| Description |
1 online resource (ix, 40 pages) : illustrations (chiefly color) |
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text rdacontent |
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computer rdamedia |
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online resource rdacarrier |
| Note |
Title from title screen (viewed on Sept. 4, 2015). |
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"Prepared for the National Renewable Energy Laboratory on behalf of the U.S. Department of Energy's Building America Program, Office of Energy Efficiency and Renewable Energy." |
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"July 2013." |
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"NREL technical monitor: Michael Gestwick." |
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"DOE/GO-102013-3945." |
| Bibliography |
Includes bibliographical references (page 23). |
| Funding |
DE-AC36-08GO28308 |
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Prepared under subcontract no. KNDJ-0-40340-03 |
| Summary |
Characterizing the performance of hot water distribution systems is a critical step in developing best practice guidelines for the design and installation of high performance hot water systems. Developing and validating simulation models is critical to this effort, as well as collecting accurate input data to drive the models. In this project, the Building America research team ARBI validated the newly developed TRNSYS Type 604 pipe model against both detailed laboratory and field distribution system performance data. Validation efforts indicate that the model performs very well in handling different pipe materials, insulation cases, and varying hot water load conditions. Limitations of the model include the complexity of setting up the input file and long simulation run times. This project also looked at recent field hot water studies to better understand use patterns and potential behavioral changes as homeowners convert from conventional storage water heaters to gas tankless units. The team concluded that the current Energy Factor test procedure overestimates typical use and underestimates the number of hot water draws, which has implications for both equipment and distribution system performance. Gas tankless water heaters were found to impact how people use hot water, but the data does not necessarily suggest an increase in usage. Further study in hot water usage and patterns is needed to better define these characteristics in different climates and home vintages. |
| Added Author |
Hoeschele, Marc, author.
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United States. Department of Energy. Office of Building Technologies, issuing body.
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National Renewable Energy Laboratory (U.S.), sponsoring body.
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Building America (Program : U.S.), sponsoring body.
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| Gpo Item No. |
0429-A-90 (online) |
| Sudoc No. |
E 1.177:DOE/GO-102013-3945 |
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