Download User Guide for Thermo-RESI - Georg-August

User Guide for Thermo-RESI
-6–
9. Convective heat C, Long-wave radiation Lrn, Short-wave radiation Rn and Energy
balance at coat surface Qc2
The sum of C, Lrn and Rn results in the value of Qc2 (a minus-sign of these values shows heat
flows leaving the body of the animal).
10. Heat flux through coat Qc
Qc is the heat balance between the skin and the coat surface. It is dependent of the skin
temperature Ts and the coat temperature Tc. For the right heat balance of the animal Qc has
to be equal to Qc2 (within a narrow margin).
11. Body temperature Tb and Increase of body temperature dTb
The standard value for Tb is 39°C. dTb shows the increase of Tb within 1 hour of time.
CASE 1
Air temperature (°C)
Date (Julian day)
Time (dez. minutes)
Metab. heat prod. (W/m2)
Weight (kg)
Orientation to South (deg.)
Wind speed (m/s)
Cloud cover (okta)
Direct shading (dez. fract.)
Coat thickness (m)
Max. sweat rate (g/m2*h)
Water supply (%)
Spec. heat (kJ/kg*K)
Geog. Latitude (deg.)
Albedo of surround. (dez. fr.)
Emiss. of surface (dez. fract.)
Shortwave refl. (dez. fract.)
Relative humidity (%)
38
75
12
155
350
0
0.1
0
0
0.01
900
100
3.4
13
0.25
0.98
0.12
10
CASE 2
37
120
12.5
166
600
0
0.1
0
0
0.01
400
100
3.4
13
0.25
0.98
0.2
10
CASE 3
CASE 4
37
100
12
166
600
0
0.5
0
0
0.01
220
100
3.4
13
0.25
0.98
0.25
35
40
75
13.1
166
600
0
0.1
0
0
0.01
220
100
3.4
13
0.25
0.98
0.12
20
Tab. 1: For each of the 4 cases explained in the text this table shows an example input data set.
The model distinguishes between 4 different cases of interaction between the animal and
the climatic conditions. At the end of the output according to these cases 4 different types of
comment will appear:
CASE 1:
The animal is well adapted to the climatic conditions and feels comfortable.
CASE 2:
The animal suffers from slight heat stress. The respiration is shallow and fast. Additional
cooling like direct shadow could be necessary if the situation does not change.
CASE 3:
The animal suffers from strong heat stress. The respiration is deep and fast. Additional
cooling like direct shadow should be provided soon.