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Title Investigation of an ejector heat pump by analytical methods
Creator/Author Hsu, C.T.
Publication Date1984 Jul 01
OSTI IdentifierOSTI ID: 6890823; DE84016675
Report Number(s)ORNL/CON-144
DOE Contract NumberAC05-84OR21400
Resource TypeTechnical Report
Research OrgOak Ridge National Lab., TN (USA)
Subject320100 -- Energy Conservation, Consumption, & Utilization-- Buildings; ;HEAT PUMPS-- EFFICIENCY; COEFFICIENT OF PERFORMANCE;DESIGN;GEOMETRY;MASS TRANSFER;NOZZLES;OPERATION;REFRIGERANTS
Related SubjectFLUIDS;MATHEMATICS;WORKING FLUIDS
Description/Abstract Using existing theories of ejector design, the optimum geometry of a high-efficiency ejector - including mixing section cross-sectional area, mass flow entrainment rate, ejector efficiency, and overall COP - for a heat pump cycle was determined.^A parametric study was performed to evaluate the COP values for different operating conditions.^A sensitivity study determined th effects of nozzle efficiency and diffuser efficiency on the overall ejector heat pump COP.^The off-design study estimated the COP for an ejector heat pump operating at off-design conditions.^Refrigerants 11, 113, and 114 are three of the halocarbons which best satisfy the criteria for an ejector heat pump system.^The estimated COPs were 0.3 for the cooling mode and 1.3 for the heating mode at standard operating conditions: a boiler temperature of 93.3/sup 0/C (200/sup 0/F), a condenser temperature of 43.3/sup 0/C (110/sup 0/F), and an evaporator temperature of 10/sup 0/C (50/sup 0/F).^Based on the same operating conditions, an optimum ejector geometry was estimated for each of the refrigerants R-11 and R-113.^Since the COP values for heating obtained in this analysis are greater than unity, the performance of an ejector heat pump operating in the heating mode should be competitive with that of oil- or gas-fired furnaces or electrical resistance heaters.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 63
AvailabilityNTIS, PC A04/MF A01.
System Entry Date2001 May 13

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