Paper Conference

Proceedings of ASim Conference 2016: 3rd Asia conference of IBPSA-China, Japan, Korea


Simple Thermal Energy Storage Tank for Improving the Energy Efficiency of an Existing Air-conditioning System

Kenta Maruyama, Gyuyoung Yoon, Takeshi Watanabe

Abstract: This study aims to improve the energy efficiency and reduce the operating time of an existing heating, ventilation, and airconditioning (HVAC) system by adding a simple thermal energy storage (TES) tank to it. A case study is conducted to evaluate the energy efficiency of the HVAC/TES system using numerical analysis. It is found that the proposed technology saves energy. Increasing the coefficient of performance of the heat-source equipment reduces its energy consumption by 54%. The energy of the primary pumps is reduced by 78% by shortening their operation time. This is achieved by turning off the heat-source equipment and the primary pump while the TES tank discharges heat. The HVAC/TES system is energy efficient. We assess the thermal capacity of a simple TES system and simulate its energy use. Furthermore, we analyze temperature distributions and examine the arrangement of phase-change materials using computational fluid dynamics analysis.
Keywords: Energy saving, Simple thermal energy storage tank, Improved driving efficiency, Latent thermal storage, Existing small-to medium-sized buildings