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Thermodynamic and heat transfer analysis of a carbon – ammonia adsorption heat pump
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Rivero Pacho, Angeles M. (2014) Thermodynamic and heat transfer analysis of a carbon – ammonia adsorption heat pump. PhD thesis, University of Warwick.
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WRAP_THESIS_Rivero-Pacho_2014.pdf - Submitted Version - Requires a PDF viewer. Download (15Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b2751675~S1
Abstract
The modelling, design, construction and experimental testing of a carbon-ammonia adsorption heat pump is presented. The main objective of the research was to computer simulate and test a 4-beds thermal wave adsorption cycle and to improve the heat transfer rate in an existing shell and tube generator.
The existing generators were shell and tube type and were made of nickel brazed stainless steel but their heat transfer performance was poor. New heat exchangers with same design but larger in size were manufactured.
The sorbent material, active carbon, was tested in order to characterise its thermal properties and a new generator filling technique was developed and presented.
Computational modelling was carried out to evaluate the performance of the 4-beds thermal wave adsorption cycle. The proposed system was an air source heat pump that could deliver an output heating power of 7 kW and a seasonal heating COP of 1.47.
The adsorption generators were tested in a 4-bed thermal wave air-source heat pump system and achieved heating output powers between 4.5 to 5.20 kW if taking into account the system heat losses (4.30 to 4.90 kW without heat losses) and heating COP’s of between 1.26 and 1.31 if taking into account the system heat losses (1.13 to 1.18 kW without heat losses).
These values were significantly lower than the predicted performance of the simulation. The main cause of this discrepancy was the water distributors located at the end of the generators that distorted during the testing stage and blocked the tubes of the generators.
| Item Type: | Thesis or Dissertation (PhD) | ||||
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| Subjects: | T Technology > TP Chemical technology | ||||
| Library of Congress Subject Headings (LCSH): | Heat pumps -- Design and construction, Adsorption -- Computer simulation | ||||
| Official Date: | April 2014 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | School of Engineering | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Critoph, Robert E. | ||||
| Extent: | xxiv, 219 leaves : illustrations, charts | ||||
| Language: | eng |
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