Organic Rankine cycle driven by geothermal heat source: life cycle techno-economic–environmental analysis

Liu, Chao; Wang, Shukun; Ren, Jingzheng

doi:10.1016/b978-0-12-820539-6.00003-0

Cited by 3 publications

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As it has been shown elsewhere, 69,70 the expansion device is usually the most expensive part of an ORC or TFC device; as a result, lowering the cost of the expander/turbine should be prioritized to reduce the entire investment cost of the system. Using the super dry working fluids, the temperature of the residual heat for ORC is higher than TFC; thus, a larger recuperative heat exchanger is required for ORC.…”

Section: Discussionmentioning

confidence: 99%

Investigation of thermal efficiency for subcritical ORC and TFC using super dry working fluids

Ahmed

Imre

2022

Energy Science & Engineering

View full text Add to dashboard Cite

Efficiency is a crucial factor for power cycles. Generally, in the same temperature range, the cycle efficiency for a basic organic Rankine cycle (ORC) is higher than a similar trilateral flash cycle (TFC) for almost all working fluids and heat source/heat sink temperature pairs. According to some recent results, by using super dry working fluids, the thermal efficiency of TFC can outperform its ORC counterpart at high temperatures. This study performed the thermodynamics analysis using three dry working fluids with subcritical basic ORC and TFC with zero to partial recuperated heat ratio. The results showed that using recuperative heat exchange effectively contributes to increasing the efficiency of ORC and TFC. However, the rate of efficiency increase in ORC is higher than the TFC, which can be clearly seen, especially at high maximal cycle temperatures. Using super dry working fluids, the recuperator‐free TFC has favorable cycle efficiency at high heat source temperatures. In contrast, by adding heat recovery for both systems, the ORC can outperform the TFC at 0.4, 0.2, and 0.1 recuperated heat effectiveness for Dodecane, Decane, and Nonane, respectively.

show abstract

Section: Discussionmentioning

confidence: 99%