Retro-commissioning is the process of commissioning an existing building controls to regain efficiency. This would involve fine-tuning the programming of the building controls.
As a building ages, there are many minor issues accumulate over the years, such as
These issues imply that the original design commissioned becomes less efficient. Hence, there is an opportunity to use
There are many energy saving opportunities that would require no additional capital expenses, for example (Source: EMSD HK),
There are also opportunities that would require additional sensors, for example occupancy sensors, energy meter and smart thermostats.
As the equipment replacement, maintenance and usage pattern would change over time, constant retro-commissioning would be required for energy efficiency.
Continuous commissioning is the process of performing on-going retro commissioning. This is made possible by continuously gathering data from the running system and an associated analytics platform for revealing the energy saving opportunities.
The saving from a retro commissioning exercise varies with buildings and their existing controls with a typical payback period of 2 years.