By W. Austyn Mair
This ebook describes the foundations and equations required for comparing the functionality of an plane. After introductory chapters at the surroundings, simple flight idea, and drag, the e-book is going directly to examine intimately the estimation of hiking functionality, the correct features of strength vegetation, takeoff and touchdown functionality, diversity, and turning functionality.
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Engr. Vol. 79, I960, p. kQ2. 59 ENERGY CONVERSION FOR SPACE POWER P Tc n Tc Th Generator x r+ _L T I* ^ I L » ^ n Th ' Tc P Th Cooling Device Fig. 1 Schematic drawing of a Seebeck-effect thermo electric generator and a Peltier-effect thermo electric cooling device. The elements marked T and T, are heat reservoirs at temperatures T and T, (T < Τ,). They are assumed to have zero electrical resistance. The elements marked p and n are the active thermoelectric materials and are called the ''arms11 of the device.
This technique is open to question at high temperatures unless boundary conditions are arranged to limit stray thermal currents. Measurements of thermal conductivity at small-area-contacts have been continued and the parameters α, σ , and κ derived from these techniques have been checked for consistency with the values derived by more conventional techniques. In the measurement of thermal and electrical conductivites of semiconductors great care must be made to avoid cracks which will warp the potential and thermal distribution.
21 ENERGY CONVERSION FOR SPACE POWER 1 ^ T ' / / / / / A/ / / / / / T I Ξ l \ J V / / / / B / JJddSS,, S Τι <τ2 MATERIAL A: P-TYPE MATERIAL B: /V-TYPE J2 CROSS-SECTIONAL AREA OF EACH ELEMENT Ξ S Ξ L / / / / / . 2 LENGTH OF EACH ELEMENT ΔΤ = T 2 - Τχ P = l7r FOR Ρ P MAX B A (T Μ Α χ = : 7r:B A 4/cp S/c Y" MAX ~ S )-2/c 7 1 2 AT--Ip 2L — (25) ^ S 2Δ T Τχ /cp * T 1 rafe Ä T BA M 4/cp 2 Δ Τ 1 " 2 Δ T Ti , α β Α Ξ α,Α - ociß = 2α J (26) (27) J ABSOLUTE FIGURE OF MERIT: F i g u r e 5. (24) I « 7 Tl R A S / 2 p L BA^ S/cTi P 1 Z = a2//cp (28) R e l a t i o n s h i p s in t h e r m o e l e c t r i c c o u p l e s l e a d i n g to d e f i n i t i o n of f i g u r e of m e r i t .