A farmer in upstate New York (Albany, NY), wants to grow Buttercrunch Lettuce in

Question

A farmer in upstate New York (Albany, NY), wants to grow Buttercrunch Lettuce in the winter months in a greenhouse with artificial lighting.

Given:

Insulation (R-vaule): 3.0 oF-ft2-btu/hr

Lamps: 15 Metal Halide lamps (Surface Temperature: 417oF, Surface area:0.167, Emissivity: 0.85 )

Ventilation rate: 1 change per hour (Greenhouse Volume:1680 ft2)

Average Outside Winter High: 48 oF

Average Outside Winter Low: 24 oF

Average Outside RH%: 70%

Greenhouse: Surface Area = 806 ft2

Indoor Temperature range: 60 to 65 oF

Indoor RH: 50-70 %

Calculate the maximum amount of water added/removed from the ventilation air as it enters the greenhouse in order to maintain the inside Humidity?

Select one:

a. 0.003 lbs H20/lb Air

b. 15.00 lbs H2O/lb air

c. 0.000 lbs H2O/lb air

d. 0.00099 lbs H2O/lb air

e. 0.010 lbs H20/lbs air

f. 0.0055 lbs H2O/lb air

Explanation / Answer

According to the question we have given the following data as follows-

insulation=3.0 of ft 2 btu/hr

lamp=15

ventilation= 1 Change per hours

average outside winter high= 48

average outside winter low=24

average outside RH % = 70%

green house surface area= 806 ft2

indoor temperature range= 60-65 oF

indoor RH= 50-70 %

Now we need to calculate maximum amount of water added or removed from the ventilation of air is-

=(60x24x70x1)/(806x3.0)

=0.010lbs H2O/lbs air.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.