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Use of Natural Refrigerants in Supermarkets

5 Project finances

Tom Gøtsch, Super Køl A/S, wrote this chapter.

5.1 Statement of project finances

The statement of project finances is based on registration of hours/costs as shown below:

"Statement of project finances".

For competitive reasons, all figures have been converted proportionately as the final conclusion of the statement of project finances is based on a comparison with basic calculations made for a Fakta HFC parallel system.

Statement of project finances (index = construction costs = 100):

Statement of project finances (index = construction costs = 100)".
 

5.1.1 Total extra costs are mainly affected by the following three factors:

1. Electrical switch board
2. Installation (refrigeration system)
3. Design (refrigeration system)

Electrical switch board
The electrical switch board is affected particularly by:

• Frequency converter
• Special circuit breaker (AC/DC)
• Fuse circuit design
• 2 x compressor control, depending on frequency converter
• Oil control using PLC

If the solution is simplified, certain components are replaced (AC/DC relay and 1 x compressor control, in particular) and the oil control design is changed, the total project index is likely to drop from 56 to 40.

Installation (refrigeration system)

The process of installing the refrigeration system is affected by a lack of installation experience and a certain element of training the fitters involved in the project. Installation on the basis of some experience is likely to be made at index 75 rather than index 91.

Design (refrigeration system)

Increased system design experience and competition especially in regard to heat exchangers and compressors are likely to reduce the index from 100 to 90.  Assessing the Fakta Beder CO₂/propane project on the basis of the above adjustments will result in the following calculations:

Design (refrigeration system)".

5.2 Conclusion (project finances)

The CO₂/propane system and the chosen installation at Fakta Beder result in total extra costs ranging from 12 to 20% (from 27 to 18% for system and installation in isolated terms).

Looking at the extra costs of the CO₂/propane system on the basis of the Fakta Beder installation, one can make the following general statement:

The extra costs of the system will decrease considerably if its total kW needs increase. An estimate shows that the extra construction costs as far as refrigeration is concerned will be neutral if the capacity requirements increase by a factor of three (about 60 kW for refrigeration and about 30 kW for freezing).

The following conclusion can thus be made: the total extra costs of building a system that is three times larger than the Fakta Beder installation will range from 6 to 11%. This conclusion allows for the fact that the alternative HFC fill volume will also increase by a factor of three, implying that tax will have a substantially larger effect on calculations.

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