Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Please do not list out all the curves. It is as if you are not even familiar with what each curve means.
Among curves, Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve would be the most imactful.
The second would be Energy Input Ratio Modifier Function of High/Low Temperature Curves, but I think it does not change that much from product to product.
In my experience, Minimum Heat Pump Part-Load Ratio is even more important than the above. When the heat pump operates at a PLR below this value, the heat pump’s compressor will cycle to meet the cooling or heating demand, which means that the all the Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve values below the Minimum Heat Pump Part-Load Ratio are ignored and the Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve value at the Minimum Heat Pump Part-Load Ratio is used. The larger Minimum Heat Pump Part-Load Ratio will increase the part load efficiency a lot. It's 0.15 by default, 0.1 or less in recent products, and the old value of 0.25 is often used in poorly researched papers.
