Date:

2025-04-30

Title of Paper:

Parametric study on the effects of a recuperator on the design and off-design performances for a CO2 transcritical power cycle for low temperature geothermal plants

Journal:

APPLIED THERMAL ENGINEERING

Summary:

A CO2 transcritical power cycle (CDTPC) is a promising power system to utilize low temperature geothermal heat
source. Many researchers mainly focus on the thermodynamic and thermo-economic performance analysis or
optimization for a CDTPC, or compare the design performance of a CDTPC with that of organic Rankine cycle.
The objective of this paper is to study the effects of a recuperator on the design and off-design performances of a
CDTPC for low temperature geothermal plants. Detailed off-design mathematical models of the basic and regenerative
CDTPCs are built to complete this study under the variable mass flow rates and temperatures of the
geothermal water and the cooling water temperatures conditions by a sliding pressure operation control
strategy. The results reveal that no matter how the geothermal water mass flow rate and temperature or the
cooling water temperature vary, both the overall net power and overall thermal efficiency of the regenerative
CDTPC system are higher than those of the basic CDTPC system. Meanwhile, a recuperator can improve the
overall system performance of a CDTPC system under the both design and off-design conditions, although the
recuperator might weaken the off-design behavior of some key components. In addition, a recuperator can
improve off-design behaviors of the CO2 pump performance under the off-design conditions. The guidelines for
the rotational speed listed in the tables for CO2 pumps might provide some reference for practical operation.

Co-author:

吴闯，王顺森，李军

Volume:

137

Page Number:

644-658

Translation or Not:

No

Date of Publication:

2018-06-05