Hello Mario, I’m in the UK, and all the things you outline in this video are true for the UK too, with building regulations, insulation requirements, SAP certificates etc. Please keep producing the content, it is very useful and detailed. People are still being given lots of misinformation about heat pumps.
Perfect explaining video! In fact, I opted for undersizing my heat pump! I put 16kw instead of 19kw... Let me explain, in Greece we use 0oC to calculate heat losses, but in my area 0 is happening 1-2 days/year, for 1-2 hours...so 99% of the time is > 5oC, and for the rest 1% the heat inertia of the house will Keep it warm enough so I don't have a problem. Indeed, 2 years now and the heat pump really hasn't reached its full power, ever!!! I don't suggest anyone doing it specially in more northern countries, but it proves how catastrophic oversizing is!!!
Excellent video, thank you. I think that after calculating heat losses in the software, it is advisable/essential to analyze the results to identify which elements have the highest heat losses. This helps to account for the imperfection of the initial data and improve insulation within a reasonable budget.
Great presentation as always. Really to the point, from skillful guys. Congratulations ! Same story here in Greece....oversized heat pumps, selected from commercial companies or plumbers, using only rule of thumbs because "they know"....Even though nZEB regulation is really close for new buildings in Greece (according to the current legislation, low energy buildings are the only way for someone wants to build a new home in Greece, even though it is still not so energy efficient as nZEB)
Zdravo Mario, opet ja. Moji 140 kvadrati su pokriveni sa 17 krugova u prosek po 70 metara po krug, podno je na 10cm. Koristim Panasonic Aquarea TCAP 9KW. Primetio sam da protokomeri ne mogu vise od 1.5 - 1.7 L/min. Ali to nije dovoljno, neke sobe su mi malo hladni 19C, a najtoplija sobe je neki 23.5C pri temperatura na polaz od 35C. Interesue me dali postoi mogucnost postoeca recirkulaciona pumpa da se zameni sa jaca, ili dali ima mogucnost seriski da rade dve pumpe. Ili pa najbolje resenje bi bilo puffer i dodatna pumpa?
Pumpa je i više nego dovoljna za te protoke i kvadraturu, treba izbalansirati sustav grijanja, a to rade firme koje se time bave. Ako protokomjer ne da više od toga, treba izračunati i vidjeti di je problem.
Another very important issue (as well difficult task....) is to combine the heating and cooling loads, so as to select the proper heat pump capacity, so as to avoid oversizing....In Mediterranean regions, cooling loads are the important and usually define heat pumps' selection, while other parameters like coincident factor in cooling use are challenging in the final decision....Selecting heat pump so as to cover cooling loads hides a risk to oversize in heating.....I suggest to prepare a video on this too....
@@HVACEducationHub I am not sure I understand what you mention. Since you have an air-to-water heat pump, you have a unique source, both for space heating/DHW production and cooling. Selecting the heat pump, means you select a model that provides specific cooling capacity. At the same time the same model provides a specific heating capacity. Covering cooling loads (which for Mediterranean climates is the most important, at least from my experience) leads to an oversized heat pump for heating. Except if you undersize heat pump for cooling, since statistically it seems that home owners cannot be at the same time both in bedrooms and in living room/kitchen. Still seems challenging to fine the best solution to cover heating and cooling true maximum load and at the same time not oversize heat pump
Radi se o LG Therma V 16kw sa baferom od 80L,radiatorsko grijanje 130m3,voda zadata na 42step,u sobi zadato na 22step,pratim stanje rada svaki dan i primečujem da pumpa cesče "GASI"odnosno na displeju pise (Rad spoljasne jedinice i rad pumpe za vodu)desava se da pumpa drzi vodu ulaz izlaz na 40-42step i prestane sa rad tad pise samo Rad pumpe za vodu tako oko 5min pa opet se pokrene spoljasna jedinica i sve tako u krug. Pitanje mi je jel pumpa skroz prekine sa rad i opet se pokrene ili radi na neki minimum pa se pokrene opet. Potrosnja za 12.2024 je bila 1300Kw samo pumpa. Pozz iz 🇲🇰
Kompresor stane jer postigne delta T i zahtjev prostora. To je uglavnom slučaj kad je minimum rada kompresora veći od potrebe objekta (npr. za 16 kW je to otprilike 4 kW, a objekt u tom trenu treba 3 kW)
Another excellent video, just to clarify in the example I assume that the 250 m'" 2 house is the floor area only or is it the floor, ceiling and outside walls representing 0.24 W/m'2? though you right that a great many heat pump installers do not do the sums or mis understand the principals of low temperature heating and so totally oversize the heat pump, it is very common problem in the UK( but is getting better) are you having a similar problem in Croatia?
Hello Mario, I’m in the UK, and all the things you outline in this video are true for the UK too, with building regulations, insulation requirements, SAP certificates etc. Please keep producing the content, it is very useful and detailed. People are still being given lots of misinformation about heat pumps.
Thanks a lot!
Yes, I am in contact with some of the UK designers and installers and assume that it is similar
Perfect explaining video!
In fact, I opted for undersizing my heat pump! I put 16kw instead of 19kw...
Let me explain, in Greece we use 0oC to calculate heat losses, but in my area 0 is happening 1-2 days/year, for 1-2 hours...so 99% of the time is > 5oC, and for the rest 1% the heat inertia of the house will Keep it warm enough so I don't have a problem.
Indeed, 2 years now and the heat pump really hasn't reached its full power, ever!!!
I don't suggest anyone doing it specially in more northern countries, but it proves how catastrophic oversizing is!!!
Thanks, great feedback. Actually, it is the same for every country, I explained that in one video: ruclips.net/video/5pwzqmVyowc/видео.html
Excellent video, thank you. I think that after calculating heat losses in the software, it is advisable/essential to analyze the results to identify which elements have the highest heat losses. This helps to account for the imperfection of the initial data and improve insulation within a reasonable budget.
Thanks and agree, double check is always a good idea.
Great presentation as always. Really to the point, from skillful guys. Congratulations ! Same story here in Greece....oversized heat pumps, selected from commercial companies or plumbers, using only rule of thumbs because "they know"....Even though nZEB regulation is really close for new buildings in Greece (according to the current legislation, low energy buildings are the only way for someone wants to build a new home in Greece, even though it is still not so energy efficient as nZEB)
Thank you very much. Yes, the same everywhere :D
Zdravo Mario, imam panasonic tcap 9kw, 140m2 podno bez pufer. Dali je ok da se pumpa gasi u prosek nakon 3 sati?
Pozdrav, svaki sustav je razlicit
Zdravo Mario, opet ja. Moji 140 kvadrati su pokriveni sa 17 krugova u prosek po 70 metara po krug, podno je na 10cm. Koristim Panasonic Aquarea TCAP 9KW. Primetio sam da protokomeri ne mogu vise od 1.5 - 1.7 L/min. Ali to nije dovoljno, neke sobe su mi malo hladni 19C, a najtoplija sobe je neki 23.5C pri temperatura na polaz od 35C.
Interesue me dali postoi mogucnost postoeca recirkulaciona pumpa da se zameni sa jaca, ili dali ima mogucnost seriski da rade dve pumpe. Ili pa najbolje resenje bi bilo puffer i dodatna pumpa?
Pumpa je i više nego dovoljna za te protoke i kvadraturu, treba izbalansirati sustav grijanja, a to rade firme koje se time bave. Ako protokomjer ne da više od toga, treba izračunati i vidjeti di je problem.
@HVACEducationHub dali moze magnetni filter da e problem? Ksto imam jedan krug od 100 i jedan od 97 metara
Sumnjam, ali treba provjeriti
@HVACEducationHub povecao sam max duty na 35 litara u min i sad je super
Another very important issue (as well difficult task....) is to combine the heating and cooling loads, so as to select the proper heat pump capacity, so as to avoid oversizing....In Mediterranean regions, cooling loads are the important and usually define heat pumps' selection, while other parameters like coincident factor in cooling use are challenging in the final decision....Selecting heat pump so as to cover cooling loads hides a risk to oversize in heating.....I suggest to prepare a video on this too....
Yes, this is the problem. This is one of the reason why I like separate system for cooling.
@@HVACEducationHub I am not sure I understand what you mention. Since you have an air-to-water heat pump, you have a unique source, both for space heating/DHW production and cooling. Selecting the heat pump, means you select a model that provides specific cooling capacity. At the same time the same model provides a specific heating capacity. Covering cooling loads (which for Mediterranean climates is the most important, at least from my experience) leads to an oversized heat pump for heating. Except if you undersize heat pump for cooling, since statistically it seems that home owners cannot be at the same time both in bedrooms and in living room/kitchen. Still seems challenging to fine the best solution to cover heating and cooling true maximum load and at the same time not oversize heat pump
I mean separate system for cooling. For example, air to water HP for heating + DHW and air to air for cooling
@@HVACEducationHub Yes, this is the best. But unfortunately most clients cannot support it...
Radi se o LG Therma V 16kw sa baferom od 80L,radiatorsko grijanje 130m3,voda zadata na 42step,u sobi zadato na 22step,pratim stanje rada svaki dan i primečujem da pumpa cesče "GASI"odnosno na displeju pise (Rad spoljasne jedinice i rad pumpe za vodu)desava se da pumpa drzi vodu ulaz izlaz na 40-42step i prestane sa rad tad pise samo Rad pumpe za vodu tako oko 5min pa opet se pokrene spoljasna jedinica i sve tako u krug.
Pitanje mi je jel pumpa skroz prekine sa rad i opet se pokrene ili radi na neki minimum pa se pokrene opet.
Potrosnja za 12.2024 je bila 1300Kw samo pumpa.
Pozz iz 🇲🇰
Kompresor stane jer postigne delta T i zahtjev prostora.
To je uglavnom slučaj kad je minimum rada kompresora veći od potrebe objekta (npr. za 16 kW je to otprilike 4 kW, a objekt u tom trenu treba 3 kW)
@ kako postici konstantni rad? bafer je na izlaz vode,topla ide direkt u radijatore
Treba vidjeti jel sustav dobro dimenzioniran, hidraulički balansiran, podešen. Teško je reći napamet.
Another excellent video, just to clarify in the example I assume that the 250 m'" 2 house is the floor area only or is it the floor, ceiling and outside walls representing 0.24 W/m'2? though you right that a great many heat pump installers do not do the sums or mis understand the principals of low temperature heating and so totally oversize the heat pump, it is very common problem in the UK( but is getting better) are you having a similar problem in Croatia?
Yes, floor area is that.
Similar is everywhere.