|
| |
   
Case Study in a Cold Storage
Environment of SZL340 lighting systems versus 400W metal halide light fittings
|
Costing |
|
% of Lights |
# of Lights |
|
|
Number of Lights |
|
58% |
87 |
|
|
Cost Per Light Unit including installation ex VAT |
£760 |
|
|
|
|
Total Contract Cost ex VAT |
|
|
|
£66,120 |
|
|
|
|
|
|
|
Existing lighting |
No of lamps on |
Wattage |
|
|
|
Number of 250W metal halide lights |
0 |
290 |
|
|
|
Number of lamps on at 400W |
150 |
480 |
|
|
|
Total electrical consumption, kWh |
|
72.0 |
|
|
|
SZL Lighting |
|
|
|
|
|
Percentage of Lamps actually on |
60% |
|
|
|
|
Number of lamps on |
52 |
342 |
|
|
|
Total electrical consumption, kWh |
|
17.9 |
|
|
|
Hours per day |
|
24 |
|
|
|
Days per week |
|
7 |
|
|
|
Days per year |
|
365 |
|
|
|
Total hours lamps on / Yr |
|
8,760 |
|
|
|
Lighting Consumption |
|
Prior |
New |
Saving |
|
Existing, kWh / Yr |
|
630,720 |
156,387 |
474,333 |
|
Price per kWh |
£0.06 |
|
|
|
|
Cost Per Year |
|
£37,843 |
£9,383 |
£28,460 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Refrigeration Savings |
|
Prior |
New |
Saving |
|
Metal Halide Heat output as % of Total Power Consumed |
71% |
|
|
|
|
Heat generated by lamps inside cold space, kWh/Yr |
|
447,811 |
2,221 |
|
|
Residual Heat - IR from SZL System |
2% |
|
|
|
|
Coefficient of Performance of Refrigeration Equipment |
1.3 |
|
|
|
|
Energy to remove heat from existing lamps, kWh/Yr |
|
344,470 |
1,708 |
342,762 |
|
Cost Per Year |
|
£20,668 |
£102 |
£20,566 |
|
|
|
|
|
|
|
Total Power Comsumption |
|
Prior |
New |
Saving |
|
Total Consumption in kWh/Yr |
|
975,190 |
158,095 |
817,095 |
|
|
|
|
|
|
|
saving in GBP |
|
|
|
£49,026 |
|
|
|
|
|
|
|
Maintenance Savings |
|
Prior |
New |
Saving |
|
Lamp Life, Hours |
|
10,000 |
20,000 |
|
|
Lamp Life, Years |
|
1.1 |
3.8 |
|
|
Number of Lamp Changes / year |
|
131 |
14 |
118 |
|
Hire of Scissor lift |
£400 |
£0 |
|
|
|
Frequency of Scissor Lift Hire |
0 |
|
|
|
|
Cost Per Lamp |
|
£14.50 |
£34.00 |
|
|
Man Hours Per Lamp Change |
|
0.35 |
0.17 |
|
|
Cost Per Man Hour |
£30.00 |
|
|
|
|
Cost Per Lamp Change |
|
£25 |
£39 |
|
|
Total Maintenance Savings / yr |
|
£3,285 |
£535 |
£2,750 |
| |
|
|
|
|
|
Climate Change Levy |
|
|
|
|
|
Annual Climate Change Levy / kWh |
£0.00485 |
£4,730 |
£767 |
£3,963 |
|
|
|
|
|
|
|
Enhanced Capital Allowance Scheme |
|
|
|
|
|
Corporation Tax Rate |
|
|
|
28% |
|
Capital Allowance |
|
|
|
100% |
|
ECA cash flow advantage |
|
|
|
£18,514 |
|
Cash Flow Calculations |
Year1 |
Year2 |
Year3 |
Year4 |
Year5 |
|
Annual Electricity Savings |
49,026 |
49,026 |
49,026 |
49,026 |
49,026 |
|
Loan Payments |
0 |
0 |
0 |
0 |
0 |
|
Climate Change Levy Saving |
3,963 |
3,963 |
3,963 |
3,963 |
3,963 |
|
Capital Allowance |
18,514 |
0 |
0 |
0 |
0 |
|
Savings on Maintenance |
2,750 |
2,750 |
2,750 |
2,750 |
2,750 |
|
Net Positive Cash Flow to Business |
£74,252 |
£55,739 |
£55,739 |
£55,739 |
£55,739 |
|
|
|
|
|
|
|
|
Estimated Payback Period (years) excluding financing payments |
|
|
|
0.9 |
|
|
|
|
|
|
|
|
Estimated savings over five years |
|
|
£297,207 |
| *
Subzero Lighting Limited
Registered
Office: 49 Sandy Lodge way, Northwood, Middlesex HA6 2AR, UK
Registered in England Company
Number 07017416 VAT Registered 979470754
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