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Integration of solar energy in the company heat generation

Resources:
Energy, Materials, Carbon
Sector:
All sectors, Construction
Cost:
High cost
Annual saving:
15 - 30 %
Payback time:
1.5 - 5 Year(s)
Read more
Associated cost savings: Energy:
10 - 20%
Payback time:
payback time will depend the geographic location and solar resource
Total cost savings:
For conventional FPCs and ETCs costs range between 250-1000 EUR/kw in Europe. (IRENA) The energy cost for feasible solar thermal ranges between 2.5-8 EUR cents/kWh. (ESTIF, 2014) For concentrated systems, heating costs are in the range of 6-9 EUR cents /kWh. (ESTIF, 2014) Concentrated systems include Parabolic Dish Collectors (developed and used in India) with costs ranging from EUR 350–1  600/kW, Parabolic Trough Collectors with costs ranging from EUR 5500–18000/kW, and Linear Fresnel collectors in the range of EUR 1 100–1 700/ kW.
Premises and operation areas:
Office building, Production building
Size of company:
Micro (less than 10), Small (less than 50), Medium (less than 250), Large (more than 250)
Advancement in applying resource efficiency measures:
Intermediate, Advanced
One off investment:
5500 - 20000€
What is in it for you:
Solar energy heat generation, independent supply, cost savings, environmental benefits
Descriptive information:

Most industry-grade process heating systems are based on steam or hot water from boilers that today mainly burn fossil fuels like oil, gas and coal, or electricity generated by different sources.

Solar process heating systems can supply up to 20-30 % of the heating demands of an average plant. This is called the ‘solar fraction’. As a renewable energy source, low-temperature solar thermal technology has huge untapped potential. Solar thermal can be backed up by other heat sources and combined with storage systems for guaranteed supply.

Integration of solar thermal systems into industrial process heat can be done in the following ways:

  • Direct heating of a circulating fluid (e.g. feed-water, return of closed circuits, air preheating)
  • In processes with low-temperature requirements
  • As an additional source for preheating supply water for steam boilers
  • Direct integration of solar heating into fossil-fuelled industrial steam boilers

There are three groups of solar thermal technologies: solar air collectors (suitable for the food-processing industry to replace gas- and oil-based drying); solar water systems (installed on rooftops of any industrial building); and solar concentrators.

With advanced solar heating technologies, temperatures of around 400 degrees can be produced. Systems such as flat plate collectors (FPC) and evacuate tube collectors (ETC) can produce heat of up to 120 degrees. Ultra-high FPCs and ETCs can produce temperatures up to 200 degrees.

Most industrial processes require both the heating of a fluid stream (e.g. hot air streams, hot water, replenishment of water in baths) and heating of a reservoir (e.g. ovens, liquid baths).

Using solar energy for heating needs can go hand in hand with improvements in energy efficiency in buildings and heat-consuming processes, which generates additional cost-savings.

Solar thermal costs are largely predictable, with the biggest outlay expected during installation and set up, and typically pay for themselves quickly. Upfront investment is higher than conventional heating systems, but they are cheaper over the full life cycle.

The cost of energy generated through solar heat technologies is envisaged to continue declining over coming years (e.g. from 5-16 euro cents per KWh in 2006 to 2-6 euro cents in 2030 across the EU), according to ESTTP.

 

Sources

ESTTP (2006) Solar Heating and Cooling for a Sustainable Energy Future in Europe

IRENA (2015) Solar Heat for Industrial Processes, Technology Brief

Hafner B. et al. Development of an integrated solar-fossil powered steam generation system for industrial applications

The Potential of Solar Heat in Industrial Processes (POSHIP), 2001

Weiss, W. and Buchinger, J. (2003) Solar Drying: Establishment of a Production, Sales and Consulting

Weiss, W. and Rommel M. (2008), Process Heat Collectors

Energy Saver consumer resource of the US Dept of Energy, Estimating the Cost and Energy Efficiency of a Solar Water Heater

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