Good evening everyone,
My wife and I are looking for a concept for the future energy supply of an old farmhouse. I hope this category is the right one; if not, please move it.
General: The farmstead is in a remote location, with the nearest houses about 500 meters (550 yards) away. The farmhouse will have approximately 300 sqm (3,230 sq ft) of living space in the future (possibly more) and is connected to the public electricity grid and sewer system. Heating and hot water are currently provided by a gas instant water heater (gas supplied from a liquefied petroleum gas tank). We plan to renovate the farmhouse extensively. The walls are half-timbered construction (straw and clay) and will be rebuilt. As part of this renovation and conversion, all electric and plumbing installations will be replaced. We are now considering how to plan the future energy concept for the house.
A few facts about the conditions:
For the renovation, we are now considering how we want to provide heating and hot water in the future. Additionally, we are thinking about generating electricity with a photovoltaic system for self-consumption and feed-in.
Some ideas we have considered include:
Basically, we are open to all ideas but tend toward renewable energy sources (as long as they are reasonably economically viable).
From the experts’ point of view, what makes the most sense here?
My wife and I are looking for a concept for the future energy supply of an old farmhouse. I hope this category is the right one; if not, please move it.
General: The farmstead is in a remote location, with the nearest houses about 500 meters (550 yards) away. The farmhouse will have approximately 300 sqm (3,230 sq ft) of living space in the future (possibly more) and is connected to the public electricity grid and sewer system. Heating and hot water are currently provided by a gas instant water heater (gas supplied from a liquefied petroleum gas tank). We plan to renovate the farmhouse extensively. The walls are half-timbered construction (straw and clay) and will be rebuilt. As part of this renovation and conversion, all electric and plumbing installations will be replaced. We are now considering how to plan the future energy concept for the house.
A few facts about the conditions:
- Next to the farmhouse is a barn facing south-southeast (about 25-30 m (80-100 ft) away). The roof has an available area of approximately 80 sqm (860 sq ft). The roof was replaced about 10 years ago.
- The farmhouse roof is about 25 years old. Currently, there are no plans to replace this roof. The question here is how sensible it is to install a photovoltaic system or solar thermal system if the roof will need to be renewed in about 20 years. There is space for about 60-70 sqm (650-750 sq ft). The orientation is southwest.
- There is plenty of space around the farmhouse. For energy systems that require a lot of space, there is enough room—though a wind turbine is not an option.
- One side of the farmhouse borders a forest. This forest belongs to the farm and could provide wood “free of charge.”
For the renovation, we are now considering how we want to provide heating and hot water in the future. Additionally, we are thinking about generating electricity with a photovoltaic system for self-consumption and feed-in.
Some ideas we have considered include:
- Building a large enough masonry stove to heat large areas of the house.
- Solar thermal system for hot water generation (only makes sense on the main house—or can hot water be channeled underground to the main house?).
- Photovoltaic system for electricity (possibly with storage?)—this could be significantly oversized for grid feed-in.
Basically, we are open to all ideas but tend toward renewable energy sources (as long as they are reasonably economically viable).
From the experts’ point of view, what makes the most sense here?
hampshire schrieb:
Heat pumps combined with underfloor heating are efficient heating systems. Since you have plenty of space and probably no rocky soil, I recommend looking into the ice storage heating system. It really makes sense only with a higher energy demand – which you certainly have due to the large and older buildings. The principle is simple and extremely environmentally friendly: Energy is stored in a concrete tank buried underground, filled with water, and extracted there by a heat pump through refrigerant pipes. The clever part is using the crystallization energy released when water freezes. The surrounding soil supplies the water tank with heat by maintaining a stable temperature, "warming" the water again against the energy extracted.
Why?
In my view, this system offers the benefits of constant geothermal heat without affecting the temperature conditions important for microorganisms deep in the soil that are vital for good soil and water quality. At the same time, the heat pump can be set very efficiently (due to constant conditions) and does not suffer the winter efficiency loss common with systems that extract energy from ambient air.
Downside: There are still relatively few installed systems on the market, and many installers and consultants have a “I don’t know it – I won’t build it” mentality.
What do you mean by higher energy demand? So it’s rather not suitable for a modern single-family home? I haven’t really read much about it in that context so far.
Gas + photovoltaic + air conditioning, which also functions as a heat pump. Additionally, there is a controlled mechanical ventilation system with heat recovery. We require a high peak output due to the pool. Otherwise, we would have chosen a hybrid system with gas and a fuel cell.
H
hampshire6 Feb 2020 14:47annab377 schrieb:
What do you mean by higher energy demand? So, it’s probably not suitable for a modern detached house? Because I haven’t really seen anything like that for such a case so far. For a single modern house, the systems are far too large. However, for an old farmhouse, it might be worth calculating. Here in Lindlar, there are several installations, including a reference system in an event building with a climbing gym and catering, which used to be an industrial building.
rick2018 schrieb:
Gas + photovoltaic system + air conditioning, which also functions as a heat pump. Additionally, controlled residential ventilation with heat recovery. We need a high peak output due to the pool. Otherwise, we would have chosen a hybrid system with gas + fuel cell.What is the effort required to heat the pool?
How large is the heat generator?
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