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Theoretical Study of Refrigerant Injection Technology Effect on Heat Pump Cycle Performance

Authors: Abdul Hadi N. Khalifa --- Johain J. Faraj --- Hayder K. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 14 Part (A) Engineering Pages: 2727-2738
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A 5 ton heat pump system with R22 was improved by Liquid Pressure Amplification (LPA) and refrigerant injection technologies. Three approaches for refrigerant injection were used. The first one was by mixture injection in suction line through accumulator; the second one was by liquid refrigerant injection through discharge line, while the third was a hybrid injection, in which vapour and liquid refrigerant were injected both simultaneously. For both approaches two and three LPA technique was used. The range of volume ratio of injected mixture and liquid was 1 to 7%, and 1 to 10% respectively, and in the hybrid injection, the volume ratio of injected mixture was 1 to 3% and for injected liquid was as mentioned above. The following improvement in cycle performance factors were achieved, for mixture injection 5.33%, for liquid injection 29.4%, and 33.45% for hybrid injection. The effect of condensing pressure on the cycle performance was studied also in this work.


Article
Energy and Exergy Analyses of Heat Pump Cycle with Refrigerant Injection Technology
تحليل الطاقة وجودتها لمضخة حرارية ذات تقنية حقن مائع التثليج

Authors: Abdul Hadi N. Khalifa عبدالهادي نعمة خليفة --- Johain J. Faraj جهين جودت فرج --- Hayder K. Hasan حيدر كريم حسن
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2016 Volume: 22 Issue: 11 Pages: 101-110
Publisher: Baghdad University جامعة بغداد

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Abstract

The effect of refrigerant injection techniques on the performance of heat pump system based on exergy analysis was studied theoretically. Three refrigerant injection techniques were used; the first was achieved by injected vapour in volume ratios from 1 to 7% in the accumulator. The second was injection liquid refrigerant in the discharge line with the aid of Liquid Pressure Amplification (LPA) pump, with volume ratios from 1 to 10%. The third was a hybrid injection with volume ratios of injected vapour and liquid varied from 1 to 3% and 1 to 10%; respectively. The following improvements in cycle performance were observed. For vapour injection technique, the best ratio of injection was 5%, the exergy destruction reduced by 21% and exergy efficiency enhanced by 14.6%. For liquid injection technique the best ratio of injection was 6%, the reduction in exergy destruction was 34% while the exergy efficiency increased by about 21.4%. The hybrid injection technique increased the exergy efficiency by 23% when the volume ratio of vapour and liquid injections are 3% each. The effect of condensing pressure on the cycle performance was studied also. The optimum exergy efficiency of the cycle was 54.55% achieved when the condensing pressure was 15 bars.

دراسة نظرية لبيان تأثير تقنيات حقن وسيط التبريد على أداء المضخة الحرارية وفقا لتحليل الاكسيرجي. تم أستخدام ثلاث تقنيات لحقن وسيط التبريد، الاولى أنجزت عن طريق حقن البخار بنسبة حجمية من 1 الى 7% داخل مجمع السائل. في الثانية تم حقن سائل وسيط التبريد خلال خط الدفع بأستخدام مضخة تضخيم ضغط السائل مع نسب حجمية من 1 الى 10%. التقنية الثالثة كانت الحقن المزدوج بنسب حجمية للبخار والسائل المحقونين من 1 الى 3% و 1 الى 10% على التعاقب. لوحظت التحسينات التالية في الدورة، لتقنية حقن البخار كانت افضل نسبة للحقن 5%، قلت الاكسيرجي الضائعةالى 21% وتحسن كفاءة الاكسيرجي الى 14.6%. لتقنية حقن السائل كانت افضل نسبة للحقن 6%، قلت الاكسيرجي الضائعة الى 34% بينما تحسنت كفاءة الاكسيرجي الى 21.4%. في تقنية الحقن المزدوج ازدادت كفاءة الاكسيرجي الى 23% عندما كانت النسبة الحجمية للبخار والسائل المحقونين 3% لكل منهما. تمت دراسة تأثير ضغط التكثيف على اداء الدورة ايضاً. أقصى كفاءة اكسيرجي للدورة 54.55% تم الحصول عليها عندما كان ضغط التكثيف 15 بار.

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