The present investigation deals with the performance assessment of Cascade heat pump plants. The overall power consumption for a Cascade system for typical heat pump characteristics was studied. Four environment friendly refrigerant pairs R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a were investigated at low temperature cycle (LT) evaporator and high temperature cycle (HT) condenser temperatures of (-15 to -4)°C and (70)°C respectively. A preliminary heat pump plant is suggested to produce (500) kW heat output load as hot water demand at (65)°C with (25)°C temperature lift and a proper circulation rate. The investigation was carried out at cascade heat exchanger intermediate temperature (IT) of (33)°C and (35)°C. Sea water at (7)°C was used as a sustainable low temperature heat source and (30%) ethylene glycol-water brine at temperature of (5)°C as a thermal fluid heat carrier at the LT cycle evaporator. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle. The heat pump heating coefficient of performance (COP) revealed an increase fell within the range of (5-7.5)% higher than that of the plant heating COP value for the studied refrigerant pairs at the whole investigated operating conditions range. The higher IT exhibited the highest heat pump and plant heating COP than those at the lower value. R717/R600a showed the highest heating COP, lower power consumption and lower global warming potential (GWP) among other investigated refrigerant pairs. The power consumed by auxiliary pumps to circulate thermal fluid heat carriers through a heat pump may account to (4-4.5)% and (2-3)% of the extracted and output heating loads respectively, higher values could be expected for real plant. Two polynomial correlations for the assessment of the pumping power in terms of the extracted and output heating loads were derived from the present work.
| Published in | International Journal of Economy, Energy and Environment (Volume 2, Issue 2) |
| DOI | 10.11648/j.ijeee.20170202.11 |
| Page(s) | 13-24 |
| 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 |
Renewable Energy, Clean Environment, Low Temperature Heat Source, Plant Assessment
| [1] | Jang, S. W. and Lee, Y. L., Study on improving the performance of the Cascade heat pump cycle using ejectors”, Indian Journal of Science and Technology, 8 (30), 2015. DOI:10.17485/ijst/2015/v8i30/73895. |
| [2] | Kasi, P., Simulation of thermodynamic analysis of Cascade refrigeration systems with alternative refrigerants, International Journal of Mechanical Engineering and Technology (IJMET), 6 (1), pp. 71-91, 2015. |
| [3] | Bertsch, S., Uhlmann, M., and Heldstab, A., Heat pump with two heat sources on different temperature levels, International Refrigeration and Air Conditioning Conference, 14th July (2014), Paper 1372, Purdue University, USA, 2014. http://docs.lib.purdue.edu/iracc/1372. |
| [4] | Tarrad, A. H., Thermodynamic analysis for hybrid low temperature sustainable energy sources in Cascade heat pump technology, Asian Journal of Engineering and Technology (AJET), 5 (2), pp 29-46, 2017. |
| [5] | Kim, D. H., Park, H. S., and Kim, M. S., Optimal temperature between high and low stage cycles for R134a/R410A Cascade heat pump based water heater system”, Experimental Thermal and Fluid Sci., 47, 172-179, 2013. |
| [6] | Baker, A. and Schaefermeyer, D., Sea water heat pump project, Alaska Center for Energy and Power (ACEP) Rural Energy Conference Forum, 2013. |
| [7] | Kim D. H. and Kim M. S., The effect of water temperature lift on the performance of Cascade heat pump system, Appl. Therm. Eng.; 67, 273-282, 2014. |
| [8] | Yrjölä, J. and Laaksonen, E., “Domestic hot water production with ground source heat pump in apartment buildings”, Energies, 8, 8447-8466, 2015. DOI: 10.3390/en8088447. |
| [9] | Song, Y., Li, D., Yang, D., Jin, L., Cao, F., and Wang, X., Performance comparison between the combined R134a/CO2 heat pump and Cascade R134a/CO2 heat pump for space heating, International Journal of Refrigeration, 2016. DOI:10.1016/j.ijrefrig. 2016.12.001. |
| [10] | Kim, J., Lee, J. Choi, H, Lee S., Oh, S. and Park, W., Experimental study of R134a/R410A Cascade cycle for variable refrigerant flow heat pump systems, Journal of Mechanical Science and Technology, 29 (12), pp 5447-5458, 2015. DOI: 10.1007/s12206-015-1146-2. |
| [11] | Tarrad, A. H., Thermodynamic performance evaluation for low temperature heat source Cascade system circulating environment friendly refrigerants, International Journal of Energy and Environmental Science, 2 (2), pp 36-47, 2017. DOI: 10.11648/j.ijees.20170202.12. |
| [12] | Tarrad, A. H., Thermodynamic evaluation for intermediate temperature optimization in low temperature heat source Cascade heat pump technology, accepted for publication in International Journal of Environmental Science (IJES), 2017. |
| [13] | Technical University of Denmark (DTU), “CoolPack: A Collection of Simulation Tools for Refrigeration”, Denmark, 2001. |
| [14] | Anonymous, Domestic Ground Source Heat Pumps: Design and installation of closed-loop systems, report, pp. 10, CE82 © Energy Saving Trust June 2007, (2007 edition). Papers-24, www.icax.co.uk. |
APA Style
Ali H. Tarrad. (2017). Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source. International Journal of Economy, Energy and Environment, 2(2), 13-24. https://doi.org/10.11648/j.ijeee.20170202.11
ACS Style
Ali H. Tarrad. Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source. Int. J. Econ. Energy Environ. 2017, 2(2), 13-24. doi: 10.11648/j.ijeee.20170202.11
AMA Style
Ali H. Tarrad. Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source. Int J Econ Energy Environ. 2017;2(2):13-24. doi: 10.11648/j.ijeee.20170202.11
Share This Article
Twitter
Linked In
Facebook
Copy
Download@article{10.11648/j.ijeee.20170202.11,
author = {Ali H. Tarrad},
title = {Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source},
journal = {International Journal of Economy, Energy and Environment},
volume = {2},
number = {2},
pages = {13-24},
doi = {10.11648/j.ijeee.20170202.11},
url = {https://doi.org/10.11648/j.ijeee.20170202.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijeee.20170202.11},
abstract = {The present investigation deals with the performance assessment of Cascade heat pump plants. The overall power consumption for a Cascade system for typical heat pump characteristics was studied. Four environment friendly refrigerant pairs R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a were investigated at low temperature cycle (LT) evaporator and high temperature cycle (HT) condenser temperatures of (-15 to -4)°C and (70)°C respectively. A preliminary heat pump plant is suggested to produce (500) kW heat output load as hot water demand at (65)°C with (25)°C temperature lift and a proper circulation rate. The investigation was carried out at cascade heat exchanger intermediate temperature (IT) of (33)°C and (35)°C. Sea water at (7)°C was used as a sustainable low temperature heat source and (30%) ethylene glycol-water brine at temperature of (5)°C as a thermal fluid heat carrier at the LT cycle evaporator. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle. The heat pump heating coefficient of performance (COP) revealed an increase fell within the range of (5-7.5)% higher than that of the plant heating COP value for the studied refrigerant pairs at the whole investigated operating conditions range. The higher IT exhibited the highest heat pump and plant heating COP than those at the lower value. R717/R600a showed the highest heating COP, lower power consumption and lower global warming potential (GWP) among other investigated refrigerant pairs. The power consumed by auxiliary pumps to circulate thermal fluid heat carriers through a heat pump may account to (4-4.5)% and (2-3)% of the extracted and output heating loads respectively, higher values could be expected for real plant. Two polynomial correlations for the assessment of the pumping power in terms of the extracted and output heating loads were derived from the present work.},
year = {2017}
}
TY - JOUR T1 - Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source AU - Ali H. Tarrad Y1 - 2017/06/05 PY - 2017 N1 - https://doi.org/10.11648/j.ijeee.20170202.11 DO - 10.11648/j.ijeee.20170202.11 T2 - International Journal of Economy, Energy and Environment JF - International Journal of Economy, Energy and Environment JO - International Journal of Economy, Energy and Environment SP - 13 EP - 24 PB - Science Publishing Group SN - 2575-5021 UR - https://doi.org/10.11648/j.ijeee.20170202.11 AB - The present investigation deals with the performance assessment of Cascade heat pump plants. The overall power consumption for a Cascade system for typical heat pump characteristics was studied. Four environment friendly refrigerant pairs R717/R134a, R410A/R134a, R407C/R134a, and R717/R600a were investigated at low temperature cycle (LT) evaporator and high temperature cycle (HT) condenser temperatures of (-15 to -4)°C and (70)°C respectively. A preliminary heat pump plant is suggested to produce (500) kW heat output load as hot water demand at (65)°C with (25)°C temperature lift and a proper circulation rate. The investigation was carried out at cascade heat exchanger intermediate temperature (IT) of (33)°C and (35)°C. Sea water at (7)°C was used as a sustainable low temperature heat source and (30%) ethylene glycol-water brine at temperature of (5)°C as a thermal fluid heat carrier at the LT cycle evaporator. The evaluation of the thermal performance of the refrigerant pairs was based on a fixed heat pump extraction load at the LT cycle. The heat pump heating coefficient of performance (COP) revealed an increase fell within the range of (5-7.5)% higher than that of the plant heating COP value for the studied refrigerant pairs at the whole investigated operating conditions range. The higher IT exhibited the highest heat pump and plant heating COP than those at the lower value. R717/R600a showed the highest heating COP, lower power consumption and lower global warming potential (GWP) among other investigated refrigerant pairs. The power consumed by auxiliary pumps to circulate thermal fluid heat carriers through a heat pump may account to (4-4.5)% and (2-3)% of the extracted and output heating loads respectively, higher values could be expected for real plant. Two polynomial correlations for the assessment of the pumping power in terms of the extracted and output heating loads were derived from the present work. VL - 2 IS - 2 ER -
Information
Email: