"[
ABSTRAKSelain tantangan untuk mereduksi penggunaan energi tak terbarukan yang
menyebabkan pemanasan global, potensi besar Indonesia dalam menerima panas dari
matahari harus dioptimumkan. Pemanfaatan energi panas dari matahari masih rendah,
oleh karena itu solar kolektor bertipe tabung vakum merupakan solusi yang bijak
untuk memanfaatkan panas tersebut. Dengan menggunakan heat pipe sebagai media
penghantar panas yang pasif, solar kolektor dapat bekerja tanpa konsumsi energi
tambahan. Karakterisasi dibawah sinar matahari dan dengan menggunakan lampu
halogen beserta voltage regulator dilakukan untuk mengetahui panas yang diserap
oleh prototipe. Pada eksperimen ini, kotak insulasi yang dibuat dari styrofoam dan
kayu digunakan untuk mengetahui kerugian panas.
Untuk meningkatkan jumlah panas yang diserap, plat penyerap panas yang diberi
lapisan coating digunakan pada heat pipe. Optimasi performa thermal dilakukan
dengan memvariasikan fluida kerja, wick, dan aplikasi sudut kemiringan, dimana air
suling, nanofluida Al2O3-air dengan konsentrasi volumetris sebesar 5% dan 0,3%
digunakan sebagai fluida kerja, stainless steel screen mesh dengan skala mesh 200,
250, dan 300 digunakan sebagai wick, dan sudut aplikasi divariasikan pada sudut 0o –
60o dengan 15o perubahan sudut kemiringan.
Hasil eksperimen dan analisis lanjutan menunjukan bahwa performa thermal
terbaik dari prototipe solar kolektor didapatkan dengan penggunaan nanofluida
Al2O3-air dengan konsentrasi volumetris 0,3% dan wick dengan skala mesh 300 dan
sudut kemiringan sebesar 60o. Resistansi thermal terbaik diketahui sebesar 0,592
oC/W dengan efisiensi sistem yang mencapai 76,53%.
ABSTRACTBeside the challenges to reduce the consumption of nonrenewable energy that
causes global warming, Indonesia great potential in receiving heat from the sun must
be optimized. Since the utilization of thermal energy from the sun is still low, vacuum
tube solar collector will be a well applicable solution to utilize the heat. Using heat
pipes as passive heat transfer device, this research was conducted to optimize the
thermal performance of solar collector without using extra energy. Characterization
under the sun, and using halogen lamp with voltage regulator was done in order to
predict the heat absorbed by the designed prototype. In this experiment, insulation
box, which made of Styrofoam and wood was made to calculate heat losses.
To increase heat absorbed, coating fin is applied at heat pipe. Optimization of
thermal performance of solar collector was done with varied working fluid, wick of
heat pipe, and inclination angle of prototype application, where condensed water,
Al2O3-water nanofluid with 5% and 0.3% volumetric concentration were used as
varied working fluid, stainless steen screen mesh with 200, 250, and 300 mesh scale
were used as wick, and inclination angle was varied from 0o – 60o with 15o
inclination angle differences.
Experimental result and further analysis shows that the best thermal performance
of solar collector prototype by using 0.3% volumetric ratio of Al2O3-water nanofluid
as working fluid, stainless steel screen mesh with 300 mesh scale as wick inside heat
pipe, and 60o inclination angle for prototype application. The thermal resistance is as
high as 0.592 oC/W and the system efficiency is as high as 76.53%., Beside the challenges to reduce the consumption of nonrenewable energy that
causes global warming, Indonesia great potential in receiving heat from the sun must
be optimized. Since the utilization of thermal energy from the sun is still low, vacuum
tube solar collector will be a well applicable solution to utilize the heat. Using heat
pipes as passive heat transfer device, this research was conducted to optimize the
thermal performance of solar collector without using extra energy. Characterization
under the sun, and using halogen lamp with voltage regulator was done in order to
predict the heat absorbed by the designed prototype. In this experiment, insulation
box, which made of Styrofoam and wood was made to calculate heat losses.
To increase heat absorbed, coating fin is applied at heat pipe. Optimization of
thermal performance of solar collector was done with varied working fluid, wick of
heat pipe, and inclination angle of prototype application, where condensed water,
Al2O3-water nanofluid with 5% and 0.3% volumetric concentration were used as
varied working fluid, stainless steen screen mesh with 200, 250, and 300 mesh scale
were used as wick, and inclination angle was varied from 0o – 60o with 15o
inclination angle differences.
Experimental result and further analysis shows that the best thermal performance
of solar collector prototype by using 0.3% volumetric ratio of Al2O3-water nanofluid
as working fluid, stainless steel screen mesh with 300 mesh scale as wick inside heat
pipe, and 60o inclination angle for prototype application. The thermal resistance is as
high as 0.592 oC/W and the system efficiency is as high as 76.53%.]"
