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hallowach200227 Apr 2015 17:00Hello,
is there any free simulation software available that reliably incorporates all relevant parameters to calculate the annual yield for hot water? I would also be interested in how the calculation method according to the legal requirements is done to achieve 15% renewable energy. Or is it simply 4% of the living area as collector area, regardless of installation location, roof pitch, and orientation?
is there any free simulation software available that reliably incorporates all relevant parameters to calculate the annual yield for hot water? I would also be interested in how the calculation method according to the legal requirements is done to achieve 15% renewable energy. Or is it simply 4% of the living area as collector area, regardless of installation location, roof pitch, and orientation?
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Bauexperte27 Apr 2015 18:17hallowach2002 schrieb:
Is there any freely available simulation software that reliably incorporates all relevant parameters to calculate the annual yield for domestic hot water? Sometimes there are questions—and yours is one of them—that I simply don’t take seriously or fully understand... How is it possible for any program, even if well designed, to know your actual water consumption? I’m sure you don’t know it yourself, since not every day has the same activities and temperatures, and the need for a shower can’t be realistically captured by software.
The following question can be answered by simply looking into the energy saving regulations 😉
Best regards, Bauexperte
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hallowach200227 Apr 2015 18:27I did not ask about the actual yield, but for a tool that calculates the yield depending on the relevant parameters, which are based on assumptions.
OK, I admit: I was too lazy to read the energy saving ordinance...
OK, I admit: I was too lazy to read the energy saving ordinance...
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hallowach200227 Apr 2015 19:22If not formulated precisely enough: I want to be able to select the input parameters according to my assumptions.
Good software costs money and is recognized by the BAFA.
If you want a fairly precise assessment of your requirements, I can recommend Buschbeck solar technology, as their quotes take your personal data and the size of the system recommendation into account. What you decide to do afterward needs to be worked out.
Many programs used by energy consultants are too general and do not accurately represent the performance capabilities of a solar system for solar heating. I would not buy a solar system just for hot water. These systems typically have guaranteed scaling, unless you limit the temperature in the storage tank from top to bottom below the scaling threshold, which particularly increases above 60°C (140°F). Buschbeck offers solutions for this that can certainly be viewed at existing installations. You are from Hesse— which district are you from? You probably do not want to disclose your town, but that is not necessary. If you want to get in touch, just write to me, and we can arrange a phone call.
If you want a fairly precise assessment of your requirements, I can recommend Buschbeck solar technology, as their quotes take your personal data and the size of the system recommendation into account. What you decide to do afterward needs to be worked out.
Many programs used by energy consultants are too general and do not accurately represent the performance capabilities of a solar system for solar heating. I would not buy a solar system just for hot water. These systems typically have guaranteed scaling, unless you limit the temperature in the storage tank from top to bottom below the scaling threshold, which particularly increases above 60°C (140°F). Buschbeck offers solutions for this that can certainly be viewed at existing installations. You are from Hesse— which district are you from? You probably do not want to disclose your town, but that is not necessary. If you want to get in touch, just write to me, and we can arrange a phone call.
This is an industry that many people make a living from ;-)
Sometimes you might get lucky at universities, but I doubt it in this case.
For us, the demand for hot water is 3068 kWh compared to 8374 kWh for heating energy – so 27% or 12.5 kWh per square meter.
In general: the better insulated your house is, the higher the proportion of hot water demand will be.
Another approach:
Per person, 50 liters (13 gallons) of water need to be heated daily – so 4 people require 200 liters (53 gallons) of water. The average water temperature is assumed to be 10°C (50°F) and it is heated to 45°C (113°F), resulting in a temperature difference of 35 K.
As is well known, heating 1 kilogram of water by 1 degree requires 1 kcal or 4.18 kJ (Ws) of energy. Accordingly, the calculation is: 35 K * 1 kcal/kg * 200 kg = 7000 kcal = 29260 kJ = 29260 kWs = 8.12 kWh * 365 = 2966 kWh.
With an 80% heating system efficiency, this results in about 3700 kWh or 930 kWh per person per year.
Now you can consider whether you shower more or less, etc.
Sometimes you might get lucky at universities, but I doubt it in this case.
For us, the demand for hot water is 3068 kWh compared to 8374 kWh for heating energy – so 27% or 12.5 kWh per square meter.
In general: the better insulated your house is, the higher the proportion of hot water demand will be.
Another approach:
Per person, 50 liters (13 gallons) of water need to be heated daily – so 4 people require 200 liters (53 gallons) of water. The average water temperature is assumed to be 10°C (50°F) and it is heated to 45°C (113°F), resulting in a temperature difference of 35 K.
As is well known, heating 1 kilogram of water by 1 degree requires 1 kcal or 4.18 kJ (Ws) of energy. Accordingly, the calculation is: 35 K * 1 kcal/kg * 200 kg = 7000 kcal = 29260 kJ = 29260 kWs = 8.12 kWh * 365 = 2966 kWh.
With an 80% heating system efficiency, this results in about 3700 kWh or 930 kWh per person per year.
Now you can consider whether you shower more or less, etc.
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