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RE: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water

To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: RE: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
From: "Griffith, Brent" <brent_griffith@xxxxxxxx>
Date: Wed, 8 Feb 2006 14:22:43 -0700
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Thread-topic: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water
I think you are in uncharted territory.  Sorry, I don't know the answers to all of your questions and can't really take the time to really dive into it.  
 
I would be more comfortable with the water heaters in series.   I happen to be working on a tempering valve for the next release that will allow limiting the temperature into the main HP with a diversion bypass (but you won't have that until April). 

 -----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer Morrissey
Sent: Wednesday, February 08, 2006 6:14 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Open Source Heatpump with preheat inlet water



Hi Brent,

Is it possible to set up the loop like below (or am I on unchartered
ground)? The reason for my confusion is that the Water Heater#1 and
Water Heater#2 both provide the water for the main HP but the naming
convention below would suggest that the DHW is providing water for the
water heaters and the heat pump. Also, am I allowed put the main
object (Heat Pump) after a slitter and mixer that would preheat the
inlet water or should I locate these objects in the Demand side of the
circuit? 

                            
------------------x----DHW------x------------------------
|                                          |
|                                                   |
|                  Demand                          |
X                                          x

X                  Supply                        x
|                                          |
|                                           (pump)
|                                          |
|                    x---(Water Heater#1)---x      |
|                                             |
---x---(Main HP)--x    x---(Water Heater#2)---x     x---

                     x-----------------------x

Additionally; I need to limit the temperature of inlet water to the
main HP to  <25C. What objects can I use to emulate this kind of
control (DHW will provide 11C and the two water heaters will raise the
temp to a mixed input of water to the Main HP to somewhere in the
region of 15C-25C)?

Thanks again

-Elmer


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent"
<brent_griffith@...> wrote:
>
> 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
> > >
> > 
> > 
> > 
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> > 
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> > 
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> > 
> > 
> > 
> > 
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