Question

An office is located at the top floor of an air conditioned building with a floor to ceiling height of 3.8 m and a total floor area of 441 m2 (21 m by 21 m). The office building is located in Amman, Jordan (Tdb = 37C, Twb = 25.5C; Patm = 101.325 kPa). The building has a uniformly distributed glazed façade equal to 21% of the total wall area with infiltration rate of 0.75 ACH. The designed U-values are for walls (0.57 W/m2 .K), windows (1.8 W/m2 .K) and for roof (0.8 W/m2 .K). The highly reflective surface absorptivity value of 0.53 and the outside surface resistance value of 0.04 m2. K/W are given based on the Jordanian Building codes requirements and calculations. Take the following values for SHGC (0.24). light load (21 w/m2), equipment load (30 W/m2). For Amman, the solar radiation values are for North (155 W/m2). South (560 W/m2). East (645 W/m2), West (645 W/m2) and for roof (1025 W/m2). The indoor design conditions are (Tdb = 24C: Twb = 17C Supply air temperature = 17C). Based on Block Load Calculations, Estimate the maximum possible A) Sensible heat due to infiltration? (W) B) Latent heat due to infiltration? (W) C) Sensible heat due to Ventilation? (W) D) Latent heat due to Ventilation? (W) E) Total heat transferred through the walls? (W) F) Total heat transferred through the windows? (W) G) Total heat transferred through the roof? (W) H) Total heat gain from people (seated), lights and equipment? (W) I) Sensible cooling load for the space? (W) J) Latent cooling load for the space? (W) K) Total cooling load of the system. (neglect losses /gains through ducts and/or fans? (W) L) Total supply air flow rate to the space? (L/S)

          An office is located at the top floor of an air conditioned building with a floor to ceiling height of 3.8 m and a total floor area of 441 m2 (21 m by 21 m). The office building is located in Amman, Jordan (Tdb = 37C, Twb = 25.5C; Patm = 101.325 kPa). The building has a uniformly distributed glazed façade equal to 21% of the total wall area with infiltration rate of 0.75 ACH. The designed U-values are for walls (0.57 W/m2 .K), windows (1.8 W/m2 .K) and for roof (0.8 W/m2 .K). The highly reflective surface absorptivity value of 0.53 and the outside surface resistance value of 0.04 m2. K/W are given based on the Jordanian Building codes requirements and calculations. Take the following values for SHGC (0.24). light load      (21 w/m2), equipment load (30 W/m2). For Amman, the solar radiation values are for North (155 W/m2). South (560 W/m2). East (645 W/m2), West (645 W/m2) and for roof (1025 W/m2). The indoor design conditions are (Tdb = 24C: Twb = 17C Supply air temperature = 17C). 
Based on Block Load Calculations, Estimate the maximum possible 
A) Sensible heat due to infiltration? (W)
B) Latent heat due to infiltration? (W)
C) Sensible heat due to Ventilation? (W)
D) Latent heat due to Ventilation? (W)
E) Total heat transferred through the walls? (W)
F) Total heat transferred through the windows? (W)
G) Total heat transferred through the roof? (W)
H) Total heat gain from people (seated), lights and equipment? (W)
I) Sensible cooling load for the space? (W)
J) Latent cooling load for the space? (W)
K) Total cooling load of the system. (neglect losses /gains through ducts and/or fans? (W)
L) Total supply air flow rate to the space? (L/S)

Added by Rebecca H.

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