Steam Radiant / Convective
This zone level equipment calculates the convective and radiant heat transfer from steam baseboard heaters to the people and the surfaces within the assigned zone. Surface heat balances can thus take into account the radiant heat transfer to the surfaces in order to enhance the accuracy of thermal comfort predictions within the space.
Nominal Heating Capacity
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Default: Autosize
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Typical Range: x > 0
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Min Max: N/A
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Units: % Htg Capacity, Btuh, Btuh/ft2, kW, MBh, tons, tons/ft2, W, W/ft2, W/m2
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This field represents the maximum radiant/convective steam baseboard unit heating capacity. The program will calculate this capacity if Autosize is selected.
Radiant
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Default: 50%
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Typical Range: 0 < X < 100
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Min Max: N/A
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Units: %
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This field specifies what percentage of the total power input to the baseboard heater is transferred to the space as radiant heat. The portion that is radiant heat transfer from the baseboard heater is distributed to people and specific surfaces.
Radiant Incident on People
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Default: 50%
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Typical Range: 0 < X < 100
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Min Max: N/A
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Units: %
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This field specifies the percentage of radiant portion of heat transfer to the zone from the baseboard heater that is incident directly on people within the space. This has an impact on the predicted thermal comfort of the zone occupants. The basic assumption here is that most radiant energy falling on people will most likely be re-released to the zone air by convection. Note that the sum of the percentage of all radiant energy must equal 100% so the remainder of the energy that doesn’t get absorbed by people will impact the zone surfaces.
Degree of Subcooling
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Default: 9 Delta °F
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Typical Range: x > 1
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Min Max: N/A
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Units: Delta °F/ Delta °C
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This field is the temperature drop of the condensate in the coil of the baseboard heater. The steam condensates in the coil and changes the phase to the water, giving up the latent heat of steam to the air in the steam to air heat exchanger. The condensate, due to the phase change, then cools by certain degree in the coil. This amount of heat is added to the zone.