Thermal system parameter optimization method

• Main Author: CHEN ZESHAO
• Format: Patent
• Language: English
• Published: 16.09.2015
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention brings forward a thermal system parameter optimization method, and relates to selection of cycle parameters, optimum efficiency, optimum output power and heat exchanger parameters of a heat engine working between a high heat source and a low heat source. The method is characterized in that by use of a simplified limited time thermal analysis method, through a stationary-state endoreversible cycle heat engine model, by direct use of a heat flow rate equation, a heat-transfer flow rate equation and a dimensionless method, relational expressions between output power and system efficiency and the equivalent heat absorption temperature and the equivalent heat release temperature of a working medium cycle are led out; by use of a twp-step optimum seeking method, it is determined that the optimum system efficiency is half the sum of Carnot heat engine efficiency and CA efficiency in case of maximum power by use of an equal weight principle; by use of a minimum unit output power cost principle, a total heat-transfer coefficient ratio of a low-temperature heat exchanger to a high-temperature heat exchanger is preferentially selected, and it is determined that the output power in case of the optimum efficiency is equal to the maximum output efficiency in case that the total heat-transfer coefficient ratio is one; and the temperatures of the high heat source and the low heat source of an actual thermal system and the temperatures of heat absorption and dissipation processes of a working medium are equivalent thermal temperatures.