Analysis of Air-to-Water Heat Pump in Terms of Energy Efficiency under Different Ambient Conditions

İsmail Altun; Ayhan Onat

Makale detayları

Analysis of Air-to-Water Heat Pump in Terms of Energy Efficiency under Different Ambient Conditions

Yazarlar:

İsmail Altun | Ayhan Onat

Yayıncı:

Marmara University

Ana Başlıklar:

Akışkan Akışı | Isı ve Kütle Transferinde Deneysel Yöntemler

Dergi:

International Journal of Advances in Engineering and Pure Sciences Vol.37 Issue 3, pp.369-377

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001358162

pISSN:

2636-8277

Anahtar kelimeler:

Özet:

 Air-to-water heat pumps are devices that work based on the vapor compression cooling cycle and are used to meet the heating, cooling and domestic hot water needs of users. In order for these devices to be used effectively in terms of energy efficiency, it is necessary to evaluate the environmental conditions in which they will operate. The heat source of air-to-water heat pumps is air. Within the scope of this study; with the help of experiments, the temperature and relative humidity values, which are two important characteristics of the air, were changed at certain intervals and the performance coefficient COP and energy efficiency ratio EER of the air-to-water heat pump were calculated for each temperature-relative humidity point. The variation of water outlet temperatures with ambient temperature and relative humidity has been shown. As a result of the experiments, it was seen that the COP values varied between 2.13 at -15 C ambient temperature and 5.24 at 20 C ambient temperature, depending on the ambient temperature. The data obtained from the experiments were analyzed using IBM SPSS Statistics program. As a result of the analysis, a mathematical model equation was found that relates the COP value to the compressor inlet-outlet temperature, condenser outlet temperature and evaporator inlet temperature. The COP values calculated in the experiments were evaluated by comparing the COP values found when using the mathematical model equation obtained from the program. In addition, an original contribution to the literature has been made in terms of experimentally addressing the effect of relative humidity.

 Air-to-water heat pumps are devices that work based on the vapor compression cooling cycle and are used to meet the heating, cooling and domestic hot water needs of users. In order for these devices to be used effectively in terms of energy efficiency, it is necessary to evaluate the environmental conditions in which they will operate. The heat source of air-to-water heat pumps is air. Within the scope of this study; with the help of experiments, the temperature and relative humidity values, which are two important characteristics of the air, were changed at certain intervals and the performance coefficient COP and energy efficiency ratio EER of the air-to-water heat pump were calculated for each temperature-relative humidity point. The variation of water outlet temperatures with ambient temperature and relative humidity has been shown. As a result of the experiments, it was seen that the COP values varied between 2.13 at -15 C ambient temperature and 5.24 at 20 C ambient temperature, depending on the ambient temperature. The data obtained from the experiments were analyzed using IBM SPSS Statistics program. As a result of the analysis, a mathematical model equation was found that relates the COP value to the compressor inlet-outlet temperature, condenser outlet temperature and evaporator inlet temperature. The COP values calculated in the experiments were evaluated by comparing the COP values found when using the mathematical model equation obtained from the program. In addition, an original contribution to the literature has been made in terms of experimentally addressing the effect of relative humidity.

 Air-to-water heat pumps are devices that work based on the vapor compression cooling cycle and are used to meet the heating, cooling and domestic hot water needs of users. In order for these devices to be used effectively in terms of energy efficiency, it is necessary to evaluate the environmental conditions in which they will operate. The heat source of air-to-water heat pumps is air. Within the scope of this study; with the help of experiments, the temperature and relative humidity values, which are two important characteristics of the air, were changed at certain intervals and the performance coefficient COP and energy efficiency ratio EER of the air-to-water heat pump were calculated for each temperature-relative humidity point. The variation of water outlet temperatures with ambient temperature and relative humidity has been shown. As a result of the experiments, it was seen that the COP values varied between 2.13 at -15 C ambient temperature and 5.24 at 20 C ambient temperature, depending on the ambient temperature. The data obtained from the experiments were analyzed using IBM SPSS Statistics program. As a result of the analysis, a mathematical model equation was found that relates the COP value to the compressor inlet-outlet temperature, condenser outlet temperature and evaporator inlet temperature. The COP values calculated in the experiments were evaluated by comparing the COP values found when using the mathematical model equation obtained from the program. In addition, an original contribution to the literature has been made in terms of experimentally addressing the effect of relative humidity.

 Havadan suya ısı pompaları kullanıcıların ısıtma, soğutma ve kullanım sıcak suyu ihtiyacının karşılanmasında kullanılan, buhar sıkıştırmalı soğutma çevrimi esasına dayalı çalışan cihazlardır. Bu cihazların enerji verimliliği açısından etkin bir şekilde kullanılabilmesi için çalışacağı ortam şartlarının değerlendirilmesi gerekmektedir. Havadan suya ısı pompalarının ısı kaynağı havadır. Bu çalışma kapsamında; yapılan deneyler yardımıyla havanın iki önemli özelliği olan sıcaklık ve bağıl nem değerleri belli aralıklarla değiştirilerek her bir sıcaklık-bağıl nem noktası için havadan suya ısı pompasının performans katsayısı COP ve enerji verimlilik oranı EER hesaplanmıştır. Su çıkış sıcaklıklarının ortam sıcaklığı ve bağıl nem ile değişimi gösterilmiştir. Deneyler sonucunda COP değerlerinin ortam sıcaklığına bağlı olarak -15 C ortam sıcaklığında 2,13 ile 20 C ortam sıcaklığında 5,24 arasında değiştiği görülmüştür. Deneylerden elde edilen veriler IBM SPSS Statistics programı kullanılarak analiz edilmiştir. Yapılan analiz sonucunda COP değerini kompresör giriş-çıkış sıcaklığı, kondenser çıkış sıcaklığı ve evaporatör giriş sıcaklığı ile ilişkilendiren matematiksel model denklemi bulunmuştur. Deneylerde hesaplanan COP değerleri ile programdan elde edilen matematiksel model denklemi kullanıldığında bulunan COP değerleri karşılaştırılarak değerlendirilmiştir. Ayrıca bağıl nem etkisinin deneysel olarak ele alınması açısından literatüre özgün bir katkı sağlanmıştır.

Makale detayları

Analysis of Air-to-Water Heat Pump in Terms of Energy Efficiency under Different Ambient Conditions

Yazarlar:

İsmail Altun | Ayhan Onat

Yayıncı:

Marmara University

Ana Başlıklar:

Akışkan Akışı | Isı ve Kütle Transferinde Deneysel Yöntemler

Dergi:

International Journal of Advances in Engineering and Pure Sciences Vol.37 Issue 3, pp.369-377

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001358162

pISSN:

2636-8277

Heat Pumps

Energy Efficiency

Cooling Cycle

Temperature

Relative HumidityIsı Pompası

Enerji Verimliliği

Soğutma Çevrimi

Sıcaklık

Bağıl Nem

Sayı

Makale detayları

Yazarlar: İsmail Altun | Ayhan Onat

Yayıncı: Marmara University

Ana Başlıklar: Akışkan Akışı | Isı ve Kütle Transferinde Deneysel Yöntemler

Dergi: International Journal of Advances in Engineering and Pure Sciences Vol.37 Issue 3, pp.369-377

Belge Tipi: Makale

Yayın Tarihi: 9/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001358162

pISSN: 2636-8277

Sayı

Yazarlar:

İsmail Altun | Ayhan Onat

Yayıncı:

Marmara University

Ana Başlıklar:

Akışkan Akışı | Isı ve Kütle Transferinde Deneysel Yöntemler

Dergi:

International Journal of Advances in Engineering and Pure Sciences Vol.37 Issue 3, pp.369-377

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001358162

pISSN:

2636-8277