Study and Analysis of an Electrical Energy Saving Strategies and Gas Emissions Reduction for a Private Hospital Building in Yemen

Abstract

Hospital buildings consume high energy more than other buildings in the commercial buildings sector as there is a continuous demand for power  supplies. Energy consumption and greenhouse gas emissions can be reduced in the buildings sector by using various energy saving methods. In this study, on-sight visiting for energy audit has been conducted at a private hospital in Sana’a - Yemen to record all data relevant to energy consumption by equipment, machines, and all other mechanical systems. Different energy saving scenarios were using to estimate the potential of energy saving such as using high-efficiency lighting devices, raising the thermostat set point temperature for air conditioners, using high-efficiency motors (HEM) with a different load ratio, and using variable speed motors (VSM). Results indicated that energy consumption for the hospital was 4,061.8 Megawatthourper year whereas energy intensity was 232 kWh/m2. It is found that about 150.32 megawatt-hours of annual energy saving is achieved by using HEM and 689.72 Megawatt-hour per year by raising the set point of air conditioners thermostat to 26 °C. In addition, 1513 megawatt-hours per year of energy can be saved by reducing the VSM speed to 60% whereas95.8 megawatt-hours per year is estimated by adopting 100% load of HEM. The economic study of energy saving strategies was found that the use of HEM is not economically viable, while the use of VSM with large capacity motors is better from economic and environmental points of view. Keywords: Hospital building, energy consumption, Energy index, Energy saving, Emission reduction