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[EnergyPlus_Support] Efficiency of Air Cooled Chillers

To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: [EnergyPlus_Support] Efficiency of Air Cooled Chillers
From: "Ian Doebber" <ian.doebber@xxxxxxxx>
Date: Mon, 13 Aug 2007 12:06:41 -0700
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Thread-index: Acfd12gsR3kaNPgOSBWtRigKul57kgABWiVw
Thread-topic: Efficiency of Air Cooled Chillers

I've looked a the data sets for chillers but they are all for water
cooled.  I'm interested in the same information (efficiency data based
on part load and various condenser temperatures for two chilled water
temperatures (45 F and 28 F) for an air cooled screw chiller.  I need
this information to understand the energy consumption with an integrated
TES system.  Any idea where I could obtain this information? 

 

Thanks

 

 

Ian Doebber

Arup

Mechanical Engineer

Cell : 415-613-4314

Fax : 415-957-9096

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of
fernandowestphal
Sent: Monday, August 13, 2007 2:25 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Primary-Secondary System zero flow
issue

 

Dear All,

Any news about this subject?
Is the actual version of E+ (2.0.0.025) doing the autosize for the 
primary side of primary-secondary systems?

I've tried to do it in the example file "5zoneVAV-Pri-SecLoop.idf" 
and I got chiller with zero capacity and zero flows in the primary 
loop...

Thanks!
Fernando Simon Westphal

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> , "Michael J. Witte" 
<mjwitte@...> wrote:
>
> Autosizing does not currently work for the primary loop in a 
primary-secondary 
> system. In the next release (April 2007), primary-secondary 
systems will be 
> able to be modeled using a single PLANT LOOP with no connection 
component. 
> Autosizing will then flow through to the primary side. Until then, 
you must 
> specify the primary equipment capacities and flow rates.
> 
> Mike
> 
> 
> On 16 Jan 2007 at 3:19, miaoworld wrote:
> 
> > Greetings,
> > 
> > I have a primary and secondary chilled water system, and I am 
keeping
> > having zero flow. I have specified the primary pump consumption 
and
> > flow rate for the primary chilled water loop, but the primary 
loop and
> > condenser loop (Autosized) is zero flow.
> > 
> > Any suggestions will be appreciated.
> > 
> > Thanks.
> > 
> > Miao(Eric)
> > 
> > ************* Beginning System Sizing Calculations
> > ** Warning ** SizeCondDemandSide: Calculated Plant Sizing 
Design
> > Volume Flow Rate=[0.00] is too small. Set to 0.0
> > ** ~~~ ** ..occurs for Condenser Loop=CHILLED WATER LOOP
> > CONDENSER WATER LOOP
> > ** Warning ** SizeCondSupplySide: Calculated Plant Sizing 
Design
> > Volume Flow Rate=[0.00] is too small. Set to 0.0
> > ** ~~~ ** ..occurs for Condenser Loop=CHILLED WATER LOOP
> > CONDENSER WATER LOOP
> > ** Warning ** SizePump: Calculated Pump Nominal Volume Flow
> > Rate=[0.00] is too small. Set to 0.0
> > ** ~~~ ** ..occurs for Pump=CHILLED WATER LOOP CNDW SUPPLY 
PUMP
> > 
> > 
> > ******Component sizing
> > 
> > Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference 
Evaporator
> > Volumetric Water Flow Rate [m3/s], 0.0000 
> > Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference 
Capacity
> > [W], 0.0000 
> > Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference 
Condenser
> > Volumetric Water Flow Rate [m3/s], 0.0000 
> > Component Sizing, PUMP:CONSTANT SPEED, HOT WATER LOOP HW SUPPLY 
PUMP,
> > Rated Volumetric Flow Rate [m3/s], 0.55510E-01
> > Component Sizing, PUMP:CONSTANT SPEED, HOT WATER LOOP HW SUPPLY 
PUMP,
> > Rated Power Consumption [W], 14182. 
> > Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CHW SEC
> > SUPPLY PUMP, Rated Power Consumption [W], 158.35 
> > Component Sizing, CONDENSER LOOP, CHILLED WATER LOOP CONDENSER 
WATER
> > LOOP, Volume of the condenser loop [m3], 0.0000 
> > Component Sizing, CONDENSER LOOP, CHILLED WATER LOOP CONDENSER 
WATER
> > LOOP, Maximum Loop Volumetric Flow Rate [m3/s], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, 
Autosized
> > design water flow rate [m3/s], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Fan 
power
> > at design air flow rate [W], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Design 
air
> > flow rate [m3/s], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, 
Autosized
> > tower UA value at the design air flow rate [W/C], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Air 
flow
> > rate in free convection regime [m3/s], 0.0000 
> > Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Tower 
UA
> > value in free convection regime [W/C], 0.0000 
> > Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CNDW 
SUPPLY
> > PUMP, Rated Volumetric Flow Rate [m3/s], 0.0000 
> > Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CNDW 
SUPPLY
> > PUMP, Rated Power Consumption [W], 0.0000 
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov <http://www.energyplus.gov> 
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
<http://groups.yahoo.com/group/EnergyPlus_Support/> 
> > 
> > Attachments are not allowed -- please post any files to the 
appropriate folder in the Files area of the Support Web Site.
> > 
> > EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf 
and press the "search" button.
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support 
> EnergyPlus-Support@...
>

 

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