This paper presents field analyses on the influences of condenser and evaporator approach temperatures of water cooled air conditioning system for a shopping mall. The mall building comprises food and non-food retail stores and uses a centralized air conditioning (AC) system to condition the entire building. The AC system comprises three chillers with the same cooling capacity. Chillers’ performance parameters included power consumption, condensing and evaporating temperatures, evaporator-condenser approach temperatures, pressure drop and cooling capacity parameters were hourly recorded for a period of one year. Performance characteristics of each chiller were evaluated at different condenser and evaporator approach temperatures and regression analyses were also established to examine the correlations and influences of the approach temperatures on the chillers’ performance. The analyses results showed that the increase of condenser approach temperature could increase the power consumption and reduce the coefficient of performance (COP) of the chillers. While evaporator approach temperature was found to have insignificant effect to the chiller performance. The results also showed that for the investigated chillers with condenser and evaporator approach temperatures maintained below 2 K, the approach temperatures had negligible correlation to the power consumption and the overall performance of the chillers. At this operational conditions, the water cooled air conditioning systems could operate at their best possible performance.
Obyek wisata air terjun Tibu Blemantung yang lokasinya di desa Pujungan Pupuan, mulai dikenal dan berkembang. Banyak wisatawan domestik dan mancanegara yang berkunjung. Ada pura dan bale bengong di area air terjun. Kondisi sebelumnya, jalan menuju objek wisata yang cukup jauh, belum ada sumber listrik yang terpasang untuk penerangan di area tersebut. Hal tersebut menjadi penekanan pada program pengabdian ini. Pelaksanaan pengabdian kepada masyarakat ini, selain melibatkan segenap staf Jurusan Teknik Mesin Politeknik Negeri Bali, juga masyarakat desa Pujungan Pupuan terlibat langsung dalam kegiatan ini. Hasil-hasil dari kegiatan ini, berupa sambungan baru PLN untuk power outlet dan penerangan di area pura dan bale bengong. Bangungan gapura akses masuk dan betonisasi jalur traking menuju area wisata air terjun. Jalan masuk ini memperpendek jalan menuju lokasi wisata air terjun. Dan air terjun buatan untuk menambah jumlah dan keindahan air terjun yang ada.
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