Complementary system converts subcooled liquid hydrogen or nitrogen to gas. The inherent induction heat losses of an electrical transformer are used in the vaporizing process. Transformer efficiency is improved in the process

Ketaily, E. C.

English

NASA Technical Reports Server

February 1966
	
Brief 66-10045 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Complementary System Vaporizes Subcooled Liquid,

Improves Transformer Efficiency 
Ground Connection
S Out 
Sub-Cooled 
Liquid In
3PhaseTransfcomer 	 -	
I 3 Phase	
Li çcton 
II I	 Ii ii	 II	 II	 II 
II 0.
Ground Connection 
Hermetically Sealed Compartment 
The problem: 
Certain test facilities require large quantities of 
gaseous hydrogen or nitrogen in their operation. These 
gases are normally stored in their subcooled liquid 
state and it is necessary to apply heat to convert them 
to the large gaseous volumes required. It is desirable 
to achieve this conversion as economically as feasi-
ble, preferably without conventional heat transfer 
media.
The solution: 
A complementary system that takes advantage of the 
inherent induction heat losses of an electrical trans-
former to convert the liquid to a gas. Transformer ef-
ficiency is improved in the process. 
How it's done: 
A parallel arrangement of three heat exchanger 
tubes is placed within the transformer enclosure in 
(continued ovcrlcaU 
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close proximity to the transformer core. The subcooled 
liquid to be vaporized is passed through the parallel 
paths of tubing from an inlet header to an outlet header 
where it emerges as gas vapor. Each tube is connected 
as a single phase load on the three phase transformer 
output. The compartment containing the tubing and 
transformer core is hermetically sealed to prevent 
moisture buildup on the tubing. 
Notes: 
1. Transformer efficiency is greatly increased and a 
given load may be handled with a much smaller 
core.
2. Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10045
 
Patent status: 
No patent action is contemplated by NASA. 
Source: Edward C. Ketaily 
of Nrth American Aviation, Inc. 
under contract to 
Marshall Space Flight Center 
(M-FS-550) 
Brief 66-10045	 Category 02


Complementary system vaporizes subcooled liquid, improves transformer efficiency

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