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76 Ion Zabet and Graţiela-Maria Ţârlea Fig. 10 (Zabet, 2011). This trend is due to two counteracting phenomenon: first the increase of the pressure inside the scrolls due to vapour injection and second the decrease of the enthalpy at injection point as the injection ratio increases. Φ0 [kW] 20,00 16,00 12,00 8,00 Without Injection With Injection 5,00 5,50 6,00 6,50 7,00 7,50 π [−] Fig. 2 – Cooling capacity versus pressure ratio. W cp [kW] 7,80 7,20 6,60 6,00 5,40 4,80 With Injection Without Injection 4,20 5,00 5,50 6,00 6,50 7,00 7,50 π [−] Fig. 3 – Compressor power versus pressure ratio. M cd [kg/s] 0,126 0,112 0,098 0,084 0,070 0,056 Without Injection With Injection 0,042 5,00 5,50 6,00 π [−] 6,50 7,00 7,50 Fig. 4 – Total mass flow rate versus pressure ratio. As can be seen from Fig. 9 the cooling capacity has a slight increase for injection ratio up to 9%. After this level, the cooling capacity decreases. In the same time with cooling capacity increases, the compressor power increases in a similar proportion which gives a quite constant coefficient of performance in the final.
t ex;cp [°C] Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 77 130 120 110 100 90 80 70 Without Injection With Injection 60 5,00 5,50 6,00 6,50 7,00 7,50 π [−] Fig. 5 – Compressor exhausted temperature versus pressure ratio. Φcd [kW] COP h [-] 30 25 20 15 10 With Injection Without Injection 5 5,00 5,50 6,00 6,50 7,00 7,50 π [−] Fig. 6 – Heating capacity versus pressure ratio. 4,00 3,50 3,00 2,50 2,00 Without Injection With Injection 1,50 5,00 5,50 6,00 6,50 7,00 7,50 π [−] Fig. 7 – Heating COP versus pressure ratio. The same phenomenon is happens for the compressor exhausted temperature. The discharge temperature increases very slightly up to 9%. After this point the discharge temperature starts to decrease, as it can be seen from Fig. 10.
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BULETINUL INSTITUTULUI POLITEHNIC D
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