Based on these main components, the figure below shows the airflow graph we developed for the server. We assigned a weight to each edge of this graph, to specify the percentage of the air that flows from one component/set of components to another in the graph.

The corresponding dot language representation of the server and its associated heatflow and airflow is presented below. The values for the "weight" fields in this file resulted from our calibration experiments, which were done using micro-benchmarks (cpu_simple and disk) provided in the Mercury distribution. After calibration, we used the same .dot file to emulate the temperature of the server components while the server executed a more complex micro-benchmark (complex) that is also part of the distribution.

graph m1 {
  graph [quantity=1,fanspeed=64.9,Tinlet=21]
  diskplatter [T0=35,label="Disk",mass=.336,kconstant=896,Q="disk:(0,7.05)(1000,9.57)"];
  disk [T0=34,label="Disk",mass=.505,kconstant=896];
  cpu [T0=34,label="CPU",mass=0.25,kconstant=896,Q="cpu:(0,28.3)(100,103)"];
  power [T0=40,label="Supply",mass=1.842,kconstant=896,Q="supply:(0,105)(100,105)"];
  motherboard [T0=25,label="MoBo",mass=0.718,kconstant=1245,Q="mobo:(0,73)(100,73)"];

  cpudownstreamair [T0=27, kconstant=1004]
  cpuair [T0=33, kconstant=1004]
  diskair [T0=33, kconstant=1004]
  powerair [T0=35, kconstant=1004]
  macair [T0=25, kconstant=1004]

  diskplatter -- disk [weight=3.9]
  disk -- diskair [weight=0.51]
  power -- powerair [weight=4]
  cpu -- cpuair [weight=3.6]
  motherboard -- macair [weight=2.2]
  motherboard -- cpu [weight=2.0]
}

digraph a1 {
graph [quantity=1,fanspeed=64.9,Tinlet=21]
  inlet [T0=21, kconstant=1004]
  exhaust [T0=28, kconstant=1004]
  inlet -> cpuair [weight=0.2]
  inlet -> diskair [weight=0.2]
  inlet -> powerair [weight=0.2]
  inlet -> macair [weight=0.4]
  diskair -> macair [weight=1]
  cpuair -> cpudownstreamair [weight=0.7]
  cpuair -> macair [weight=0.3]
  cpudownstreamair -> macair [weight=0.2]
  cpudownstreamair -> exhaust [weight=0.8]
  powerair -> macair [weight=0.2]
  powerair -> exhaust [weight=0.8]
  macair -> exhaust [weight=1]
}