Blar i forfatter Artikler, rapporter og annet (automasjon og prosessteknologi) "Eiksund, Oddmar"

Viser treff 1-4 av 4

    • Comparing optimization schemes for solving case studies with multiple heat exchangers using high-order pinch point temperature difference methods 

      Brodal, Eivind; Jackson, Steven Richard; Eiksund, Oddmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-21)
      Heat exchangers (HEs) are often modeled using pinch point temperature difference (ΔT<sub>pinch</sub>) methods when optimizing systems with HEs. However, even small inaccuracies in model predictions of HEs will introduce numerical noise that can cause optimization algorithms to fail. A recent study of single HEs suggests that highorder interpolation methods can compute ΔT<sub>pinch</sub> much faster ...

    • Optimization study of heat pumps using refrigerant blends – Ejector versus expansion valve systems 

      Brodal, Eivind; Eiksund, Oddmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-19)
      This article investigates tap water heating systems to highlight an ongoing debate. Some report that CO2-based transcritical heat pumps with an ejector have the best coefficient of performance (COP), while others report that blend-based refrigerant systems (without an ejector) are better. In the literature, however, these systems are only compared with conventional heat pump designs, and not against ...

    • Performance and Design Study of Optimized LNG Mixed Fluid Cascade Processes 

      Brodal, Eivind; Jackson, Steven; Eiksund, Oddmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-26)
      Mixed Fluid Cascade (MFC) processes are often claimed to be one of the most efficient methods to liquefy natural gas. Their performance depends on both operating conditions such as ambient temperature, and system design parameters such as exchanger sizes. The performance of the standard MFC process can be further improved by modifying the design with additional equipment, such as liquid refrigerant ...

    • Transient Model of an RSW System with CO2 Refrigeration – A Study of Overall Performance 

      Brodal, Eivind; Jackson, Steven; Eiksund, Oddmar (Journal article; Peer reviewed; Tidsskriftartikkel, 2017-11-07)
      Refrigerated seawater (RSW) cooling using CO2 based refrigeration is a relatively new technology that shows promising performance in cold climates. For being a refrigerant CO2 has a low global warming potential (GWP) and is therefore recognized as an environmentally friendly alternative if the unit is competitive on energy efficiency. However, RSW systems with CO2 have a significant reduction in ...