STUDY OF A NOVEL R718 TURBOCOMPRESSION CYCLE

Even though water (R718) is one of the oldest
refrigerants, state of the art technology is
required to use water as a refrigerant in
compression refrigeration plants with turbo
compressors. In regard to using water as a
refrigerant, some specific features complicate its
application in refrigeration plants with turbo
compressors. Because the cycle works at very low
pressure, the volumetric cooling capacity of water
vapor is very low. Hence, huge volume flows have to
be compressed with relatively high pressure ratios.
Therefore, the use of water as a refrigerant,
compared to classical refrigerants, requires
approximately 200 times the volume flow and about
twice the pressure ratio for the same applications.
To enhance the turbocompression and improve the
efficiency of R718 cycles, the novel concept of 3-
port condensing wave rotors integrated in R718
compression refrigeration cycles is investigated.
The condensing wave rotor employs pressurized water
to pressurize, desuperheat, and condense the
refrigerant vapor, all in one dynamic process.

Autorentext

Kharazi obtained his PhD in mechanical engineering at
Michigan State University. He is currently a mechanical engineer
at Jacobs, where he is involved in the design, commission, and
operation of automotive test facilities.In 2008, he received
Jacobs outstanding performance award. Kharazi has authored
several journal and conference papers.

Klappentext

Even though water (R718) is one of the oldest
refrigerants, state of the art technology is
required to use water as a refrigerant in
compression refrigeration plants with turbo
compressors. In regard to using water as a
refrigerant, some specific features complicate its
application in refrigeration plants with turbo
compressors. Because the cycle works at very low
pressure, the volumetric cooling capacity of water
vapor is very low. Hence, huge volume flows have to
be compressed with relatively high pressure ratios.
Therefore, the use of water as a refrigerant,
compared to classical refrigerants, requires
approximately 200 times the volume flow and about
twice the pressure ratio for the same applications.
To enhance the turbocompression and improve the
efficiency of R718 cycles, the novel concept of 3-
port condensing wave rotors integrated in R718
compression refrigeration cycles is investigated.
The condensing wave rotor employs pressurized water
to pressurize, desuperheat, and condense the
refrigerant vapor, all in one dynamic process.