Application of the material in the previous weeks to improve a building design.
Observe the relative sizes of the space cooling and space heating demands and the corresponding nominal loads. What are your observations?
Yearly space heating energy demand is 854,052 kWh. Yearly space cooling energy demand is 297,505 kWh. Nominal power space heating is 421.3 kW. Nominal power cooling is 920.9 kW.
Total heating energy demand is much higher than cooling (~3x). But nominal cooling is much larger than heating (~2x). Maybe this could be caused a mild climate that requires some heating most of the year, but requires significant cooling e.g. during the summer.
What is the number of equivalent full load hours for space heating? And for space cooling? Is this in line with the data given in week 3, video 3.3?
FLH = (1/n) * sum(energy demand / nominal power)
Full load hours for space heating is 2027 hours. Full load hours for cooling is 323 hours. The numbers given in the slides were 1200 and 1000 respectively. Not super close.
What are the energy demands and nominal powers for space heating and cooling per square meter area?
Square footage is 12960 m^2. Space heating energy demand per m^2 is 65 kWh/m^2. Cooling demand is 23 kWh/m^2. Nominal heating is 32 W/m^2. Nominal cooling is 71 W/m^2.
What is the share of hot tap water in the total heating demand? Is it in line with the data presented in video 1.2 (week 1)?
Hot water energy demand is 59432 kWh. Total heating demand is 913484 kWh. So hot water is about 7% of the total demand. Lower than the 14% given in the slides.
What is the share of hot tap water in the total nominal load for heating?
Nominal power for hot tap water is 17 kW. Total nominal load for heating is 438 kW. So hot water is about 4% of the nominal heating load.
What would be the nominal load, demands, and share of hot tap water if the building was an apartment building instead of an office building? (see instructions for simulation)
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You just got a phone call from the client, telling you he would prefer a constant temperature of 22 deg C in the building all over the year, because of the dress code. What are the consequences for the annual heating and cooling demand and nominal powers?
All will increase. Heating 27%/8.6% (demand/nominal). Cooling 57%/13%.
The client announces that the building should host 900 people instead of 700. The size and floor plans will not change. For each location below answer: How will this change affect the space heating and cooling demand? Can you know before making changes if it will increase or decrease?
Affecting by both ventilation heat transfer from increase flow rate for more people, as well as internal heat gains (approx 100W / person). First could be heating or cooling effect depending on outdoor temperature, second is always a gain.
Increased ventilation will lead to increased heat gains. More cooling needed.
In heating season, losses from ventilation, gains from internal heat gains. Need calcuation to determine effect.
In midseason, can't say.
In cooling season, ventilation will lead to gains, increased people leads to gains. More cooling needed.
In heating season, need calculation.
In mid season, can't say.
In cooling season, can't say.
Implement the change of number of persons in the excel file to study what happens in the Dutch case. Analyze and justify your results.
Space heating demand increases by 3%. Space cooling demand increases by 5%.
What happens if the mechanical exhaust ventilation is replaced by a mechanical exhaust and supply system with heat recovery (efficiency 0.8; pressure losses 800 Pa).
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Simulate what would happen without opening the windows.
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