ᐅ Combined Heat and Power System with Fuel Cell – THE Alternative?
Created on: 22 Oct 2016 12:34
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MirkoWedel
Hello,
I am planning to build a house (living area 80m² (860 sq ft), bungalow) and would like to generate my own electricity.
After several discussions with architects and experts, I concluded that solar systems are not suitable for me.
In particular, durability and maintenance were major concerns.
After some research, I am interested in a combined heat and power unit.
This would allow me to produce electricity and heat myself,
weather-independent and, according to Stiftung Warentest, almost maintenance-free since it has very few moving parts.
I am considering the Viessmann Vitovalor 300-P.
Has anyone had any experience with this? Is it cost-effective in the long run?
I am planning to build a house (living area 80m² (860 sq ft), bungalow) and would like to generate my own electricity.
After several discussions with architects and experts, I concluded that solar systems are not suitable for me.
In particular, durability and maintenance were major concerns.
After some research, I am interested in a combined heat and power unit.
This would allow me to produce electricity and heat myself,
weather-independent and, according to Stiftung Warentest, almost maintenance-free since it has very few moving parts.
I am considering the Viessmann Vitovalor 300-P.
Has anyone had any experience with this? Is it cost-effective in the long run?
Have you checked the maximum electrical power of the device? It is specified as 15 kWh per day, which equals a continuous power of 625 W. The device will cover only a small part of your basic power needs, but as soon as you use any actual appliance (washing machine, hair dryer, microwave, vacuum cleaner, or whatever), you will have to buy additional electricity.
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MirkoWedel22 Oct 2016 20:18Average daily electricity consumption is about 10kWh. Annual consumption is 3500kWh.
If the system provides 15kWh per day, that would be 5kWh above my requirement, or am I missing something?
If the system provides 15kWh per day, that would be 5kWh above my requirement, or am I missing something?
MirkoWedel schrieb:
Average electricity consumption per day is about 10 kWh. Annual consumption 3500 kWh.
If the device provides 15 kWh per day, that is 5 kWh more than my demand, or am I missing something?Yes, this is what saruss mentioned 😉
The 15 kWh might be enough in total per day. The emphasis is on total. saruss calculated that this corresponds to a continuous output of 625 W. A vacuum cleaner needs double to triple that. So when you vacuum, you mainly buy electricity. It doesn’t matter what the combined heat and power unit can produce on average per day.
The calculation whether it’s worthwhile is certainly more complex.
However, you definitely won’t live completely self-sufficient with that.
Yes, I did mention the power output!
It’s not about the daily energy amount, but how much energy the appliances use per second!
If the system can provide 625 J (Joules) of energy per second, but your washing machine draws 2000 J per second, then you need to buy an additional 1375 Joules every second, or the washing machine won’t run! Many household appliances (including dishwashers, refrigerators) operate intermittently and require high power in bursts. The combined heat and power unit (CHP) can only cover the base load or small consumers like lamps, standby modes, etc., but if you really need electricity, that won’t be enough.
To compare, it’s like your water being delivered drop by drop, 200 l (liters) per day (an average calculation showed that this covers your annual water consumption on average). The problem is when you want to shower at 5 a.m. and then end up with no water.
(too late—but combined heat and power units are complicated anyway)
It’s not about the daily energy amount, but how much energy the appliances use per second!
If the system can provide 625 J (Joules) of energy per second, but your washing machine draws 2000 J per second, then you need to buy an additional 1375 Joules every second, or the washing machine won’t run! Many household appliances (including dishwashers, refrigerators) operate intermittently and require high power in bursts. The combined heat and power unit (CHP) can only cover the base load or small consumers like lamps, standby modes, etc., but if you really need electricity, that won’t be enough.
To compare, it’s like your water being delivered drop by drop, 200 l (liters) per day (an average calculation showed that this covers your annual water consumption on average). The problem is when you want to shower at 5 a.m. and then end up with no water.
(too late—but combined heat and power units are complicated anyway)
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