Cycles RA3

Cycles' objective is to improve cycles for converting heat-surplus to power, heat pumping cycles and energy storage. Vapour compression and expansion cycles, refrigeration and drying with energy recovery are main focuses alongside intelligent energy storage on a system level. Intelligent energy storage will enable large improvements within energy efficiency.

Cycles targets high capacity applications to maximise its impact on the energy consumption in Norwegian industry.

Potential innovations:

  • Competitive low and medium temperature power cycle concepts with cross-sectorial applicability
  • High-efficient HTHP cycle concepts for upgrading surplus heat to steam, displacing fossil fuel use
  • Integrated refrigeration units able to provide simultaneous heating/cooling/freezing/AC
  • Lightweight bottoming cycle & heat exchanger technology improving offshore/marine energy efficiency
  • New, enhanced technology concepts for large scale energy storage, crucial in future energy grids

Cycles consists of the following Work Packages (WP)

RA3 Cycles Trond Andresen SINTEF Energy Research
WP3.1 Energy-to-power conversion Trond Andresen SINTEF Energy Research
WP3.2 HTHP, cooling, and drying Michael Bantle SINTEF Energy Research
WP3.3 Energy storage Hanne Kauko SINTEF Energy Research

2018 Results

Energy-to-power conversion

A new methodology for design/off-design semi-steady state analysis of power production over variable heat source and -sink conditions was developed and demonstrated  in a potential study on utilizing available surplus low-pressure steam at Mo Industripark. In addition to optimizing power output, the new methodology evaluated optimal distribution of heat exchanger sizes in the system using a novel "generic heat exchanger model" (GHX). HighEFF partner Alfa Laval contributed  withperformance data from their commercial heat exchangers to allow for a validation of the model; and the resulting comparison of heat transfer areas for the same design specifications matched very well.

Development of thermo-electric generation systems for industrial surplus heat conversion resulted in a preliminary concept design of a redundant 480 W (24 V) TEG system including electrical architecture. Work in 2019 will target source/sink heat exchangers and fouling aspects, as well as evaluating impact potential for a selected industrial application.

High temperature heat pumps, cooling and drying

A heat pump for combined delivery of ice-water (0-4°C) and hot water (100-110 °C) was verified in a 20 kW demo unit in cooperation with HighEFFlab and HeatUp project. The compressor
prototypes were delivered by HighEFF partner Dorin Innovations (through RA2). A concept for a closed loop heat pump system, based on turbo-compressors, was evaluated with focus on more compact de-superheating in order to reduce the system size. This activity will be followed up by experimental investigations in the next years. Additionally, the so-called reversed Brayton Cycle was investigated; which has promising results for heat delivery of up to 500°C.

The advantages of R744 for process chilling was moutlined and compared with state of the art freezing/chilling systems. Such systems show high potential mfor increased productivity due to the mincrease heat removal.

Energy storage

2018 activities were focused on two tasks: 1 evaluation of thermal energy storage (TES) potential for industry clusters to reduce the use of peak heating; and 2 mapping processes within the industries represented in HighEFF that are suitable for, and that could benefit from, the application of high-temperature TES.

The first task was carried out as a case study towards Mo Industry park, and the work will be continued during 2019. The most promising cases from task (2) will be investigated further with in 2019. PhD candidate Håkon Selvnes continued his work on a novel cold thermal energy storage (CTES) related to a mfood processing factory. A pilot CTES unit was delivered  to the VATL laboratory at Gløshaugen by the local supplier Skala at the end of 2018, and the unit will be tested during 2019.

Trond Andresen

Senior Research Scientist
Name
Trond Andresen
Title
Senior Research Scientist
Phone
915 74 380
Department
Gas Technology
Office
Trondheim
Company
SINTEF Energi AS