Cost of Gas Heating for 120m2: Boiler Adjustment, Energy Demand & Impact of Temperature in Poland

"Maybe you need to adjust the boiler / installation 6m3 * 30 days = 180m3 * 2 PLN = 360 PLN per month is not real"

It made me so tired that I sat down to it today. The final energy demand of the building is 100.74 KWh / m2 per year. If we obtain about 9.9 KWh from the combustion of 1 m3 of gas, then with such a demand of the building for final energy, 1251.92437 m3 of gas per year, calculated for 20 ^ C ext. of the building for typical annual temperatures in Poland. Assuming that each increase by 1 ^ C of the temperature inside the building is 5% higher gas consumption, at the indoor temperature 22.5 / 22 ^ C we have about 7.87 m3 of the daily average and 1420 m3 per year. Of course, this would be the case if, from the combustion of 1 m3 of gas, the entire 9.9 KWh could be used without losses to heat the house, if the internal temperature was actually increased. building by 1 ^ C increased gas consumption by 5% and all these energy performance certificates translated into the actual condition of the building at its disposal.

Even without counting in every journal devoted to heating technology, the estimated cost of heating an area of 120-140 m2 is PLN 2700-3000. Dividing 3,000 by 6 months, it gives 500 PLN of the monthly average, assuming that we have a new building according to the requirements of WT2008, the latest invention in our boiler room and radiators or underfloor heating adapted to this invention.

I am asking for severe criticism

let's start here
http://www.andretti.pl/wxdegreedetail.php
theoretical calculations of course :)




what do you think ?

Gosh ... I don't know what patterns your spreadsheet uses. Why can't I get it? The final energy demand for my house was calculated at 100.74 kWh / m2 per year. At 123.9 m2, the area to be heated comes out (100.74 * 123.9) = 12481.686 kWh / year. In the period May-October, I paid PLN 250 every 2 months for hot water. (PLN 750-PLN 371) / 1.6 = 236 m3 of gas and this is 246 m3 * 9.9 kWh / m3 = 2336.4 kWh for 6 months for heating the water only (371 - fixed network fee + subscription, and 1.6 is the price of m3 gas + variable network fee; 9.9kWh is obtained by burning 1m3 of gas). From 12,481,686 kWh - 2,336.4 kWh = 10,145.2 kWh for water and CO heating only in winter. 10,145.2 / 9.9 = 1024.76768 m3 of gas for winter, which is on average 1024.76768 / 180 = 5.6 m3 per day. It is not real for me. Because every day you need to heat 400l of water with 4 people, and maybe even more (calculations from the time of showering household members and water flow per minute). But looking at the summer period, I know how much more it costs to heat the water - on average 1.3 m3 of gas, and in winter even 2 m3. So on the warmest days of November, 13-14 ° C, with early frosts, he took 4.5 m3 of gas, of which 2 m3 for water ... 2.5 m3 is left for heating CO.

are you slowly saying that you use 400l of water at 55st a day?

40 ^ C. I do not produce 55 ° C mixing with the cold afterwards. This is nonsense.

http://pliki.bimsplus.com.pl/Broetje/pp.pdf

page 159 - some formulas and theories

kasku97 wrote:

40 ^ C. I do not produce 55 ° C mixing with the cold afterwards. This is nonsense.

Maybe just economic nonsense. By heating the water to only 40 degrees, you create the perfect conditions for legionella.

I was on the bimsplus website and counted. It turned out a bit less, but I admit that these calculations are rough, i.e. simplified. Anyway, Bimsplus himself recommends the method based on degree days as the second, i.e. the simplified one. Energy performance certificates are based on an architectural design. And whether the contractor did it as it is in the architectural design is a different story. So they are estimates as well as degree day calculations. How can I be sure that the efficiency of the heating system is 0.95, and the boiler is always 1.1, and the degrees in a given year will be the same. Beloved, the truth is ... the developer says that there is to be class A of the building - he pays and there is class A And you, man, count and make your own.

Added after 2 [minutes]:

Thanks, I forgot that the heating period is 8-9 months .

House 120 m2. I have lived in it for 4 years. Gas heating - water and radiators. In the summer - collectors. Stove - solar-gas condensing Vaillant VSC S 196-C.
So far, gas bills have been fairly OK, although for the last 2010/2011 season we paid 4500 (all year round), much more than before. We have gas from the Flag Gaz Polska (formerly Progaz). We got an invoice for one month (November) showing consumption 178 m3 , converted to liters: 694.20 (conversion L = 3.9), which gave a total of over PLN 2400 gross . It is not difficult to calculate that the average daily consumption in November was 5.9 m3 / day , which is fairly normal with the temperature set at 20-21 degrees. The radiators are set to the minimum, the house is warm. In the evenings and on weekends, we heat up with a fireplace - the temperature at the bottom rises to 22 degrees. Note: we do not heat tap water on a regular basis, we use a temporary party (one-time charging, unless someone forgets and turns on a permanent party, which sometimes happens). Can you comment the amount of the bill: 2400 for one month? I already checked that the consumption in December was similar, so should I expect another bill of around 2500? Two years ago, we paid this amount for almost a whole year! What are you paying bills with proper consumption?

House of 120m2 and such a bill?! It is possible that this is some stove failure, maybe the counter has broken? What does warming look like? maybe it is worth increasing the layer on the walls and roof?

Walker29. Thanks for the calculations. I will look at the house plan, but I do not have it at hand now.

A liter of gas in Flag Gaz costs us about PLN 3.5 gross. The house is decently insulated. At least it seemed so. Two days ago there were oven service technicians because there was a water leak from the external tank. The tank was replaced, by the way, they changed the water heating settings to higher values - up to 50-55 degrees, because they were set lower. They said that thanks to this, the stove will not turn on when hot water is consumed, just a little later, which will save you money.
The amount of the bill amazes me. I came to forums, and most of them write about consumption greater than 6 m3 / day, even much more. But they pay much smaller bills: several hundred zlotys. I wonder if the problem lies only in the volume of gas burned, or is there something wrong with the billing?

Maybe change supplier if possible.

Hello.

Walker29 wrote:

Propane

6 m3 / day = about 24 liters
assuming that 1l = 0.52kg
a 1 kg / h = 13 kW
you burn 12 kg per day, which gives us the equivalent of 12x13 = 156kW of energy / day

156x30 = 4680kW of energy in November

There are no "kW of energy". The unit of energy is the joule, or watt-second: 1J = 1Ws. Since it is a very small unit, the larger ones are used in practice, for example: 1MJ, 1GJ, and also 1kWh = 3,600,000 J. However, 1kW is a power unit. A kilowatt hour is a very "pictorial" and convenient unit, because it tells us how much heat (energy) a 1kW stove (heater) gives us in 1 hour. The calorific value can also be specified in kilowatt hours, e.g. for 1 kg of gas approx. 13 kWh.
The rest is OK.

Phew, finally the amount of the bill began to clarify. In the meantime, we contacted the supplier and it turned out that these 180 m3 did not concern November, but a period of several months (I have information from my wife by phone, so I do not know the details yet). It also turned out that we did not pay for gas in the last year, so now the supplier is catching up. Now we can clearly see that we have to deal with settlement issues differently, e.g. monthly - the bills will be smoother. But there is also another, good side to this matter: by corresponding with you on the forum, I turned the heating down even more and started regular measurements. And it turned out that after turning on the heating, we use 1.2 m3 a day. Incredible indeed. It is true that no one was bathing in a full bathtub at that time, so with time this average will probably increase, but it is still a comforting result. Thank you very much for your commitment and feedback, especially to Walker and Seba.