Gray-box entropy-based model of a water-source NH3-H2O gas-driven absorption heat pump

- A GAX absorption heat pump is modeled using a gray-box entropy-based approach.
- The aim is to predict the behavior at variable loads and hot water temperature increases.
- After calibration against experimental data, an accuracy of 2% is achieved.
- The model is fast computing and easy to implement in year-round energy simulations.