EuroSun2008-2

Future Work

Further testing is to be carried out, investigating wider ranges of temperatures and operating conditions. New heat exchanger relationships will be derived to better predict the effectiveness values, which will bring the model in to better agreement with the actual results. With the model

refined, full year simulations in TRNSYS will be carried out to determine seasonal solar fraction values for the ISAHP system.

5. Conclusion

The experimental results matched well with the simulated results for the compressor power input, but the simulation over predicted the performance on the system. The compressor power input ranged from 484 - 635 W, and the COP of the system ranged from 2.4 - 3.2 over the duration of the test. The computer model predicted the dynamic operation of the system well, except for a 12% overestimation of performance due to the model’s effectiveness relationships. New seasonal solar fraction values and life cycle cost numbers will be calculated once the full year simulations are completed in TRNSYS.

6. Acknowledgments

Support for this work was provided by the Solar Buildings Research Network of Canada, the Ontario Graduate Scholarship Program, and the Natural Science and Engineering Research Council of Canada.

References

[1] NRCan, (2006). Energy Use Data Handbook, Natural Resources Canada.

[2] C. Aguilar, D. J. White, D. L. Ryan, (2005). Domestic Water Heating and Water Heater Energy Consumption in Canada, Canadian Building Energy End-Use Data and Analysis Centre

[3] G. A. Freeman, (1997). Indirect Solar-Assisted Heat Pumps for Application in the Canadian Environment, Masters Thesis, Department of Mechanical Engineering, Queen’s University.

[4] G. A. Freeman, S. J. Harrison, (1997). Solar Assisted Heat Pump Hot Water Heaters for the Canadian Environment, Proceedings of 1997 SESCI Conference, Vancouver, BC.

[5] K. Chaturvedi, J. Y. Shen, (1982). Analysis of Two-Phase Flow Solar Collectors with Application to Heat Pumps, Journal of Solar Energy Engineering, Vol. 104, 358

[6] Morrison, G. L, (1994). Simulation of Packaged Solar Heat-Pump Water Heaters, Solar Energy, Vol. 53, 249

[7] P. Sporn, E. R. Ambrose, (1955). The Heat Pump and Solar Energy, Proceedings of the World Symposium on Applied Solar Energy, Phoenix, Ariz.

[8] Chaturvedi, K., Abazeri, M, (1987). Transient Simulation of a Capacity-Modulated Direct-Expansion, Solar-Assisted Heat Pump, Journal of Solar Energy, Vol. 39, 441

[9] B. J. Huang, J. P. Chyng, (1998). Integral-Type Solar-Assisted Heat Pump Water Heater, Journal of Renewable Energy, Vol. 16, 731

[10] B. J. Huang, C. P. Lee, (2003). Long-Term Performance of Solar-Assisted Heat Pump Water Heater, Journal of Renewable Energy, Vol. 29, 633

[11] J. M. Purdy, S. J. Harrison, P.H. Oosthuizen, (1998). Compact Heat Exchanger Evaluation for Natural Convection Applications, Proceedings of the 11th IHTC Heat Transfer 1998, Korea, Vol. 6, 305

[12] University of Wisconsin, Solar Energy Laboratory, (2006). TRNSYS: A Transient Simulation Program, Madison

[13] A. Bridgeman, S. J. Harrison, (2008). Preliminary Experimental Evaluation of Indirect Solar Assisted Heat Pump Systems, Proceedings for The 3rd Annual Canadian Solar Buildings Conference, Fredericton, NB

[14] A. H. Fanney, S. A. Klein, (1988). Thermal Performance Comparisons for Solar Hot Water Systems Subjected to Various Collector Array Flow Rates, Proceedings of Intersol 85, Montreal, QC.

EuroSun2008-2

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