2023 ASHRAE TECHNOLOGY AWARDS 2023 ASHRAE TECHNOLOGY AWARDS FIRST PLACE CASE STTUDYUDY FIRST PLACE ASE RETRO-COMMISSIONING AND DIGITAL TRANSFORMATION OF MALL BY RAYMOND MAN HUNG YAU, PH.D., MEMBER ASHRAE; KWAI PING LAU, MEMBER ASHRAE T 50 he Cityplaza mall opened in 1983 and is the largest shopping mall on Hong Kong Island at 1.11 million ft2 (103 122 m2). With its ownership committed to Science Based Targets aligned with the 1.5ºC (2.7°F) pathway, energy performance was one of the main focuses for the team. By using retro-commissioning, a cloud-based smart energy management platform and application of a digital twin, the shopping mall's energy performance and indoor environment thermal comfort were improved. From 2018 to 2021, the mall reduced its energy consumption by 9%. ASHRAE JOURNAL ashrae.o rg A U G UST 2023https://ashrae.org/