Author Question: What are the various advantages associated with air inflation of a double layer of polyethylene as ... (Read 40 times)

tichca · **on:** Jul 22, 2018

What are the various advantages associated with air inflation of a double layer of polyethylene as opposed to earlier methods of applying two layers of polyethylene?

What will be an ideal response?

Question 2

The most common type of film plastic used in the United States is _______________ The thickness of this plastic for the outer layer should be _____________ and for the inner layer it only needs to have a thickness of ___________. This plastic is mainly destroyed over time by _______ . Its life expectancy can be up to _______ years.

Fill in the blank(s) with correct word

sierramartinez · **Reply #1 on:** Jul 22, 2018

Answer to Question 1

Both layers can be applied from the outside of the greenhouse which
makes the process easier and quicker. The outer layer rests on a cushion of air
which results in a longer life expectancy, commonly three to four years. Often the
dead air space is a more uniform and desirable thickness leading to greater savings
in fuel. During a snowstorm the pressurizing fan can be turned off to allow the
layers of film plastic to touch and thereby loose heat faster for melting snow.

Answer to Question 2

polyethylene, 6 mils, 4 mils, UV light, and 4 years.