In the competition of the lighting market, LED technology has stood out for excellent characteristics, one of which is the possibility of dimming, compared to other technologies. The dimming capacity allows to find the comfort zone with respect to two parameters, illuminance and correlated colour temperature (CCT). The present work provides a methodology to find comfort with respect to two variables, the level of illumination and the CCT. A controller with a simple structure, supported by Arduino, is proposed to control the above-mentioned variables of LEDs. The LEDs are located on a tape attached to a heat sink. In addition, the use of a light box as an environment for analysis is proposed. The design of this cubicle is based on literature. The controller has the possibility to regulate 12 different channels and the linearity between the PWM output and the illuminance was verified. The ...

The objective of the present study is to select appropriate wall materials for houses in high Andean regions based on the measurements of the thermal behavior of construction materials using a "Test Cell" under real environmental conditions. It will be the first "Test Cell" to be installed in Peru, in Imata-Arequipa, at 4500 masl. The design and thermal analysis of the "Test Cell" are presented using dynamic simulations with the EnergyPlus program. Initially, the thermal performance of adobe, a traditional construction material in rural regions of Peru, is simulated using real meteorological data recorded in Imata between August 18 and 24, 2018, a period with low temperatures (-12.6 °C). © Published under licence by IOP Publishing Ltd.

This study includes the evaluation and validation of two experimental housing modules built in Imata, Arequipa, Peru, at 4500 meters above sea level (masl) and with a very cold climate. The modules are similar, differing only in that one of them has a greenhouse attached to the north wall. The design and materials used in the module envelopes are similar to what is mostly used locally. For the simulation work and the validation of the energetic behavior, both modules were equipped for the acquisition of the temperatures in the interior, and for the simulation, the EnergyPlus software was used. The exchange of air between the module with the greenhouse and its greenhouse was controlled by means of opening and closing the door and window that connected them, using different configurations. When the door and the window are open during daytime, the temperature inside the module can increase ...

J. L. Mírez thanks to the National Council of Science and Technology of Peru (CONCYTEC) for funding his doctoral research at National University of Engineering and partially supported by MIGEDIR project: Microgrids with Renewable Distributed Generation (code 713RT046) from the Science and Technology for Development Iberoamerican Program (CYTED), also at Development of Renewable Energy Sources (CEDER) of CIEMAT in Soria, Spain; Electric Power System Research Group of Sandia National Laboratories in Albuquerque, New Mexico, USA; and, Center for Information and Communication Technologies (CTIC) of the National University of Engineering, Lima, Peru.

Evaluation results of the thermal performance of an experimental housing module (EHM) are presented with considerations for the level of insulation and the installation of two active heaters powered by solar energy. The EHM is located in a high Andean rural area in southern Peru (latitude: 13° 45'40" S, longitude: 73° 51'26" W, and elevation: 3700 masl), where in situ measurements were made. The design and implementation of the EHM was based on the application of bioclimatic strategies and techniques. For the thermal evaluation of the EHM, 43 temperature sensors connected to dataloggers were used. The results show that the temperature inside the EHM increased more than 12 °C with respect to the outside temperature in the critical hours of extreme cold and frost when the isolation and the proposed radiative systems are used. Finally, the thermal behavior of the EHM was simulated using ...

A millenary building material that has been used in many cultures is "adobe". In the Peruvian Andean regions during the winter, the temperature decreases drastically (+5 to -15°C), affecting the health of people of vulnerable age, agriculture and bovine livestock. Bioclimatic techniques must be considered to provide a comfortable thermal environment in the interior of housing. Furthermore, knowing the thermal conductivity of the elements that compose the houses allows us to perform thermal exchange simulations before construction is developed. Specifically, in this investigation, the thermal conductivity of adobe with and without Stipa ichu was measured as 0.371 W/m K and 0.349 W/m K, respectively, considering the norm ASTM C177 for that purpose. The mechanical behavior is as important as the thermal properties, and a value of 2.41 N/mm2 was obtained for unit compression. Additionally, ...