Project - Isolated System Energy Charging (ISEC)

Lars  Olsen

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Project - Isolated System Energy Charging (ISEC)

Isolated System Energi Charging (ISEC)

Projectstart September 1st 2013. Ended March 31st 2016.

Purpose of project
The objective is to demonstrate an improvement in the energy efficiency of heat pumps with up to 50 % by using a novel technology where heat pumps are operated together with an optimal usage of storages which will reduce the average temperature level in the heat pump. The payback time for the investment is expected to be less than three years.

Project Objectives
The ISEC concept is based on known technologies used in a new and revolutionary yet simple way. Thus, the focus of the project is the adaption of components and management to achieve the best interaction between heat pump, heat storage and heat consumption. It will in fact be possible to construct certain essential components, for example the compressor, in a simpler way by means of the ISEC concept. By heating one tank at a time, the condensing temperature (or evaporating temperature) of the heat pump can be made to vary. This means that a condensing temperature which is only slightly higher than the medium temperature of the liquid during the heating process is obtained during the heating process. This is as such not possible during a traditional continuous heating of fluid, but the situation can be realized by using the ISEC concept. The ISEC concept consists of two (or more) tanks. One tank is heated (charged) while the other tank, which previously has been charged, is tapped for heat (discharged). When the second tank has been discharged, the first tank is fully charged with heat, and the system switches to discharge the first tank while the second tank is being charged. Seen from the heat source and the heat sinks perspective, the introduction of the ISEC concept does not change the conditions.


The project is divided into 9 phases:

  1. Project management. This phase entails coordinating tasks and distributing the work.
  2. Concept development and system calculations.
  3. Heat exchanger analysis and selecting type og heat exchanger.
  4. Storage tank analysis.
  5. Buildip and commissioning of lab scale pilot plant.
  6. Control system development.
  7. Testing scheme development.
  8. Construction of the demonstration plants and monitoring of the performance.
  9. Dissemination. The results of the project are evaluated, analysed and gathered in a paper. The results will be available via articles in magazines and will be presented at conventions.


  • Teknologisk institut
  • DTU Mekanik
  • SVEDAN Industri Køleanlæg A/S
  • Dansk Varmepumpe Industri A/S
  • Alfa Laval Copenhagen A/S
  • Arla Foods Amba
  • Bjerringbro Varmeværk Amba

This project was funded by the EUDP program Under the Danish Energy Agency.