgrid activated with photovoltaic energy and energy storage in batteries under the case study of the community of Bigene, located in the African country of Guinea-Bissau. This type of project is a potential solution to the problem of access to energy, but as the cost of the energy storage system is typically very high, this work technically and economically addresses the effect of using absorbed glass material (AGM) and lithium batteries. A simulator was developed using TRNSYS software to analyze the operation of the microgrid under a defined annual demand profile for different types of users, and economic analysis was conducted considering a project lifetime of 25 years. The results showed no significant differences in the solar fraction of both types of batteries when the photovoltaic power was less than 600 kW, regardless of the capacity of the storage bank. The analysis of auxiliary power requirements showed that lithium technology leads to a lower consumption from 800 kW of PV capacity, and utilizing less than this capacity did not have a significant difference with AGM batteries. In this microgrid with a photovoltaic capacity of less than 700 kW and an energy storage of less than 2580 kWh, the type of storage technology, AGM or lithium, did not represent a considerable difference in the levelized cost of energy, indicating that AGM technology could be selected considering its low initial investment cost compared to lithium batteries. Full article

This study shows the results of a simulation tool using the TRNSyS 2017 simulator, validated with experimental data from a greenhouse in an arid zone in northwestern Mexico. Additionally, experimental data on the performance of geothermal heat pumps are shown during the year 2020 in heating and cooling mode. With this information, an average deviation of the simulator for the outlet fluid temperature of the geothermal heat exchanger (GHE) of 2.77% and an average deviation of the coefficient of performance in cooling mode (EER) of the geothermal heat pump (GHP) of 3.7% was obtained. In the experimental study, it was observed that in the last 2 weeks of July and the first 2 weeks of August, the subsoil is saturated, which causes a decrease in the thermal inertia of the GHE. During the experimental study, it was possible to determine that the flow indicated in the GHE to obtain the highest performance of the GHP system in greenhouses in arid zones corresponds to 1 GPM, obtaining an EER of 3.24. Full article