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RESEARCH PAPERS

Multiplication of LNG Cold to Produce Refrigeration at 273 K

[+] Author and Article Information
G. Best Brown

Centro de Investigación de Materiales, National University of Mexico, Apartado Postal 70-360, Cd. Universitaria, México 20, D.F., Mexico

J. Eng. Ind 97(3), 915-920 (Aug 01, 1975) (6 pages) doi:10.1115/1.3438703 History: Received July 25, 1974; Online July 15, 2010

Abstract

It is becoming of great importance to develop processes which can utilize the “available cold” of LNG and thus recover the energy used for its liquefaction. It is possible to evaluate the amount of refrigeration that could be produced reversibly Q1 , at a temperature T1 , from the amount of cold available, Q2 , at a lower temperature, T2 , in an environment at T0 . This is:

Q1Q2 ≤ T0 − T2T0 − T1 · T1T2
For LNG it would be obtained that:
Q1Q2 ≤ 13.5
Work is being done to develop cold multiplication cycles which would approach this ideal figure. Among the systems under development is an absorption process resembling a reversal of the well-known absorption refrigerator. An ethane-neoheptane system is presented for which the multiplication factor has been around 1.8 and the efficiency of around 17 percent. The irreversibilities of the cycle and the low enthalpy of mixing of hydrocarbons are the main reasons for the relatively low cold multiplication factor and thermodynamic efficiency.

Copyright © 1975 by ASME
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