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1 | initial version |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's 'total' capacity.
2 | No.2 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's design 'total' capacity.
3 | No.3 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's design 'total' capacity.
$$ Q_{coil} = \rho \cdot V \cdot ({h_{in} \cdot h_{out})}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
4 | No.4 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's design 'total' capacity.
$$ Q_{coil} = \rho \frac {\rho \cdot V \cdot ({h_{in} \cdot h_{out})}$$h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
5 | No.5 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's design 'total' capacity.
$$ Q_{coil} = \frac {\rho \cdot V \cdot ({h_{in} \cdot h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air, if OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CatFT value is determined by entering the Indoor/Outdoor Temperature at Peak Load into the performance curve to find the value used in the coil sizing model.
6 | No.6 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' load, and then includes the DX coil 'SHR' and 'capacity as a function of temperature performance curve' to calculate the coil's design 'total' capacity.
$$ Q_{coil} = \frac {\rho \cdot V \cdot ({h_{in} \cdot h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air, if OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CatFT value is determined by entering the Indoor/Outdoor Temperature at Peak Load into the performance curve to find the value used in the coil sizing model.
7 | No.7 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the 'sensible' sensible
load, and then includes the DX coil 'SHR' and 'capacity SHR
and capacity
as a function of temperature performance curve' curve to calculate the coil's design 'total' total
capacity.
$$ Q_{coil} = \frac {\rho \cdot V \cdot ({h_{in} \cdot h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air, if OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CatFT value is determined by entering the Indoor/Outdoor Temperature at Peak Load into the performance curve to find the value used in the coil sizing model.
8 | No.8 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the sensible
load, and then includes the DX coil SHR
and capacity as a function of temperature performance curve
to calculate the coil's design total
capacity.
$$ Q_{coil} = \frac {\rho \cdot V \cdot ({h_{in} \cdot h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air, if air. If OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CatFT CapFT value is determined by entering the Indoor/Outdoor Temperature at Peak Load into the performance curve to find the value used in the coil sizing model.
9 | No.9 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the sensible
load, and then includes the DX coil SHR
and capacity as a function of temperature performance curve
to calculate the coil's design total
capacity.
$$ Q_{coil} = \frac {\rho \cdot V \cdot ({h_{in} \cdot - h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temp
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air. If OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CapFT value is determined by entering the Indoor/Outdoor Temperature at Peak Load into the performance curve to find the value used in the coil sizing model.
10 | No.10 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the sensible
load, and then includes the DX coil SHR
and capacity as a function of temperature performance curve
to calculate the coil's design total
capacity.
$$ Q_{coil} = \frac {\rho V ({h_{in} - h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air WB temptemperatures
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air. If OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CapFT value is determined by entering the Indoor/Outdoor Temperature Temperature, converted to wet-bulb temperature, at Peak Load into the performance curve to find the value used in the coil sizing model.
11 | No.11 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil is sized to meet the sensible
load, and then includes the DX coil SHR
and capacity as a function of temperature performance curve
to calculate the coil's design total
capacity.
$$ Q_{coil} = \frac {\rho V ({h_{in} - h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air temperatures
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air. If OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CapFT value is determined by entering the Indoor/Outdoor Temperature, converted to wet-bulb temperature, at Peak Load into the performance curve to find the value used in the coil sizing model.
The OA included in the coil sizing equation is the OA mixed with return air at the outdoor air system mixing box. This mixing of OA impacts the coil inlet air conditions. Infiltration will show up in the zone indoor conditions reported in HVAC Sizing Summary.
12 | No.12 Revision |
The Component Sizing Summary and Equipment Summary in the table reports show the DX coil size as total capacity (sensible + latent) reported as W (or Btu/hr if requested). The zone load is reported as sensible energy to meet the zone thermostat set point temperature. Ventilation and Infiltration are included in the coil sizing if these OA components are included in the model. The coil airflow is sized to meet the zone sensible
load, and then includes the DX coil SHR
and capacity as a function of temperature performance curve
to calculate the coil's design total
capacity.
$$ Q_{coil} = \frac {\rho V ({h_{in} - h_{out})}}{CapFT}$$
where:
$Q_{coil}$ = coil total cooling capacity (sensible + latent)
$\rho$ = coil inlet air density
V = zone air volume flow rate determined by sizing routine (see *zsz.csv)
$h_{in}$ = coil inlet air enthalpy at peak time including OA
$h_{out}$ = coil outlet air enthalpy as specified in Sizing:Zone object
CapFT = capacity as a function of temperature curve output at coil inlet air temperatures
Update based on comment: The HVAC Sizing Summary report will show the values for User Design Air Flow. The indoor temperature and humidity ratio shown here does not include outdoor air. If OA is used, calculate a mixed air inlet condition using the OA fraction (OA flow/user design flow). Then use the mixed air condition to calculate coil inlet air density and enthalpy. The CapFT value is determined by entering the Indoor/Outdoor Temperature, converted to wet-bulb temperature, at Peak Load into the performance curve to find the value used in the coil sizing model.
The OA included in the coil sizing equation is the OA mixed with return air at the outdoor air system mixing box. This mixing of OA impacts the coil inlet air conditions. Infiltration will show up in the zone indoor conditions reported in HVAC Sizing Summary.