The Cascade heat pump system is commonly used to overcome the high temperature lift problem of the system. In the present investigation eight refrigerant pairs were studied including R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a, R744/R134a, R744/R290, R744/R600a, and R744/R717 at HT condenser of (70)°C and (75)°C. Hot water is to be produced at temperature range (60 to 65)°C with a proper flow demand. The evaporator temperature at the LT cycle side was ranged between (-10)°C and (-2)°C. The intermediate temperatures at the cascade heat exchanger were (20, 22.5, 33, and 35)°C depending on the refrigerant pairs implemented in the Cascade heat pump. Sea water at (7)°C was used as a sustainable low temperature heat source and 30% ethylene glycol-water brine as a thermal fluid carrier for heat extraction. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle evaporator. The R744/R134a and R744/R290 systems revealed the highest heat pump heating load production and highest compressors power consumption accompanied with the lowest COP at (20)°C intermediate temperature and HT condensation of (75)°C. R717/R600a showed the highest COP and lowest power consumption at (35)°C intermediate temperature and HT condensation of (70)°C. The results also revealed that a band of refrigerant pairs occupied the central zone of COP range with acceptable value; they are R410A/R134a, R407C/R134a and R744/R717.
| Published in | International Journal of Energy and Environmental Science (Volume 2, Issue 2) |
| DOI | 10.11648/j.ijees.20170202.12 |
| Page(s) | 36-47 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2017. Published by Science Publishing Group |
Sustainable Energy, Green Environment, Low Temperature Heat Source, Halogen Free Refrigerants
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APA Style
Ali H. Tarrad. (2017). Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants. International Journal of Energy and Environmental Science, 2(2), 36-47. https://doi.org/10.11648/j.ijees.20170202.12
ACS Style
Ali H. Tarrad. Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants. Int. J. Energy Environ. Sci. 2017, 2(2), 36-47. doi: 10.11648/j.ijees.20170202.12
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Download@article{10.11648/j.ijees.20170202.12,
author = {Ali H. Tarrad},
title = {Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants},
journal = {International Journal of Energy and Environmental Science},
volume = {2},
number = {2},
pages = {36-47},
doi = {10.11648/j.ijees.20170202.12},
url = {https://doi.org/10.11648/j.ijees.20170202.12},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijees.20170202.12},
abstract = {The Cascade heat pump system is commonly used to overcome the high temperature lift problem of the system. In the present investigation eight refrigerant pairs were studied including R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a, R744/R134a, R744/R290, R744/R600a, and R744/R717 at HT condenser of (70)°C and (75)°C. Hot water is to be produced at temperature range (60 to 65)°C with a proper flow demand. The evaporator temperature at the LT cycle side was ranged between (-10)°C and (-2)°C. The intermediate temperatures at the cascade heat exchanger were (20, 22.5, 33, and 35)°C depending on the refrigerant pairs implemented in the Cascade heat pump. Sea water at (7)°C was used as a sustainable low temperature heat source and 30% ethylene glycol-water brine as a thermal fluid carrier for heat extraction. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle evaporator. The R744/R134a and R744/R290 systems revealed the highest heat pump heating load production and highest compressors power consumption accompanied with the lowest COP at (20)°C intermediate temperature and HT condensation of (75)°C. R717/R600a showed the highest COP and lowest power consumption at (35)°C intermediate temperature and HT condensation of (70)°C. The results also revealed that a band of refrigerant pairs occupied the central zone of COP range with acceptable value; they are R410A/R134a, R407C/R134a and R744/R717.},
year = {2017}
}
TY - JOUR T1 - Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants AU - Ali H. Tarrad Y1 - 2017/03/29 PY - 2017 N1 - https://doi.org/10.11648/j.ijees.20170202.12 DO - 10.11648/j.ijees.20170202.12 T2 - International Journal of Energy and Environmental Science JF - International Journal of Energy and Environmental Science JO - International Journal of Energy and Environmental Science SP - 36 EP - 47 PB - Science Publishing Group SN - 2578-9546 UR - https://doi.org/10.11648/j.ijees.20170202.12 AB - The Cascade heat pump system is commonly used to overcome the high temperature lift problem of the system. In the present investigation eight refrigerant pairs were studied including R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a, R744/R134a, R744/R290, R744/R600a, and R744/R717 at HT condenser of (70)°C and (75)°C. Hot water is to be produced at temperature range (60 to 65)°C with a proper flow demand. The evaporator temperature at the LT cycle side was ranged between (-10)°C and (-2)°C. The intermediate temperatures at the cascade heat exchanger were (20, 22.5, 33, and 35)°C depending on the refrigerant pairs implemented in the Cascade heat pump. Sea water at (7)°C was used as a sustainable low temperature heat source and 30% ethylene glycol-water brine as a thermal fluid carrier for heat extraction. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle evaporator. The R744/R134a and R744/R290 systems revealed the highest heat pump heating load production and highest compressors power consumption accompanied with the lowest COP at (20)°C intermediate temperature and HT condensation of (75)°C. R717/R600a showed the highest COP and lowest power consumption at (35)°C intermediate temperature and HT condensation of (70)°C. The results also revealed that a band of refrigerant pairs occupied the central zone of COP range with acceptable value; they are R410A/R134a, R407C/R134a and R744/R717. VL - 2 IS - 2 ER -
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