ANALISIS ENERGI BANGUNAN HOTEL NOVOTEL YOGYAKARTA DENGAN SISTEM PENGKONDISIAN UDARA VARIABLE AIR VOLUME MENGGUNAKAN ENERGYPLUS

As a commercial entity that operates 24 hours, energy efficiency is required in hotels in order to minimize the building energy consumption. One of the strategies is by modifying the building air conditioning system, given the fact that it consumes the largest amount of electricity. Modification on the air conditioning system that has been done in this research is by replacing the current Constant Air Volume (CAV) system with the Variable Air Volume (VAV) system. It consists of a VAV terminal unit which functionalizes to control the air volume being distributed into the spaces known thermal zones. The building observed is Novotel Hotel in Yogyakarta. This research is based on computer simulation using EnergyPlus software compute the energy efficiency obtained by the use of VAV system. The data input required are the building geometry, weather data, and the building cooling loads. First stage of the simulation is creating the computer model using Google SketchUp 8 with an Open Studio 1.0.10 module. The next stage is the energy simulation utilizing EnergyPlus 8.0.0.008, followed with the analysis. Results have shown that the total energy consumption of the first floor Novotel Hotel Yogyakarta is 2508.33 GJ per year with 45.22% allocated for AC, 44.76% for lighting, and 10.02% for other utilities. Furthermore, the Energy Consumption Intensity (IKE) is 433.012 kWh/m 2 per year. By comparing the energy consumption of both system, CAV and VAV, it can be concluded that applying VAV to the AC system has gained energy efficiency up to 4.58%