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Pay Back Time vs. refrigerator price
2.3. Micro Combined Heat and Power (µCHP)
12000
Pay Back Time for absorption refrigerator
ABS refrigerator Purchase
Price [DKK]
10000
8000
6000
4000
2000
0
0 5 10 15 20 25
Pay Back Time [years]
Figure 2.3: The x-axis shows the pay back time for a given purchase price of the absorption
refrigerator (i.e. how long time does it take before the ABS refrigerator becomes cheaper than a
regular electrical refrigerator.
The price of the normal refrigerator used for comparing is 4,000DKK,
so if the absorption refrigerator could be made for the same price 7 , the
pay back time would be zero years. If the lifetime of both types of
refrigerators is 10 years, the price of the absorption unit should be no
more than 7,000DKK if the investment is to become favorable within the
expected 10 year lifespan. Already with a price of 10,000DKK, the pay
back time exceeds 25 years.
Sensitivity analysis
It appears that the most important factor influencing the profitability of
the ABS refrigerator is the purchase price of the unit itself. If this is
increased by 10%, the deficit of the absorption solution is increased by
30%.
The electricity price, annual electricity consumption and the purchase
price of the electrical refrigerators, are all approximately equally
7 with no significant costs to installation and piping from the SOFC exhaust gas
27