Browse Prior Art Database

Miniature Cooling Machine

IP.com Disclosure Number: IPCOM000118094D
Original Publication Date: 1996-Sep-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 79K

Publishing Venue

IBM

Related People

Abraitis, V: AUTHOR [+3]

Abstract

Disclosed is a highly efficient and reliable cooling machine that may be fabricated in very small dimensions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 94% of the total text.

Miniature Cooling Machine

      Disclosed is a highly efficient and reliable cooling machine
that may be fabricated in very small dimensions.

      Fig. 1 shows the suggested Cooling Machine in a basic
packaging.  There are three layers in which a working gas is
compressed and expanded, realizing a thermodynamic cooling cycle.  In
the middle, the gas flows from the Hot to Cold End and vice versa in
the two outer layers in a closed circulation with highly efficient
counterflow heat exchange between the layers.

      Both the compression and the expansion occur through cascades
of pump elements, realizing a stepwise increase and decrease of
pressure, respectively.  Fig. 2 shows the construction of the pump
elements in more detail.  The movement of the membranes and valves is
controlled through magnetic interactions, using coils located outside
the body shown in Fig. 1.

      In the compression cascade, the pump elements are driven by an
oscillating magnetic field.  This realizes an isothermal gas
compression with heat ejection.  In contrast, the expansion cascade
works as an expansion engine.  Here the expanding gas flow drives the
membranes of  the pump elements, whereby electrical power is
generated in the outer coils.  This realizes a cool down through
adiabatic expansion.

      Because the gas is compressed and expanded over many small
steps in the cascades, it maintains nearly thermal equilibrium
through the whole cycle.  As is known fro...