English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

espanolEn la presente investigacion se evaluo experimentalmente la eficiencia de un colector solar de tubos evacuados (CSTE) sin y con tubo de calor en dias soleados, parcialmente nublados y nublados. En total se realizaron 46 experimentaciones durante 23 dias: marzo a junio del 2017, con dos CSTE sin y con tubo de calor de 100 y 120 L, respectivamente. La radiacion solar en la superficie horizontal y temperatura del agua en la salida del tanque de almacenamiento se registraron durante 5 horas (9:30 am a 2:30 pm) en intervalos de 30 y 10 s, respectivamente. Para las representaciones y estimaciones de la eficiencia se utilizo el lenguaje de programacion Matlab. Los resultados muestran una ligera superioridad de eficiencia del CSTE con tubo de calor (60,35%, 61,21% y 66,08%) comparado al sin tubo de calor (57,17%, 57,29% y 59,56%), medidos en dias soleados, parcialmente nublados y nublados, respectivamente. Y se observa que en el CSTE con tubo de calor es mayor el incremento de la eficiencia en dias nublados por las menores perdidas de calor debido a un menor incremento de la temperatura, generando un mayor aprovechamiento de la energia solar incidente. El analisis de varianza indico que la condicion de la radiacion solar y tubo de calor del CSTE no influyen significativamente en la eficiencia energetica de este colector solar. De acuerdo a la condicion de radiacion solar (dias soleados, parcialmente nublados y nublados), el CSTE con tubo de calor presento una mayor eficiencia de 3,20 %, 3,92 % y 6,52%, respecto al CSTE sin tubo de calor. EnglishThis research study evaluated the efficiency of a solar evacuated tube collector (SETC) with and without a heat pipe on sunny, partially cloudy and cloudy days, experimentally. A total of 46 experiments were conducted during a period of 23 days: from March to June 2017 with two (SETC) with and without a heat pipe of 100 and 120 L, respectively. Solar radiation in the horizontal surface, and water temperature at the outlet of the storage tank were registered for 5 hours (9:30 a.m to 2:30 p.m) with intervals of 30 and 10 seconds, respectively. The Matlab programming language was used for representations and estimates of efficiency. Results show a slight superiority in the efficiency of the SETC with a heat pipe of (60,35%, 61,21% and 66,08%) compared to the one without heat pipe (57,17%, 57,29%and 59,56%), measured on sunny, partially cloudy and cloudy days, respectively. It was observed that on cloudy days, the SETC with a heat pipe presented an increase in the efficiency as a result of lower heat losses due to a lower increase in temperature thus generating a greater use of incident solar energy. The variance analysis indicated that the solar radiation and tube heat condition of the SETC do not influence significatively in the energy efficiency of this solar collector. According to the condition of solar radiation (sunny, partially cloudy and cloudy days), the SETC with a heat pipe presented a higher efficiency of 3.20%, 3.92%, and 6.52%, compared to the SETC without a heat pipe.

Evaluación experimental de la eficiencia de un colector solar de tubos evacuados sin y con tubo de calor