Analytical and experimental investigation of two-phase flow screw expanders for power generation

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · J. Eng. Gas Turbines Power; (United States)

DOI:https://doi.org/10.1115/1.3240182· OSTI ID:5779581

Taniguchi, H; Kudo, K; Park, I; Kumazawa, S

An analytical procedure for calculating the performance of a two-phase flow screw-type expander is presented. Predicted results are compared with experimental measurements made with a recently developed prototype expander. This expander was designed for investigating the applicability of this type of machine as the expansion device in refrigeration or heat pump cycles with the objective of taking advantage of the power-producing capability of the expanding fluid. It has two rotors each with a diameter of 81.6 mm and a length of 135 mm, and was operated with Freon-12 entering at a pressure of 1.588 MPa (230.4 psia) and subcooling of between 2 and 12 K. Maximum power generated was 10 kW at a rotor speed of 3000 rpm. The internal (machine) efficiency is predicted to increase from about 30 to 70 percent as the rotor speed increases from 500 to 3000 rpm. Experimental results over the same speed range increase from 30 to 60 percent. The low experimental values at the higher rotor speeds are attributed primarily to frictional losses not included in the analysis. Estimates of the performance of machines with larger diameter rotors yielded internal efficiencies reaching 80 percent and increases in power output proportional to the square of the rotor diameter.

• Research Organization: Hokkaido Univ., Sapporo (Japan); Mayekawa Manufacturing Co., Ltd., (MYCOM) Tokyo, 135 (JP)
• OSTI ID: 5779581
• Journal Information: J. Eng. Gas Turbines Power; (United States), Vol. 110:4
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
42 ENGINEERING
HEAT PUMPS
PERFORMANCE
HELICAL ROTARY SCREW EXPANDER
TWO-PHASE FLOW
ANALYTICAL SOLUTION
CALCULATION METHODS
DESIGN
ENERGY EFFICIENCY
EXPERIMENTAL DATA
POWER GENERATION
REFRIGERATION
ROTORS
WORKING FLUIDS
COOLING
DATA
EFFICIENCY
FLUID FLOW
FLUIDS
INFORMATION
NUMERICAL DATA
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
420400 - Engineering- Heat Transfer & Fluid Flow