1996-07-01

Feasibility/Availability Study of Compressed Vapor Cycle Heat Rejection Systems 961563

A feasibility analysis on mechanically compressed vapor cycle systems is practiced in accordance with the laws of thermodynamics. The feasibility is mathematically expressed in three different factors: the expansion valve exit quality, the compressor effeciency, and the cooling efficiency. Numerical results are plotted in the figures to form illustrative feasibility diagrams; from which found are permissible combinations of the evaporation/condensation temperatures, the required compression ratio, and the required compressor efficiency. An evaporation temperature control method, coupled with the thermohydraulic analysis procedure, is then introduced for a space-borne heat pump system operating under off-design conditions. Control variables used in that method are the compression ratio and the compressor speed, requested values of which are graphically shown in the figures with parameters of interest. In addition to compressed vapor systems, this paper deals with pumped single/two-phase fluid ones. A computational approach based on analytical modeling is proposed for the heat rejection system trade-off study and has resulted in unified system/subsystem design procedures. Demonstrative examples of design calculations are explained with figures; displaying the liquid/vapor line diameters, the system weight breakdown, the specific weight, the specific power, and the compressor speed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Heat Losses from the Turbine of a Turbocharged SI-Engine - Measurements and Simulation

2004-01-0996

View Details

TECHNICAL PAPER

R744 Parallel Compression Cycle for Automotive Climate Control

2017-01-0175

View Details

TECHNICAL PAPER

Improving Energy Efficiency in Automotive Vapor Compression Cycles through Advanced Control Design

2006-01-0267

View Details

X