References
- Çağlar, A., and C. Yamalı. 2012. Performance analysis of a solar-assisted heat pump with an evacuated tubular collector for domestic heating. Energy & Buildings 54:22–28. doi:10.1016/j.enbuild.2012.08.003.
- Cerit, E., and L. B. Erbay. 2013. Investigation of the effect of rollbond evaporator design on the performance of direct expansion heat pump experimentally. Energy Conversion and Management 72:163–70. doi:10.1016/j.enconman.2012.09.034.
- Chow, T. T., G. Pei, K. F. Fong, Z. Lin, A. L. S. Chan, and M. He. 2010. Modeling and application of direct-expansion solar-assisted heat pump for water heating in subtropical Hong Kong. Applied Energy 87 (2):643–49. doi:10.1016/j.apenergy.2009.05.036.
- Deng, W., and J. Yu. 2016. Simulation analysis on dynamic performance of a combined solar/air dual source heat pump water heater. Energy Conversion and Management 120:378–87. doi:10.1016/j.enconman.2016.04.102.
- Ding, G., X. Ma, P. Zhang, W. Han, S. Kasahara, and T. Yamaguchi. 2009. Practical methods for measuring refrigerant mass distribution inside refrigeration system. International Journal of Refrigeration 32 (2):327–34. doi:10.1016/j.ijrefrig.2008.05.002.
- Hassanien, R. H. E., M. Li, and Y. Tang. 2018. The evacuated tube solar collector assisted heat pump for heating greenhouses. Energy & Buildings 169:305–18. doi:10.1016/j.enbuild.2018.03.072.
- Huang, B. J., and J. P. Chyng. 2001. Performance characteristics of integral type solar-assisted heat pump. Solar Energy 71 (6):403–14. doi:10.1016/S0038-092X(01)00076-7.
- Ito, S., N. Miura, and K. Wang. 1999. Performance of a heat pump using direct expansion solar collectors. Paper presented at the ISES solar world congress, Taejon, South Korea, 24–29 August 1997.1. Solar Energy 65 (3):189–96. doi:10.1016/S0038-092X(98)00124-8.
- James, A., M. Mohanraj, M. Srinivas, and S. Jayaraj. 2021. Thermal analysis of heat pump systems using photovoltaic-thermal collectors: a review. Journal of Thermal Analysis and Calorimetry 144 (1):1–39. doi:10.1007/s10973-020-09431-2.
- Ji, W., J. Cai, J. Ji, and W. Huang. 2020. Experimental study of a direct expansion solar-assisted heat pump (DX-SAHP) with finned-tube evaporator and comparison with conventional DX-SAHP. Energy & Buildings 207:109632. doi:10.1016/j.enbuild.2019.109632.
- Kong, X., P. Sun, S. Dong, K. Jiang, and Y. Li. 2018. Experimental performance analysis of a direct-expansion solar-assisted heat pump water heater with R134a in summer. International Journal of Refrigeration 91:12–19. doi:10.1016/j.ijrefrig.2018.04.021.
- Kong, X., Y. Yang, M. Zhang, Y. Li, and J. Li. 2020. Experimental investigation on a direct-expansion solar-assisted heat pump water heater using R290 with micro-channel heat transfer technology during the winter period. International Journal of Refrigeration 113:38–48. doi:10.1016/j.ijrefrig.2020.01.019.
- Kong, X., X. Yan, Z. Yue, P. Zhang, and Y. Li. 2022. Influence of refrigerant charge and condenser area on direct-expansion solar-assisted heat pump system for radiant floor heating. Solar Energy 247:499–509. doi:10.1016/j.solener.2022.10.051.
- Kong, X., M. Zhang, Y. Yang, Y. Li, and D. Wang. 2020. Comparative experimental analysis of direct-expansion solar-assisted heat pump water heaters using R134a and R290. Solar Energy 203:187–96. doi:10.1016/j.solener.2020.04.048.
- Kuang, Y. H., and R. Z. Wang. 2006. Performance of a multi-functional direct-expansion solar assisted heat pump system. Solar Energy 80 (7):795–803. doi:10.1016/j.solener.2005.06.003.
- Lazzarin, R. 2020. Heat pumps and solar energy: a review with some insights in the future. International Journal of Refrigeration 116:146–60. doi:10.1016/j.ijrefrig.2020.03.031.
- Li, J., S. Wei, Y. Dong, X. Liu, and V. Novakovic. 2023. Technical and economic performance study on winter heating system of air source heat pump assisted solar evacuated tube water heater. Applied Thermal Engineering 221:119851. doi:10.1016/j.applthermaleng.2022.119851.
- Marques Humia, G., W. Moreira Duarte, J. Jose Garcia Pabon, T. de Freitas Paulino, and L. Machado. 2021. Experimental study and simulation model of a direct expansion solar assisted heat pump to CO2 for water heating: Inventory, coefficient of performance and total equivalent warming impact. Solar Energy 230:278–97. doi:10.1016/j.solener.2021.10.018.
- Mohanraj, M., Y. Belyayev, S. Jayaraj, and A. Kaltayev. 2018b. Research and developments on solar assisted compression heat pump systems – a comprehensive review (part-B: applications). Renewable and Sustainable Energy Reviews 83:124–55. doi:10.1016/j.rser.2017.08.086.
- Mohanraj, M., S. Jayaraj, and C. Muraleedharan. 2008. Modeling of a direct expansion solar assisted heat pump using artificial neural networks. International Journal of Green Energy 5 (6):520–32. doi:10.1080/15435070802498499.
- Palmiter, L., J.-H. Kim, B. Larson, P. W. Francisco, E. A. Groll, and J. E. Braun. 2011. Measured effect of airflow and refrigerant charge on the seasonal performance of an air-source heat pump using R-410A. Energy & Buildings 43 (7):1802–10. doi:10.1016/j.enbuild.2011.03.026.
- Rabelo, S. N., T. F. Paulino, L. Machado, and W. M. Duarte. 2019. Economic analysis and design optimization of a direct expansion solar assisted heat pump. Solar Energy 188:164–74. doi:10.1016/j.solener.2019.05.072.
- Sánchez-Moreno-Giner, L., T. Methler, F. Barceló-Ruescas, and J. Gonzalvez-Maciá. 2022. Refrigerant charge distribution in brine-to-water heat pump using R290 as refrigerant. International Journal of Refrigeration. doi:10.1016/j.ijrefrig.2022.10.013.
- Sezen, K., and A. Gungor. 2023. Comparison of solar assisted heat pump systems for heating residences: a review. Solar Energy 249:424–45. doi:10.1016/j.solener.2022.11.051.
- Shao, N., L. Ma, and J. Zhang. 2020. Experimental investigation on the performance of direct-expansion roof-PV/T heat pump system. Energy 195:116959. doi:10.1016/j.energy.2020.116959.
- Sporn, P., and E. R. Ambrose. 1955. The heat pump and solar energy proceedings of the world symposium on applied. Solar Energy 11:1–5. doi:10.1007/s11831-020-09495-1.
- Sun, X., Y. Dai, V. Novakovic, J. Wu, and R. Wang. 2015. Performance comparison of direct expansion solar-assisted heat pump and conventional air source heat pump for domestic hot water. Energy Procedia 70:394–401. doi:10.1016/j.egypro.2015.02.140.
- Sun, X., J. Wu, Y. Dai, and R. Wang. 2014. Experimental study on roll-bond collector/evaporator with optimized-channel used in direct expansion solar assisted heat pump water heating system. Applied Thermal Engineering 66 (1):571–79. doi:10.1016/j.applthermaleng.2014.02.060.
- Tagliafico, L. A., F. Scarpa, and F. Valsuani. 2014. Direct expansion solar assisted heat pumps – a clean steady state approach for overall performance analysis. Applied Thermal Engineering 66 (1):216–26. doi:10.1016/j.applthermaleng.2014.02.016.
- Xu, C., H. Yang, X. Yu, H. Ma, M. Chen, and M. Yang. 2021. Performance analysis for binary mixtures based on R245fa using in high temperature heat pumps. Energy Conversion and Management: X 12:100123. doi:10.1016/j.ecmx.2021.100123.
- Yu, X., Z. Guo, Z. Gao, B. Yang, X. Ma, and S. Dong. 2023. Thermodynamic investigation of a direct-expansion solar assisted heat pump with evacuated tube collector-evaporator. Renewable Energy 206:418–27. doi:10.1016/j.renene.2023.01.112.
- Zhang, D., Q. B. Wu, J. P. Li, and X. Q. Kong. 2014. Effects of refrigerant charge and structural parameters on the performance of a direct-expansion solar-assisted heat pump system. Applied Thermal Engineering 73 (1):522–28. doi:10.1016/j.applthermaleng.2014.07.077.
- Zhou, J., X. Ma, X. Zhao, Y. Yuan, M. Yu, and J. Li. 2020. Numerical simulation and experimental validation of a micro-channel PV/T modules based direct-expansion solar heat pump system. Renewable Energy 145:1992–2004. doi:10.1016/j.renene.2019.07.049.