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Hi, I'm trying to simulate a stratified water heater for São Paulo-Brazil .epw and find out the consumption of the heater (kWh) for each month. I'm using a heater of 6000W capacity, with a patter of bath 40minutes per day (4l/min). I got the consumption from the Table Report and it is too high (The usual is maximum of 90kWh for a month). I converted J to kWh and got this:

WATER HEATER TOTAL DEMAND HEAT TRANSFER ENERGY [J](kWh) WATER HEATER HEAT LOSS ENERGY [J]   (kWh)
January          482239000.00                                     133.96    -79534413.60                                           -22.09
February             443646000.00                                     123.24    -73541655.60                                           -20.43
March            538367000.00                                     149.55    -85841829.00                                           -23.84
April                    550458000.00                                     152.91    -94792808.10                                           -26.33
May                  600509000.00                                     166.81    -105807662.30                                          -29.39
June                     580653000.00                                     161.29    -102193879.20                                          -28.39
July                     612884000.00                                     170.25    -108955406.70                                          -30.27
August           591676000.00                                       164.35  -103599575.70                                          -28.78
September    556954000.00                                     154.71    -96280359.00                                           -26.74
October          578996000.00                                     160.83    -99992914.30                                           -27.78
November             543994000.00                                     151.11    -93088050.10                                           -25.86
December             540370000.00                                     150.10    -89565130.60                                           -24.88

The temperature of the tank outlet looks fine. I dont know if I'm using the wrong output object to obtain the consumption results or if there is a mistake in my .idf. I'm senting a link if somebody want to give me a little help here.

https://www.dropbox.com/sh/or7f0yk7p6... Thanks!

Thanks a lot, Richard!

Well, i make sense. Water temperature here is abou 20°C at summer and 15°C at winter

I got the losses close to zero. But the sum of the demand of electricity for the element heater is still high: January 1

You're right, I will set the losses to zero.

once the results are given per hour in Joules (J) i changed it for kWh

For January is 130898Wh, I supposed

Once the hot water pattern is constant (between 18:00 and 18:40 p.m.) 0,16m³ per day

WATER HEATER HEAT LOSS ENERGY [W] January -19.04 February -17.60 March -20.55 April -22.69 M

WATER HEATER TOTAL DEMAND HEAT TRANSFER ENERGY [W] January 130898.61 February 120408.61 March 146

Hi! I tried that but it didn't change much. The demand is still too high for month (january that is summer, for exemplo,

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