Analyses of hvac systems for a sample building

Abstract

Growing population and increasing industrialization result in rising energy generation demand which is accompanied by the increasing rate of depletion in energy sources and emission of greenhouse gasses in the world. Development of higher energy efficient systems and utilization of renewable energy sources can be regarded as the main solutions against the unfavorable effects of energy generation. It is known that energy consumption in buildings constitute a considerable fraction of total energy consumption of countries. Hence, performing the energy analysis and use of energy efficient systems in buildings have the corresponding importance. In this study, by selecting a sample hotel building in Istanbul, three different HVAC systems are compared in terms of economical aspects. These systems are: A) VRF+Boiler, B) Chiller+Boiler, C) Absorption heat pumps based HVAC systems. Insulation requirement and fresh air changes are computed according to the related standards and device dimensions are determined by means of Carrier HAP program. Devices are selected from manufacturer catalogues and energy simulation of the model building is carried out. Operational and installation cost for the considered energy systems are computed and payback time for each system is determined. Cash flows are determined for the life cycle of systems by using the present value method (NPV). From the economic perspective, System B is the cheapest and System C is the most expensive systems in installation cost. In operational expenses, the most expensive one is System A and the most affordable system is System C. It is seen that although the installation of System C is the highest, it is more profitable than System A with seven years of payback time.