Potential energy saving with high at chilled water designs compared to the conventional low at design for office buildings

Abstract

This thesis investigates the potential energy saving benefits associated with high delta T chilled water designs compared to conventional low delta T designs in office buildings. This high delta T requirement specified in the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 90.1: 2016 under subsection 6.5.4.: “Chilled Water coil selection and theoretical background of temperature difference towards energy efficiency”. The aim of the study is to evaluate the capital cost reduction and annual energy savings achievable through the implementation of high delta T configurations and finally identify the applicability in tropical countries. The study followed a comprehensive research methodology that involved analysing 03 chilled water delta T options and assessing their impact on capital costs and energy consumption. The findings of the study demonstrate a significant cost savings and energy efficiencies associated with high ΔT chilled water designs. A total capital cost reduction of 2.8% for the ΔT=7°C system and 3.6% for the ΔT=8.3°C system was observed compared to the conventional ΔT=5°C system. Additionally, the annual energy analysis revealed a 0.97% reduction in energy costs for the ΔT=7°C system and a higher energy cost saving of 1.93% for the ΔT=8.3°C system compared to the ΔT=5°C system. These findings highlight the potential benefits of adopting high delta T chilled water designs in office buildings. The results not only demonstrate cost-effectiveness but also underscore the importance of energy efficiency and sustainability in building design and operation. The outcomes of this study contribute to the existing body of knowledge in the field and provide valuable insights for building professionals and stakeholders seeking optimal cooling system solutions. By embracing high delta T designs, practitioners can achieve tangible benefits in terms of reduced capital expenditures and ongoing energy consumption, leading to a more sustainable and economically viable built environment. Keywords: Energy efficiency, high delta T, chilled water, office building, tropical country