kbenne / cbecc Goto Github PK

What SDD Object:Property(s) are relevant to this issue?
Space:SpaceConditioningType


Explanation of addition, revision, or clarification:
Need to add 'Conditioned' to enumerations for Space:SpaceConditioningType



Proposed resolution:
See Above



Please provide any additional information below.

Errors reported when performing compliance analysis on project

What steps will reproduce the problem?
1. Load project (supplied by user and attached here)
2. Perform analysis -> throws errors

Inputs look complete and should result in valid pass/fail result.

What NACM Section(s) are relevant to this issue?
Table 5.5.1 in Appendix 5.5c
Table 143-B in Appendix 5.5c

Explanation of issue:

For metal framed walls with 0.105 u-value no description exists in the Table 
5.5.1 for where to find the details for that wall. 

Proposed resolution:

Add reference in Table 5.5..1


Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
CoilCooling:DxEnergyInputRatio



Explanation of addition, revision, or clarification:
The SDD and NACM currently describe DX coil efficiency using EIR (1/COP), 
however, OS/E+ uses COP to define DX coil efficiency. 


Proposed resolution:
For clarity on translation, might consider adding the SDD term 
CoilCooling:DXCOP to be inline with OS/E+ inputs. This is a debatable addition, 
as having two properties over-defines the coil efficiency.  If only DXCOP was 
used in SDD, NACM should probably be revised to be consistent. 


Please provide any additional information below.
THIS ISSUE ORIGINALLY SUMMARIZED IN "SDD_XML_to_OSM_Review-20120604.docx"

What NACM Section(s) are relevant to this issue?
2.2.6


Explanation of issue:

In the criteria used to define with space use classifications can be combined 
into a thermal block, the term "operating schedule" is pretty nebulous.  
Suggest this section be more specific on what schedules (lighting, occupancy, 
plugs) or internal loads need to be the same. 


Proposed resolution:

Clarify in this section or refer to other NACM section that has specific 
criteria/rules for combining space uses (SDD Space) into a thermal block. 


Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

The UndergroundFloor can be specified as either f-factor or as a layer by layer 
construction. Add to the SDD a new switch to show which is being used. Perhaps 
"MethodUsed" can be the name of the switch.

[deleted issue]

What SDD Object:Property(s) are relevant to this issue?
Project


Explanation of addition, revision, or clarification:
Although not updated to reflect this, my understanding is that the baseline 
HVAC system map will be revised so that the system type fuel source will be 
revised to be dependent on availability of fossil fuel energy source (Natural 
Gas, Propane, etc). Coordinate with John on final language, which may affect 
the name.



Proposed resolution:
Add Project:FossilFuelIsAvailable to SDD, datatype Boolean



Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
ExtWall:DisplayPerimeter


Explanation of addition, revision, or clarification:
The requirement to calculate maximum Window Wall Ratio (WWR) for both west 
facing facades and the entire building separately requires that we sum the 
DisplayPerimeters at the ExtWall level.  

DisplayPerimeter appears in the SDD as a property of Space:Wall, however 'Wall' 
has been excluded from the SDD


Proposed resolution:
Add property 'DisplayPerimeter' to the object 'ExtWall'




Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.7.2.1, Night Cycle HVAC Fan Control


Explanation of issue:
Input restriction is "As Designed", and baseline rule is to "Stay Off"  


Proposed resolution:
Suggest revise rules for both baseline and proposed to be "Cycle On Any".  
If it was required for both the proposed and baseline (as it is for 90.1 App 
G), this would help ensure, at minimum, that the maximum/minimum unoccupied 
temperatures do not exceed the setback temp (+/- throttling range) for both the 
proposed and baseline cases. If not required for both proposed & baseline, I 
see this as an opportunity to game the system since flipping night-cycling 
on/off is easy to do and people likely will specify what provides more 
compliance margin, not necessarily how the building is actually going to be 
controlled (I doubt that the code reviewers will dig through the seq of ops to 
figure this out, if a seq of ops even exists).

Also, please suggest clarifying that ventilation dampers should be closed 
during night cycling.  This is separate from night purge, which is a control 
scheme that is address separately in the NACM.



Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

What NACM Section(s) are relevant to this issue?
5.1.2, HVAC System Map


Explanation of issue:
For determining the baseline HVAC system, clarify if the number of floors is 
above-grade or above+below-grade.  I believe 2008 ACM was above-grade.


Proposed resolution:
Revise to be consistent with Appendix G.



Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

What NACM Section(s) are relevant to this issue?
5.7.5.1 - Cooling Capacity Adjustment Curves


Explanation of issue:
There are two curves used to describe the OS/IDF cooling coil capacity and EIR 
as a function of coil air flow fraction that are not defined in the NACM.  


Proposed resolution:
Related to previously defined issue on coil bypass factor, suggest clarifying 
how the DOE-2 based coil performance curves will be translated to OS/IDF. 


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.7, 5.8

Explanation of issue:

HMG has given us a detailed list of inputs for modeling floor-based radiant 
cooling.  I can include these as building descriptors, but this raises the 
question: for what HVAC systems and components should we provide a detailed ACM 
input specification?

Chilled beams, DV, UFAD, VRF, Ground-source heat pump, etc.


Proposed resolution:

Identify which systems are in the main ACM and which are optional. Should we 
provide a separate chapter for optional capabilities?


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

Appendix 5.5c Table 5.5.1
Table 4.4.3 in JA4


Explanation of issue:

For Metal Framed Walls for Nonresidential Construction the uvalues shown in 
Table 5.5.1 and the references are shown as:

 0.062  4.3.3-H1,H24
 0.082  4.3.3-G1,G24
 0.098  4.3.3-F1,F24

But if you go to the Table 4.4.3 the values for 0.062, 0.082 and 0.098 do not 
correspond to H1,H24 or G1,G24 or F1,F24

Proposed resolution:

Fix references to the correct column and row in the table.


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.7.3.2 - Supply Fans
5.7.3.3 - Return/Relief Fans
5.7.3.4 - Exhaust Fans


Explanation of issue:
It appears OS/IDF supports NACM method #2 (TSP, fan efficiency, and motor 
efficiency) to determine fan power.  
The current NACM indicates that the power per unit flow method shall be used 
when no proposed fan performance data is provided, and the brake horsepower 
method for the baseline design.  


Proposed resolution:
Suggest revising the NACM to define a default fan efficiency (for all supply, 
return, etc) so that properties for the static pressure method can be 
calculated by rules and used in OS/E+ models.


Please provide any additional information below.
THIS ISSUE ORIGINALLY SUMMARIZED IN "SDD_XML_to_OSM_Review-20120604.docx"

What NACM Section(s) are relevant to this issue?

5.8.3 Cooling Tower

Explanation of issue:

ACM seems inconsistent since both 95F and 10F range are described. For Cooling 
Tower Design Return Water Temperature the baseline rule is "Set to 95°F for a 
range of 10 F" is only valid when the Cooling Tower Design Entering Water 
Temperature is 85 and the rules for that are more complex and it will not 
always be 85. Should the return temperature always be 95F or should the range 
always be 10F?


Proposed resolution:




Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.1.2, HVAC System Map - Table 1


Explanation of issue:
In Table 1: Not sure I understand what is stated for System 10: "...or 
noncomputers are System 4 or 5" means.  


Proposed resolution:
Please revise Table for clarity.



Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

[deleted issue]

[deleted issue]

What NACM Section(s) are relevant to this issue?

Layer as described in 5.5.4 Exterior Wall


Explanation of issue:

I believe the Layer section is redundant to the Wall Construction


Proposed resolution:

Remove Layer section.


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.9 Miscellaneous Energy Uses

Explanation of issue:

The ACM expresses hot water load as Btu/h per person. EnergyPlus expresses the 
load in terms of flow rate (gpm or m3/s).


Proposed resolution:

For EnergyPlus we will have to translate the Btu/h load into a flow rate, using 
the heating setpoint temperature (135?) and the mains temperature, which can 
vary somewhat for different climates.



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.3.6, Natural Ventilation
5.7.2.1, Air Handler Fan Cycling  



Explanation of issue:
There is inconsistency and is not clear how natural ventilation should be 
modeled.

5.3.6, Natural Ventilation (green text) says:
"For California Compliance, natural ventilation shall not be modeled." 

5.7.2.1 Air Handler Fan Cycling input restrictions says:
For natural ventilation systems, an air conditioner is modeled in the proposed 
design even though one is not specified for the proposed design. This fan in 
the simulated air conditioner is allowed to cycle with loads since the 
simulated air conditioner is assumed to operate only when natural ventilation 
is unable to satisfy thermal comfort."



Proposed resolution:
Please revise for consistency



Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

Misc changes based on SharePoint data on 6/21/12 AM -

Remove AirInfiltrationRate from SDD
Revise SDD enumeration for FenestrationFraming to include (only): 
MetalWithThermalBreakFraming, MetalFraming & NonMetalFraming  (mapping to table 
110.6-A&B)

Note re: future revision - once we get into fenestration rule development we 
are likely to add a NFRCRated property, but probably an enumeration vs. a 
toggle to address whole window vs. center-of-glass inputs.  No changes on this 
front for now though.

What SDD Object:Property(s) are relevant to this issue?
All objects who's geometry is defined by polyloops
i.e. ExtWall, Window...


Explanation of addition, revision, or clarification:
To avoid unnecessary function calls and simplify rule writing/readability, 
suggest adding new properties to ExtWall, Window and other objects who's 
geometry is defined by polyloops.  Initially, the properties 'Area', 'Tilt', 
and 'Azimuth' are suggested for Exterior Walls, and Windows, but this list may 
be expanded based on others' reactions to this suggestion.

Proposed resolution:
See above.  
Alternatively, if the group feels this would add to much size/complexity to the 
SDD, we can create a rule-list to generate and populate RULE NEW's for these 
types of properties that are likely to be referenced often in other parts of 
the ruleset.




Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.8.2 Chillers


Explanation of issue:

From COMNET Comments: In the chiller section, might be good to add variable 
speed chillers that have different EIR performance curves which depend on the 
difference between the leaving chilled water temperature and the entering 
condenser water temperature as well as chiller part-load ratio. Again DOE-2.2 
has details.



Proposed resolution:

Add performance curve coefficients for variable speed chillers as needed.



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.8.3 cooling tower capacity adjustment

Explanation of issue:

The form of the curves for cooling tower capacity adjustment are DOE-2 specific 
and should be made more generic to be able to be interpreted by other programs 
such as EnergyPlus.


Proposed resolution:




Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
Fan:Position


Explanation of addition, revision, or clarification:
This is a new term.  Defined in NACM section 5.7.3.2, needed to communicate 
location of supply fan in relation to htg/clg coil


Proposed resolution:
Add property Fan:Position
Enumerations: DrawThrough, BlowThrough


Please provide any additional information below.
Identified in July PAC OS/SDD translation review.

What NACM Section(s) are relevant to this issue?

Appendix 5.4A

Explanation of issue:

The internal heat gain from occupants in the Appendix is expressed in terms of 
Sensible Heat Gain and Latent Heat Gain per person. EnergyPlus has additional 
inputs for a schedule of gains, and expresses the heat gain in terms of total 
heat gain and sensible heat ratio.


Proposed resolution:

No changes to ACM. Add minor clarification to indicate that the heat gain per 
person for a given space type is constant. 


Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
Space


Explanation of addition, revision, or clarification:
Currently, there is not Space property that defines the whether the space is 
considered Residential or Nonresidential.  This could be inferred from the 
SpaceOccupancy. 

Also might consider adding these terms that are important to rules:
Bldg:NonresidentialFloorArea
Bldg:ResidentialFloorArea



Proposed resolution:
Suggest discussing properties with SDD working group whether there should be a 
property that clearly defines the occupancy classification 
(Space:OccupancyClassification) and related Building properties.



Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
AirSystem:AirSysClgCtrl


Explanation of addition, revision, or clarification:
This must be a new(er) addition in NACM 5.7.2.2; currently missing the 
enumeration "StagedSetpoint" in the SDD. 


Proposed resolution:
Add enum "StagedSetpoint to SDD


Please provide any additional information below.
The RULE that sets this particular property is actually the focus of an example 
shown in the July PAC demo.  So, for consistency between the RULE example and 
the SDD, this enum should be added prior to that.  Thanks!

What NACM Section(s) are relevant to this issue?
5.1.2, HVAC System Map - Table 1


Explanation of issue:
In Table 1, are Systems 7 & 8 only used in buildings Nres <3floors or <25Ksf, 
or would these systems be assigned to thermal blocks with design cooling >110 
KBtu/hr, independent of building stories/size?  


Proposed resolution:
If so, please revise ACM table for clarity, such as adding a separate row for 
these systems: Building/Thermal Block Type -> Thermal block design load >110 
kBtu/hr.


Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

New Object:  DoorConstruction - DrCons
Notes:  Applies only to opaque doors (doors that are < 50% glazed - as with 
Door object).  Baseline Ufactor defined in Standard table 140.3-B, default 
proposed Ufactors defined in Joint Appendix 4, table 4.5.1

DrCons Properties:
DoorConstructionOperation - DrConsOper - enummeration - NonSwinging, Swinging   
(based on std tbl 140.3-B)
DoorConstructionType - DrConsType - enumeration - 
UninsulatedSingleLayerRollupMetal, UninsulatedSingleLayerMetal, 
UninsulatedDoubleLayerMetal, InsulatedSingleLayerSectionalMetal, 
InsulatedSwingingMetal, WoodThick, WoodOther
(based on JA4 tbl 4.5.1 - note that certain DrType options are specific to 
DrOper selection)
DoorConstructionNFRCRated - DrConsNFRCRtd - boolean - whether or not door is 
NFRC rated (in which case user can specify the Ufactor)
DoorConstructionUFactor - DrConsUFactor - (decimal - same units & other info as 
existing UFactor property)

Changes to existing Door object:
Replace ConstructAssemblyReference with DoorConstructionReference property
Remove DoorType property (now defined as DrCons:DrOper, since that is where the 
dependent Ufactor is defined)

What NACM Section(s) are relevant to this issue?
5.7.5.1 - Coil Bypass Factor


Explanation of issue:
NACM describes the sensible/latent performance of cooling coils using bypass 
factor and related curves, which is indicative of the DOE-2 coil model. The IDF 
cooling coil model uses the rated coil capacity and rated SHR to calculate the 
rated BF.  It then uses the NTU heat exchanger model to determine the coil BF 
at non-rated air flow rates. Given that coil modeling methods of the NACM and 
E+ differ, it is not clear how the current NACM properties are going to be 
translated.  


Proposed resolution:
Suggest revising NACM/SDD to describe properties for both methods, or have E+ 
development team provide an outline for how DOE-2 coil model properties will be 
translated to the E+ coil model, and add to NACM as a reference document.


Please provide any additional information below.
THIS ISSUE ORIGINALLY SUMMARIZED IN "SDD_XML_to_OSM_Review-20120604.docx"

What SDD Object:Property(s) are relevant to this issue?
ThermalZone
Building


Explanation of addition, revision, or clarification:
One dependency of baseline system types are design heating and cooling loads 
determined from sizing runs.  Currently, no ThermalZone property that describes 
this.


Proposed resolution:
Review with SDD workign group the following additions:
ThermalZone:DesignCoolingLoad
ThermalZone:DesignHeatingLoad

Useful reporting information will also be the sum total building loads, so may 
also consider the following properties at the Building object:
Building:ConincidentDesignCoolingLoad
Building:ConincidentDesignHeatingLoad
Building:NonConincidentDesignCoolingLoad (sum of ThermalZone:DesignCoolingLoad)
Building:NonCoincidentDesignHeatingLoad (sum of ThermalZone:DesignHeatingLoad 




Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.4.3 Interior Lighting

Explanation of issue:

The 2008 ACM has an equation for calculating the illuminance setpoint that is 
dependent on the LPD. For the revision I am considering replacing this with a 
fixed baseline setpoint by space type - a look-up table rather than an equation.


Proposed resolution:

Remove the following equation: 

LIGHT-SET-PT = CUlite x LumEff x LPDgen x LDD

and replace with a table lookup of illuminance setpoint (fc) for each area 
category type in Appendix 5.4A.



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.8.3 

Explanation of issue:

Related to ACM Cooling Tower Setpoint Control add Project:HtRej:SetPointControl 
and Project:HtRej:SetPoint

Related to CoolingTower Low-Speed Airflow Ratio add
Project:HtRej:LowSpeedAirflowRatio

Related to Cooling Tower Low-Speed kW Ratio add 
Project:HtRej:LowSpeedAirflowRatio

Related to Cooling Tower Power Adjustment Curve add Project:HtRej:Power_fPLR

Related to Cooling Tower Minimum Speed add Project:HtRej:MinSpeedRatio

Proposed resolution:

add terms to SDD


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.7.5.2 - Direct Expansion

Explanation of issue:
The current NACM has one large section called “Direct Expansion Efficiency 
Adjustment Curve”, which includes information on calculating both full load 
efficiency, and part load curves.  


Proposed resolution:
Suggest revising this NACM section into at least two parts:
1) A section with relevant text/equations for calculating full-load efficiency
2) A section with relevant text/equations for describing the efficiency 
adjustment curves.


Please provide any additional information below.
THIS ISSUE ORIGINALLY SUMMARIZED IN "SDD_XML_to_OSM_Review-20120604.docx"

What NACM Section(s) are relevant to this issue?

5.8.3 Cooling Tower Capacity Control

Explanation of issue:

Do we really want all of these exceptions in baseline rules? For Cooling Tower 
Capacity Control do we really want this complex a rule with all four of these 
exceptions?

This issue has been discussed in the past and perhaps it just hasn't yet been 
incorporated into the version of the ACM that was available when I posted this 
issue.


Proposed resolution:

Remove some exceptions.


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.5.3 Roof - Roof Type

Explanation of issue:

Current text says "The roof classification is the same as the proposed design 
shall be metal building (insulation entirely above deck)".

The part in parenthesis "insulation entirely above deck" is not consistent with 
how metal building is always described. Is this the intent to keep this or is 
it left over from how 90.1 describes the same construction.


Proposed resolution:




Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
2.2.11 - Plenums


Explanation of issue:
In a meeting to review the baseline HVAC system map a few months ago, we 
discussed the complication that the proposed and baseline thermal zones may be 
served by different HVAC systems.  Therefore, if the modeler has consolidated 
plenum zones to correspond to the proposed design, it may not be possible to 
properly allocate the plenum zones to the appropriate baseline HVAC system.


Proposed resolution:
Revise NACM to specify:
"If plenums are modeled in the proposed design, they should also be modeled in 
the baseline building, and a unique plenum thermal block is created for each 
thermal block that defines the conditioned space.  That is, a 1:1 relationship 
between the plenum and the corresponding non-plenum thermal blocks is modeled 
for all systems with plenums."



Please provide any additional information below.

What SDD Object:Property(s) are relevant to this issue?
Project, or perhaps new Project object called DesignDay
Schedule

Explanation of addition, revision, or clarification:
Need to outline relevant properties and other additions to SDD for design day 
sizing of HVAC systems. 



Proposed resolution:
Outline additions and submit proposal to SDD working group for review.  Need to 
coordinate final proposal with John's final HVAC sizing criteria/scheme



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.7.5

Explanation of issue:

The part-load efficiency curves for DOE-2 (EIR-FPLR) are different curves than 
the part load factor correlation used by E+ (PLF). They are related by: 
EIR-FPLR = PLR / PLF.  When I convert the DOE-2 curves to the PLF format they 
don't match what I see in E+.


Proposed resolution:

Use DOE-2 part-load curves and convert to E+ PLF format, and supply both curves 
in the ACM.  If there is justification for using the E+ curve we can adjust the 
DOE-2 defaults, but I'm not aware of any special reason for using them over the 
DOE-2 curves.  Moreover, DOE-2 provides different defaults by equipment system 
type.


Please provide any additional information below.

See attached file with a rough analysis of part-load curves, and a comparison 
of DOE-2 with E+ curves (second tab).

What NACM Section(s) are relevant to this issue?
JA4 Table 4.6.2 Conductivity Calculation


Explanation of issue:
Stated method of calculating conductivity: "Divide the published C-factor by 
the thickness(T)."  

Recommended change: "Multiply the published C-factor by the thickness(T)."



Proposed resolution:
Modify Language to above recommendation.



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
T24 Part 6 100.1, Definitions


Explanation of issue:
Definitions section includes "Nonresidential Function Areas", but does not have 
a similar definition for "Residential Function Areas".  Residential Space Types 
are listed, but these appear to only apply to single-family/low-rise res 
buildings.  



Proposed resolution:
Revise definitions of residential function areas to follow the Nonresidential 
definition structure 



Please provide any additional information below.

[deleted issue]

[deleted issue]

What NACM Section(s) are relevant to this issue?
2.4
2.5


Explanation of issue:
Clarify proposed and baseline sizing procedures and limits.  
Also, add clear definition of what is considered an unmet load hour is.  Are 
they:

a) Only specific to thermal zones, or are unmet plant load hours also included? 

b) Heating + cooling zone hrs, or separate limits for each?
c) Coincident or non-coincident zone hours?



Proposed resolution:
No auto-sizing proposed. Use E+ sizing routine for baseline.  Sizing for both 
buildings is acceptable provided both have <300 unmet load hours.  unmet load 
hour is zones only, non-coincident, heating or cooling combined.  



Please provide any additional information below.
THIS ISSUE PREVIOUSLY INCLUDED IN RuleAuthors Item Tracking spreadsheet

What NACM Section(s) are relevant to this issue?

5.5.5 Exterior Floors
5.5.9 Slab Floors in Contact with Ground

Explanation of issue:

The Slab-on-grade floor construction section does not seem to belong in section 
5.5.5 but should probably be in 5.5.9


Proposed resolution:

Move/merge into 5.5.0


Please provide any additional information below.

What NACM Section(s) are relevant to this issue?
5.2.1, HVAC System Map


Explanation of issue:
Last discussions on baseline HVAC system fuel source was going to be determined 
based on the availability of natural gas or other fossil fuel available at the 
project site. 



Proposed resolution:
Revise section and HVAC system map to reflect this change



Please provide any additional information below.

What NACM Section(s) are relevant to this issue?

5.8.3 Cooling Towers

Explanation of issue:

For condenser water reset, the two options are fixed or a wet-bulb reset. 
However, from COMNET there is a Reset Ratio term which provides a dial for a 
reset that is somewhere between a fixed approach to wet-bulb and a fixed CWS 
temperature.  The default for the Reset Ratio is 0.29. I don't know where this 
control strategy comes from and I don't know if the simulation tools can 
readily model it.


Proposed resolution:

Remove Reset Ratio and have either a wet-bulb based reset with fixed approach 
or a fixed condenser water supply temp (the baseline is fixed at 70F).



Please provide any additional information below.