Researchers, Developers, Partners…

Original Cryodata software products (GASPAK, HEPAK, METALPAK, CPPAK and EXPAK) are based on standard reference data from NIST (US government’s National Institute of Standards and Technology) and other internationally recognized sources and publications. The programs have now been transferred to Horizon Technologies for maintenance and further development. These applications are built for Windows Operating Systems, although they may be portable to other computing environments using source code or dynamic link libraries.

Cryodata partners and program authors have developed international reputations during their time at NIST or at other respected scientific organizations or universities. Cryodata customers within the US include major NASA and DOE laboratories, universities, and large corporations. Outside of the US, software products have been delivered to private and public companies and to governmental agencies. The extent of customers using these products for the past 25 years is one of the best measures of the worldwide recognition given to the Cryodata computer programs.

Cryodata partners

Robert D. McCarty, formerly of the Fluids Properties Group at NIST, was principal developer of the computer program “MIPROPS” which calculated properties of 12 different fluids. MIPROPS was widely distributed within the cryogenic engineering community during the 1980’s; it has now been updated and is distributed by the NIST Office of Standard Reference Data as the NIST-12 standard reference program for fluid properties and the initial foundation of the NIST REFPROPS program. He is the author of several dozen NIST publications on fluid properties, one of the original Cryodata partners, and coauthor of GASPAK and HEPAK computer codes. Bob lives in Grand Junction, Colorado, and can be reached via e-mail:

Dr. Vincent Arp was educated at Berkeley and is retired from the NIST cryogenic systems group in Boulder, Colorado. He is the author of several dozen NIST publications on solid and superconducting material properties, helium heat transfer studies in support of superconducting systems, and the application of MIPROPS and other fluid properties subroutines to engineering applications. He was an original Cryodata partner, and is a coauthor of GASPAKHEPAKSTEAMPAK (since retired with recommendation that those interested in steam properties look at the latest NIST package for steam), and METALPAK, CPPAK,and EXPAK computer codes. Vincent lives in Boulder, Colorado, and can be reached by e-mail:

V. Arp and R. McCarty … recipients of prestigious Mendelssohn Award!

We are proud to have the opportunity to work with Cryodata founders Vincent Arp and Robert McCarty, recipients of the Mendelssohn award at the International Cryogenic Engineering Conference in Bournmouth, England on July 17, 1998. The award was “…to honour your long lasting and outstanding contributions for developing data base codes for cryogenic fluids and processes, well in use worldwide now…“. We feel that this award also respects the high technical quality software products developed by Cryodata. Professor Mendelssohn was a major contributor to the world knowledge of helium, metal, and superconductor properties in the 1940’s through the 1970’s. Cryodata has since been dissolved as a business entity.

Dr. Jeffrey Fox worked in NIST’s Fluid properties group for a number of years, with a specialty of critical point thermodynamics. He developed strong capabilities in advanced computer languages and mixed-language programming. He is a former Cryodata partner, and has specialized in program interface development. He is a coauthor of GASPAK and HEPAK.

Dr. Yonghua HUANG is an Professor at the Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, China. He has been working on cryogenic fluid properties, cryocooler modeling and other cryogenic engineering projects for many years. He worked with Cryodata staff members since 2003 and is now a collaborator with Horizon Technologies. Dr. HUANG can be reached by email:

Additional Program Authors and Consultants

Dr. Jay Theilacker was head of the Cryogenics group at Fermi National Laboratory. He worked closely with Cryodata staff members on creating the initial versions of the Excel spreadsheet environment for using the HEPAK and GASPAK codes.

J.G. Hust retired from NIST’s cryogenic materials group where he studied properties of metals. He contributed to Cryodata’s CPPAK and EXPAK computer codes, and consulted on other solid properties programs.