Hello EnergyPlus Community,
I am interested to simulate a very simple water tank. The task of the tank is just to store the water, with no heater_fuel_type at all. It should be just a simple piece of metals to accumulate the water and serves the SHW or space heating when is needed. Let's say a buffer water tank.
I understood that there are some objects in EnergyPlus like WaterHeater:Mixed with the characteristics as below:
WaterHeater:Mixed,
Big Water Heater, !- Name
0.151, !- Tank Volume {m3}
Hot Water Setpoint Temperature Schedule, !- Setpoint Temperature Schedule Name
5.0, !- Deadband Temperature Difference {deltaC}
82.2222, !- Maximum Temperature Limit {C}
CYCLE, !- Heater Control Type
20000, !- Heater Maximum Capacity {W}
, !- Heater Minimum Capacity {W}
, !- Heater Ignition Minimum Flow Rate {m3/s}
, !- Heater Ignition Delay {s}
, !- Heater Fuel Type
, !- Heater Thermal Efficiency
, !- Part Load Factor Curve Name
, !- Off Cycle Parasitic Fuel Consumption Rate {W}
, !- Off Cycle Parasitic Fuel Type
, !- Off Cycle Parasitic Heat Fraction to Tank
, !- On Cycle Parasitic Fuel Consumption Rate {W}
, !- On Cycle Parasitic Fuel Type
, !- On Cycle Parasitic Heat Fraction to Tank
SCHEDULE, !- Ambient Temperature Indicator
Hot Water Ambient Temperature Schedule, !- Ambient Temperature Schedule Name
, !- Ambient Temperature Zone Name
, !- Ambient Temperature Outdoor Air Node Name
5.0, !- Off Cycle Loss Coefficient to Ambient Temperature {W/K}
, !- Off Cycle Loss Fraction to Zone
5.0, !- On Cycle Loss Coefficient to Ambient Temperature {W/K}
, !- On Cycle Loss Fraction to Zone
, !- Peak Use Flow Rate {m3/s}
, !- Use Flow Rate Fraction Schedule Name
, !- Cold Water Supply Temperature Schedule Name
Big Water Heater Use Side Inlet Node, !- Use Side Inlet Node Name
Big Water Heater Use Side Outlet Node, !- Use Side Outlet Node Name
1.0, !- Use Side Effectiveness
Big Water Heater Source Side Inlet Node, !- Source Side Inlet Node Name
Big Water Heater Source Side Outlet Node, !- Source Side Outlet Node Name
1.0, !- Source Side Effectiveness
0.005, !- Use Side Design Flow Rate {m3/s}
0.006; !- Source Side Design Flow Rate {m3/s}
I make the field for the Heater Fuel Type and Heater Thermal Efficiency empty, however, it complains and will not run. The error results are as below:
`Program Version,EnergyPlus, Version 23.2.0-7636e6b3e9, YMD=2024.10.15 10:14, * Severe * <root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_fuel_type'. * Severe * <root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_thermal_efficiency'. * Warning * Version: in IDF="24.1" not the same as expected="23.2" * Fatal * Errors occurred on processing input file. Preceding condition(s) cause termination. ...Summary of Errors that led to program termination: ..... Reference severe error count=2 ..... Last severe error=<root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_thermal_efficiency'. *** Warning: Node connection errors not checked - most system input has not been read (see previous warning). *** Fatal error -- final processing. Program exited before simulations began. See previous error messages. *** EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors. *** EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors. *** EnergyPlus Terminated--Fatal Error Detected. 1 Warning; 2 Severe Errors; Elapsed Time=00hr 00min 0.11sec
Runtime error (PythonException): * Fatal * Errors occurred on processing input file. Preceding condition(s) cause termination.
Traceback: line 94, in run_idf_and_report_errors, "<string>" line 200, in run_function_in_parallel, "C:\Program Files\ladybug_tools\python\Lib\site-packages\ladybug_rhino\grasshopper.py" line 133, in script `
Would you kindly let me know how I can simulate such a simple accumulation buffer water tank in EnergyPlus?
Thanks very much in advance.
Sincerely, Behnam
