İklimlendirme sistemlerinde R22 yerine R442A kullanılmasının enerji parametrelerine etkisinin incelenmesi

Atilla G. DEVECİOĞLU; Vedat ORUÇ; Uğur BERK; Sertaç ENDER

Makale detayları

İklimlendirme sistemlerinde R22 yerine R442A kullanılmasının enerji parametrelerine etkisinin incelenmesi

Yazarlar:

Atilla G. DEVECİOĞLU | Vedat ORUÇ | Uğur BERK | Sertaç ENDER

Yayıncı:

Dicle University

Dergi:

Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi 2016 Vol.7 Issue 3, pp.551-558

Belge Tipi:

Makale

Yayın Tarihi:

11/2016

Belge Dili:

Türkçe

Document ID (Org No.):

2000950750

Sıklık:

Üç Aylık

eISSN:

2146-4391

pISSN:

1309-8640

Anahtar kelimeler:

Özet:

 

The refrigerant of R22 is widely used in the airconditioning
 systems. However this refrigerant
 would be gradually removed to use as per Montreal
 protocol since it has a serious potential of ozone
 depletion. According to EU regulations,
 refrigerants, which do not deplete the ozone layer,
 having low global warming potential (GWP) should
 be preferred in both air-conditioning and
 refrigeration systems. Obviously, the gas leakages
 may occur from the available devices operating with
 R22 as a result of their maintenance and installation
 elsewhere. Hence, R22 currently utilized in the
 refrigeration systems should be replaced with
 refrigerants having ozone depletion potential (ODP)
 of zero in order to protect the ozone layer.
 Although the air-conditioners of small capacity are
 widely used, the effect of different alternative
 refrigerants (especially R442A) on the energy
 parameters such as COP, cooling capacity, and
 power consumption etc. is not well known. Some
 studies can be found in the literature on refrigerants,
 which are not ozone-depleting, as alternatives for
 R22 in the air-conditioning systems. The refrigerants
 such as R407C and R410A that do not deplete the
 ozone layer are used as an alternative for R22 in the
 air-conditioners by implementing some
 modifications in the system. It was remarked in the
 previous studies that the refrigerants should be
 preferred as alternatives to HCFC-22. The related
 investigations are still continuing due to the
 significance of the topic.
 The literature survey has pointed out that there are
 two possible methods to use the alternative
 refrigerants in air-conditioning or refrigeration
 systems. In the first one, the new refrigerant is
 directly charged into the system instead of R22
 without making any constructional modification
 which is called as “drop-in” process. On the other
 hand, the second method known as “retrofitting” in
 which changing compressor oil and/or modifying
 some elements of the system depending on the
 refrigerant type would be necessary.
 In this study, an experimental investigation was
 carried out using R442A as a substitute for R22 in a
 vapour compression air-conditioning system. A
 split-type air-conditioning device with a cooling
 capacity of 2.05 kW and operating with R22 was
 used as the experimental test unit. Although GWP
 values of R22 and R442A are similar, their ODP
 values are 0.05 and zero, respectively. Both
 refrigerants have been classified as non-flammable
 class by ASHRAE. Moreover, the thermodynamic
 properties of the tested refrigerants were seen to be
 in the similar range of magnitude.
 The compressor oil has only been changed in the
 experimental system such that while mineral oil was
 used for R22, synthetic Polyolester oil (POE) was
 utilized for the case of R442A. The experiments were
 conducted under the same conditions for each
 refrigerant at three different ambient temperatures,
 Ta (25°C, 30°C, 35°C). Basically, measurements of
 mass flow rate, pressure and temperatures in the
 system were accomplished for the experimental
 work. The enthalpy values of the refrigerants have
 been subsequently determined according to the
 measured data through Refprop software. The
 compression ratio, cooling capacity, power
 consumption of the compressor, and coefficient of
 performance (COP) were evaluated in the
 investigation. Then the comparison of these
 determined energy parameters for both refrigerants
 were performed. It was seen that mass flow rate of
 R442A was smaller than that of R22 at the
 considered ambient temperatures. The evaporation
 temperature, Te had greater values for higher Ta
 cases regardless of refrigerant type while Te for R22
 was lower compared to R442A. The compression
 ratio, PH/PL increased with Ta and it was larger for
 R442A case. The experimental results demonstrated
 that the cooling capacity and COP values of R22
 were somewhat greater in comparison with R442A.
 Furthermore, the power consumption of the
 compressor was lower in the case of using R22. In
 addition, the COP was considerably reduced as a
 result of increasing Ta for both refrigerants.
 According to the experimental results of the present
 investigation R442A should be a suitable refrigerant
 in the medium term that can be alternatively utilized
 in the air-conditioning systems considering its zero
 ozone depletion potential and similar energy
 parameters of R22.

 

Bu çalışmada buhar sıkıştırmalı iklimlendirme cihazında R22 soğutucu akışkanı yerine R442A kullanılması
 deneysel olarak incelenmiştir. Sistemde sadece kompresör yağı değiştirilmiştir. R22 ile çalışırken mineral
 yağ kullanılırken R442A ile yapılan çalışmalarda sentetik polyol ester (POE) yağ kullanılmıştır. Deneyler
 aynı çalışma şartları altında üç farklı çevre sıcaklığı (25°C, 30°C, 35°C) için tekrarlanmıştır. Deneyler
 sonucunda soğutucu akışkanlara ait kütlesel debi, soğutma kapasitesi, COP ve sıkıştırma oranı tespit
 edilmiştir. Tespit edilen bu enerji parametrelerinin mukayesesi yapılmıştır. Sonuçlarda R22’nin soğutma
 kapasitesi ve soğutma performans katsayısı R442A’ya göre bir miktar yüksek tespit edilmiştir. R22’nin
 elektrik tüketimi ise R442A’dan düşük tespit edilmiştir. Ozon yok etme potansiyeli sıfır olan ve R22’nin
 enerji parametrelerine yakın değerlere sahip R442A’nın orta vadede R22 yerine iklimlendirme sistemlerinde
 kullanılabilecek uygun bir soğutucu akışkan olduğu söylenebilir.

Makale detayları

İklimlendirme sistemlerinde R22 yerine R442A kullanılmasının enerji parametrelerine etkisinin incelenmesi

Yazarlar: Atilla G. DEVECİOĞLU | Vedat ORUÇ | Uğur BERK | Sertaç ENDER

Yayıncı: Dicle University

Dergi: Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi 2016 Vol.7 Issue 3, pp.551-558

Belge Tipi: Makale

Yayın Tarihi: 11/2016

Belge Dili: Türkçe

Document ID (Org No.): 2000950750

Sıklık: Üç Aylık

eISSN: 2146-4391

pISSN: 1309-8640

İklimlendirme sistemleri

R22

R442A

COP

Sayı

Yazarlar:

Atilla G. DEVECİOĞLU | Vedat ORUÇ | Uğur BERK | Sertaç ENDER

Yayıncı:

Dicle University

Dergi:

Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi 2016 Vol.7 Issue 3, pp.551-558

Belge Tipi:

Makale

Yayın Tarihi:

11/2016

Belge Dili:

Türkçe

Document ID (Org No.):

2000950750

Sıklık:

Üç Aylık

eISSN:

2146-4391

pISSN:

1309-8640