Experimental evaluation of a semi-open membrane-based absorption heat pump system utilizing ionic liquids
| Autor: | Kyle R. Gluesenkamp, Devesh Chugh, Abdy Fazeli, Ahmad Abu-Heiba, Viral K. Patel, Saeed Moghaddam, Morteza Alipanah, Michael Schmid, Richard P. Rode |
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| Rok vydání: | 2019 |
| Předmět: |
Desiccant
Materials science 020209 energy Mechanical Engineering Nuclear engineering Plate heat exchanger 02 engineering and technology Building and Construction Management Monitoring Policy and Law Refrigerant General Energy 020401 chemical engineering Heat exchanger 0202 electrical engineering electronic engineering information engineering Absorption heat pump 0204 chemical engineering Absorption (electromagnetic radiation) Condenser (heat transfer) Water vapor |
| Zdroj: | Applied Energy. 239:919-927 |
| ISSN: | 0306-2619 |
| Popis: | While the use of energy efficient absorption heat pumps has been typically limited to the high capacity commercial and industrial applications, the use of a semi-open absorption heat pump for water heating has been demonstrated to be an energy efficient alternative for residential scale applications. A semi-open absorption system uses ambient water vapor as the refrigerant in the absorber where its heat of phase change is transferred to the process water, cooling the solution in the absorber. The solution is pumped to the desorber, where by adding heat, the water vapor is released from the solution and condensed in the condenser. The heat of phase change of water vapor is transferred to process water again in the condenser. This cycle when implemented with a membrane-based absorber in a plate and frame form of heat exchanger using ionic liquids can overcome the challenges related to the system architecture of conventional absorption heat pumps like the lower efficiency at small scale, crystallization/corrosion issues with the desiccants and the high cost of hermetically sealed components. The cycle COP for such a system was previously demonstrated by Chugh et al. for high humidity conditions. In this experimental study, design improvements were made that expand the system’s applicability to more practical and standardized test conditions. With these improvements, the performance of the system was evaluated. The results presented in this study demonstrate the improved system’s viability as a heat pump water heater conforming to standard water heater test conditions. Performance was measured at a cycle thermal COP of 1.2 with a hot water delivery water temperature of 56 °C and ambient air at 19 °C and 49% RH. |
| Databáze: | OpenAIRE |
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