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RE: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
I would try to use WATER HEATER:MIXED objects to model heat exchange between seperate plant loops. This is a surprisingly multi-purpose model that can do everything from instantaneous water heaters to passive storage tanks. They have seperate "Source" and "Use" sides. You can set an overall heat transfer effectiveness for each side. Just use a relatively small tank volume and no heat capacity and you have a heat exchanger. This is what we use for solar collector storage.
IF you are a solid fortan90 programmer, it isn't too hard to add models to EnergyPlus. All it takes is a collaborative developer's license and a modern compiler. The fuel cell generator is actually in Version 1.2.3 but it isn't well documented, because the model is/was still evolving -- see www.cogen-sim.net.
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer Morrissey
Sent: Monday, February 06, 2006 4:55 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
Hi Brent,
I noticed that your GENERATOR:FC:EXHAUST GAS TO WATER HEAT EXCHANGER
object is not a standard object in EnergyPlus. Is it difficult to make
new objects to suit your problems in E+?
I have attempted modelling EnergyPlus' heat exchanger objects, however
you can only use it's condenser heat exchanger on a condenser loop. Is
there a simple heat exchanger object for normal plant loops?
I'm sorry if I didn't explain fully, but I want to preheat some of the
water entering the source side of the heat pump by running it through
two heat exchangers. The first heat exchanger `dumps' excess heat from
a cooling circuit. This heat exchanger maintains a 10oC temp in the
cold circuit and as a result... it preheats the aquifer water. This
aquifer water then passes through a second heat exchanger. This heat
exchanger preheats the water as the source is a solar array circuit.
The `preheated' water joins up with the rest of the aquifer water that
did not pass through the heat exchangers and finally enters the heat
pump before it is dumped out back to a nearby river.
Any thoughts regarding possibility of preheating my open source heat
pump? The DHW would seem to emulate the open source aquifer. I will
attach this to the HEATPUMP:Water to Water. It is the preheat that I
am having difficulty with. I am just unsure what objects to use and
how to dictate the control.
Kind regards
-Elmer
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent"
<brent_griffith@...> wrote:
>
> 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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