The CO2 Transcritical Power Cycle for Low Grade Heat Recovery: Discussion on Temperature Profiles in System Heat Exchangers | Zendy

Yong Chen | Zendy; Per Lundqvist | Zendy

Open Access

The CO2 Transcritical Power Cycle for Low Grade Heat Recovery: Discussion on Temperature Profiles in System Heat Exchangers

Author(s) -

Yong Chen,

Per Lundqvist

Publication year - 2011

Publication title -

kth publication database diva (kth royal institute of technology)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.1115/power2011-55075

Subject(s) - transcritical cycle , heat exchanger , supercritical carbon dioxide , working fluid , thermodynamics , internal heating , rankine cycle , heat transfer , materials science , process engineering , nuclear engineering , supercritical fluid , mechanical engineering , power (physics) , heat pump , engineering , physics

Carbon dioxide transcritical power cycle has many advantages in low-grade heat source recovery compared to conventional systems with other working fluids. This is mainly due to the supercritical CO2 ’s temperature profile can match the heat source temperature profile better than other pure working fluids and its heat transfer performance is better than the fluid mixtures, which enables a better cycle efficiency. Moreover, the specific heat of supercritical CO2 will have sharp variations in the region close to its critical point, which will create a concave shape temperature profile in the heat exchanger that used for recovering heat from low-grade heat sources. This brings more advantage to carbon dioxide transcritical power systems in low-grade heat recovery. This study discusses the advantage of carbon dioxide power system in low-grade heat source recovery by taking this effect into account. A basic carbon dioxide transcritical power system with an Internal Heat Exchanger (IHX) is employed for the analysis and the system performance is also compared with a basic Organic Rankin Cycle (ORC). Software Engineering Equation Solver (EES) and Refprop 7.0 are used for the cycle efficiency and working fluid properties calculations.Copyright © 2011 by ASME

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