Volumetric Heating Capacity (VHC) Regression Parameters for 48 Refrigerants

This repository provides the fourth-order Hamilton-Allen regression parameters for calculating the volumetric heating capacity (VHC) of 48 refrigerants as a function of heat source and sink temperatures. The parameters are derived from the study:
Large-Scale Heat Pumps: Development of a Broadly Applicable, Easy-to-Use Heating Capacity Model

Jesper, Mateo; Hoffmann, Chris René; Pag, Felix; Vajen, Klaus; Jordan, Ulrike

Preprint available at: http://dx.doi.org/10.2139/ssrn.5082708

The regression model enables simple, accurate, and broadly applicable estimates of VHC for large-scale heat pump applications, including district heating and industrial processes. The parameters are validated with a coefficient of determination (R²) exceeding 0.998 for all refrigerants, ensuring high reliability for preliminary design and feasibility studies.

Key Features:
- Coefficients for fourth-order Hamilton-Allen polynomial models (Eq. 9 in the paper) for each refrigerant.
Parameters cover a wide range of operating conditions, defined by heat source and sink temperatures within the constraints outlined in the study.
- Data for 48 refrigerants, including conventional and low-GWP (Global Warming Potential) options.

Applications:
- Suitable for preliminary design, feasibility assessments, and comparative analyses of heat pump systems.
- Complements COP (Coefficient of Performance) regression models for complete heat pump modeling.

Assumptions and Limitations:
- The model assumes fixed superheating (7 K) and subcooling (1 K).
- Isentropic compressor efficiency is assumed to be ideal for simplicity.
- Errors may arise if real-world conditions deviate significantly from these assumptions (see Section 4.5 of the paper for sensitivity analysis).