## 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

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.

## Post a comment