https://www.designingbuildings.co.uk/w/index.php?action=history&feed=atom&title=Solar-assisted_heat_pumpSolar-assisted heat pump - Revision history2026-05-14T08:33:54ZRevision history for this page on the wikiMediaWiki 1.17.4https://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=208028&oldid=prevDesigning Buildings at 08:49, 5 July 20212021-07-05T08:49:51Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 4: Solar thermal hot water systems DG 532 4.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 4: Solar thermal hot water systems DG 532 4.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Room-based heat pumps.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=189368&oldid=prevDesigning Buildings at 07:36, 12 January 20212021-01-12T07:36:51Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Water source heat pumps.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Water source heat pumps.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[Category:<del class="diffchange diffchange-inline">Sustainability</del>]] [[Category:<del class="diffchange diffchange-inline">Products_/_components</del>]] [[Category:DCN_Product_Knowledge]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[Category:<ins class="diffchange diffchange-inline">DCN_Definition</ins>]] [[Category:<ins class="diffchange diffchange-inline">DCN_Guidance</ins>]] [[Category:DCN_Product_Knowledge<ins class="diffchange diffchange-inline">]] [[Category:Sustainability]] [[Category:Products_/_components</ins>]]</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=168798&oldid=prevEditor at 14:35, 28 July 20202020-07-28T14:35:44Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat exchanger.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat exchanger.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Microgeneration Certification Scheme 2020.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 4: Solar thermal hot water systems DG 532 4.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 4: Solar thermal hot water systems DG 532 4.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Water source heat pumps.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Water source heat pumps.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[Category:Sustainability]] [[Category:Products_/_components]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[Category:Sustainability]] [[Category:Products_/_components<ins class="diffchange diffchange-inline">]] [[Category:DCN_Product_Knowledge</ins>]]</div></td></tr>
</table>Editorhttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=161573&oldid=prevEditor at 13:54, 13 May 20202020-05-13T13:54:34Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Air source heat pumps.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Air source heat pumps.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* BSRIA domestic hot water heat pumps testing.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* BSRIA domestic hot water heat pumps testing.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* BSRIA global heat pump market 2019.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Domestic heat pumps and the electricity supply system.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Domestic heat pumps and the electricity supply system.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Exhaust air heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Exhaust air heat pump.</div></td></tr>
</table>Editorhttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=134963&oldid=prevDesigning Buildings at 09:13, 11 May 20192019-05-11T09:13:14Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>If there is excess demand for hot water, back-up can be provided by connecting a boiler back into the system.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>If there is excess demand for hot water, back-up can be provided by connecting a boiler back into the system.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">= Find out more =</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>= Related articles on Designing Buildings Wiki =</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">==</del>= Related articles on Designing Buildings Wiki <del class="diffchange diffchange-inline">==</del>=</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Absorption heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Absorption heat pump.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Air source heat pumps.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Air source heat pumps.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* BSRIA domestic hot water heat pumps testing.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Domestic heat pumps and the electricity supply system.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Domestic heat pumps and the electricity supply system.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Exhaust air heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Exhaust air heat pump.</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=114887&oldid=prevDesigning Buildings at 07:40, 26 August 20182018-08-26T07:40:05Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Renewable energy sources: how they work and what they deliver: Part 4: Solar thermal hot water systems DG 532 4.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=114401&oldid=prevDesigning Buildings at 10:14, 18 August 20182018-08-18T10:14:44Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat exchanger.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat exchanger.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Heat pump.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Solar thermal heating.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Thermal labyrinths.</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=94176&oldid=prevDesigning Buildings at 07:44, 27 December 20172017-12-27T07:44:49Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A refrigerant fluid is run through the lower temperature source. The fluid ‘absorbs’ heat and boils. The resulting gas is then compressed, which further increases its temperature. The gas is passed into heat exchanger coils, where it condenses, releasing its latent heat. The process then repeats.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A refrigerant fluid is run through the lower temperature source. The fluid ‘absorbs’ heat and boils. The resulting gas is then compressed, which further increases its temperature. The gas is passed into heat exchanger coils, where it condenses, releasing its latent heat. The process then repeats.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>A solar-assisted heat pump (SAHP, sometimes referred to as a thermodynamic panel) <del class="diffchange diffchange-inline">is a mechanical device that </del>combines heat pump and <del class="diffchange diffchange-inline">thermal </del>solar thermal technologies into an integrated system. Heat is typically absorbed by <del class="diffchange diffchange-inline">an </del>aluminium <del class="diffchange diffchange-inline">panel </del>installed on an external wall or roof, <del class="diffchange diffchange-inline">typically </del>1 m x 2 m, although sizes can vary according to the building’s heat demand<del class="diffchange diffchange-inline">.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>A solar-assisted heat pump (SAHP, sometimes referred to as a thermodynamic panel) combines heat pump and solar thermal technologies into an integrated system. Heat is typically absorbed by aluminium <ins class="diffchange diffchange-inline">panels </ins>installed on an external wall or roof, <ins class="diffchange diffchange-inline">generally </ins>1 m x 2 m, although sizes can vary according to the building’s heat demand.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">If there is excess demand for hot water, back-up can be provided by connecting the boiler back into the system using a secondary coil fitted to the heat pump</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">If there is excess demand for hot water, back-up can be provided by connecting a boiler back into the system.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Find out more =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Find out more =</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=94175&oldid=prevDesigning Buildings at 07:42, 27 December 20172017-12-27T07:42:38Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A refrigerant fluid is run through the lower temperature source. The fluid ‘absorbs’ heat and boils. The resulting gas is then compressed, which further increases its temperature. The gas is passed into heat exchanger coils, where it condenses, releasing its latent heat. The process then repeats.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A refrigerant fluid is run through the lower temperature source. The fluid ‘absorbs’ heat and boils. The resulting gas is then compressed, which further increases its temperature. The gas is passed into heat exchanger coils, where it condenses, releasing its latent heat. The process then repeats.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>A solar-assisted heat pump is a mechanical device that combines heat pump and thermal solar <del class="diffchange diffchange-inline">panel </del>technologies <del class="diffchange diffchange-inline">in </del>an integrated system. <del class="diffchange diffchange-inline">The heat pump </del>is an aluminium panel <del class="diffchange diffchange-inline">that is </del>installed on an external wall or roof, typically 1 m x 2 m, although sizes can vary according to the building’s heat demand. If there is excess demand for hot water, back-up can be provided by connecting the boiler back into the system using a secondary coil fitted to the heat pump.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>A solar-assisted heat pump <ins class="diffchange diffchange-inline">(SAHP, sometimes referred to as a thermodynamic panel) </ins>is a mechanical device that combines heat pump and thermal solar <ins class="diffchange diffchange-inline">thermal </ins>technologies <ins class="diffchange diffchange-inline">into </ins>an integrated system. <ins class="diffchange diffchange-inline">Heat </ins>is <ins class="diffchange diffchange-inline">typically absorbed by </ins>an aluminium panel installed on an external wall or roof, typically 1 m x 2 m, although sizes can vary according to the building’s heat demand.</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>If there is excess demand for hot water, back-up can be provided by connecting the boiler back into the system using a secondary coil fitted to the heat pump.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater.</div></td></tr>
</table>Designing Buildingshttps://www.designingbuildings.co.uk/w/index.php?title=Solar-assisted_heat_pump&diff=94174&oldid=prevDesigning Buildings at 07:38, 27 December 20172017-12-27T07:38:03Z<p></p>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">A solar-assisted </del>heat <del class="diffchange diffchange-inline">pump is </del>a <del class="diffchange diffchange-inline">mechanical device that combines heat pump and thermal solar panel technologies in an integrated system </del>to <del class="diffchange diffchange-inline">generate energy efficiently</del>. <del class="diffchange diffchange-inline">Also, known as thermodynamics, </del>the heat <del class="diffchange diffchange-inline">pump is an aluminium panel that is installed on an external wall or roof</del>. They <del class="diffchange diffchange-inline">typically measure 1 m x 2 m, although sizes </del>can <del class="diffchange diffchange-inline">vary according </del>to <del class="diffchange diffchange-inline">the building’s </del>water <del class="diffchange diffchange-inline">demand</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Heat pumps transfer </ins>heat <ins class="diffchange diffchange-inline">from </ins>a <ins class="diffchange diffchange-inline">lower temperature source </ins>to <ins class="diffchange diffchange-inline">one of a higher temperature</ins>. <ins class="diffchange diffchange-inline">This is </ins>the <ins class="diffchange diffchange-inline">opposite of the natural flow of </ins>heat. They can <ins class="diffchange diffchange-inline">be used domestically or commercially </ins>to <ins class="diffchange diffchange-inline">provide hot </ins>water<ins class="diffchange diffchange-inline">, space heating (either by providing hot water for under-floor heating or radiators, or supplying hot air) or other applications such as heating swimming pools</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Unlike solar panels which absorb light energy, a heat pump is designed to absorb heat energy from the atmosphere and transform it into a gas by circulating a liquid </del>refrigerant <del class="diffchange diffchange-inline">at around -22 C </del>through <del class="diffchange diffchange-inline">veins in </del>the <del class="diffchange diffchange-inline">panel</del>. The <del class="diffchange diffchange-inline">temperature difference between this liquid and the outside air creates a </del>heat <del class="diffchange diffchange-inline">transfer</del>, <del class="diffchange diffchange-inline">compressing it </del>into <del class="diffchange diffchange-inline">hot fluid before passing through a </del>heat exchanger. The <del class="diffchange diffchange-inline">fluid is </del>then <del class="diffchange diffchange-inline">circulated again</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">A </ins>refrigerant <ins class="diffchange diffchange-inline">fluid is run </ins>through the <ins class="diffchange diffchange-inline">lower temperature source</ins>. The <ins class="diffchange diffchange-inline">fluid ‘absorbs’ </ins>heat <ins class="diffchange diffchange-inline">and boils. The resulting gas is then compressed</ins>, <ins class="diffchange diffchange-inline">which further increases its temperature. The gas is passed </ins>into heat exchanger <ins class="diffchange diffchange-inline">coils, where it condenses, releasing its latent heat</ins>. The <ins class="diffchange diffchange-inline">process </ins>then <ins class="diffchange diffchange-inline">repeats</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Although it benefits from direct sunlight, the </del>heat pump <del class="diffchange diffchange-inline">works like </del>a <del class="diffchange diffchange-inline">fridge </del>and can <del class="diffchange diffchange-inline">maintain temperatures 24 hours </del>a <del class="diffchange diffchange-inline">day</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">A solar-assisted </ins>heat pump <ins class="diffchange diffchange-inline">is </ins>a <ins class="diffchange diffchange-inline">mechanical device that combines heat pump </ins>and <ins class="diffchange diffchange-inline">thermal solar panel technologies in an integrated system. The heat pump is an aluminium panel that is installed on an external wall or roof, typically 1 m x 2 m, although sizes </ins>can <ins class="diffchange diffchange-inline">vary according to the building’s heat demand. If there is excess demand for hot water, back-up can be provided by connecting the boiler back into the system using </ins>a <ins class="diffchange diffchange-inline">secondary coil fitted to the heat pump</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">The benefits of solar-assisted heat pumps are that it can enable owners to provide hot water year-round at very low running costs. </del>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater<del class="diffchange diffchange-inline">.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Compared to solar thermal systems, which are less efficient during winter months, the potential energy savings are greater.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">If there is excess demand for hot water, back-up can be provided by connecting the boiler back into the system using a secondary coil fitted to the heat pump</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Find out more =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Find out more =</div></td></tr>
</table>Designing Buildings