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class ASHRAE9012010 < ASHRAE901
# @!group AirTerminalSingleDuctVAVReheat
# Set the initial minimum damper position based on OA rate of the space and the template.
# Zones with low OA per area get lower initial guesses.
# Final position will be adjusted upward as necessary by Standards.AirLoopHVAC.apply_minimum_vav_damper_positions
#
# @param zone_oa_per_area [Double] the zone outdoor air per area, m^3/s
# @return [Bool] returns true if successful, false if not
def air_terminal_single_duct_vav_reheat_apply_initial_prototype_damper_position(air_terminal_single_duct_vav_reheat, zone_oa_per_area)
min_damper_position = case air_terminal_single_duct_vav_reheat_reheat_type(air_terminal_single_duct_vav_reheat)
when 'HotWater'
0.2
when 'Electricity', 'NaturalGas'
0.3
end
# High OA zones
# Determine whether or not to use the high minimum guess.
# Cutoff was determined by correlating apparent minimum guesses
# to OA rates in prototypes since not well documented in papers.
if zone_oa_per_area > 0.001 # 0.001 m^3/s*m^2 = .196 cfm/ft2
min_damper_position = 0.7
end
# Set the minimum flow fraction
air_terminal_single_duct_vav_reheat.setConstantMinimumAirFlowFraction(min_damper_position)
return true
end
end
Version data entries
11 entries across 11 versions & 1 rubygems