Design day:
Dry bulbs temperature& wet bulb temperature peak simultaneously. Maximum dry bulb temperature-summer.
(i) Sun load:
Sun rays entering the windows through glass, solar heat gain sun rays striking the walls & the roof & subsequent heat flow inside due to equivalent temperature. Heat flow through structure.
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(ii) Transmission load:
Heat transmission through glass & walls due to temperature difference between outside & inside.
Migration of water vapour due to air vapour pressure differential. Infiltration through doors & windows due to wind.
(iii) Outside air load:
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Outside air is needed for ventilation.
(iv) People:
Heat load-due to human occupancy
Sensible heat loss
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Latent heat loss
(v) Lights:
Electrical calculating m/c.
Electric motors
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Hot pipes & tanks.
Fresh Air Load:
Fresh air load is 50% of the total guest floor load.
Saving of energy:
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The guest room fresh air load is so large that substantial savings could be achieved by providing heat recovery wheel. The savings in the total energy will be as much as 25-30% of the total guest floor load.
Next in importance is the 24-hour areas like the coffee shop, lobbies etc. where energy is wasted by:
i. Constantly pumping the same quantity of fresh air throughout the day and night by constantly in circulating the same total air quantity.
ii. Fresh air quantity could be curtailed through an IAQ sensor or more simply by introducing a packaged energy wheel.
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iii. In the case of restaurants, working for a few hours in a day, packaged energy wheel provides constant quantity of fresh air promoting good indoor air quality. However, the peak period elongates depending on the number of hours of operation in a day.
Same is the case with Banquet Halls and Ball rooms. Here, a simple plate heat exchanger on the supply air provides medium of reheat (without any expenditure of energy) which is badly needed in a space with high latent heat.