SIMULASI DESAIN POMPA GELEMBUNG UNTUK SISTEM PENDINGIN ABSORPSI

MUHAMAD RAFA PUTRA LUBIS, . (2025) SIMULASI DESAIN POMPA GELEMBUNG UNTUK SISTEM PENDINGIN ABSORPSI. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

	Text COVER.pdf Download (646kB)
	Text BAB I.pdf Download (287kB)
	Text BAB II.pdf Restricted to Registered users only Download (575kB) | Request a copy
	Text BAB III.pdf Restricted to Registered users only Download (484kB) | Request a copy
	Text BAB IV.pdf Restricted to Registered users only Download (1MB) | Request a copy
	Text BAB V.pdf Restricted to Registered users only Download (366kB) | Request a copy
	Text DAFTAR PUSTAKA.pdf Download (211kB)
	Text LAMPIRAN.pdf Restricted to Registered users only Download (1MB) | Request a copy

Abstract

Sistem pendingin absorpsi adalah alternatif berkelanjutan untuk refrigerasi konvensional, namun kinerja pompa gelembung sebagai komponen sirkulasi pasif masih terkendala oleh pemahaman kuantitatif yang terbatas tentang hubungan antara parameter desain dengan pola aliran multifase dan efisiensi pemompaan. Penelitian ini mengembangkan model Computational Fluid Dynamics (CFD) menggunakan OpenFOAM dengan solver InterCondensatingEvaporatingFoam untuk mensimulasikan aliran multifase dalam pompa gelembung, yang dibandingkan dengan perhitungan korelasi empiris airlift pump Reinemann menggunakan Python dan hasil kedua simulasi divalidasi dengan eksperimen. Simulasi dilakukan dengan variasi submergence ratio (SR: 54%, 62%, 70%) dan temperatur (55°C, 60°C, 65°C) menggunakan air dengan input panas 300 Watt. Model CFD berhasil mereplikasi empat pola aliran (Mist, Bubbly, Churn, Annular) dengan konvergensi stabil. Konfigurasi optimal diperoleh pada SR 70% dan 65°C, menghasilkan laju aliran massa total 0,037 kg/s dan efisiensi 0,07%. Laju aliran gas mencapai puncak pada 60°C (2,45×10⁻⁵ kg/s), menunjukkan hubungan non-linear antara temperatur dan produksi uap. Validasi menunjukkan hasil CFD 15–35% lebih tinggi karena asumsi adiabatik 2D, sementara korelasi empiris memberikan prediksi intermediet dengan deviasi 15–25%. Penelitian ini membuktikan bahwa desain pompa gelembung efektif memerlukan keseimbangan optimal antara gaya apung uap, pergerakan massa cairan, friction loss, dan perpindahan panas, serta menunjukkan bahwa integrasi CFD dan korelasi empiris efektif untuk optimasi desain pompa gelembung pada sistem pendingin absorpsi. Kata Kunci : Aliran Multifase, Computational Fluid Dynamics, OpenFOAM, Pompa Gelembung, Sistem Pendingin Absorpsi. ***** Absorption cooling systems are a sustainable alternative to conventional refrigeration, but the performance of bubble pumps as passive circulation components remains limited by a lack of quantitative understanding of how design parameters affect multiphase flow patterns and pumping efficiency. This study develops a Computational Fluid Dynamics (CFD) model in OpenFOAM using the InterCondensatingEvaporatingFoam solver to simulate multiphase flow in a bubble pump, with comparisons to empirical airlift pump correlations based on Reinemann calculations in Python, and both simulation results validated against experimental data. Simulations were conducted with variations in submergence ratio (SR: 54%, 62%, 70%) and generator temperature (55°C, 60°C, 65°C) using water as the working fluid and a heat input of 300 Watts. The CFD model successfully reproduced four characteristic flow regimes (Mist, Bubbly, Churn, Annular) with stable convergence. The optimal configuration—SR 70% at 65°C—yielded the highest total mass flow rate of 0.037 kg/s and a pump efficiency of 0.07%. Gas mass flow rate peaked at 60°C (2.45×10⁻⁵ kg/s), indicating a nonlinear relationship between temperature and vapor generation. Validation shows that CFD results are 15–35% higher due to idealized 2D adiabatic assumptions, while empirical correlations yield intermediate predictions with 15–25% deviation. This study demonstrates that effective bubble pump design requires an optimal balance of vapor buoyancy, liquid circulation, friction losses, and heat transfer, and highlights the value of integrating CFD and empirical correlations for bubble pump optimization in absorption cooling systems. Keywords : Absorption cooling system; Bubble pump; Computational Fluid Dynamics; Multiphase flow; OpenFOAM. *****

Item Type:	Thesis (Sarjana)
Additional Information:	1). Dr. Darwin Rio Budi Syaka, S.T., M.T. 2). Dr. Eng. Agung Premono, M.T.
Subjects:	Teknologi dan Ilmu Terapan > Teknik Mesin, Mekanika Teknik
Divisions:	FT > S1 Teknik Mesin
Depositing User:	Muhamad Rafa Putra Lubis .
Date Deposited:	15 Dec 2025 03:14
Last Modified:	15 Dec 2025 03:14
URI:	http://repository.unj.ac.id/id/eprint/62823

Actions (login required)

View Item