Accession Number : AD0782904

Title :   Proof-of-Principle Study of the D-Cycle - A Thermodynamic Cycle using Mechanical Compression of a Condensable Vapor.

Descriptive Note : Final rept. Jun 72-Dec 73,


Personal Author(s) : Davoud,John G.

Report Date : FEB 1974

Pagination or Media Count : 102

Abstract : In the D-Cycle, a condensing vapor cycle, there is the potential for improved efficiency in power systems. The contract calls for a feasibility study of the D-Cycle using an organic vapor. The working substance must possess the right thermodynamic characteristics; and the attainment of equilibrium between injected liquid and hot vapor must be fast as determined by the time-frame of the compression stroke in a reciprocating engine. The chosen working fluid is 2-2-2 trifluoroethanol, CF3CH2OH, 85% mol-fraction with 15% mol-fraction of water - known as Fluorinol 85 or F 85. A high pressure pump was developed with variable stroke mechanism. Injection of liquid in mist form into vapor at constant volume is accompanied by temperature decrease and pressure increase under the conditions used. State points at minimum and maximum pressures were determined for dry vapor during compression in a motored reciprocating compressor. The D-Cycle depends on a difference between work of expansion at high temperature and reduction of compression work by injection of liquid. The observed results indicate the feasibility of the cycle using F 85 based on published thermodynamic data.

Descriptors :   *Thermodynamic cycles, *Condensation, *Compression, *Pumps, Injectors, Vapor phases, Fluids, High pressure, Feasibility studies, Thermodynamics, Experimental design, Laboratory equipment, Alcohols, Electric generators, Engineering drawings, Performance(Engineering)

Subject Categories : Non-electrical Energy Conversion
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE