Exam (elaborations)
AE 310 Module 1 Exam 1.
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AE 310 Module 1 Exam 1.
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AE 310 Module 1 Exam 1% of occupants expressing comfort goal - ANS-80%
1 Watt = ________ BTU/hr - ANS-3.413
5 Psychometric Plays
Adiabatic Cooling - ANS-(delta h) = 0
5 Psychometric Plays
Cooling and Dehumidification - ANS-q_sen = 1.1 * CMF * (T2-T1)
q_lat = 4840 * CFM * (W2-W1)
q_total = 4.5 * CFM * (h2-h1)
5 Psychometric Plays
Heating - ANS-(delta w) = 0
q_sen = 1.1 * CFM * (T2-T1)
q_lat = 0
5 Psychometric Plays
Humidification - ANS-(delta T) = 0
q_lat = 4840 * CMF * (W2-W1)
q_sen = 0
5 Psychometric Plays
Mixing - ANS-Falls between OA and RA
Outside Air Fraction (Z_p) = (CFM_OA)/(CFM_PS)
PS = Primary System Air
T_MA * CFM_PS = (T_RA * CFM_RA) + (T_OA * CFM_OA)
T_MA = T_RA * (1-Z_p) + T_OA * z_p
Assuming T_op = T_a... - ANS-No radiant or radiant panel for heating or cooling
Average U-Value for the outside window/wall (U<15.8/t_d,i - t_d,e)
Window solar heat gain coefficients (SHGC< 0.25)
There is no major heat generating equipment in the space
, CLTD Correction - ANS-1. CLTD corr = CLTD + (78 - tr) + (tm - 85)
Cooling Load Calculation Method(s) - ANS-Total Equivilent Temperature Difference
(TETD) - Average loads calculated for a number of hours
Transfer Function Method (1972) - Added weighted factors to various exterior opaque
surfaces, and weighting factors to account for thermal storage affect in converting heat
gain to cooling load
CLTD/SCL/CLF Method (1975) - Generated CLTD from data obtained using TFM
Radiant Time Series Method (RTS) - (ASHRAE Handbook of Fundamental 2009)
Cyclical Variation (< 15 Minutes) - ANS-Refers to those situations where the operative
temperature repeatedly rises and falls, and the period of those variations is not greater
than 15 minutes. Allowable peak to peak 2.0 F
Define: Thermal Comfort - ANS-The condition of the mind which expresses satisfaction
with the thermal environment
Do we design for when the occupancy is less than 15 minutes - ANS-No
Drifts and Ramps (> 15 Minutes) - ANS-Temperature drifts and ramps are monotonic,
noncyclical change in operative temperature
External Cooling Load Formula - ANS-q(dot) = U * A * CLTD
CLTD - Cooling Load Temperature Differences
U - design heat transfer coefficient [Btu/(hr* sf*°F)
Find Mixed Air Temperature - ANS-T_MA = (T_RA x %RA) + (T_OA x %OA)
Example from class:
T_MA = (75 x .62) + (88 x .38) = 80 F
Floor Surface Temperature - ANS-Occupant may feel uncomfortable due to contact with
floor surfaces that are too warm or too cool 66.2- 84.2 F
Formula for Operative Temperature - ANS-T_op = A * T_a + (1-A) * T_r
T_op = Operative Temperature
T_a = Air Temperature
T_r = Mean Radiant Temperature
Four Related Heat Flow Rates - ANS-Space heat gain
Space cooling load
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