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change figure dim, remove unused chunk
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Yujie Xu committed Oct 24, 2023
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114 changes: 3 additions & 111 deletions design/FY2024/NFP-labHeatExchangerHR.md
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Expand Up @@ -73,7 +73,7 @@ effectiveness at different relative airflow, using the performance at 75% and
relative airflow from 50% to 130%. However, some heat exchangers could have
non-linear performance curves as shown in Figure 1.

![Figure 1](9-Comparison-of-effect-of-airflow-rate-on-heat-exchanger-effectiveness-for-cooling-and.png)
![Figure 1](9-Comparison-of-effect-of-airflow-rate-on-heat-exchanger-effectiveness-for-cooling-and.png width=400)

Figure 1. An example of a heat exchanger with non-linear performance curves at different airflow conditions [1]

Expand Down Expand Up @@ -235,7 +235,7 @@ specified curves all cover the range of relative airflow below 50% and above
\default Yes
\note Yes means that the heat exchanger will be locked out (off)
\note when the economizer is operating or high humidity control is active
A11, \field Sensible Effectiveness of Heating Air Flow Curve Name
A11, \field Sensible Effectiveness of Heating Air Flow Curve Name <- start of the added fields
\note optional
\note if this field has value, then field N2 and N4 will be ignored
\type object-list
Expand All @@ -250,120 +250,12 @@ specified curves all cover the range of relative airflow below 50% and above
\note if this field has value, then field N6 and N8 will be ignored
\type object-list
\object-list UnivariateFunctions
A14; \field Latent Effectiveness of Cooling Air Flow Curve Name
A14; \field Latent Effectiveness of Cooling Air Flow Curve Name <- end of the added fields
\note optional
\note if this field has value, then field N7 and N9 will be ignored
\type object-list
\object-list UnivariateFunctions


## IDD Object changes

A field (N4) will be added to the ZoneHVAC:EvaporativeCoolerUnit

ZoneHVAC:EvaporativeCoolerUnit,
\memo Zone evaporative cooler. Forced-convection cooling-only unit with supply fan,
\memo 100% outdoor air supply. Optional relief exhaust node
\min-fields 15
A1 , \field Name
\required-field
\reference ZoneEquipmentNames
A2 , \field Availability Schedule Name
\note Availability schedule name for this system. Schedule value > 0 means the system is available.
\note If this field is blank, the system is always available.
\type object-list
\object-list ScheduleNames
A3, \field Availability Manager List Name
\note Enter the name of an AvailabilityManagerAssignmentList object.
\type object-list
\object-list SystemAvailabilityManagerLists
A4 , \field Outdoor Air Inlet Node Name
\required-field
\type node
\note this is an outdoor air node
A5 , \field Cooler Outlet Node Name
\required-field
\type node
\note this is a zone inlet node
A6 , \field Zone Relief Air Node Name
\type node
\note this is a zone exhaust node, optional if flow is being balanced elsewhere
A7 , \field Supply Air Fan Object Type
\required-field
\type choice
\key Fan:SystemModel
\key Fan:ComponentModel
\key Fan:ConstantVolume
\key Fan:OnOff
\key Fan:VariableVolume
A8 , \field Supply Air Fan Name
\required-field
\type object-list
\object-list Fans
N1 , \field Design Supply Air Flow Rate
\required-field
\units m3/s
\minimum> 0
\autosizable
A9 , \field Fan Placement
\required-field
\type choice
\key BlowThrough
\key DrawThrough
A10, \field Cooler Unit Control Method
\required-field
\type choice
\key ZoneTemperatureDeadbandOnOffCycling
\key ZoneCoolingLoadOnOffCycling
\key ZoneCoolingLoadVariableSpeedFan
N2 , \field Throttling Range Temperature Difference
\note used for ZoneTemperatureDeadbandOnOffCycling hystersis range for thermostatic control
\type real
\units deltaC
\default 1.0
\minimum> 0.0
N3 , \field Cooling Load Control Threshold Heat Transfer Rate
\type real
\units W
\default 100.0
\note Sign convention is that positive values indicate a cooling load
\minimum> 0.0
A11, \field First Evaporative Cooler Object Type
\required-field
\type choice
\key EvaporativeCooler:Direct:CelDekPad
\key EvaporativeCooler:Direct:ResearchSpecial
\key EvaporativeCooler:Indirect:CelDekPad
\key EvaporativeCooler:Indirect:WetCoil
\key EvaporativeCooler:Indirect:ResearchSpecial
A12, \field First Evaporative Cooler Object Name
\required-field
\type object-list
\object-list EvapCoolerNames
A13, \field Second Evaporative Cooler Object Type <- added new fields starts here
\note optional, used for direct/indirect configurations
\note second cooler must be immediately downstream of first cooler, if present
\type choice
\key EvaporativeCooler:Direct:CelDekPad
\key EvaporativeCooler:Direct:ResearchSpecial
\key EvaporativeCooler:Indirect:CelDekPad
\key EvaporativeCooler:Indirect:WetCoil
\key EvaporativeCooler:Indirect:ResearchSpecial
A14, \field Second Evaporative Cooler Name
\note optional, used for direct/indirect configurations
\type object-list
\object-list EvapCoolerNames
A15, \field Design Specification ZoneHVAC Sizing Object Name
\note Enter the name of a DesignSpecificationZoneHVACSizing object.
\type object-list
\object-list DesignSpecificationZoneHVACSizingName
N4; \field Shut Off Relative Humidity
\note Zone relative humidity above which the evap cooler is shut off.
\type real
\minimum 0.00
\maximum 100.00
\units percent <- added new fields ends here

## Testing/Validation/Data Source(s)

The feature will be tested and demonstrated with a test file derived from 5Zone_Unitary_HXAssistedCoil.idf.
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