Techno-economic assessment of cascade air-to-water heat pump retrofitted into residential buildings using experimentally validated simulations
| Autor: | Christopher Wilson, Nikhilkumar Shah, Raymond Byrne, Khoa Xuan Le, Paul Mac Artain, Ming Jun Huang, Neil Hewitt |
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| Rok vydání: | 2019 |
| Předmět: |
020209 energy
Mechanical Engineering Nuclear engineering Techno economic 02 engineering and technology Building and Construction Management Monitoring Policy and Law TRNSYS Thermal energy storage Variable capacity 7. Clean energy law.invention Compensation (engineering) General Energy 020401 chemical engineering 13. Climate action law Cascade Greenhouse gas 0202 electrical engineering electronic engineering information engineering Environmental science 0204 chemical engineering Heat pump |
| Zdroj: | Applied Energy. 250:633-652 |
| ISSN: | 0306-2619 |
| DOI: | 10.1016/j.apenergy.2019.05.041 |
| Popis: | Cascade air-to-water heat pumps have better overall efficiency than single-stage air-to-water heat pumps when operating at low ambient temperatures for high temperature water supply. While many studies in the literature investigated the specific features of equipment performance of cascade heat pumps, there is little information about retrofit applications of these heat pumps in residential buildings using experimentally validated dynamic building simulations. In this study, the techno-economic assessment of a variable capacity cascade air-to-water heat pump retrofitted into residential buildings is conducted by means of experimentally validated TRNSYS simulations. The cascade heat pump coupled with thermal energy storage operating in different scenarios is further studied. Laboratory and field trial results were obtained to develop and validate a cascade heat pump model integrated with a dynamic building simulation model. Regarding the heat pump system without storage, the predicted annual COPs were almost below 2.5 at ambient temperatures of from −11.2 °C to 29.5 °C, even the heat pump adopted weather compensation control. Simulation results also indicated that the cascade heat pump could not defeat gas boilers and high-efficiency oil boilers (90%) in terms of operating costs, but there were CO 2 reductions (from 14% to 57%). As for the heat pump coupled with storage, simulation results showed that at ambient temperatures of between −5.6 °C and 23.8 °C, the continuous coupling between the heat pump and the storage revealed the lowest annual performance (actual COP of 1.41), while the direct heating obtained the highest efficiency (actual COP of 2.12) followed by the load-shifting (actual COP of 1.88). |
| Databáze: | OpenAIRE |
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