DOC PREVIEW
ISU AGRON 515 - Problem Set 12

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Agronomy 405/505Spring 2011Problem Set 12Due Tuesday, April 19, 2011.Assigned April 12, 2011. Updated April 13, 2011.1. 12.2 in Campbell and Norman. Recall the conditions f or calculating the lower andupper lethal limits in the class notes. Use Figure 12.5 to estimate the whole bodyconductance of a sparrow. We should probably use Figure 12.3 to calculate respiratorylatent heat loss, but instead assume that the minimum to t al latent heat loss is 10%of the metabolic rate. Also recall that when conductances are in series, the totalconductance is essentially controlled by the lowest conductance in the series. Are yousurprised by your answers? Why or why not? If surprised, what assumption did wemake that may be causing the surprising answer?2. 12.4 in Campbell and Norman. The sunbather is on a beach on Lake Michigan atthe same latitude as Ames (42.0 N) and the solar time is noo n on July 1 so that Sunzenith angle, θ, is 19◦. Calculate the view factor for the sunbather using the cylinder(hemispher e ends) model in Figure 11.6 with h = 1.8 m and d = 0.25 m. Assumethe a lbedo of the sand is high enough that its temperature is the same as the airtemperature. How would the operative temperature of t he sunbather change if thetemperature of the sand was significantly higher than air temperature (which wouldlikely be the case)?3. 13.2 in Campbell and Norman. Use Ames coordinates: 4 2.0 N, 93.6 W. Make the fol-lowing assumptions: solar noon at t he middle of December (θ = 65◦); Fp= 0.12;standard pressure; αs= 0.7; ρground= 0.15; τ = 0.3; d = 0.17 m; αL= 0.95;ǫground= 0.9; Tground= 0◦C; and c = 0.1. For the second half o f the question(what clothing conductance would be needed), a ssume M = 2 50 W m−2, a suitablemetabolic rat e for a brisk walk. Throughout the problem make the assumption thatg = (gHrgHb) / (gHr+ gHb) ≈ gHc, where gHcis clothing conductance. This is a rea-sonable assumption since gHcis likely the smallest and therefor limiting conductance.4. Read “Body Heat: Sweden’s New Green Energy” at http://snipr.com/vj2hl.(a) What complex in the United States also uses human body heat to reduce energycosts?1(b) What happ ened to the body heat generated at the train station before it was usedto help heat a nearby building?(c) What are some of the limitations to this kind of energy system?(d) Why might this kind of system not “catch on” in the United States as quickly asin other countries?5. Read “Differences in Thermal Tolerance Among Sockeye Salmon Population,” doi:10.1126/science.1199158.(a) The authors predicted that “migration distance... would exert the strongest se-lection pressure on aerobic scope.” Was this confirmed? See Figure 2.(b) What is the name of the most challenging section of the Fraser River system?(c) Define the variable Tpthat is mentioned on page 112.(d) Speculate what might happen if the water temperature at the river feature namedin Part 5b increases in the future.(e) Which population of sockeye salmon a ppears to have the greatest tolerance forclimate


View Full Document

ISU AGRON 515 - Problem Set 12

Download Problem Set 12
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Problem Set 12 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Problem Set 12 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?