Rancang Bangun Alat Pengering Bunga Rosela (Hibiscus Sabdariffa L.) untuk Teh Herbal.

Maharani, Adhistana (2025) Rancang Bangun Alat Pengering Bunga Rosela (Hibiscus Sabdariffa L.) untuk Teh Herbal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bunga rosela (Hibiscus sabdariffa L.) memiliki potensi ekonomi yang tinggi di Indonesia, terutama sebagai bahan baku teh herbal. Rosela memiliki kadar air sekitar 86% saat proses pasca panen yang mana rentan mengalami penurunan kualitas pascapanen akibat kandungan air tinggi dan aktivitas mikroba. Pengeringan tradisional masih mengandalkan sinar matahari yang memakan waktu lama dan bergantung pada cuaca. Penelitian ini bertujuan untuk merancang dan membangun alat pengering bunga rosela otomatis skala prototipe. Sistem menggunakan sensor termokopel tipe-K, sensor capacitive soil moisture, dan load cell dengan PTC air heater dan fan sebagai aktuator, dikendalikan dalam sistem loop tertutup. Validasi dilakukan melalui proses kalibrasi terhadap masing-masing sensor. Hasil kalibrasi menunjukkan error termokopel sebesar ±0,5%, error sensor capacitive soil moisture sebesar ±0,02%, dan error load cell sebesar ±1%. Sistem mampu meningkatkan suhu dari 28°C ke 80°C dalam 1800 detik dan mempertahankan kestabilannya di sekitar set-point. Kinerja sensor menunjukkan akurasi dan sensitivitas yang baik selama proses berlangsung. Alat ini mampu mempercepat proses pengeringan, menghasilkan rosela kering dengan mutu lebih konsisten dan sesuai standar pasar.
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Roselle flowers (Hibiscus sabdariffa L.) have high economic potential in Indonesia, especially as a raw material for herbal tea. Roselle contains approximately 86% water content after harvest, making it highly susceptible to post-harvest quality degradation due to microbial activity. Traditional drying methods still rely on sunlight, which is time-consuming and weather-dependent. This study aims to design and develop an automatic prototype-scale roselle flower dryer. The system employs a K-type thermocouple, capacitive soil moisture sensor, and load cell, with a PTC air heater and fan as actuators, controlled by a closed-loop system. Validation was conducted through a calibration process for each sensor. The results showed an error of ±0.5% for the thermocouple, ±0.02% for the capacitive soil moisture sensor, and ±1% for the load cell. The system was able to increase the temperature from 28°C to 80°C within 1800 seconds and maintain its stability around the set-point. The sensors performed with good accuracy and sensitivity throughout the process. This tool effectively accelerates the drying process, producing dried roselle with more consistent quality that meets market standards.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bunga Rosela, Pengering, Sistem Kontrol, Termokopel, Capacitive Soil Moisture, Load cell. Roselle, Dryer, Control System, Thermocouple, Capacitive Soil Moisture, Load cell.
Subjects:	Q Science > QC Physics > QC271.8.C3 Calibration Q Science > QC Physics > QC271 Temperature measurements Q Science > QC Physics > QC320 Heat transfer
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Adhistana Maharani
Date Deposited:	15 Jul 2025 01:09
Last Modified:	15 Jul 2025 01:09
URI:	http://repository.its.ac.id/id/eprint/119719

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