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156 Marius Receanu et al. In Fig. 2 the functions of temperatures Tri and Tre tend to distinct values at approach to steady states. In situation b) - radiator obturated, the speed of increase of the temperatures at the approach to steady states (observed on Laptop) is greater as the situation a). The Eq. (4) can be written in the second transient phase for this situations a) and b) ( Ch Ch) cl( Θ Θ) Q q ' ' , l r − = − (6) where: Θ and Θ’ are the mean of functions ”product”: qr(t)[Tri(t)–Tre], respectively: q’r(t)[T’ri–T’re] in the second phases: [0, tr] or [0, t’r] t op = 1 q () t ⎡ ri() t re d r T −T ⎤ t top − ⎣ ⎦ tcltcl Θ ∫ , (7) t ' op ' 1 ' ' Θ = () () d ' ∫ q t ⎡ r T ri t −T ⎤ re t. (8) ⎣ ⎦ top −tcl t cl The function Θ and Θ’ – (7), (8), can be calculated with software in LabVIEW, after experiments and the relations ' Θ −Θ ' C h C h cl Q l − = ; ' Θ −Θ ' C h C h cl Q l ' h = − , and fuel economy, in percent : Ch −C ε = 100 , in MATLAB/Simulink. Ch For different position of the blind who obdurate the radiator: Fig. 3 (in positions: 0 –radiator is not obturated; 1, 2 ,3 – radiator is obturated) and some ambient temperatures
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 157 the graphs: Tri(t), Tre(t), qr(t) and T’ri(t), T’re(t), q’r(t) in the position “0” and “1” of blind. Table 1 Poz ck v cT tcl top ccl ctr Ch Ch’ ε Ch-Ch’ . l/100 km Km/h l s s l l l/h l/h % l/h 0 9.4 21.7 0.4 270 600 0.153 0.247 2.695 – – – 1 9.5 22.1 0.4 270 500 0.157 0.243 2.646 2.46 7.414 0.196 2 10.4 25 0.3 270 390 0.195 0.105 3.15 2.85 9.535 0.300 3 9.1 20.2 0.2 270 370 0.138 0.062 2.237 1.85 17.31 0.387 Tri(t) T’ri(t) t[min] Tre(t) T’re(t) t[min] qr(t) q’r(t) t[min] Fig. 4 – Graphs of Tri(t), Tre(t), qr(t) and T’ri(t), T’re(t), q’r(t) for the positions: “0” and “1” of blind. The experimental data demonstrate that the blind, who obturates the radiator, decreases time of the second transient phase and produces a fuel economy (Table 1). 3. Servomechanism for the Air Flow Control The car-engine cooling (1) system can be modified through the coolant flow (qr) or cooling air flow (ΔT=Tri–Tre). A method for the cooling air flow control is the utilization of blind, who obturates the radiator of car-engine for
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BULETINUL INSTITUTULUI POLITEHNIC D
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