Summary: Reader Bp&se Heat & Air Moisture
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5 The built environment and heat
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5.2 Heat transport
This is a preview. There are 2 more flashcards available for chapter 5.2
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What is the symbol for heat flux
Capital letter phi -
5.2.1 Heat transport by convection
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What is convective heat transfer?
The continuous process, in which heat is transferred from the radiator to the air getting through contract. -
What is the formula for convective heat transport?
Q_cv = h_cv(theta_s-theta_a)
Where:
q_cv = heat flor rate by convection [W/m2]
h_cv = heat transfer coefficient [W/m2K]
theta_s = surface temperature [C]
theta_a = air temperature [C] -
What is the indoor convective heat transfer coefficient for horizontal surfaces?
5 W/m2K for the floor and 0 W/m2K for the ceiling -
What is the formula for heat transport by ventilation?
Phi_v = rho*c_v*V(theta_i - theta_e) -
5.2.2 Heat transport by radiation
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Which two modes of heat transfer has the radiator?
- The air is warmed by convective heat transfer and this air on its turn warms up the partitions;
- As a result of radiation, the partitions get heated directly.
- The air is warmed by convective heat transfer and this air on its turn warms up the partitions;
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What is the formula for heat flux by radiative transfer?
Q_r = h_r(theta_s-theta_mrt)
Where:
q_r = heat flux by radiation [W]
h_r = heat transfer coefficient for radiation [W/m2K]
theta_s = surface temperature of the radiator
theta_mrt = weighted average radiation temperature -
EM radiation is a type of energy, what is its formula to determine the size?
M=epsilon*sigma*T^4
Where
M = emittance [W/m2]
epsilon = emission factor
sigma = Stefan-Bolzmann constant [5.67*10^-8 W/m2K]
T = surface temperature [K] -
5.2.3 Heat transport by conduction
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What is the definition of heat transport by conduction?
The molecules repel each other and thus exchange internal energy -
What is the formula for heat flux by conduction?
Qcd = labda(theta_2-theta_1)/d
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