MANSOURA ENGINEERING JOURNAL, (MEJ), VOL. 41, ISSUE 1, MARCH 2016 M: 31 RECEIVED: 3 FEBRUARY, 2015 - REVISED: 15 FEBRUARY 2016 – ACCEPTED: 12 MARCH, 2016 Mansoura University Faculty of Engineering Mansoura Engineering Journal Comparative Experimental Study of Low GWP Alternative for R134a in a Walk-in Cold Room ارىحتباسي حرو تأثير ايون رية لداء فرقارنة عمل دراسة م لفريون منخفض بذيلR134a لغرفة تبريذ A. Khalil * , A.E. Kabeel * , M.M. Bassuoni * and M.S.Raslan * * Tanta University, Faculty of Engineering, Mechanical Power Dept., Egypt. خص العشبيول ال: - اصبحث الي ،بحثي البحوبهب عبلويب لذ إ العبلو الحشاسبسحببجوة هي الح البيئية ال وشبكل ز لحث عي بذائل البس هشجفعة أصبح هي الضش حشاسبسحبخذهة حبليب رات قيوة احبت الوسح ذ أى الفشي ٍ ج ٌ  لوب عل .خفض ه حشاسبسحبى رات جأثيش احجك ظوفس ال  علبت جعول الفشيظبمشيذ جعول بء غشفة جبشب رلك جن ا ي الداء بي فعول هقبسرلك ل خبسط البضغب اR1234ze وR134a وذلك فى إمشكلة لولحلر البحث عن أحد ال طا ر تبين أن السعة التبريدية لفريونلختباة لغرف التبريد. وبعد ان تم ا المستخدملفريوناتس الحرارى للحتباع قيمة ارتفا ا R1234ze سبة تصل من أقل بن2 الى% 31 من% R134a ا هى إليهتوصل درجة تبخير يمكن ال . وأقل- 31 ْ م على عكس الفرويونR134a ليهاتوصل ا درج حرارة تبخير يمكن ال أقل– 13 ستخداملنظام بالطاقة ل استهلك ا ومعدل ْ م الفريونR1234ze ستخدام الفريون أقل منه باR134a بنسبة9 ا% لى31 ن الفريون الجديد يحبذى ذلك فا . وعل% استخدامه فىت حرارة درجا تبخيرم التبريد.ت على نظاتعديللية والمتوسطة بعد اجراء بعد اللعا ا Abstract: - The environmental problems induced by the ongoing increase in the global worming potential (GWP) pose a significant interest among researchers. It was found that, the currently used refrigerants are with high GWP [1], so that it becomes necessary to search for alternatives to these refrigerants that can properly operate on the same systems but with low GWP. Therefore a walk-in cold room working with vapor compression cycle is constructed to compare the performance of the high GWP refrigerant R134a to low GWP refrigerant R1234ze in a trail to provide a solution to the problem of high GWP of refrigerants currently used in cold rooms. The results obtained in this study have shown that, the cooling capacity of R1234ze was lower than that of R134a by 2% to 13%. The lowest evaporating temperature that could be reached for R1234ze is -13 o C while the lowest temperature of R134a is – 30 o C. Regarding the power consumption, R1234ze has lower power consumption than R134a by about 9% to 15% therefore it can be concluded that R 1234ze can be recommended to be used at high and medium evaporating temperature after carrying out the modification on the refrigeration cycle 1. INTRODUCTION he continuous growth in GWP all over the world constitutes a threatening environmental phenomenon that should be studied to find scientifically based solutions. Refrigerants used in the last few decades such as CFCs and HCFCs including R11, R12, R22 and R502 have depleted the ozone layer and consequently lead to the greenhouse effect on the climate. Therefore, the use of low GWP and zero ozone depletion potential (ODP) refrigerants becomes very essential to prevent further depletion of the ozone layer and consequently guard against the greenhouse effect on climate. In the year 1996 the production of R11 and R12 were completely banned, furthermore the production of HCFCs will be completely banned after 2030. Although the ODP of R134a and R404a are zero however, they have a high value of GWP. The production of R134a may thus be completely T