How many heating degree-days would there be in a city when the maximum temperatu
ID: 108458 • Letter: H
Question
How many heating degree-days would there be in a city when the maximum temperature is 53 degree F and the minimum temperature is 25 degree F? How many cooling degree-days would there be in a city when the maximum temperature is 78 degree F and the minimum temperature is 56 degree F? Suppose corn is planted in eastern Nebraska on May 15^th. If this variety of corn needs 2300 growing degree-days before it can be picked, and if the mean daily temperature there for May through September is 68 degree F, in how many days would the corn be ready to pick? On what date would this be? From Table 3.2 in the textbook, determine the wind-chill under the following conditions: a) air temperature 10 degree F, wind speed 30 mph b) air temperature 40 degree F, wind speed 25 mph List the two most important factors that cause the relative humidity of air to change. Explain how relative humidity normally changes during the course of a 24-hour day. From Figure 4.5 in the textbook, determine the saturation vapour pressure for the following air temperature: 5 degree C _____Explanation / Answer
3. For calculating maximum heating degree days.
maximum temp : 53 F
minimum temp : 25 F
Assumed base temp : 65 F
then avg temperature : (53 F +25 F)/2= 88/2 = 44 F
maximum heating degree days = 65-44 = 21
4. For calculating maximum cooling degree days
maximum temp : 78 F
minimum temp : 56 F
Assumed base temp : 65 F
then avg temperature : (78 F +56 F)/2= 134/2 = 67 F
maximum heating degree days = 67-65 = 2
5. Given average mean daily temperature = 68 degree F
Assume corn base temp : 50 degree F
therefore daily : 68 - 50 = 18 growing days
therefore it requires 2300/18= 128 days
thus on 20 september it is ready to be picked.
6. a. the air temp = 10 degree F and wind speed 30 mpH produces a wind chill of (-12 degree F) (from chart)
6. b. the air temp = 40 degree F and wind speed 25 mpH produces a wind chill of (29 degree F) (from chart)
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