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RE: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
Hi,
It isn't clear if/how you want to be able model (1) and (2). In theory EnergyPlus can do much of this, have you tried and run into problems?
If you can put together flow rate and temperature schedules for the conditioned aquifer water entering the heat pump, then you can get these water conditions running in a plant loop using DOMESTIC HOT WATER and Water Mains Temperatures objects. Here are a set of objects for a plant that I recently used in a test harness file for some CHP modeling that emulates an open plant loop where the recovered heat is dumped down the drain (not recommended!). (Note that you'll have to add a splitter/mixer to one side of the plant loop to run in current release EnergyPlus but hopefully this will give you some ideas.)
Brent
Water Mains Temperatures,
Schedule, ! Calculation Method
HOT WATER SETPOINTs Annex42 Series 600, ! schedule
, !Annual Average Outdoor Air Temperature
; !Maximum Difference in Monthly Average
SCHEDULE:COMPACT,
HOT WATER SETPOINTs Annex42 Series 600, !- Name
Temperature, !- ScheduleType
THROUGH: 12/31, !- Complex Field #1
FOR: AllDays, !- Complex Field #2
UNTIL: 8:00, 50.0,
UNTIL: 16:00, 30.0,
UNTIL: 24:00, 10.0;
PLANT LOOP,
Heat Recovery Water Loop,!- Plant Loop Name
Water, !- Fluid Type
Recovery Loop Operation, !- Plant Operation Scheme List Name
Heat Recovery Supply Outlet Node, !- Loop Temperature Setpoint Node Name
98, !- Maximum Loop Temperature {C}
10, !- Minimum Loop Temperature {C}
1.01123E-05, !- Maximum Loop Volumetric Flow Rate {m3/s}
0.00, !- Minimum Loop Volumetric Flow Rate {m3/s}
autosize, !- volume of the plant loop {m3}
Heat Recovery Supply Inlet Node, !- Plant Side Inlet Node Name
Heat Recovery Supply Outlet Node, !- Plant Side Outlet Node Name
Heat Recovery Supply Side Branches, !- Plant Side Branch List Name
, !- Plant Side Connector List Name
Heat Recovery Demand Inlet Node, !- Demand Side Inlet Node Name
Heat Recovery Demand Outlet Node, !- Demand Side Outlet Nodes Name
Heat Recovery Demand Side Branches, !- Demand Side Branch List Name
, !- Demand Side Connector List Name
Optimal, !- Load Distribution Scheme
Always_ON;
PLANT OPERATION SCHEMES,
Recovery Loop Operation, !- PlantOperationSchemeName
Uncontrolled Loop Operation , !- KEY--Control Scheme 1
SOFC CHP , !- Control Scheme Name 1
Always_ON; !- Control Scheme Schedule 1
Uncontrolled Loop Operation,
SOFC CHP ,
CHP plant;
PLANT EQUIPMENT LIST,
CHP plant, !- Equip List Name
PUMP:Constant SPEED,
Heat Recovery Circ Pump;
SET POINT MANAGER:SCHEDULED,
Heat Recovery Water Loop Setpoint Manager, !- Name
TEMP, !- Control variable
HOT WATER SETPOINTs Annex42 Series 600, !- Schedule Name
Heat Recovery Water Loop Setpoint Node List; !- Name of the set point Node or Node List
NODE LIST,
Heat Recovery Water Loop Setpoint Node List, !- Node List Name
Heat Recovery Supply Outlet Node; !- Node_ID_1
BRANCH LIST,
Heat Recovery Supply Side Branches, !- Branch List Name
Heat Recovery Supply Branch; !- Branch Name 1
BRANCH,
Heat Recovery Supply Branch, !- Branch Name
1.01123E-05, !- Maximum Branch Flow Rate {m3/s}
PUMP:Constant SPEED, !- Comp1 Type
Heat Recovery Circ Pump, !- Comp1 Name
Heat Recovery Supply Inlet Node, !- Comp1 Inlet Node Name
Small SOFC Heat Rec Inlet Node, !- Comp1 Outlet Node Name
ACTIVE, !- Comp1 Branch Control Type
GENERATOR:FC:EXHAUST GAS TO WATER HEAT EXCHANGER, !- Comp2 Type
Fictitious SOFC Exhaust HX, !- Comp2 Name
Small SOFC Heat Rec Inlet Node, !- Comp2 Inlet Node Name
Small SOFC Heat Rec Outlet Node, !- Comp2 Outlet Node Name
PASSIVE, !- Comp2 Branch Control Type
PIPE, !- Comp3 Type
Heat Recovery Supply Outlet, !- Comp3 Name
Small SOFC Heat Rec Outlet Node, !- Comp3 Inlet Node Name
Heat Recovery Supply Outlet Node, !- Comp3 Outlet Node Name
PASSIVE; !- Comp3 Branch Control Type
PUMP:Constant SPEED,
Heat Recovery Circ Pump, !- Pump Name
Heat Recovery Supply Inlet Node, !- Inlet_Node
Small SOFC Heat Rec Inlet Node, !- Outlet_Node
1.00E-05, !- Rated Volumetric Flow Rate {m3/s}
50000, !- Rated Pump Head {Pa}
0.0, !- Rated Power Consumption {W}
.87, !- Motor Efficiency
0.0, !- Fraction of Motor Inefficiencies to Fluid Stream
Continuous, !- Pump Control Type
Annex 42 test 600 flow schedule; !Pump Flow Rate Schedule.
PIPE,
Heat Recovery Supply Outlet, !- PipeName
Small SOFC Heat Rec Outlet Node, !- Inlet Node Name
Heat Recovery Supply Outlet Node; !- Outlet Node Name
!Demand side
BRANCH LIST,
Heat Recovery Demand Side Branches, !- Branch List Name
Heat Recovery Demand Branch; !- Branch Name 1
BRANCH,
Heat Recovery Demand Branch, !- Branch Name
1.01123E-05, !- Maximum Branch Flow Rate {m3/s}
PIPE, !- Comp1 Type
Heat Recovery Inlet Pipe,!- Comp1 Name
Heat Recovery Demand Inlet Node, !- Comp1 Inlet Node Name
Heat Recovery Demand Drain Node, !- Comp1 Outlet Node Name
PASSIVE, !- Comp1 Branch Control Type
DOMESTIC HOT WATER, !- Comp1 Type
Heat Recovery Drain, !- Comp1 Name
Heat Recovery Demand Drain Node, !- Comp1 Inlet Node Name
Heat Recovery Demand Outlet Node, !- Comp1 Outlet Node Name
ACTIVE; !- Comp1 Branch Control Type
PIPE,
Heat Recovery Inlet Pipe,!- PipeName
Heat Recovery Demand Inlet Node, !- Inlet Node Name
Heat Recovery Demand Drain Node; !- Outlet Node Name
DOMESTIC HOT WATER,
Heat Recovery Drain,
Heat Recovery Demand Drain Node, !- Inlet Node Name
Heat Recovery Demand Outlet Node, !- Outlet Node Name
1.0000E-05, !- Peak Volumetric Flow Rate {m3/s}
Annex 42 test 600 flow schedule, !Pump Flow Rate Schedule.
; ! default to water mains temperatures
SCHEDULE:COMPACT,
Annex 42 test 600 flow schedule, !- Name
Fraction, !- ScheduleType
THROUGH: 12/31,
FOR: AllDays,
UNTIL: 9:00, 1.0, ! 0.01 kg/s until 9:00
UNTIL: 24:00, 0.277; ! 0.0028 kg/s until 24:00
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer Morrissey
Sent: Friday, February 03, 2006 7:18 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
Can anyone help... this is still unresolved?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elmer Morrissey"
<elmofuddly@...> wrote:
>
> Hello all,
>
> Is there any way to emulate an open source heat pump in E+?
>
> The system takes water from a local aquifer. Some of this water is
pre
> heated with two heat exchangers ((1) a `dump' from a solar circuit
> network and (2) a `dump' from a refrigeration circuit). Then this
> water is fed into the heat pump which provides low temperature hot
> water for heating the building.
>
> I would appreciate any help. The exact objects don't have to be
heat
> pumps/heat exchangers... I just need to emulate performance.
>
> Kind regards
>
> -Elmer
>
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