Standardisation of the interface between solar heat and industrial process heat
The aim of the joint project Modulus (Modular Power Transfer Station) is to develop a standardised, modular interface for the integration of solar heat into industrial process heat systems. Such an interface will make it considerably more costeffective and thus more attrac-tive to install a solar process heat system. The customary individual planning and individual production at the respective location has a high share in the total costs and also increases the risk of errors.
As part of the Modulus project, three test units are being developed and evaluated that represent different practicerelevant output sizes, temperature levels and customersupplied heat transfer media. The companies Industrial Solar, protarget and Solarlite are providing three different collector types for this purpose. The company Aura is contributing its expertise in the field of plant construction. Together with the four industrial project participants, researchers from the DLR Institute of Solar Research and Fraunhofer ISE will develop a largely standardised modular and scalable balance of plant (BoP) as an interface between the solar field and the industrial process heating system.
Figure 2 shows a schematic concept of such a BoP. Within the scope of the project, modules with thermal oil as the heat transfer medium in the primary circuit are to be realised. The secondary circuit will have one module each for hot air, saturated steam and thermal oil according to the requirements of the industrial process. The other components and subsystems of the BoP, in particular the control technology and safety equipment, are to remain as unchanged as possible in all variants.
The new concept for power transfer makes it possible to add further primary circuit modules for alternative heat transfer media (e.g. steam or hot water). In addition, it is planned to connect heat storage units that stabilise the operation and can also provide solar heat when no solar radiation is available.
As part of the research project, three power transfer stations will be tested and validated in a commercial project each in connection with a collector field.
Figure 3 shows the work packages of the Modulus project and the interfaces to the commercial projects.
Work package 2 draws on the experience of the collector manufacturers, among others, and uses the current framework conditions of the commercial project development and planning to develop a rough concept for the standardised BoP.
The detailed planning of the three test units in work package 3 uses detailed technical data and requirements from the projects. Their results flow into work package #4, which deals with the design and manufacture of the BoP.
The test and instrumentation plan, drawn up in work package 5, describes the test procedures and specifies the instrumentation requirements.
Work package 6 covers the installation and testing of the test units at the respective customers.
The extent to which standardisation has contributed to cost reduction is examined in work package 7.
Work package 8 is to prepare the commercial exploitation of the new BoP concept with the help of feasibility studies.
It is planned to publish the results in specialist publications and to present them in Task 64/IV "Solar Process Heat" of the SolarPACES network of the International Energy Agency IEA.