Electronic Theses and Dissertation

Perubahan iklim dan ketergantungan pada sistem pendingin mekanis konvensional telah meningkatkan konsumsi energi dan emisi CO₂ di sektor perumahan Indonesia. Penelitian ini bertujuan mengkaji pengaruh variasi laju aliran udara (0,05; 0,06; 0,07; 0,08; dan 0,09 m³/s) terhadap unjuk kerja termal Earth Air Heat Exchanger (EAHE) dan konsumsi energi blower pada rumah tipe 36 di Gampong Kajhu, Aceh Besar. Eksperimen dilakukan selama 15 hari dengan pengambilan data suhu tanah (kedalaman 0,2–1,0 m), suhu udara inlet outlet EAHE, suhu ruang, serta daya dan energi blower antara pukul 09.00–17.00 WIB. Analisis meliputi efektivitas (ε), Number of Transfer Units (NTU), panas yang dibuang (qrejected), dan koefisien kinerja (COP). Hasil menunjukkan bahwa ε dan NTU rata rata meningkat hingga puncak pada laju aliran 0,08 m³/s, yaitu sekitar 0,87 dan 2,54 secara berturut-turut. Kemudian panas yang dibuang (qrejected) berbanding lurus dengan laju aliran, mencapai sekitar 648 W pada 0,09 m³/s. COP tertinggi diperoleh pada laju aliran 0,09 m³/s mencapai sekitar sebesar 5,9. Energi blower selama delapan jam operasi naik dari 0,352 kWh pada laju aliran 0,05 m³/s hingga 0,880 kWh pada laju aliran 0,09 m³/s, dengan biaya harian antara Rp 146 hingga Rp 365 dan biaya bulanan maksimum sekitar Rp 10.956, menunjukkan biaya operasional yang ekonomis. Dengan demikian, rentang laju 0,08–0,09 m³/s memberikan keseimbangan optimal antara penurunan suhu, efisiensi energi blower, kapasitas pendinginan, dan biaya operasional di iklim tropis lembap. Temuan ini mendukung implementasi EAHE sebagai solusi pendinginan pasif yang hemat energi dan rendah emisi untuk rumah sederhana di Indonesia.

Climate change and reliance on conventional mechanical cooling systems have increased energy consumption and CO₂ emissions in Indonesia's residential sector. This study aims to examine the effect of airflow rate variations (0.05, 0.06, 0.07, 0.08, and 0.09 m³/s) on the thermal performance of Earth Air Heat Exchanger (EAHE) and blower energy consumption in type 36 houses in Gampong Kajhu, Aceh Besar. Experiments were conducted for 15 days, with data collection on soil temperature (0.2–1.0 m depth), EAHE outlet and inlet air temperatures, room temperature, and blower power and energy between 09.00 and 17.00 WIB. The analysis includes effectiveness (ε), number of transfer units (NTU), heat discharged (qrejected), and coefficient of performance (COP). The results show that the average ε and NTU values increase to a peak at a flow rate of 0.08 m³/s, corresponding to approximately 0.87 and 2.54, respectively. Then the heat discharged (q_rejected) is directly proportional to the flow rate, reaching about 648 W at 0.09 m³/s. The highest COP was obtained at a flow rate of 0.09 m³/s, reaching about 5.9. The blower energy consumption during eight hours of operation increased from 0.352 kWh at a flow rate of 0.05 m³/s to 0.880 kWh at a flow rate of 0.09 m³/s, resulting in a daily cost ranging from Rp 146 to Rp 365 and a maximum monthly cost of approximately Rp 10,956, indicating an economical running cost. Thus, the rate range of 0.08-0.09 m³/s provides an optimal balance between temperature reduction, blower energy efficiency, cooling capacity, and operating costs in humid tropical climates. These findings support the implementation of EAHE as an energy-efficient and low-emission passive cooling solution for simple houses in Indonesia.