new apachehvac features in ve 2012

Copyright © 2012 Integrated Environmental Solutions Limited. All rights reserved.

ApacheHVAC in VE 2012

Con

den

ser

Eva

pora

tor

Expansion device

Compressor

Secondary pump

Primary pump

Cooling coil or chilled ceiling

Electric water cooled chiller

Condenser water pump

Condenser water loop Chilled water loop

Tect

TletTlct

Tedb

ge

Tldb

glCooling tower

Towb

G

L T1

T2

Key:

air

water

Vc Ve

Open cooling tower

Water source heat exchanger

Solar water heater

Heat recovery

Air-to-water heat pump

Combined heat and power

Boiler(s)

To water source (lake, well, etc.)

Primary pump

Secondary pump

Com

mon

pip

e

Wat

er-t

o-ai

r h

eat p

ump

Hea

ting

coil

Wat

er-t

o-ai

r h

eat p

ump

Hea

ting

coil

Wat

er-t

o-ai

r h

eat p

ump

Wat

er-t

o-ai

r h

eat p

ump

Coo

ling

co

il

Coo

ling

co

il

Towb

Te

wb

Te

wt

Te

wt

Te

wt

Te

wt

Key: water air

Coo

ling

co

il

Hea

ting

coil

Te

db

Cooling tower loop pump

Water-to-water heat exchanger

Cooling tower loop


• Numerous customizable pre-defined systems and equipment options in HVAC library• Components based modeling affords exceptional flexibility and controls modeling

• Pre-define conventional and advanced systems can be modified to match design• Supports interaction with thermal models for nat-vent, DSF, labyrinths, UFAD, etc.

• Multiple systems, models, and VE modules can interact within a single thermal zone.• Increasingly user-friendly system setup, sizing, and customization• System loads/sizing reports and detailed results analysis options

ApacheHVAC: Flexible modeling of standard and advanced systems

With the addition of a few controls (or using the 07c Mixed-mode VAV system from the HVAC library), a standard VAV system with chilled and hot-water loops can become a mixed-mode system integrated and interacting with natural ventilation at every simulation time step.


• HVAC library offers import & export of pre-defined and custom systems, equipment, and controls• Predefined conventional multi-zone VAV systems, for example, include…

• Single- and “dual-max” VAV controls; airflow- or SAT-first cooling control strategies• Coil water flow control for LAT-first re-heat control strategy• Night-cycle operation with minimum fan flow rate and OA min or off• OA economizer: DBT, WBT, or DPT limits, diff enthalpy, mixed temp reset• Demand-controlled ventilation (zone CO2-based DCV); separate EA & transfer paths• Chilled-water, DX, or evaporative (IDE or IDDE) cooling; simple or advanced coil models;

• Predefined non-standard systems include…• Mixed-mode (mech/nat-vent), UFAD, active chilled beams, DOAS, DCV, radiant panels, etc.

• Expanded waterside capabilities cover a broad range of equipment configurations for heating, cooling, pre-heating, pre-cooling, waterside economizes, heat recovery, heat transfer, and more.

Systems and components offer many options – simple to detailed

Open cooling tower


Solar water heater

Heat recovery



Boiler(s)


Primary pump

Secondary pump

Com

mon

pip

e

Wat

er-t

o-ai

r he

at p

ump

Hea

ting

coil

Wat

er-t

o-ai

r he

at p

ump

Hea

ting

coil

Wat

er-t

o-ai

r he

at p

ump

Wat

er-t

o-ai

r he

at p

ump

Coo

ling

coil

Coo

ling

coil

Towb

Tew

b

Tew

t

Tew

t

Tew

t

Tew

t

Key: water air

Coo

ling

coil

Hea

ting

coil

Ted

b



Cooling tower loop


• New interface, HVAC systems library, editing tools, and waterside features.

ApacheHVAC in VE 2012


• New prototype systems, enhanced selection tree, and mouse-driven placement.

HVAC Systems Library


• Expanded import options for HVAC equipment, profiles, and fuels/energy end-use.



• Export complete systems or any subset to a user library.• Export options for selection, HVAC equipment, profiles, and fuels/energy end-uses



• System and multiplex “containers” aid selecting, naming, moving, copying, and export.

• New options for adding multiplex layers when assigning from room/zone group.

System and Multiplex editing


• Updated and better organized toolbars

• New system network drawing interface:

• Drag & drop Move and Copy• Select-drag MOVE • Select-Ctrl-drag COPY

• Stretchable controller and sensor leads

• Start-cusp-end drawing of network paths with minimal mouse clicks using “pencil”

• New mouse-keyboard shortcuts

User interface and controller editing


• System setup & sizing toolbar in ApacheHVAC• System schedules• Parameters• Zone-level sizing• 62.1 ventilation• System-level sizing• Sizing reports

System setup, main input parameters, autosizing, and reports

Focus on current HVAC file eliminates need for “proposed.asp” target file.*

*This file naming convention is still auto-generated and required when using the ASHRAE 90.1 PRM Navigator.


Heat transfer loop

• Extensive control over loop parameters and sizing.


Heat transfer loop

• Numerous options for heat acquisition/pre-heat and heating equipment sequencing.


Heat transfer loop

This conceptual diagram of the new heat transfer loop in ApacheHVAC shows it as configured for zone-level water-loop (water-to-air) heat pumps, as well as a range of optional heating and cooling sources. Not all options , such as fluid cooler vs. cooling tower, are shown. Connections to other loops, such as for condenser heat recovery from a CW loop, are also not shown on this diagram.

Open cooling tower


Solar water heater

Heat recovery



Boiler(s)


Primary pump

Secondary pumpC

om

mon

pip

e

Wat

er-

to-a

ir h

eat

pu

mp

He

atin

g c

oil

Wat

er-

to-a

ir h

eat

pu

mp

He

atin

g c

oil

Wat

er-

to-a

ir h

eat

pu

mp

Wat

er-

to-a

ir h

eat

pu

mp

Co

olin

g co

il

Co

olin

g co

il

Towb

Te

wb

Te

wt

Te

wt

Te

wt

Te

wt

Heat transfer loop

Key: water air

Co

olin

g co

il

He

atin

g c

oil

Te

db



Cooling tower loop


Heat transfer loop

• Water-source heat exchanger for heat acquisition and/or rejection.• Cooling tower and wet/dry fluid cooler options for heat rejection.


Water-to-air heat pumps

• Water-to-air heat pumps (WAHPs) with heating and cooling modes • Zone-level devices that attach to a common heat transfer loop


Water-to-air heat pump coils

• New dedicated variants of the “simple coil” model for use with WAHPs


Waterside modeling

• Chilled water pre-cooling loop• cooling tower• fluid cooler• water-source heat exchanger

• Enhanced heat transfer from condenser-water loop to hot water and heat transfer loops

• Selection of recipient moved to recipient loop (remains displayed on provider loop)


Enhanced Heat Recovery

• Choice of percentage availability and explicit heat transfer models for both hot-water loop and heat-transfer loops

• Multiple heat recovery sources (i.e., more than one CW loop) now permitted with percentage availability model

• Optional WWHP can be used to upgrade heat from each source can to higher HTL or HWL temp

• Fixed COP (steady-state performance) when used with the simpler percentage availability CHR model


Enhanced Heat Recovery

• Explicit model for inter-loop heat exchanger

• Design effectiveness at loop design temperatures

• Effectiveness varies with delta-T between loops

• For use with single source and recipient loops

• Simple WWHP for optional upgrade of recovered heat from CW temperature to higher HTL or HWL temperatures.

• COP settings for two specified thermal lift (delta-T) data points

• Linear interpolation of COP between data points


Waterside modeling

• Radiators and chilled ceilings now see temperature variation of connected water loop (design temp, reset, or off-design temps when “underserved”), and are compatible with integrated waterside economizer operation.

• Defined types have been made “scalable” via number of units input in the radiator and chilled ceiling dialogs.

• Autosizable radiators and chilled ceilings will be included in the next feature pack. This will provide autosized water flow rate and number of units, and will also add several related design parameters to the dialogs for radiators and chilled ceilings.


DX Cooling

• Separation of DX Cooling performance characteristics in type dialog from sizing for each instance

• Type provides performance curves, rated COP, condenser fan EIR, and rating conditions.

• Coil dialog includes capacity, coil contact factor, design conditions, and resulting design COP.


Usability enhancements

• Expanded HVAC network integrity checks with highlighting of opposing flows

• Separate oversizing factor for fans and new system-level fan min flow rate parameter

• Specification of infiltration rate in terms of l/s or cfm per unit façade area, rather than floor area (in thermal templates and room data Air Exchanges )

• Coupling of OR connections to controllers without sensors

• Refinements to modeling and controls (behind the scenes) for coils and water loops

• New pre-defined HVAC systems using VE 2012 capabilities


IES <Virtual Environment> Integrated building performance analysis

6.41

4.51

3.64

1.93

0.26

3.85

4.13

4.19

0.64

0.36

0.36

0.49

0.21

VAV Baseline

VAV with WSFC

VAV+WSFC-precool

Radiant+DOAS

Cooling Season HVAC System Energy

Chillers (VAV only), cooling towers, and chilled water pumps (MWh)

Hydronic system pumps and evaporative cooling spray pump (MWh)

Fans (including cooling tower fan for waterside free cooling) (MWh)

Boilers, natual gas (MWh)

Estimated savings = 62 to 71%

May – September Denver, Colorado (TMY climate data)

new apachehvac features in ve 2012

Technology