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№ 2 (95)
А1
UNIVERSUM:
ТЕХНИЧЕСКИЕ НАУКИ
февраль, 2022 г.
EXERGETIC ANALYSIS OF AIR CONDITIONING AT DIFFERENT OUTDOOR TEMPERATURES
Abdullakhuja Norkhujaev
Assistant of the Department of Refrigeration and Cryogenic technique.
Tashkent State Technical University Uzbekistan, Tashkent E-mail: a.norxojayev@mail.ru
Boburjon Iskhokov
Master of the Department of Refrigeration and Cryogenic technique,
Tashkent State Technical University Uzbekistan, Tashkent E-mail: linknbo b @gmail. com
ЭКСЕРГЕТИЧЕСКИЙ АНАЛИЗ КОНДИЦИОНИРОВАНИЯ ВОЗДУХА ПРИ РАЗЛИЧНЫХ НАРУЖНЫХ ТЕМПЕРАТУРАХ
Норхужаев Абдуллахужа Саидолимхужаевич
ассистент кафедры холодильной и криогенной техники, Ташкентский государственный технический университет, Республика Узбекистан, г. Ташкент
Исхоков Бобуржон Гулом Угли
магистр кафедры холодильной и криогенной техники, Ташкентский государственный технический университет, Республика Узбекистан, г. Ташкент
ABSTRACT
The article examines the cooling agents that cause the depletion of the ozone layer and the alternatives to these cooling agents. Exergetic analysis was also performed. The study compared the refrigerants R22, R410A, 290 and R32 used in a split air conditioner with a capacity of 12000 Btu / s.
АННОТАЦИЯ
В статье рассматриваются хладагенты, вызывающие разрушение озонового слоя, и альтернативы этим хладагентам. Также был проведен эксергетический анализ. В исследовании сравнивались хладагенты R22, R410A, 290 и R32, используемые в сплит-кондиционере мощностью 12000 БТЕ/с.
Keywords: R22, R410A, 290, R32, exergetic analysis, refrigerant, alternative, Ozone, cooling efficiency, cooling coefficient.
Ключевые слова: R22, R410A, 290, R32, эксергетический анализ, хладагент, альтернатива, озон, эффективность охлаждения, коэффициент охлаждения.
Introduction
The production of artificial cooling, obtaining temperatures below ambient temperatures, is widely used in many areas of the economy in the implementation of various technological processes. Refrigeration technology is needed in many areas of human activity.
Life on Earth has been preserved for thousands of years because of its protective atmosphere. This layer is called ozone and protects the Earth from the sun's harmful ultraviolet rays. If the protective layer is broken, the harmful part of the sun's ultraviolet rays will affect the Earth's surface, killing most living organisms possible. One of the industries that has a negative impact on ozone is
artificial cooling. It is impossible to imagine our lives and activities today without artificial cold [1, p. 76].
Research methodology and results
R32 refrigerant is an alternative to R410A, which is currently used instead of R22 refrigerant. The reason can be seen in Table 3.1. The global heating potential (GWP) of R32 is much lower than that of R410A. So R32 is environmentally friendly.
Table 1 shows the characteristics of R32, R410A, R22 and R290. The physical properties of R410A and R32 are very close, so copper pipes of the same diameter are used in the operating mode of the split system. It should be noted that the same oil is used.
Библиографическое описание: Norkhujaev A.S., Iskhokov B.G. EXERGETIC ANALYSIS OF AIR CONDITIONING AT DIFFERENT OUTDOOR TEMPERATURES // Universum: технические науки : электрон. научн. журн. 2022. 2(95). URL: https://7universum. com/ru/tech/archive/item/13013
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Table 1
Comparison of some properties of refrigerants under study R32 R410A R22
R290
Category
Composition (Mixture Ratio wt%) Boiling temperature (°C) ODP GWP
GFU
-51,7 0
675
GFU GXFU R32/R125 (50/50) -
-51,5 -40,8
0 0,055
2100 1810
propan
-42 0 3
The following is a study of a ozone-safe refrigerant R410A, R290 and R32 for a split air conditioner with a cooling capacity of 12000 Btu / s.
Today's world is living and adapting to global warming. The fact that the average temperature of our winters increases every year, and the extreme heat of our summers requires additional experiments. Therefore, we
graphically present the results of the study obtained when the ambient temperature is 30, 40, 50. In cooling mode, the air conditioning temperature is always higher than the outside temperature. That is, if the outside temperature is 30, the condensing temperature will be around 10 [2, p. 286].
■R22
R290
R410A
R32
6500
6000 ^ 5500
H 5000
О
4500
<
£ 4000
z
3 3500 О
g 3000 2500
2000
28
6200
5055
3281
2575
31
34 37 40 43 46
OUTDOOR TEMPERATURE. °C
49
52
Figure 1. Graph of correlation of cooling capacity of cooling agents R22, R410A, R290 and R32
to outdoor temperature
R290 is 1.27 times lower than R22. As can be seen, as the outside temperature increased, that is, in summer conditions, the results of all four cooling agents decreased. This is because as the outside temperature increases, the specific mass cooling efficiency (qo) of the refrigerant decreases, which in turn affects the self-cooling efficiency (Qo). Under these conditions, the R32 refrigerant
performed better than other refrigerants, but it dropped by 38% compared to the initial result. This figure was 38% in R410A and showed the same negative result as R32. However, these figures were 16% in R22 and 21% in R290, a positive result for them. [3, p. 23]
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О С
2н
'о
<u
X pü
15 14,5 14 13,5 13 12,5 12 11,5 11 10,5 10 9,5 9 8,5 8 7,5 7 6,5 6 5,5 5 4,5 4 3,5 3 2,5 2 1,5 1
0,5 0
-14,03
13,92940232
12,53097268 10,64338604
25
27
29
31 33 35 37 39 41 43 45 OUTDOOR TEMPERATURE, °C
0,32941176 47 49
0,517301038 ',508650519 0,304152249 51 53
•R32
R290
R22
R410
Figure 2. Relativity of outdoor temperature to exergy efficiency nex(%)
Figure 2 shows a graph of the change in the exergy efficiency of the refrigerant under study with a change in ambient temperature. In this graph, we can see that the exergy efficiencies of refrigerants decrease with a change (increase) in the ambient temperature. Refrigerants R290 and R22 have an exergy efficiency of 1.18 times
at an outdoor temperature of 30°C. The refrigerants R410 and R32 do not differ significantly at an outdoor temperature of 30°C. The exergy efficiency reaches a high result at an ambient temperature of 50°C and all refrigerants differ slightly [4, p. 176].
16
1.4
1,2
in m
О —]
s
W
Й 0,4
0,8
0,6
R32 R290 R22 R410
0,2 0
25 27 29 3 1 33 35 37 39 4 1 43 45 47 OUTDOOR TEMPER A TUR E °C
49 51 53
Figure 3. Relativity of outdoor temperature to exergy loss
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UNIVERSUM:
ТЕХНИЧЕСКИЕ НАУКИ
As the ambient temperature rises, the amount of ex-ergy loss increases, and such losses give different results in the cold agents we study (Figure 3). For R410 and R410 refrigerants, the exergy loss is much less than for R32 refrigerant. the same temperature at an ambient temperature of 30 ° C. However, with an increase in the outdoor temperature by 44 ° C, the exergy loss of R410 refrigerant increases more than that of R32 refrigerant [5, p. 179].
февраль, 2022 г.
Conclusion
The results of the study of refrigerants R22, R410A, R290 and R32 at different outdoor temperatures are as follows:
• The refrigerant R32 is 1.2 times higher than R410A, 1.5 times higher than R22, and 1.98 times higher than R290;
• The exergy efficiency of R410 and R32 is almost indistinguishable at an ambient temperature of 32-35°C, but when the ambient temperature exceeds 37° to 49°, the exergy efficiency of R22 refrigerant is the highest.
Reference:
1. Azizov D.H., Norkhujaev A.S., Research of split air conditioner in environmentally friendly cooling agent // Scientific and technical journal of Chemistry and Chemical Technology. №2, 2017 - pages 75-78.
2. Azizov D.H., Norkhojayev A.S., Research of a split air conditioner on environmentally friendly refrigerants // Collection of scientific papers international scientific and technical on-line conference. - Tashkent. TashSTU, 2020. pp. 285-288.
3. Azizov D.H., Norkhujaev A.S., Perspektivy perevoda split-konditsionerov na GFU - 410A // Molodoy uchonyy. International scientific journal. № 1 (135), January 2017. C. 20 -24.
4. Koraboev A.S., Norkhujaev A.S., Maxmudov O.O., Study of compressors with split conditioners with low pressure // Texnika i teknologii mashinostroeniya. Materials of the VII International scientific-technical conference. Omsk, May 21-23, 2018 S. 174-177.
5. Nurmatov T.B., Norkhujaev A.S., Khasanov B.B., Testing of split-conditioners with low pressure with the use of refrigerants R22 and R410A // Texnika i teknologii mashinostroeniya. Materials of the VII International scientific-technical conference. Omsk, May 21-23, 2018 C. 178-180.
