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All Journal Research In Chemical Engineering Jurnal Polimesin
Indah Hartati
Universitas Wahid Hasyim
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Kinetics of Cucurbita Moschata Puree Drying with Maltodextrin as Drying Aid Indah Hartati; Salsa Erna Setiawati; Suwardiyono; Farikha Maharani; Safaah Nur Faizin
Research in Chemical Engineering Vol. 1 No. 1 (2022): March
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.954 KB) | DOI: 10.30595/rice.v1i1.7

Abstract

The objective of this research was to investigate the influence of maltodextrin addition of pumpkin puree drying as well as studied the drying kinetics. Several thin layer drying kinetics model comprised of Page, Lewis, Henderson Pabis, Two Term, Weibull as well as diffusion model were used to studied the behavior of pumpkin drying. The puree drying was conducted by added 15% of maltodextrin on pumpkin puree. The drying temperatures were varied of 60-70 The research result show that temperature influence the pumpkin puree drying in which added with maltodextrin as the drying aid. Pumpkin puree drying with addition of maltodextrin performed at temperature of 70 for 150 minutes is considered as the relatively suitable condition as it gives low moisture ratio of 0.07. The thin layer drying kinetics, Midili, give good fittest to the experimental data followed by Page and Weibull. The effective diffusivity is in range of m/s with the obtained activation energy is 30.36 kJ/mol.
Performance assessment of an R290 air conditioning system using hybrid ZnO–SiO₂ nanolubricant Agung Nugroho; Tabah Priangkoso; Muhammad Alaik Amirullah; Indah Hartati; Fatna Nur Hidayah; Kofi Ampomah Benefo
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8924

Abstract

This study investigates the performance of a split air conditioning system using hybrid ZnO–SiO₂ nano lubricant with R290 refrigerant. Experiments were conducted under steady-state conditions at an ambient temperature of 27 ± 1°C with a constant cooling load. Nano lubricant concentrations of 0.18%, 0.36%, 0.91%, 1.79%, and 2.67% by mass were prepared using a two-step dispersion method involving mechanical stirring and ultrasonic agitation. System performance was evaluated based on energy consumption and Coefficient of Performance (COP). The results show that the addition of ZnO–SiO₂ nano lubricant improves system performance at optimal concentrations. The highest performance was observed at concentrations of 0.36% and 0.91%, resulting in an energy consumption reduction of approximately 9.7% compared to pure lubricant. The maximum COP value of 2.77 was obtained at a concentration of 0.91%. However, further increases in nanoparticle concentration led to performance degradation due to increased viscosity and particle agglomeration, which negatively affected compressor work and heat transfer. These findings indicate that the application of ZnO–SiO₂ nano lubricant can enhance the energy efficiency of air conditioning systems when applied at optimal concentrations.
Co-Authors Agung Nugroho Farikha Maharani Fatna Nur Hidayah Kofi Ampomah Benefo Muhammad Alaik Amirullah Safaah Nurfaizin Salsa Erna Setiawati Suwardiyono Tabah Priangkoso