scholarly journals Energy, environmental and enviroeconomic analysis of the use R134a/R1234yf (10/90) as replace to R134a in a vapor compression cooling system

2020 ◽  
Vol 7 (4) ◽  
pp. 101-106
Author(s):  
Ragıp YILDIRIM ◽  
Abdullah YILDIZ
2020 ◽  
Vol 28 (04) ◽  
pp. 2050038
Author(s):  
Dishant Sharma ◽  
Gulshan Sachdeva ◽  
Dinesh Kumar Saini

This paper presents the analysis of a modified vapor compression cooling system which uses an ejector as an expansion device. Expanding refrigerant in an ejector enhances the refrigeration effect and reduces compressor work. Therefore, it yields a better coefficient of performance. Thermodynamic analysis of a constant area ejector model has been done to obtain primary dimensions of the ejector for given condenser and evaporator temperature and cooling capacity. The proposed model has been used to design the ejector for three refrigerants; R134a, R152a and R1234yf. The refrigerant flow rate and the diameters at various sections of the ejector have been obtained by doing numerical modeling in Engineering Equation Solver (EES). Refrigerant R1234yf demanded the highest diameter requirements at a fixed 5∘C evaporator temperature and 40∘C condenser temperature for a given range of cooling load. Both primary and secondary refrigerants flow rates are higher for R1234yf followed by R134a and then R152a.


Energy ◽  
1986 ◽  
Vol 11 (10) ◽  
pp. 1005-1021 ◽  
Author(s):  
William M. Worek ◽  
Moon Chung-Ju

2019 ◽  
Vol 23 (2 Part B) ◽  
pp. 1189-1201 ◽  
Author(s):  
Merve Acar ◽  
Oguzhan Erbas ◽  
Oguz Arslan

Author(s):  
Abdul Ahad Iqbal ◽  
Ali Al-Alili

Abstract The performance of air conditioning systems is highly dependent on the environmental conditions of the high pressure side, where heat is rejected to the environment. Air conditioning systems utilize dry cooling systems which often don’t provide adequate cooling during peak cooling periods, or wet cooling systems which consume a lot of water. In this study, a novel hybrid cooling system that can provide both wet and dry cooling was modelled in TRNSYS, and used to provide cooling to closed sorption air conditioning systems. The performance of these systems with the hybrid cooling system was compared to the performance of a standard vapor compression cooling system being cooled by a dry cooling system. The COPsol of the vapor compression cooling system exhibited a decrease of almost 26% during the summer period, whereas the COPsol of the sorption systems increased by around 30%. Similarly, the cooling capacity of the vapor compression cooling system dropped by almost 5%, and for the sorption systems, it increased by around 20% during the summer period.


2018 ◽  
Vol 11 (76) ◽  
pp. 3755-3763
Author(s):  
Guillermo Valencia Ochoa ◽  
Luis Obregon Quinones ◽  
Jorge Duarte Forero

2018 ◽  
Vol 3 (2) ◽  
pp. 73-82
Author(s):  
Audri Deacy Cappenberg ◽  
Haris Ramadan

AbstrakSistem pengkondisian udara yang mengatur temperatur dan  kelembaban udara dalam ruangan, dalam pengoperasiannya membutuhkan refrigeran yang mudah menyerap dan melepaskan kalor. Setiap refrigerant memiliki karakteristik yang berbeda-beda yang mempengaruhi efek refrigerasi dan koefesien prestasi yang dihasilkan. R 22 adalah salah satu refrigeran yang memiliki karakteristik yang baik pada mesin pendingin. Software Genetron properties adalah sebuah software simulasi yang dapat menghitung aliran fluida atau refrigerant pada mesin pendingin. Genetron properties melakukan simulasi termodinamika untuk siklus kompresi uap dan memberikan hasil dalam bentuk tabulasi dan pada diagram Mollier diagram (h-s diagram). Pengujian prestasi mesin pendingin yang menggunakan  R-22 dilakukan secara aktual dan simulasi dengan menggunakan software genetron properties. Hasil pengujian dan perhitungan menunjukkan bahwa : Kerja kompresor, COP dan performance factor  pada mesin pendingin kompresi uap ketika high speed  adalah 0,528 kW,  8,42 dan 0,1187;  saat low speed adalah 0,528 kW; 8,52 dan 0,117.  COP dari   hasil pengujian dengan software genetron properties ketika high speed 2,193 saat low speed 1,415 hal ini dikarenakan mesin pendingin kompresi uap dalam keadaan tidak optimalKata Kunci : Mesin Pendingin, Kompresi Uap, COP AbstractAir conditioning system that regulates temperature and humidity in the room, in operation requires refrigerants that are easy to absorb and release heat. Each refrigerant has different characteristics that affect the effects of refrigeration and the performance coefficients produced. R 22 is one of the refrigerants that has good characteristics on cooling system. Genetron properties is a simulation software that can calculate fluid flow or refrigerant on a cooling sistem. Genetron properties perform thermodynamic simulations for vapor compression cycles and provide results in tabulation and Mollier diagram diagrams (h-s diagrams). Testing the performance of cooling system using R-22 is done in actual and simulated using genetron properties software. The test results and calculations show tha the work of compressor, COP and performance factors on vapor compression cooling system when high speed is 0.528 kW, 8.42 and 0.1187; when low speed is 0.528 kW; 8.52 and 0.117. COP from the results of testing with genetron software properties when high speed 2,193 at low speed 1,415 this is because the vapor compression of cooling system is in an optimal condition Keyword: Cooling system, vapor compression, COP


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