Steam traps Manifolds and insulation jackets
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2018
TI-P117-11 CMGT Issue 4
Payback Calculator for IJ-MSC04, IJ-MSC08, IJ-MSC12, IJ-MSC04-H, IJ-MSC08-H and IJ-MSC12-H
This payback calculator provides a method for calculating the payback period based on the energy saving to be made by fitting an insulation jacket type IJ-MSC and IJ-MSC-H to a manifold type MSC. The method equates the cost of energy (to be agreed with the end user), the cost of the insulation jacket (which may include the cost of installation) and the annual heat loss from the manifold (the ambient temperature is to be agreed with the end user). The annual heat saving is determined from the graph. Select the ambient temperature value on the x-axis and run a vertical line up to the operating temperature. Then run a horizontal line to the y-axis where the value of annual heat saving can be read. For example, at an ambient temperature of 21 °C and an operating temperature of 180 °C the annual heat saving will be 6 GJ/year.
J
J
J
The payback period can be calculated using the following equations:
for MSC04
for MSC08 P =
for MSC12 P =
P =
1 SE
2 SE
3 SE
Where:- S = Annual heat saving from graph
Conversion factors 1 GJ = 1000 MJ 1 GJ = 9.48 x 105 BTU Example 1 Consider a MSC08 operating at 9 bar g, 180 °C with an ambient temperature of 21 °C. From the graph below the annual heat saving, S, is 6 GJ/year. The cost of insulation jacket, J, including installation is assumed to be £150 Customer informs us that cost of energy, E, is £5/GJ
GJ
J = Cost of insulation jacket
£
5.10.12
E = Cost of energy
£/GJ
P = Payback period
year
The equations are valid providing E and S are in the same units of energy and E and J are in the same units of currency.
J
150
Hence:-
P =
=
= 2.5 years
2 SE
2 x 6 x 5
8.10 19
Note: The table overleaf gives exact values used to plot this graph. Intermediate temperatures may be obtained by linear interpolation.
Ambient temperature °C
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