ᐅ Combined ventilation and heat pump system or separate units
Created on: 10 Dec 2017 16:57
M
MangoLychee
Hello everyone,
We are building a single-family house with Poroton 36.5 blocks filled with zeolite, about 180 sqm (1,937 sq ft) with a basement. We plan to install a heat pump and want to have a ventilation system as well.
The electrician recommends a combined unit that includes both ventilation and heat pump.
The heating engineer doesn’t see any advantage in that.
The electrician suggested Stiebel; apparently, they won an innovation award for the combined unit.
The heating engineer isn’t very confident in that company.
So now we’re stuck, with each professional recommending something different.
What are your experiences? What are the pros and cons of a combined unit? Which company would you recommend?
Are combined units only available as indoor installations? So far, we have always planned for outdoor installation.
Thanks for your tips, we’re a bit puzzled right now...
Best regards
We are building a single-family house with Poroton 36.5 blocks filled with zeolite, about 180 sqm (1,937 sq ft) with a basement. We plan to install a heat pump and want to have a ventilation system as well.
The electrician recommends a combined unit that includes both ventilation and heat pump.
The heating engineer doesn’t see any advantage in that.
The electrician suggested Stiebel; apparently, they won an innovation award for the combined unit.
The heating engineer isn’t very confident in that company.
So now we’re stuck, with each professional recommending something different.
What are your experiences? What are the pros and cons of a combined unit? Which company would you recommend?
Are combined units only available as indoor installations? So far, we have always planned for outdoor installation.
Thanks for your tips, we’re a bit puzzled right now...
Best regards
M
Mastermind128 Dec 2017 23:01[A air-source heat pump is what we want.
We will definitely lean more towards what the heating engineer recommends. It’s confusing when you get different advice. He just mentioned that he’s not particularly fond of the brand Stiebel but didn’t have any objections to combination units in general.
Thanks for your tips, tomorrow we will meet with the heating engineer.
Is there a real advantage between separate devices and a combination unit?
We’re already concerned about space requirements with the combination unit, since the air-source heat pump will be located in the basement. The air pump was originally planned to be outside the house.
Best regards] Are you aware that a heating engineer is ultimately a salesperson?
Get a heating load calculation plus a heat demand calculation done.
With these, you can calculate whether an air-source heat pump with controlled mechanical ventilation is really suitable for you, or if the electric backup heater will be running continuously during winter.
First, you need to know the heating capacity required at the design temperature (-x degrees Celsius depending on location). Then, based on the desired room temperatures, you calculate your heat demand.
With that, you can compare the electricity consumption of the systems.
Simple example:
Heat demand 12,000 kWh including hot water.
Air-source heat pump with a realistic seasonal performance factor of 3:
12,000 ÷ 3 = 4,000 kWh electricity consumption.
Ground-source heat pump with a realistic seasonal performance factor of 5:
12,000 ÷ 5 = 2,400 kWh electricity consumption.
That’s 1,600 kWh electricity saved, which at $0.25 per kWh results in savings of about $400 per year.
If you now build an honest KfW40 or passive house, the calculation of course looks different. The potential savings become very, very small.
By the way, currently there are very good subsidies for geothermal energy (drilling) of €4,000–5,000 (about $4,400–5,500). Please take that into account! There are also very good alternatives to geothermal drilling such as energy baskets or trench collectors. Trench collectors can be made for around €1,000 (about $1,100), or installed through one of the providers (ask in the forum)...
P.S. The heating load calculation should also include a pipe network calculation for the underfloor heating system...
We will definitely lean more towards what the heating engineer recommends. It’s confusing when you get different advice. He just mentioned that he’s not particularly fond of the brand Stiebel but didn’t have any objections to combination units in general.
Thanks for your tips, tomorrow we will meet with the heating engineer.
Is there a real advantage between separate devices and a combination unit?
We’re already concerned about space requirements with the combination unit, since the air-source heat pump will be located in the basement. The air pump was originally planned to be outside the house.
Best regards] Are you aware that a heating engineer is ultimately a salesperson?
Get a heating load calculation plus a heat demand calculation done.
With these, you can calculate whether an air-source heat pump with controlled mechanical ventilation is really suitable for you, or if the electric backup heater will be running continuously during winter.
First, you need to know the heating capacity required at the design temperature (-x degrees Celsius depending on location). Then, based on the desired room temperatures, you calculate your heat demand.
With that, you can compare the electricity consumption of the systems.
Simple example:
Heat demand 12,000 kWh including hot water.
Air-source heat pump with a realistic seasonal performance factor of 3:
12,000 ÷ 3 = 4,000 kWh electricity consumption.
Ground-source heat pump with a realistic seasonal performance factor of 5:
12,000 ÷ 5 = 2,400 kWh electricity consumption.
That’s 1,600 kWh electricity saved, which at $0.25 per kWh results in savings of about $400 per year.
If you now build an honest KfW40 or passive house, the calculation of course looks different. The potential savings become very, very small.
By the way, currently there are very good subsidies for geothermal energy (drilling) of €4,000–5,000 (about $4,400–5,500). Please take that into account! There are also very good alternatives to geothermal drilling such as energy baskets or trench collectors. Trench collectors can be made for around €1,000 (about $1,100), or installed through one of the providers (ask in the forum)...
P.S. The heating load calculation should also include a pipe network calculation for the underfloor heating system...
Similar topics