Courtyard by Marriott

Courtyard by Marriott:  EET Deployed and validated savings on all equipment at this Crystal City VA location.

Performance Results from the Demo The average key performance indicators (KPI’s) measured across all the equipment tested using the International Performance & Measurement Verification Protocols (IPMVP) are very consistent with our historical improvements for 15-year-old units, as well as the performance loses predicted by the American Society of Heating, Refrigeration & Air-Conditioning Engineers (ASHRAE).

The average energy use reductions measured directly at each piece of equipment using data loggers is also very consistent on average with both our historical averages and the IPMVP results, thus corroborating both sets of data.

Power Logging Testing Methodology
As a secondary collection methodology, the Tri-S and EET team logged power usage for each of the three pilot RTUs and chiller over similar baseline and post periods that had nearly identical weather days. With 7,200 baseline and post comparison data points taken at 1-minute intervals, the team then compared average power use data during these entire periods. Marriott provided occupancy data to the team for both the sleeping rooms and the function spaces so we could ensure the building loads were also consistent during the same 5 comparison days used for each unit.
The summary analysis of all the RTU power data yielded the results shown in the detailed charts below for the kitchen RTU. As you can clearly see in the two graphs, the total energy use dropped noticeably in the Post period versus the Baseline. This drop in top-end amp use is mainly due to improvements in compressor operation. The longer-term average post amps drop is more related to the increased capacity and improved heat transfer ability of the evaporator and condensing coils. This improvement allows the RTUs to reach set points faster and shut off for slightly longer periods of time. This drops the overall amount of energy being consumed and ultimately presents itself in the form of lower future power bills.

Here's how this savings compares to other hotels validated (and over a thousand other machines validated, which is the average by age curve in green below):