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ID number:622596
 
Author:
Evaluation:
Published: 19.03.2021.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Time period viewed: 2016 - 2020 years
Extract

Aprēķins;
Vidējā ūdens temperatūra siltummainī.
tū = 0.5(t’2+t’’2)= 0.5*(65+140)=102.5 0C
Īpatnējā siltumietilpība ūdenim c_ū=1030 (J/((kg∙K) ))
Knemātiskā viskozitāte ūdenim: v = 0.295 *10-6 m2/s
Siltumvadītspējas koeficients ūdenim λū = 0,69 W(m*0C)
Blīvums ūdenim ρ 960 kg/m3
Prandla koeficients ūdenim 1,8
Vidējā gaisa temperatūra, kas iziet caur siltummaini.
tga = 0.5(t’1+t’’1)= 0.5*(270+200)=235 0C
Īpatnējā siltumietilpība gaisam c_g=4225 (J/((kg∙K) ))
Knemātiskā viskozitāte gaisam : v = 38 *10-6 m2/s
Siltumvadītspējas koeficients gaisam λg = 4.1*102 W(m*0C)

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