Heat Pump
Design Model

Welcome to the DOE/ORNL Heat Pump Design Model on the Web.
Mark VII Version

The DOE/ORNL Heat Pump Design Model is a research tool for use in the steady-state design analysis of air-to-air-heat pumps and air conditioners.

The WEB version has an HTML-based input interface which generates the required input text file, executes the FORTRAN application, and summarizes the results on your Web browser.

As this is a hardware-based model, the user can specify the heat exchangers and air flows and select a compressor. The flow control devices may be specified or sized by the program based on desired conditions leaving the heat exchangers. The program analyzes steady-state performance for indoor and outdoor air conditions provided by the user. An example case is provided.

The Web version also has parametric analysis capability. A variety of performance trends can be viewed for a range of operating or design variables.

NEW!  Desktop PC Version of Enhanced Mark VII HPDM with Excel Input Data Key and Template

NEW!  Flex Version of HPDM for Modeling a Wide Range of Heat Pump Configurations

NEW!  Available ORNL Building Technology Design and Analysis Tools

NOTE!  To rerun html files that were saved before mid-Sept 2015, users will need to edit these files by replacing instances of with Files saved after mid-Sept 2015 should be reusable w/o any changes to the html file. We apologize for this inconvenience. (9/2015)

Revisions to Mark VII Web Model (7/2013)

Mark VII Model Improvements

Capabilities of Mark VI Web Model

Earlier Web Interface and Feature Improvements

SPECIAL NOTE!  The Mark VII Web model is down temporarily due to a required change to a more secure server which has resulted in an extended outage. We apologize for the inconvenience and are working to resolve the various issues that have arisen. An alternative Mark VII option is to use the new downloadable desktop version that we have recently made available in one of the links above. For users with saved Web data sets, you can extract the input data from the web files by viewing them in source mode on your browser or in a text editor, going down to around line 360 or so, finding the first line after <input type=..., and copying the text from there to just above the next <input type=... line. This text can be used as the HPDATA.DAT file for the desktop PC version. Once we have the Web input interface operational again, you can also, from the expert user page, save the resulting text input file in the window to your PC and run the case with the provided desktop version, if desired.

The other option is to use the new Flex HPDM model available online or downloadable from the second new link above. This model can handle a wide range of configurations as can been seen in the provided examples.

Please send comments/suggestions on the Web version to Bo Shen at Oak Ridge National Laboratory.

For more information on this and related ORNL heat pump models:

This program was developed by Oak Ridge National Laboratory (ORNL), Building Technologies Research and Integration Center (BTRIC) under sponsorship of the Department of Energy (DOE) Office of Building Technologies.

Since August 21, 1998,
The Web model has been run 326673 times.

The Web version was last revised on August 2, 2013.
This page was last updated August 2, 2013.