ᐅ Heat Pump with Photovoltaic System vs. Gas Heating and Solar Thermal Energy
Created on: 7 Jun 2016 21:53
I
inconel
Hello everyone,
for my house construction, which will start next year, I would like to gather information about the heating system, specifically regarding the two options:
+ Gas condensing boiler, supported by approximately 12m² (130 sq ft) of solar thermal panels and a wood stove
+ Groundwater heat pump powered by a photovoltaic system
About the property:
+ Planned is a 10x11m (33x36 ft) house with two full floors, a basement, a hip roof with about 35m² (375 sq ft) of south-facing roof area, and approximately 200m² (2,150 sq ft) of living space.
+ Exterior walls made of 36.5cm (14 inches) perlite-filled bricks “Poroton T7”
+ Location: Bavaria, with an average annual solar radiation of about 1000 kWh/m²
Option 1: Gas condensing boiler
Advantages:
- Proven, durable gas condensing technology (efficient)
- Fast response time of the gas heating system, requires no long preheating
- From around April to October, the thermal energy from the solar panels is sufficient (no gas needed); in winter, supported by the wood stove for both hot water and heating
Disadvantages:
- Solar panels need to be cooled relatively early in summer, meaning little hot water is required but excess heat must be dissipated from the panels → increased electricity and water costs without added benefit
- Large domestic hot water storage tank needed to utilize countercyclical heating periods
Option 2: Photovoltaics with heat pump
Advantages:
- Autonomous heat and electricity production
- “Green energy”
- Additional support for other continuous electricity consumers (refrigerator, freezer, washing machine, dryer)
- Relatively low effort to install suction and discharge wells, as groundwater is already available at about 2.5m (8 ft) depth
Disadvantages:
- High investment costs for both photovoltaic system and heat pump (long payback period)
- Limited sunshine during months with high energy demand
- Complex and expensive, but still necessary, storage solutions for photovoltaic electricity
I hope you can understand my concerns and ideas, and I would really appreciate your feedback. How do you see the situation? What do you think is truly practical?
Thank you very much
Best regards
for my house construction, which will start next year, I would like to gather information about the heating system, specifically regarding the two options:
+ Gas condensing boiler, supported by approximately 12m² (130 sq ft) of solar thermal panels and a wood stove
+ Groundwater heat pump powered by a photovoltaic system
About the property:
+ Planned is a 10x11m (33x36 ft) house with two full floors, a basement, a hip roof with about 35m² (375 sq ft) of south-facing roof area, and approximately 200m² (2,150 sq ft) of living space.
+ Exterior walls made of 36.5cm (14 inches) perlite-filled bricks “Poroton T7”
+ Location: Bavaria, with an average annual solar radiation of about 1000 kWh/m²
Option 1: Gas condensing boiler
Advantages:
- Proven, durable gas condensing technology (efficient)
- Fast response time of the gas heating system, requires no long preheating
- From around April to October, the thermal energy from the solar panels is sufficient (no gas needed); in winter, supported by the wood stove for both hot water and heating
Disadvantages:
- Solar panels need to be cooled relatively early in summer, meaning little hot water is required but excess heat must be dissipated from the panels → increased electricity and water costs without added benefit
- Large domestic hot water storage tank needed to utilize countercyclical heating periods
Option 2: Photovoltaics with heat pump
Advantages:
- Autonomous heat and electricity production
- “Green energy”
- Additional support for other continuous electricity consumers (refrigerator, freezer, washing machine, dryer)
- Relatively low effort to install suction and discharge wells, as groundwater is already available at about 2.5m (8 ft) depth
Disadvantages:
- High investment costs for both photovoltaic system and heat pump (long payback period)
- Limited sunshine during months with high energy demand
- Complex and expensive, but still necessary, storage solutions for photovoltaic electricity
I hope you can understand my concerns and ideas, and I would really appreciate your feedback. How do you see the situation? What do you think is truly practical?
Thank you very much
Best regards
G
Goldi0911118 Jun 2016 14:27I agree here.
Our architect (who will probably handle the planning) also prefers to install brine heat pumps but without controlled mechanical ventilation, which concerns me a bit given today’s insulation standards. I find the option of installing photovoltaic systems later quite interesting since I believe energy storage will play a crucial role in the future.
But the fact is that, from an economic point of view, as things stand today, a condensing gas boiler is the best solution.
Our architect (who will probably handle the planning) also prefers to install brine heat pumps but without controlled mechanical ventilation, which concerns me a bit given today’s insulation standards. I find the option of installing photovoltaic systems later quite interesting since I believe energy storage will play a crucial role in the future.
But the fact is that, from an economic point of view, as things stand today, a condensing gas boiler is the best solution.
Goldi09111 schrieb:
But the fact is, from an economic standpoint as of today, a gas condensing boiler is the best solution.That may be true, but in many cases, their installation is not allowed, or they cannot be combined with solar thermal systems.
B
Bauexperte18 Jun 2016 19:08Goldi09111 schrieb:
But the fact is that, from an economic perspective as of today, a gas condensing boiler is the best solution.I am looking forward to the reasoning behind this statement Bauexperte
G
Goldi0911118 Jun 2016 22:49What does statement mean?!
Simply take the investment costs and the current operating costs and compare them. Of course, nobody knows these unknowns (electricity and gas costs) in the future.
Simply take the investment costs and the current operating costs and compare them. Of course, nobody knows these unknowns (electricity and gas costs) in the future.
B
Bauexperte18 Jun 2016 23:18Sorry – but then you have no idea what kind of investment you need to make to build a single-family house according to current energy saving regulations using gas.
Bauexperte
Bauexperte
G
Goldi0911119 Jun 2016 09:29Is it really that much more difficult according to the current energy-saving regulations?
I am not that knowledgeable in this field, which is why experts like you exist and are paid to always stay up to date.
I was under the impression that it is still allowed to build with gas, controlled ventilation, a certain level of insulation, and without solar thermal systems even under the new energy-saving regulations.
I am not that knowledgeable in this field, which is why experts like you exist and are paid to always stay up to date.
I was under the impression that it is still allowed to build with gas, controlled ventilation, a certain level of insulation, and without solar thermal systems even under the new energy-saving regulations.
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