I previously covered our MVHR system and now it’s time to look at the rest of our mechanical setup.
UPDATE – check out our running cost for the first full year
Electrification of Heating
Heating, just like transportation, will be increasingly electrified over the coming years. certainly the ‘Sixth Carbon Budget’ recently published by the climate change committee (December 2020) points to a future where there will be millions of heat pumps installed across the UK, predicting…
…a total of 5.5 million heat pumps installed in homes by 2030, of which 2.2 million are in new homes
Climate change Committee
Hitachi Yutaki heat Pump
There seemed little point in fitting another oil or gas fired boiler, in fact we chose not to burn anything anymore.
So the new Automated home is heated using this 11kW Hitachi Yutaki M Monobloc Air source heat Pump. This air to water unit supplies the Roth underfloor heating system on both floors as well as the 300 litre Joule Cyclone DHW tank.
There is plenty of FUD circulating on forums and Facebook groups about heat pumps. lots of ‘expert’ opinions from people that have never owned one or lived in a house with one. While there are unquestionably horror stories out there (as with every trade), a correctly spec’d heat pump, developed and installed by a real expert company like Daly Renewables, in a well insulated airtight house is an efficient solution.
Løbende udgifter?
The heat pump is controlled by our Loxone smart home system which is also collecting energy usage information as we go through our first winter season (more on that in a future post).
So while we’re still gathering the data to compare the running costs with our last similar-sized house and its oil-fired boiler, for now we can say that comfort levels are a substantial improvement. The house feels so much warmer than the old place (and we’ve been down to -6° so far this winter) and the big tank is always full of hot water.
[UPDATE – here are the figures for our first years running cost]
Time to turn to Ryan Daly once much more for an explanation of heat pumps and much more on the system that keeps the Automated home warm in the winter.
Heat Pumps Explained
Air Source Heat Pumps work using similar technology as ground source heat pumps, but instead of having pipe work buried in the ground they use the outside air as its energy source.
In the UK and Ireland, the outside air temperature rarely goes below -3°C. The heat or energy moves from hot to cold (the 2nd law of thermodynamics) and the refrigerant in the heat pump boils at very low temperatures of -30°C, so the difference between the outside air and refrigerant creates the energy that flows into the varmepumpe. An Air source heat Pump uses a fan to draw the outside air across the evaporator.
An Air source heat Pump will have an efficiency rating of roughly 350% to 470% depending on system design and installation. In easy terms, this implies that for every 1kW of electrical power that the heat pump uses to power the compressor, which is the main component in the heat pump, it will get the remaining 2.5kW to 3.7kW of energy from the air outside.
In comparison a fossil fuel gas or oil boiler will only ever be 70% to 95% efficient. The lower the heating system operating temperature the much more efficient the heat pump will be and for that reason this will result in lower running costs.
Heat Pumps are an optimal fit for new build homes which have an Underfloor Heating System installed as the water running through the UF Heating pipe work is less than 35oC. The system is developed to be left running and will maintain a constant temperature in the home and will always have the hot water tank heated ensuring ample hot water for showering and bathing. In the summer when the heating is not required the heat pump can heat hot water separately.
At Daly we recommend all our clients to work closely with their architect in purchase that they specify low U-values and come up with an air tightness brief to make the house a low energy dwelling from the outset. In our experience, our systems work really well in wood frame houses as they are well insulated and air tight but they can also carry out as well in masonry houses as long as the air tightness steps are applied correctly on site.
In terms of capital cost an air source heat pump will cost roughly £2,000 to £3,000 much more to install over a conventional oil or gas boiler system. depending on fossil fuel prices, the payback compared to an oil boiler system will be between 3 to 6 years. The main difference in an oil boiler and a heat pump is the fact that a heat pump has an inverter compressor which implies it can match the exact heat load of the house. It does this by varying the frequency of the inverter. The smallest oil boiler available is 15kW and has a high temperature heat output which is not developed for an UF Heating System.
If using UF HeatiNg med olie skal blandingsventiler monteres ved manifolds, hvilket reducerer temperaturen på vandet i systemet fra 80oC til 35oC. Dette resulterer i, at kedelcyklingen er meget mere typisk, hvilket resulterer i højere driftsomkostninger. At have blandingsventiler ved manifoldene skubber omkostningerne til UF -varmesystemet og tilføjer også vedligeholdelseskravene til systemet. Disse er ikke påkrævet, når du bruger en varmepumpe til at varme UF -opvarmningen, da varmepumpen kan matche den nøjagtige temperatur, som UF -opvarmningsbehovene ved hjælp af en proces kaldet vejrkompensation.
Vejrkompensation bruger en udendørs sensor, der er forbundet til varmepumpeenheden. Dette justerer automatisk strømningstemperaturen, der går gennem til huset gennem UF -opvarmningen i henhold til temperaturen udenfor. Denne intelligente operation hjælper med at reducere driftsomkostningerne endnu mere, da den vil gøre det muligt for varmepumpen at køre ved en lavere temperatur på mildere dage og øge den, når den bliver koldere udenfor. Ved at gøre dette hjælper det også med at opretholde den indendørs temperatur på et behageligt niveau kontinuerligt.
I huse, hvor vi har varmepumper installeret (tilbage 10 år nu), har vi fundet, at de almindelige årlige opvarmnings- og varmtvandsomkostninger forbundet med at have en luftkildevarmepumpe vil være i området £ 350,00 – £ 700,00 om året til Et gennemsnitligt 3.000 kvadratmeter stort hus. Dette er de elektriske omkostninger til at betjene kompressoren i varmepumpen. Sammenlignet med et oliekedel-system fungerer dette typisk på mellem 50-70% billigere afhængigt af husets energibelastning og brændstofpriserne. Elektriske effektpriser har en tendens til at forblive meget mere stabile end oliepriserne, og at vide, at din regning vil være meget mere eller mindre den samme hver måned giver klienter mulighed for at forelære det vigtigste familiebudget. Nogle klienter får en økonomi 7 -told installeret, hvor du får elektrisk strøm til mindre end halv pris i 7 timer om natten, hvilket kan være en meget overkommelig måde at betjene et varmepumpesystem på.
De andre vigtigste fordele, en varmepumpe har
Over en gas- eller oliekedel bortset fra de lavere driftsomkostninger er, at den ikke har nogen
skadelige emissioner, det kræver ikke regelmæssig vedligeholdelse, det kræver ikke
Brændstofoptioner hvert par måneder, da det bruger elektrisk strøm til at betjene det og dette
Implicerer også, at boligejeren kun har én brugsregning til hjemmet. Med mere
Energi end nogensinde kommer fra vedvarende kilder, ser vi varmepumper her i Irland
og Det Forenede Kongerige som en del og pakke med fremtidige energieffektive opvarmningsmuligheder.
Man behøver kun at se til Sverige, hvor
80% af alle husholdningshuse er allerede opvarmet af varmepumper.
Hos Daly har vi leveret og installeret Hitachi Yutaki -serien af luftkildevarmepumper i de sidste 7 år. Efter at have installeret hundreder i denne periode er vi blevet det mest betydningsfulde varmepumpeinstallatør i Nordirland og har opbygget en stor viden om produktet i denne periode. Enhederne leveres med en 7 -årig delgaranti, som er en af de bedste garantier i branchen, og vi har gennemført produktuddannelseskurser for at tilbyde en komplet eftersalgsupporttjeneste.
Kontakt dalyenewables.com for meget mere information.
Næste gang
I et fremtidig del 2 -indlæg ser vi på at kontrollere varmepumpen fra vores Loxon -system og driftsomkostningerne ved vores opvarmning. Husk i mellemtiden at tjekke vores Instagram for at følge projektet, læse resten af de automatiserede Home 2.0-blogmeddelelser og finde linkene til alle de produkter, vi har brugt i vores selvopbygning.
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