Search

In the central jungle region of Peru, within the wet processing of coffee, the coffee pulp is discarded. This objective is to design a dual solar and gas dryer with continuous operation, for the dehydration of waste from wet processing of coffee for human use. The proposed objective is part of a broader project to apply the circular economy in the use of waste from wet coffee processing financed by Pro Ciencia. The following procedure was followed. At first, a 100 kg/Bach capacity gas and solar system dryer was designed applying the proposed technology development methodology in mechanical engineering and secondly arriving at the construction of the prototype. The results are to have a design methodology and the built prototype of the dual dryer (solar and gas) of continuous and semi-automated operation that has a control panel to allow programming and monitoring the drying process in real time. At the end of the project, the proposal will allow a continuous dehydration of the coffee pulp with quality, low cost and the industrialization of its by-products such as coffee pulp flour, filters and functional drinks.

The use of vertical axis wind turbines to electrify homes without electricity in the Peruvian region of Junín is essential to address the challenges of climate change and move towards a more sustainable and environmentally friendly future. The objective was set to compare three types of wind turbines, these are Darrieus H, Savonius, and Windside concerning to the wind speeds that occur in the Junín region. This is because the operation of these wind turbines in this region is not yet known. The following procedure was tracked: first, the design was made and then it was experimented in the wind tunnel laboratory of the Faculty of Electrical and Electronic Engineering of the National University of Central Peru. In the study, we took into account that there is indeterminacy in the variable wind speed among others, which is why we adapted the traditional variables to the use of neutrosophic numbers. Additionally, we carried out a comprehensive study that includes other variables for decision-making. To select the best complete option we asked a group of 3 experts for their evaluations according to several criteria and we used the VIKOR method for intervals adapted to neutrosophic numbers. [ABSTRACT FROM AUTHOR]

In this work, an autonomous and automated solar dryer has been developed to dry potatoes in the town of Tarma at an altitude of 3 040 m in July 2019, which has a solar collector with two reflectors, a drying chamber with a capacity of 20 kg, photovoltaic panel and a control system. The thermal behavior of the no-load solar dryer was studied, achieving increases in the temperature in the drying chamber of up to 50.7 ±7 °C with solar radiation of 880 ±144 W m-2 h-1. The effect of pretreatment was evaluated with two concentrations of sodium bisulfite (0.02% and 0.03%) and three drying temperatures (50 °C, 55 °C and 60 °C) to evaluate the physical (L*), physical-chemical characteristics (acidity, pH) and chemicals (humidity and ash). The results showed a reduction of 70% of the water having a final humidity between 12.56% to 13.85%. Likewise, no significant difference (p> 0.05) was found between the physical, physicochemical, and chemical characteristics at the different bisulfite concentrations and drying temperatures of the Yungay potato. These potato quality parameters are in accordance with the Peruvian standard NTP 011.119 ‘potato and its derivatives: potato, definitions and requirements’, which offers an efficient alternative to dehydrated agricultural products. [ABSTRACT FROM AUTHOR]

The research aimed to develop a children's pumpkin compote, functional, inexpensive, preservative-free and of considerable shelf life. The effect of incorporating xanthan gum (XG) was evaluated at three concentrations (0.10%, 0.15% and 0.20%) on its rheological properties. Sensory characteristics were applied to 60 panelists (30 undergraduate students and 30 children between 2 and 3 years). Its physical, physicochemical, and microbiological characteristics were determined. With the pH values was estimated the shelf life of pumpkin compote using accelerated testing method. The product was stored at 20 °C, 30 °C and 40 °C for 0, 10, 20, and 30 days. The results show the pumpkin compote presented non-Newtonian behavior, pseudoplastic, and was adjusted to the Ostwald Waele model (R2 > 0.98). Compote formulated with 0.15% of XG was conceived as the best treatment, with a "Like" scale for color attributes, smell, texture, taste and general appearance (3.80 to 4.13 points) associated with the presence of 82.45% humidity, 5.40 pH, 17 °Brix, and absence of molds, yeasts and total coliforms. Influence of temperature on viscosity was modeled using Arrhenius equation, showing a decrease in viscosity with increasing temperature. Finally, the estimated shelf life at 20 °C, 30 °C and 40 °C were 125, 75, and 45 days, respectively. [ABSTRACT FROM AUTHOR]