Define temperatures at the machine
Plant temperatures are not automatically refrigerant temperatures. Heat exchangers require an approach difference, so evaporating temperature sits below the source and condensing temperature above the sink. These differences add to the compressor lift.
Reduce lift at both ends
Recover heat before it cools further. Separate low-temperature users from a high-temperature header. Increase exchanger area where justified. Review process setpoints and return temperatures rather than accepting them as fixed.
Use performance maps
Ask for capacity and electrical input across the proposed envelope, including part load and seasonal extremes. A single COP point cannot represent variable production.
Sources
General technical explanation. No specific external source claims are made on this page.