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Thermodynamic Modeling of Heat Engines Including Heat Transfer and Compression–Expansion Irreversibilities

Journal Article · · Journal of Thermal Science and Engineering Applications
DOI:https://doi.org/10.1115/1.4050786· OSTI ID:1809040
 [1];  [2];  [3];  [4];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Ingeniería Térmica Ltda., Medellín (Colombia); Fundación Ergon, Medellín (Colombia)
  3. Florida A & M University, Tallahassee, FL (United States)
  4. Florida State Univ., Tallahassee, FL (United States)
In this paper, a thermodynamic model based on an endoreversible engine approach is developed to analyze the performance of heat engines operating under different thermodynamic cycles. The model considers finite heat transfer rate, variable heat source and sink temperatures, and irreversibilities associated with the expansion and compression. Expressions for the maximum power and efficiency at maximum power output are obtained as a function of hot and cold reservoir temperatures, the equivalent isentropic efficiency of compression and expansion components, and the effective conductance ratio between heat exchangers. In all cases, the Curzon–Ahlborn efficiency is retrieved at constant reservoir temperatures and neglected compression–expansion irreversibilities. The proposed model allows assessing the effect of isentropic efficiencies and heat exchanger design and operation characteristics for different thermodynamic cycles.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1809040
Report Number(s):
NREL/JA--5700-78998; MainId:32915; UUID:bf020e28-1a64-4fba-999e-5cc6902aacbd; MainAdminID:25826
Journal Information:
Journal of Thermal Science and Engineering Applications, Journal Name: Journal of Thermal Science and Engineering Applications Journal Issue: 1 Vol. 14; ISSN 1948-5085
Publisher:
ASMECopyright Statement
Country of Publication:
United States
Language:
English

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