The following data are for a restaurant: „X Dimensions: 28 m Length, 16 m Width,
ID: 1717374 • Letter: T
Question
The following data are for a restaurant: „X Dimensions: 28 m Length, 16 m Width, and 4m height. „X The summer outside design conditions: 40oC dbt & 24oC wbt „X Inside design conditions: 22oC & 50% R.H. „X Temperature of adjacent non-conditioning walls: 35oC „X Max. Number of persons: 200 „X Heat liberated form each person: 80 Watt sensible & 80 Watt latent „X Fresh air required for each person: 8 L/s „X Light intensity: 30 Watt per square meter floor area. „X The overall heat transfer coefficient (U) for walls, and ceiling: 1. 5 W/m2.oC, and for glass windows: 3.18 W/m2.oC „X Solar temperature difference due to sun effect (ƒ´ts)= 10oC for south wall & 12oC for roof. „X Solar intensity for south orientation glass windows: 350W /m2 „X Estimated equipment load: 5000 Watt „X Heat from food per meal: 10Watt sensible, and 10Watt latent Calculate the cooling capacity of air-handling unit (AHU) uses chilled water-cooling coil and supply fan serves the restaurant. Also calculate the room sensible heat ratio (RSHR) , Grand sensible heat ratio (GSHR), amount of supply air, and percentage of fresh air.
Explanation / Answer
out side design condition DBT = 40 oC
WBT = 24 oC
INSIDE CONDITION 22oc - 50%RH
heat gained through walls = 1.5 x 28 x 4x 283
= 47544 w
heat gained through ceiling = 1.5 x28 x 16 x 288
= 193536 w
heat gianed through glass windows =3.18 x 2 x 1.5 x 288
= 2747 .52 w
total sensible heat gaind through walls , roof , windows = 193536 + 2747.52 +47544
= 243827.52w
Infilterd air cmm = 28 x 16 /60 = 7.46 m^3 /min
sensible heat gain = 0.0204 x cmm x (40 -24 )
= 0.0204 x 7.46 x 16
= 2.43 w
occupancy sensible heat = 200 x 80
= 16000w
latent heat = 200 x 80
= 16000w
from food meal sensible heat = 10 w
latent heat for meal = 10 w
out side air sensible heat gain = 0.0204 x 7.46 (40-22 )
= 2740 w
total sensible heat = 262579.95w
total latent heat = 16010
grand sensible heat ratio = 262.5 / 262..25 +16.0
=0.94
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.