Term
|
Definition
| life cycle cost = investment + maintainance and repair cost + (amortization cost) + operating cost (incl operating and labor) |
|
|
Term
| envelope interchange energy as: |
|
Definition
| connector, filter, barrier, switch. also emerging as a TRANSFORMER |
|
|
Term
distance X2 source power x2 mass x2 |
|
Definition
distance X2 = +6db source power x2 = +3db mass x2 = - 6db |
|
|
Term
|
Definition
| DF= daylight indoor illuminance/ outdoor overcast daylight illuminance X 100% |
|
|
Term
| (SSF) solar saving fraction |
|
Definition
| to evalute a building's splar heating erformance. Not %. more of a measure o the solar's conservation advantage. |
|
|
Term
|
Definition
| a # of HOT air has more volum than a# of COLD air. |
|
|
Term
|
Definition
| = lifecycle savings - lifecycle cost |
|
|
Term
| Internal Rate of Return (IRR) |
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| = annual saving/investment |
|
|
Term
| Absorption Coefficient (SABIN) |
|
Definition
| The % of incoming energy that is absorbed. In measuring radiant energy (light or heat) it’s a unitless ration that may vary depending on wavelength. In acoustics, it’s called a SABIN and may vary depending on frequency. |
|
|
