Show simple item record

dc.creatorParker, Brandon DeWayneen_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionIssued also on microfiche from Lange Micrographics.en_US
dc.description.abstractThe effects of outdoor heat exchanger hydrophobic treatment on the performance of an air source heat pump were investigated. The base case tests used a bare aluminum outdoor heat exchanger in the experimental setup. The base case test results were compared to tests that utilized coated aluminum outdoor heat exchangers. The overall performance of each test was analyzed. These tests were carried out for cooling and heating mode conditions. The adhesion strength of water droplets to a bare aluminum surface, a silicone resin coated aluminum surface, and an acrylic resin coated aluminum surface were catalogued and compared. The angle at which the water droplet released from the surface was used as the measure of adhesion strength. The adhesion strength was measured through a range of temperatures. At 1.1C the adhesion strengths of the droplets were found to be 590 for bare aluminum, 34' for acrylic coated aluminum, and 24' for silicone coated aluminum. Hence, water droplets would release from the surface quicker for silicone resin surface than for the other two surfaces. The coatings were not found to have any detrimental effects on the cooling performance parameters of the heat pump. For the cooling mode testing condition, the coatings were within 2.4% of the base coil for the system EER, power consumption, and the system capacity. For frost/defrost testing conditions, it was generally found that the coated outdoor heat exchangers produced longer frost/defrost cycle times than the base coil. In general, the defrost times were found to be less for the coated coils than the base coil. During the heating mode, the coating did not significantly effect the integrated capacity, integrated total system power consumption, or the integrated cyclic coefficient of performance of the heat pump. Overall, the results of this study showed that hydrophobically coating the outdoor heat exchanger of a split system heat pump could be used to increase the heating performance by decreasing the frequency of defrost cycles. Potentially, if the coating could be applied thin enough, increased heating performance could be obtained from the heat transfer enhancement of the outdoor heat exchanger.en_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectmechanical engineering.en_US
dc.subjectMajor mechanical engineering.en_US
dc.titleThe Effects of Outdoor Heat Exchanger Hydrophobic Treatment on the Performance of an Air Source Heat Pumpen_US
dc.typeThesisen_US engineeringen_US
dc.format.digitalOriginreformatted digitalen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.

Request Open Access