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FanCoil.m
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FanCoil.m
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classdef FanCoil
properties
iteration
id_heating_inlet
id_heating_outlet
id_cooling_inlet
id_cooling_outlet
id_air_inlet
id_air_outlet
id_zone
time_step
matrix_size
matrix_coefficients
right_hand_side_vector
number_of_equations
specific_heat_capacity_air
specific_heat_capacity_cooling
specific_heat_capacity_heating
mass_flow_rate_air
mass_flow_rate_cooling
mass_flow_rate_heating
status_heating
status_cooling
heat_transfer_coefficient_heating
heat_transfer_coefficient_cooling
surface_heating
surface_cooling
heating_capacitance_flows_air
heating_capacitance_flows_water
heating_capacitance_flows_min
heating_capacitance_flows_max
heating_capacitance_flows_ratio
heating_number_of_transfer_unit
heating_eta
heating_effectiveness
temperature_heating_inlet
temperature_heating_outlet
temperature_cooling_inlet
temperature_cooling_outlet
temperature_air_inlet
temperature_air_outlet
temperature_zone
end
methods
function obj = FanCoil(id_heating_inlet, id_heating_outlet, id_cooling_inlet, id_cooling_outlet, id_air_inlet, id_air_outlet, id_zone, solver, specific_heat_capacity_air, specific_heat_capacity_cooling, specific_heat_capacity_heating, mass_flow_rate_air, mass_flow_rate_cooling, mass_flow_rate_heating, status_heating, status_cooling, heat_transfer_coefficient_heating, heat_transfer_coefficient_cooling, surface_heating, surface_cooling)
if nargin > 0
obj.id_heating_inlet = id_heating_inlet;
obj.id_heating_outlet = id_heating_outlet;
obj.id_cooling_inlet = id_cooling_inlet;
obj.id_cooling_outlet = id_cooling_outlet;
obj.id_air_inlet = id_air_inlet;
obj.id_air_outlet = id_air_outlet;
obj.id_zone = id_zone;
obj.time_step = solver.time_step;
obj.matrix_size = solver.matrix_size;
obj.specific_heat_capacity_air = specific_heat_capacity_air;
obj.specific_heat_capacity_cooling = specific_heat_capacity_cooling;
obj.specific_heat_capacity_heating = specific_heat_capacity_heating;
obj.mass_flow_rate_air = mass_flow_rate_air;
obj.mass_flow_rate_cooling = mass_flow_rate_cooling;
obj.mass_flow_rate_heating = mass_flow_rate_heating;
obj.status_heating = status_heating;
obj.status_cooling = status_cooling;
obj.heat_transfer_coefficient_heating = heat_transfer_coefficient_heating;
obj.heat_transfer_coefficient_cooling = heat_transfer_coefficient_cooling;
obj.surface_heating = surface_heating;
obj.surface_cooling = surface_cooling;
% heating
obj.heating_capacitance_flows_air = obj.specific_heat_capacity_air*obj.mass_flow_rate_air;
obj.heating_capacitance_flows_water = obj.specific_heat_capacity_heating*obj.mass_flow_rate_heating;
obj.heating_capacitance_flows_min = min(obj.heating_capacitance_flows_air, obj.heating_capacitance_flows_water);
obj.heating_capacitance_flows_max = max(obj.heating_capacitance_flows_air, obj.heating_capacitance_flows_water);
obj.heating_capacitance_flows_ratio = obj.heating_capacitance_flows_min / obj.heating_capacitance_flows_max;
obj.heating_number_of_transfer_unit = obj.heat_transfer_coefficient_heating*obj.surface_heating/obj.heating_capacitance_flows_min;
obj.heating_eta = obj.heating_number_of_transfer_unit^(-0.22);
obj.heating_effectiveness = 1 - exp((exp(-obj.heating_number_of_transfer_unit*obj.heating_capacitance_flows_ratio*obj.heating_eta)-1)/obj.heating_capacitance_flows_ratio*obj.heating_eta);
obj.iteration = 0;
obj.number_of_equations = 3;
obj.matrix_coefficients = zeros(obj.number_of_equations,solver.matrix_size);
obj.right_hand_side_vector = zeros(obj.number_of_equations,1);
obj.temperature_heating_inlet = solver.temperatures(obj.id_heating_inlet);
obj.temperature_heating_outlet = solver.temperatures(obj.id_heating_outlet);
obj.temperature_cooling_inlet = solver.temperatures(obj.id_cooling_inlet);
obj.temperature_cooling_outlet = solver.temperatures(obj.id_cooling_outlet);
obj.temperature_air_inlet = solver.temperatures(obj.id_air_inlet);
obj.temperature_air_outlet = solver.temperatures(obj.id_air_outlet);
obj.temperature_zone = solver.temperatures(obj.id_zone);
end
end
function h = enthalpy(~, dry_bulb_temperature, humidity_ratio)
humidity_ratio = max(humidity_ratio, 10^-5);
h = 1004.84*dry_bulb_temperature + humidity_ratio*(2500940 + 1858.95*dry_bulb_temperature);
end
function c = c_tai1(obj)
c = 1-obj.heating_effectiveness*obj.heating_capacitance_flows_min/obj.heating_capacitance_flows_air;
end
function c = c_tao1(~)
c = - 1;
end
function c = c_thi1(~)
c = obj.heating_effectiveness*obj.heating_capacitance_flows_min/obj.heating_capacitance_flows_air;
end
function c = c_r1(~)
c = 0;
end
function c = c_thi2(~)
c = 1;
end
function c = c_tho2(~)
c = - 1;
end
function c = c_tai2(obj)
c = obj.heating_capacitance_flows_air/obj.heating_capacitance_flows_water;
end
function c = c_tao2(obj)
c = obj.heating_capacitance_flows_air/obj.heating_capacitance_flows_water;
end
function c = c_r2(~)
c = 0;
end
% create matrix of coefficients and right-hand side vector
function obj = create(obj, solver)
obj.iteration = obj.iteration + 1;
obj.temperature_heating_inlet = solver.temperatures(obj.id_heating_inlet);
obj.temperature_heating_outlet = solver.temperatures(obj.id_heating_outlet);
obj.temperature_cooling_inlet = solver.temperatures(obj.id_cooling_inlet);
obj.temperature_cooling_outlet = solver.temperatures(obj.id_cooling_outlet);
obj.temperature_air_inlet = solver.temperatures(obj.id_air_inlet);
obj.temperature_air_outlet = solver.temperatures(obj.id_air_outlet);
obj.temperature_zone = solver.temperatures(obj.id_zone);
obj.matrix_coefficients = zeros(obj.number_of_equations,obj.matrix_size);
obj.right_hand_side_vector = zeros(obj.number_of_equations,1);
if(obj.status_heating)
obj.matrix_coefficients(1,obj.id_air_inlet) = obj.c_tai1();
obj.matrix_coefficients(1,obj.id_air_outlet) = obj.c_tao1();
obj.matrix_coefficients(1,obj.id_heating_inlet) = obj.c_thi1();
obj.matrix_coefficients(2,obj.id_air_inlet) = obj.c_tai2();
obj.matrix_coefficients(2,obj.id_air_outlet) = obj.c_tao2();
obj.matrix_coefficients(2,obj.id_heating_inlet) = obj.c_thi2();
obj.matrix_coefficients(2,obj.id_heating_oulet) = obj.c_tho2();
elseif(obj.status_cooling)
else
end
end
end
end