[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Model a Chiller:Electric or Chiller:Electric:EIR

Thanks,I have followed your hints.
This is the chiller that I have modeled now for the water cooled chiller:

Chiller:Electric:EIR,
    Chiller,                 !- Name
    80000,                   !- Reference Capacity {W}
    4.1,                     !- Reference COP {W/W}
    7,                       !- Reference Leaving Chilled Water Temperature {C}
    30,                      !- Reference Entering Condenser Fluid
Temperature {C}
    3.81,                    !- Reference Chilled Water Flow Rate {m3/s}
    4.71,                    !- Reference Condenser Fluid Flow Rate {m3/s}
    Chiller 30RW 080,        !- Cooling Capacity Function of
Temperature Curve Name
    Chiller CentEIRFT,       !- Electric Input to Cooling Output Ratio
Function of Temperature Curve Name
    Chiller CentEIRFPLR,     !- Electric Input to Cooling Output Ratio
Function of Part Load Ratio Curve Name
    0.1,                     !- Minimum Part Load Ratio
    1,                       !- Maximum Part Load Ratio
    1,                       !- Optimum Part Load Ratio
    0.2,                     !- Minimum Unloading Ratio
    Chiller ChW Inlet,       !- Chilled Water Inlet Node Name
    Chiller ChW Outlet,      !- Chilled Water Outlet Node Name
    Chiller Cnd Inlet,       !- Condenser Inlet Node Name
    Chiller Cnd Outlet,      !- Condenser Outlet Node Name
    WaterCooled,             !- Condenser Type
    ,                        !- Condenser Fan Power Ratio {W/W}
    1,                       !- Compressor Motor Efficiency
    4,                       !- Leaving Chilled Water Lower
Temperature Limit {C}
    ConstantFlow,            !- Chiller Flow Mode
    ,                        !- Design Heat Recovery Water Flow Rate {m3/s}
    ,                        !- Heat Recovery Inlet Node Name
    ,                        !- Heat Recovery Outlet Node Name
    1,                       !- Sizing Factor
    ,                        !- Basin Heater Capacity {W/K}
    2;                       !- Basin Heater Setpoint Temperature {C}

Chiller 30RW 080 is the curve that I fitted with the values from the provider.
The other two curves are from the default Chiller:Electric:EIR.

Now the chiller Energy Consumption is higher than the older
Chiller:Electric Model.
This was the older chiller:

Chiller:Electric,
    Chiller,                 !- Name
    WaterCooled,             !- Condenser Type
    80000,                !- Nominal Capacity {W}
    4.1,                     !- Nominal COP
    Chiller ChW Inlet,       !- Chilled Water Inlet Node Name
    Chiller ChW Outlet,      !- Chilled Water Outlet Node Name
    Chiller Cnd Inlet,       !- Condenser Inlet Node Name
    Chiller Cnd Outlet,      !- Condenser Outlet Node Name
    0.1,                     !- Minimum Part Load Ratio
    1.0,                     !- Maximum Part Load Ratio
    1,                    !- Optimum Part Load Ratio
    30,                      !- Design Condenser Inlet Temperature {C}
    2.682759,                !- Temperature Rise Coefficient
    6.667,                   !- Design Chilled Water Outlet Temperature {C}
    autosize,                !- Design Chilled Water Flow Rate {m3/s}
    autosize,                !- Design Condenser Fluid Flow Rate {m3/s}
    0.94483600,              !- Coefficient 1 of Capacity Ratio Curve
    -.05700880,              !- Coefficient 2 of Capacity Ratio Curve
    -.00185486,              !- Coefficient 3 of Capacity Ratio Curve
    1.907846,                !- Coefficient 1 of Power Ratio Curve
    -1.20498700,             !- Coefficient 2 of Power Ratio Curve
    0.26346230,              !- Coefficient 3 of Power Ratio Curve
    0.03303,                 !- Coefficient 1 of Full Load Ratio Curve
    0.6852,                  !- Coefficient 2 of Full Load Ratio Curve
    0.2818,                  !- Coefficient 3 of Full Load Ratio Curve
    4,                       !- Chilled Water Outlet Temperature Lower Limit {C}
    VariableFlow;            !- Chiller Flow Mode

I've noticed that the highest consumption growth is when the chiller
is working with partial load,up twice consumption from
November-February.After this period the consumption is higher but it
tends to decrease the difference...

Do you think the new model is very near to the real chiller?

Thanks,
Ignacio Gomis
P.S.:I will attach the spreadshet file too
P.S.2:Remember that my weather is very warm,the builiding is located
in Malaga(Spain)


------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/


Content-Type: application/vnd.ms-excel; name="Cooling Capacity.xls"
Content-Disposition: attachment; filename="Cooling Capacity.xls"
X-Attachment-Id: f_gvl9rbtq0

Attachment not found:
d:\eudora\attach\Cooling Capacity.xls