Pengaruh Variasi Putaran Mesin (Rpm) Dan Kedalaman Pipa Kapiler Termostat Evaporator Terhadap Koefisien Performa (COP) AC Mobil

Febry Bagus Setiawan (Universitas 17 Agustus 1945 Surabaya)
Aji Purna Irawan (Universitas 17 Agustus 1945 Surabaya)
Ninik Martini (Universitas 17 Agustus 1945 Surabaya)

Teknik: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer
Vol. 6 No. 2 (2026): Juli : Jurnal Teknik Mesin, Elektro dan Ilmu Komputer

The car Air Conditioning (AC) system plays an important role in maintaining cabin comfort, especially in tropical climates. Its performance is influenced by engine speed (RPM) and the installation position of the thermostat sensor capillary tube on the evaporator. This study analyzes the effect of RPM variation and sensor installation depth on the Coefficient of Performance (COP) of a 1300 cc Avanza car AC system using R-134a refrigerant through an experimental method. The results show that sensor position significantly affects system performance: a surface-mounted position causes icing, a 1 cm depth produces a lower COP, while a 2 cm depth provides the most optimal condition with stable temperature, balanced pressure, and the highest COP. Therefore, a 2 cm sensor depth is the most efficient condition for improving AC system performance