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Optimisation of a recirculating domestic hot water system to minimise wait time and heat loss
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Moss, Roger W. and Critoph, R. E. (2022) Optimisation of a recirculating domestic hot water system to minimise wait time and heat loss. Energy and Buildings, 260 . 111850. doi:10.1016/j.enbuild.2022.111850 ISSN 0378-7788. [ 🗎 Public]. [ (✓) hoa:511 ]
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WRAP-optimisation-recirculating-domestic-hot-water-system-minimise-wait-time-heat-loss-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3426Kb) | Preview |
Official URL: https://doi.org/10.1016/j.enbuild.2022.111850
Abstract
Many houses suffer from a delay in hot water arrival, after opening the hot tap, due to the length of pipe work from the boiler or thermal store. Measurements in three properties showed delays of up to 46 s. A recirculation system could maintain the water in the pipe at a suitable temperature and for a 15 m pipe is expected to use 30 W less electrical power than a local thermal store at the delivery point. Time-steady eigenvector solutions to the linked temperature equations allow optimisation of the recirculation flow rate, pipe diameters and insulation thickness. The pumping power is <1 mW and a pumpless thermo-syphon system should be possible in some installations. Heat loss coefficients have been calculated for a pair of pipes in a common insulation sleeve to minimise the losses. A plug flow transient advection model for water and pipe temperature based on a sliding 1-D grid has been developed and validated for a single pipe, then extended to also model recirculating systems. Heat losses in a pumped system may be reduced using a timer so the system can cool overnight. The transient model predicts the relationship between flow and warm-up rate to optimise pump size and timing.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TH Building construction T Technology > TJ Mechanical engineering and machinery |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
| SWORD Depositor: | Library Publications Router | ||||||||
| Library of Congress Subject Headings (LCSH): | Insulation (Heat) , Thermosyphons , Hot-water heating , Hot-water heating -- Regulators , Hot-water supply | ||||||||
| Journal or Publication Title: | Energy and Buildings | ||||||||
| Publisher: | Elsevier Science SA | ||||||||
| ISSN: | 0378-7788 | ||||||||
| Official Date: | 1 April 2022 | ||||||||
| Dates: |
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| Volume: | 260 | ||||||||
| Article Number: | 111850 | ||||||||
| DOI: | 10.1016/j.enbuild.2022.111850 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 3 March 2022 | ||||||||
| Date of first compliant Open Access: | 4 March 2022 |
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