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40 Graţiela Maria Ţârlea et al. Fig. 4 – TEWI factor versus evaporation temperature. Fig. 5 shows the annual energy consumption versus the evaporation temperature. It can be observed that the annual energy consumption for R717 refrigerant is 15% smaller than R404A and R507A. Fig. 5 – Annual energy consumption versus evaporation temperature. 4. Conclusions 1. The theoretical study analysed a single stage refrigeration system with R 404A as refrigerant. 2. To improve the eco-efficiency, the HFC refrigerant was replaced with an ecological refrigerant R717. 3. The comparative study of these facilities was based on the coefficient of performance of a refrigeration system and the TEWI factor.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 41 4. The refrigerant R717 is more eco-efficient than R404A and R507A with a 15% lower electrical power consumption, 6% higher coefficient of performance, 60% lower TEWI factor and 15% lower annual energy consumption. 5. Retrofitting the single stage refrigeration system by replacing R404A refrigerant with R717 it is proven that the savings are higher from the ecoefficiency point of view and the costs are lower (more equipment in the case of R717 than R404A). REFERENCES Ţărlea G.M., Vinceriuc M., Zabet I., Ţărlea A., Ecological Alternative for R404A Refrigerant. The 41st HVAC&R Congress KGH 2010, Tome “Heating, Refrigerating and Air-Conditioning”, 3-5 December, Belgrad, Serbia, 2010, pp. 27-33. Ţărlea G.M.,Vinceriuc M., Zabet I., Ţărlea A., Theoretically Study of Ecological Alternative for R404A, R507A and R22. The 42nd International Congress and Exhibition Heating, Refrigeration and Air-Conditioning November 30 – December 2, Belgrade, 2011. Ţărlea G.M., Vinceriuc M., Zabet I., Ammonia as a Very Eco-efficient Romanian Refrigerant. International Congress, 5-7 May COFRET, Iaşi, 2010. Zabet I., Contribution Regar<strong>din</strong>g the Study of the Eco-efficiency in Refrigeration Systems. PhD Thesis, 2011. STUDIU TEORETIC COMPARATIV PRIVIND ÎMBUNĂTĂŢIREA DIN PUNCT DE VEDERE AL ECO-EFICIENŢEI UNUI SISTEM FRIGORIFIC CA URMARE A ÎNLOCUIRII HIDROCARBURILOR ŞI AMESTECURILOR DE HFC CU AMONIAC (Rezumat) Criza energetică majoră precum şi încălzirea globală care afectează în prezent economia mondială şi viitorul societăţii umane, impun creşterea performanţelor energetice şi ecologice ale echipamentelor şi sistemelor frigorifice şi de aer condiţionat. În acest scop pe plan mondial există un efort susţinut pentru reducerea emisiilor de dioxid de carbon rezultate <strong>din</strong> arderea combustibililor fosili şi a altor emisii de gaze cu efect de seră. Se prezintă un sistem frigorific într-o treaptă de comprimare cu vapori funcţionând cu agentul frigorific R404A, instalaţie care a fost optimizata prin înlocuirea cu agentul frigorific R717. Structura aleasa la redactarea lucrării prezente este următoarea: în prima parte s-a făcut o scurta descriere a condiţiilor de lucru, în partea a doua s-au calculat parametrii teoretici de eco-eficienţă (TEWI, COP, puterea electrică consumată şi consumul anual de energie electrică) şi în a treia parte s-au prezentat rezultatele obţinute în urma studiului teoretic.
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