Enrique Ángel Rodríguez Jara

Universidad de Cádiz | UCA · Department of Thermal Machines and Motors

Radiative cooling has gained significant attention in recent years for its passive heat evacuation capabilities. Numerous materials have been developed, but comparing their cooling effectiveness has proven challenging due to inconsistent experimental conditions. This study aims to bridge this gap by evaluating the heat evacuation potential of vario...

Due to its relatively lower thermal conductivity, the suitability of wood is called into question when selecting the flooring material best suited to radiant heating systems. The European standard EN 1264 considers floorings with a thermal resistance over 0.15 m2 K/W to be out of scope. This belief was partially disproved in a previous article that...

Radiant floor heating is becoming increasingly popular in cold climates because it delivers higher comfort levels more efficiently than conventional systems. Wood is one of the surface coverings most frequently used in radiant flooring, despite the widely held belief that in terms of thermal performance it is no match for higher conductivity materi...

The temperatures required by ultra-low temperature applications, ranging from -50°C to -100°C, cannot be reached economically with single stage systems because of the limitation of the compression ratio. Different types of solutions such as cascade or two-stage systems could be implemented to achieve the desired working conditions. However, these s...

Spanish residential buildings built in the decade of the housing bubble (2000–2009) had to comply with the Basic Buildings Standard on thermal conditions in buildings. At the end of this period, the Basic Energy Savings Document of the Technical Building Code published in the Royal Decree 314/2006, transposing European Directive 2002/91/EC, entered...

Buildings are known to be responsible for about a third of energy consumption in developed countries. This situation, together with the fact that the existing building stock is being renovated at a very slow pace, makes it crucial to focus on the energy retrofitting of buildings as the only way to reduce their contribution to these energy consumpti...

Spanish residential buildings built during the real estate bubble (200-2009) complied with the Spanish Basic Building Standard on building thermal conditions NBE-CT-79. In 2006, the Basic Energy Saving Document of the Spanish Technical Building Code (CTE-DB-HE) came into effect. This code developed the Spanish Organic Law on Buildings 38/1999 and i...

This study presents the results of a numerical and experimental study of the position of the baffles in a solar air heater in order to improve its thermal and hydraulic performance. The numerical study was performed on four cases corresponding to different placements of baffles with Reynolds numbers ranging from 2370 to 8340. The experimental model...

The recent boom in distributed generation together with decreases in the cost of technology has resulted in photovoltaic energy becoming the most widely used means of producing electricity in buildings. Analysing this technology requires models that use the data available in the manufacturers' catalogues to study energetic and economic impact of th...

As microclimate modifiers, courtyards may be a good passive strategy for enhancing thermal comfort and reducing the energy demands of buildings. Thus, it is necessary to be able to quantify their tempering effect in dominant summer climates. This is frequently done using calculation methods based on CFD, but these have the drawback of their high co...

Este trabajo tiene como objetivo calcular de forma detallada los caudales de ventilación e infiltración y analizar su influencia sobre la demanda energética de edificios con uso residencial en España. Actualmente el Código Técnico de la Edificación (CTE) es la normativa española que regula los criterios de diseño, cálculo y la ejecución de las inst...

This study presents a method for estimating the temperature reached by the active layer of dye sensitised solar cells (DSSC) by applying a mathematical model based on a second-order lumped parameter model which takes into account the thermal resistance and heat storage capacities of the different layers of the DSSC. To obtain the input necessary fo...

A novel method for adjusting the parameters of a lumped parameter model for the transient thermal response of building constructions is presented. Previous analytical adjustment methods can be complex and inaccurate, while optimization algorithms, although more accurate, require prior simulation using a high-order reference model, and so provide no...

The aim of this paper is to assess the performance of several designs of hybrid systems composed of solar thermal collectors, photovoltaic panels and natural gas internal combustion engines. The software TRNSYS 17 has been used to perform all the calculations and data processing, as well as an optimisation of the tank volumes through an add-in coup...

This research focuses on the influence of outdoor convective heat transfer coefficient on thermal load calculation in Building Energy Simulation programs. In building energy is commonly used the overall heat transfer coefficient value (U-value) to characterize external walls and windows in terms of heat gam or loss through them. Thus, the higher th...