86 Nomenclature

A

= annual payment

Alife

= levelized annual cost

am

= annual cost for maintenance (in first year $)

(A/P,r,N)

= capital recovery factor

C

= cost at size S

^cap

= capital cost (in first year $)

Clife

= life cycle cost

CPI

= consumer price index

Cr

= cost at a reference size Sr

^salv

= salvage value (in first year $)

fdep

= present value of total depreciation, as fraction of Ccap

fdep,n

= depreciation during year n, as fraction of Ccap

f

= fraction of investment paid by loan

4

= interest payment during nth year

L

= loan amount

m

= exponent of relation between cost and size of equipment

N

= system life (yr)

n

= year

N2

= doubling time

Ndep

= depreciation period (yr)

Np

= payback time (yr)

Nl

= loan period (yr)

Pe

= energy price

pe

= levelized energy price

(P/F,r,n)

= present worth factor

Pint = present value of interest payments

Pn = principal during nth payment period n r0 = (r " r inf)/(1 + rinf)

rd = market discount rate rd,e = (ri - re)/(1 + re)

re = market energy price escalation rate rinf = general inflation rate ri = market loan interest rate rM = market escalation rate for maintenance costs rr = internal rate of return

S = size of equipment s = annual savings t = thickness of insulation (m)

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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