Econet Heat Recovery Slides

8/3/2019 Econet Heat Recovery Slides

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ECONET where renewableand recoverable energy unite


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ECONET where renewableand recoverable energy unite


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Energy exchangers

Energy recovery systems are very

common in current building designs

There are 3 common energy recoverysystems on the market.

1. The rotary heat exchanger (RHE)

2. The plate heat exchanger (PHE)

3. The run around coils (RAC)

ECONET


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Energy exchangers

There are a number of things to be considered when selecting an energy

recovery system:

Energy recovery efficiency combined with the pressure drop

Space in the equipment room

Location of air handling units

The duct connection

Leakage and odor transfer (cross-contamination in the recovery system)

Activity conducted in the building

Need for latent cooling recovery

Types of energy sources

ECONET


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Energy sources:

Limited traditional energy sources(oil, gas, coal etc.)

Increase of energy consumptionon a global scale

Increase in energy prices

The Environment:

Global warming, CO2

Emissions, pollution

Legislation: Global and regional regulations/

restrictions

Pasterze Glacier, 1875

Pasterze Glacier, 2004

Why should we reduce the energy consumption ?

ECONET


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What to optimize inside current AHUs?

There are a lot of

components to beoptimized in an AHU:

Recovery device

Fans

Motors

Frequency inverters Pressure drop thru

components

Velocity

Size

External issues Etc.

Exhaustair

Supply air

Extract air

Outdoorair

+

LWA extract

qextract

LWA supply

qsupply

pext in poutl pext outlp4 p inlp1 p2 p3

rotor drive motor trans fan

PmainLWA amb

pfan

Exhaustair

Supply air

Extract air

Outdoorair

+

LWA extract

qextract

LWA supply

qsupply

pext in poutl pext outlp4 p inlp1 p2 p3

rotor drive motor trans fan

PmainLWA amb

pfanpfan

ECONET


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The run around coil system


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Run Around Coils

Run around coils (RAC) are one of

the 3 most common types of energyrecovery systems. The traditionalRAC is a well known system and ithas been used for decades.

ECONET is an advanced form ofrun around coil and was introducedby Flkt Woods in 2000.

ECONET


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Run around coils: Advantages

No risk of cross-contamination

Flexible installation, supply air andexhaust air units can be separated.

Can be used for applications withcorrosive and polluted exhaust air.

Moderate/good energy recoveryefficiency

Easy to optimize recovery withunbalanced air flows

ECONET


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Run around coils: Disadvantages

More complex installation

Maintenance of the liquid/recovery circuit

No latent cooling recovery

Normally moderate energy recoveryefficiency

ECONET


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Advantages: No risk of cross-contamination Flexible installation, supply air and exhaust air units can be separated.

Can be used for applications with corrosive and polluted exhaust air. Moderate/good energy recovery efficiency Easy to optimize recovery with unbalanced air flows

Disadvantages: More complex installation Maintenance of the liquid/recovery circuit No latent cooling recovery Moderate energy recovery efficiency

Applications:

Due to a flexible solution combined with a mod/good recovery efficiency, the system is suited for: No leakage can be tolerated. The supply and the exhaust air units have to be separated from each other. Relatively simple to install it in existing AHUs (upgrading of the functionality) Hygiene applications Applications with corrosive or polluted exhaust air No need of moisture recovery

ECONET: Where process or waste heat available

Limited space in the equipment room High recovery efficiency

Commercial buildings Hospital, hygiene applications Pharmaceutical applications Housing, depending on the market

Run around coils: Summary

ECONET


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The unique advantages ofthe ECONETsystem.


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Unique advatages of ECONET

1 component, 4 functions:

Heat recovery Additional heating

Cooling recovery

Additional cooling

Lower pressure drops

Shorter AHU

Fewer components

ECONET


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Unique advatages of ECONET

Increased heat recovery efficiency

6075% performance

Able to use cooling recovery

Always prepared for cooling andcooling recovery

Possibility to utilize process/ wasteheat

Perfect for district cooling/heating

Pre-fabricated pump unit

ECONET


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The delivery


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ECONET : Basics, coils

Consists of heat exchangers (coils) in the

supply air and in the exhaust air. The coils are composed of copper pipes

with profiled aluminum or copper fins. Thefin pitch is 2-4 mm.

For highly corrosive environment the fins

are either epoxy coated or of stainlesssteel.

Both coils are equipped with drip trays.

For high air velocities, coil are equipped

with droplet eliminators.

Several capacity variants of the coilsavailable for each AHU size (2 to 12 rows)

ECONET


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ECONET : Basics, pump unit and controls

ECONET

ECONET pump units are available in 2 versions:

ECONET standard

ECONET compact

Common for both versions:

Pump unit for energy recovery/heating and

cooling

Pipe work, anti-rust painted and insulated

Controls for energy recovery function

Frequency inverter for pump

All required sensors mounted and cabled

A floor-mounted stand for all pump unit sizes


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ECONET pump units are available in 2

versions:

The main difference between theversions:

ECONET standard

Equipped with a separate controllerfor optimization of energy recovery.Controls with additional functions.

ECONET compact

Equipped with a multifunctional

frequency inverter, with integratedcontrols for optimization of energyrecovery. Limited additional functions.

ECONET


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ECONET pump units are available in 2

versions:

Which version to choose?

Choose ECONET standard if:

Dry-box solution

Twin pump solution Efficiency calculation

Energy calculation

Lon and BacNet

Otherwise choose ECONET compact:

A compact and a more cost efficientsolution

ECONET


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ECONET Exchanger package

A pre-fabricated exchanger package

(accessory), consisting of:

Plate heat exchanger for additionalheating.

Plate cooling exchanger foradditional cooling.

Shut off valves. Drain valve, filling valve.

A stand for the exchanger packagedesigned to stand on the floor.

Expansion vessel with safety valve.

It is possible to order an integratedsystem, including both the pump unitand the exchanger package.

ECONET


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The function of ECONET


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Control box, ECONET Control box, AHU/BMS

Energy recovery

Safety functions

start/stopheat recovery 0-10 V

cooling recovery on/offcooling function on/off

A-Alarm on/off -->3 x temp 0-10V -->

Option:

Temp. efficiency 0-10V -->

B-Alarm for twin pump -->

Control of supply air temp.:heating/cooling valves etc...

Other AHU functions

ECONET: Function, controls

ECONET


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ECONET: Function, heat recovery + heating

Mode 1, a cold winter day

Heat recovery + additional heating:

The system optimizes the heatrecovery by controlling the liquid flow.

Additional heating, controlled by the

heating valve. Internal frost and ice protection

Control signals:

Heat recovery signal 100% (10V)

BMS controls the heating valve 100%

HRC

Supply air

Exhaust air

70%

73

30%

10 68

80

ECONET


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ECONET: Function, heat recovery

Mode 2, a normal winter day.

Only heat recovery, no need of additionalheating:

The system optimizes the heatrecovery by controlling the liquid flow.

Control signals:

Heat recovery signal 100%

100%

HRC

Supply air

Exhaust air

100%

73

41 62

66

ECONET


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ECONET: Function, reduced heat recovery

Mode 3, a spring/autumn day.

Only heat recovery, reduced heatrecovery:

The system is too efficient andreduces the heat recovery by

reducing the liquid flow.

Control signals:

Heat recovery signal 0%< sign


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ECONET: Function, no recovery

Mode 4, changing from winter to

summer.

No need for heating or cooling ofsupply air:

The pump stops

Control signals:

Heat recovery signal 0% (0V)

Supply air

Exhaust air

62 62

ECONET


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ECONET: Function, cooling, no recovery

Mode 5; a normal summer day

Additional cooling:

No cooling recovery, due to the airtemperatures.

The system optimizes the liquid flow

for additional cooling. Additional cooling, controlled by the

cooling valve.

Control signals:

Cooling signal on Heat recovery signal 0%

BMS controls the cooling controlvalve

onCooling

Supply air

Exhaust air

100%

68 60

55

75

ECONET


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ECONET: Function, cooling recovery + cooling

Mode 6, a hot summer day

Additional cooling + cooling recovery:

The system optimizes the coolingrecovery by controlling the liquid flow.

Additional cooling, controlled by the

cooling valve.

Control signals:

Cooling signal on

Cooling recovery signal on

Heat recovery signal 0% BMS controls the cooling valve

onCooling

rec.

Supply air

Exhaust air

25%

75

75%

89 60

51

ECONET


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ECONET: Function, cooling recovery (IEC) + cooling

Mode 6 optional, an even hotter summer

day with the additional function, IEC

IEC = indirect evaporative cooling

Additional cooling + cooling recovery(IEC):

The same principles as normalcooling recovery, but by using ahumidifier in the exhaust air. Thecooling power can be reduced evenmore.

Normal cooling power reduction: 25%

IEC cooling power reduction: 45%

More on this in a later sectionon

Coolingrec.

Supply air

89 60

51

Exhaust air45%

66 75

55%

ECONET


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Energy sources for theECONETsystem.


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ECONET: Heating energy sources

What is Acceptable?

Traditional energy sources, gas, oil,electricity, pellets, etc.

What is Optimal?

ECONETcan utilize warm water

(energy) from 77-86.

Waste heat (condensate heat) fromchillers

Waste heat from industrial processes

Heat pumps District heating

Return water from district heating

Supply air

Exhaust air

70%

73

30%

10 68

80

ECONET


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ECONET: Cooling energy sources

What is Acceptable?

A traditional chiller.

What is Optimal?ECONETcan utilize cold water

(energy) of up to 50-53.

Cooling energy from soil or sea(geothermal)

Optimized chiller

District cooling

IEC, indirect evaporative coolingSupply air

89 60

51

Exhaust air 45%

66 75

55%

ECONET


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What does IEC mean ?

To clarify the function of Indirect

evaporative cooling (IEC)

IEC is a way of getting more coolingrecovery from the exhaust air.

The idea is to humidify the exhaust airwith water. The water evaporates anddecreases the air temperature and thecooling recovery becomes even moreeffective.

Thanks to the recovery system (RAC)there is no risk of cross contamination

between the air streams which avoidsthe risk of getting humid air back intothe supply air.

Supply air

89 60

51

Exhaust air 45%

66 75

55%

ECONET


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What are the benefits of IEC ?

It is a good system for applications

where it is of importance to cut of thepeak loads from the chiller. In thiscase the chiller size can be reducedby approx. 45%.

For markets with warmer climates it

reduces the additional cooling energyas well.

Supply air

89 60

51

Exhaust air 45%

66 75

55%

ECONET


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The impact on the cooling network

Two cooling examples, one with

additional cooling combined with coolingrecovery the other one with coolingrecovery with IEC.

Cooling with ECONET has followingbenefits:

Reduced size of chiller

Reduced liquid flow and pipe work

A higher evaporating temperature inthe chiller gives us a smaller and amore efficient chiller

71F

78F

Supply air

89 60

51

Exhaust air 45%

66 75

55%

Supply air

Exhaust air

25%

75

75%

89 60

51

ECONET


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The impact on the cooling network, power

Reduced size of chiller due to cooling recovery

Reduced liquid flow and pipe work

Smaller and a more efficient chillerSupply air

32C 16C

11C

Exhaust air 45%

19C 24C

55%

Supply air

Exhaust air

25%

24C

75%

32C 16C

11C

Traditional

No cooling recovery

ECONET+IEC

ECONET

Chiller

55%

75%

100%

ECONET


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The impact on the cooling network, cold water flow

Reduced size of chiller Reduced liquid flow and pipe work

due to hight

Smaller and a more efficient chillerSupply air

32C 16C

11C

Exhaust air 45%

19C 24C

55%

Supply air

Exhaust air

25%

24C

75%

32C 16C

11C

Traditional

No cooling recovery

ECONET+IEC

ECONET

Chiller

30% (50/68)

30% (50/75)

100% (42/53)

ECONET


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The impact on the cooling network, temperatures

Reduced size of chiller Reduced liquid flow and pipe work

Smaller and more efficient chiller

due to a higher evaporatingtemperature.

Supply air

32C 16C

11C

Exhaust air 45%

19C 24C

55%

Supply air

Exhaust air

25%

24C

75%

32C 16C

11C

Traditional

No cooling recovery

ECONET+IEC

ECONET

Chiller

30% 50/68

30% 50/75

100% 42/53

ECONET


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ECONETcan protect yoursupply air filter as well


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ECONET: Special protection of the supply air filter

Basics:

In some regions, there is a need toprotect the supply air filter.Otherwise the high humidity undercertain outdoor air conditions maydamage the filter.

To protect the filter a pre-heater isinstalled before the filter, heating theoutdoor air for approx 35 F

The negative aspect of a traditionalpre-heater is that the systemdestroys the heat recovery.

ECONET


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ECONET: Special protection of the supply air filter

Solution:

The preferred solution is to use a pre-heater combined in the heat recoverycircuit.

This has following benefits: Heat recovery efficiency is

maintained

No primary heat connections tothe pre-heater

No risk of frozen pre-heater coils

ECONET


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ECONET: Dry box solution, summary

A system for protection of the supplyair filter

Advantages: Savings in heating energy

consumption due to a more efficientsystem

Savings in fan energy consumption,

due to fewer/thinner coils (not asdeep)

Savings in plumbing, due to noprimary heating connections to thepre-heater

Savings in controls, due to no

separate controls of the pre heater.

Safer system due to no hot watercoils in the supply air.

ECONET


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Benefits with ECONET


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ECONET: Saves space in the equipment room

1 coil in the supply air instead of 3 coils

(recovery + heating + cooling). Reduction of the AHU length:

By 3 6

Reduction of the AHU foot-print

Reduction of the AHU weight:

By 800 - 1,000 lbs.

Summary

More space to rent

Easier to install the units

Easier maintenance Possibility to use bigger AHUs

More air, better efficiency, etc.

+ 48

ECONET


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ECONET: Reduces installation time

A pre-fabricated pump unit with

integrated controls for energyrecovery, including all necessarysensors, naturally reduces theinstallation time and the potential formistakes on site.

ECONET


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ECONET: Applications

Everywhere, where there is a need

for a run around coil solution,including particularly Hygiene

applications.

Everywhere, where waste heat is

available.

Everywhere, where there is a desireto optimize the cooling system.

Everywhere, where plant room spaceis restricted.

Everywhere, where there is a need toprotect the supply air filter.

ECONET


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Controls: Assembly andinstallation


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Standard:

Power supply to the ECONETcontroller

Power supply to the frequencyinverter/inverters

Supply air flow transmitter Assembly of the transmitter Wiring between the transmitter

and the ECONET control box

Wiring between the ECONET and

the BMS system

Or/and network communicationModbus, Lon

Automation and electricity on site

GT

41

GT

40

GP

40

GT

42

GP

41

GF

10

AI

AO

DI

DO

AI

AO

DI

DO

Alarm

Start

Cooling

Cooling recovery

Heat recovery

A Alarm

Temp GT40

Temp. GT41

Temp GT42

Optional:

ECONET

AHU/BMS

Wiringonsite

Wiring on site

Optional

Pump indication

SC

40

SV

40

ECONET


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Control inputs:

Start (digital on/off) Cooling start (digital on/off)

Cooling recovery start (digital on/off)

Heat recovery signal (analog 0-10V)

GF10 Air flow signal (analog 0-10V)

Automation and electricity on site, ECONET BMS

Control outputs:

A-Alarm (digital on/off) B-Alarm (option) (digital on/off)

P40 Pump indication (digital on/off)

GT41 (analog signal, 0-10 V)

GT42 (analog signal, 0-10 V) GT40 (analog signal, 0-10 V)

Network communication chosen(LON, Modbus)

All integration tasks such as

e.g. binding and activating ofthe address between theECONET controller and theBMS system.

ECONET


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Additional functions, which hasto be chosen separately:

*) Efficiency and energycalculation, wiring andassembling of additionalsensors

**) Twin pump solution

***) Network

Automation and electricity on site, ECONET BMS

Control inputs:

GT 00,10,20,21: air temperature

sensors *)

GT30, additional liquid temperaturesensor *)

GF20: air flow signal *)

Control outputs:

Efficiency (analog 0-10V) *)

B-Alarm (digital on/off) **)

Network communication (LON,Modbus) ***)

All integration tasks such ase.g. binding and activating ofthe address between theECONET controller and theBMS system.

ECONET


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Piping: Assembly andinstallation


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Standard:

Assembly of the pump unit Pipes from the exhaust air unit

to the pump unit Pipes from the exchanger

packages to the pump unit Pipes from the supply air unit

to the pump unit

Available assembly of theexchanger package

Pipes from the exchangerpackages to the pump unit

Pipes, valves on the primaryside of the exchanger package

Piping on site

ECONET


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Additional functions, which hasto be chosen separately:

If the exchanger package notdelivered by FWG

Expansion vessel

Heat exchanger

Cooling exchanger

Connection for filling

Safety valve

If dry box solution chosen

Pipes between the twosupply air coils

Piping on site

Other necessary components asset in the document, such as:

External shut-off valves

Automatic air purging valvescombined with manual airpurging valves

Air purging valve for microbubbles

Filter

Charging equipment

Water traps

Anti-freeze liquid Filling of the system

Air purging of the system

ECONET


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The most important issues to prevent leakage:

1. System filled up with right kind of glycol, Etylen glycol mixture for HVAC purpose2. Use Pre mixed liquid

3. If mixed on site, then wait at least 24 h to get rid of air in the liquid

4. Do not use the ECONET pump to fill or/and to clean the system

5. Be sure that You get rid of all flushing/cleaning liquid before filling the system

6. Dont run the pump dry (air), the pump sealing burns and get destroyed

1. Use the air purging screw on the pump to get rid of air from the pump2. Use automatic air purging valves combined with manual air purging valves3. The first weeks the manual valve open and the automatic valve working4. When the air is out then close the manual valve

7. After some time check that no air has come in to the system1. If air then open the manual air purging valve, if continuous problem, check leakage

8. Expansion vessel on the suction side of the pump, safety valve opening pressure min 3 bar

9. Use a closed liquid filling system.1. No open filling vessel, risk of bacterial growth, later on might pump in to the system

10. Check the liquid quality, colour, freezing point etc

Avoid leakage in the future: Top 10

ECONET


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Start-Up and Maintenance


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The most important checks when starting up ECONET:

1. Check all pipe connections (counter flow)

2. System filled up with right kind of glycol

3. System purged of air and has an air purging system

4. Expansion vessel on the suction side of the pump

5. Electricity connection to ECONET frequency inverter and control box6. Controls connected

7. ECONET gets the supply air flow

8. Nothing on manual drive (frequency inverter, by-pass valve)

9. Configure the ECONET controller

10. Go through the start up protocol and note if something is not perrequirements.

Start-up: Top 10

ECONET


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Liquid status Check the freezing point of the frost protection fluid. Check the system pressure and top up with ethylene glycol mixture if necessary.

Coils Check that the finned surfaces of the coils are not dirty, clean if necessary.

Water trap Check that water is present in the water trap for the exhaust air and supply air coils.

Air purging Check frequently in the beginning and after the first year. Stop the pump and wait a couple of hours to make sure that the air bubbles have risen to

the highest points in the system, open/close all valves in the system so that trapped air canbe removed.

Valve checking

Shut down the system and open/close every valve to make sure it has a smooth operation.

Pump seals Check the seals and if there is too much leakage, change the seals.

ECONETchecks

ECONET


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Efficiency calculation

Effi i l l i h


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Efficiency calculation, heat recovery

The normal way of calculating the heat

recovery efficiency is the temperatureefficiency over the supply air coil:

= (GT10-GT00)

(GT20-GT00)

Where:

GT00, air temperature, outdoor

GT10,air temperature, supply

GT20, air temperature, exhaust

GT

41

GT

40

GP

40

GT

42

GP41

GF

10

GT

10

GT

00

GT

20

GT

21GF

20

GT

30/50

SV

40

ECONET

This formula can not be used forECONET if additional energy isconnected to the system.

Effi i l l ti h t


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Efficiency calculation, heat recovery

In the formula for ECONET we have to

exclude the impact of the additional energy:

= (GT42-GT41) x (GT10-GT00)

(GT40-GT41) x (GT21-GT00)

Where:

GT00, air temperature, outdoor GT10, air temperature, supply


GT40, liquid temperature, supply in

GT41, liquid temperature, supply out

GT42, liquid temperature, exhaust out

GT

41

GT

40

GP

40

GT

42

GP41

GF

10

GT

10

GT

00

GT

20

GT

21GF

20

GT

30/50

SV

40

ECONET

Effi i l l ti li


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Efficiency calculation, cooling recovery

The normal way of calculating the

cooling recovery efficiency is thetemperature efficiency over the supplyair coil:

= (GT10-GT00)

(GT20-GT00)

Where: GT00, air temperature, outdoor

GT10, air temperature, supply


GT

41

GT

40

GP

40

GT

42

GP41

GF

10

GT

10

GT

00

GT

20

GT

21GF

20

GT

30/50

SV

40

ECONET

This formula can not be used forECONET if additional energy isconnected to the system.

Effi i l l ti li


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Efficiency calculation, cooling recovery

In the formula for ECONET we have to

calculate over the exhaust air due topossible risk of condensation of water inthe supply air coil:

= (GT21-GT20)

(GT00-GT20)

Where:

GT00, air temperature, outdoor


GT21, air temperature, extract

GT

41

GT

40

GP

40

GT

42

GP41

GF

10

GT

10

GT

00

GT

20

GT

21GF

20

GT

30/50

SV

40

ECONET

Effi i l l ti h t l l t ?


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Efficiency calculation, where to calculate ?

Calculation alternative 1:

The easiest way to calculateefficiency for an ECONET system isto do it in the BMS system

The BMS system usually have thetemperatures on the air side:GT00,10,20,21 and gets GT40,41

and GT42 from the ECONETcontroller by 0-10V signals.

Calculation alternative 2:

If temperature efficiency calculation is

chosen to be calculated by theECONET controls, then the followingsensors are included in the deliveryby the manufacturer.

GT

41

GT

40

GP

40

GT

42

GP41

GF

10

GT

10

GT

00

GT

20

GT

21GF

20

GT

30/50

SV

40

ECONET

Efficienc calc lation e al ation ?


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Efficiency calculation, evaluation ?

To be able to analyze the result, you

have to know more: Balance of air flows

Humidity in the air

And keep in mind that a calculatedefficiency only shows a trend and is notexact due to:

Tolerances of the temperaturesensors

Tolerances of the air flow sensors

Location of the sensors

A heat recovery efficiency of:

= 63.45 %

ECONET


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Applications

Application: Supermarket


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Application: Supermarket

Why ECONET?

More than 40 ECONET references inSupermarkets

Waste/Condensate heat available.

Waste heat available from thechillers, 24 hr/day.

Perfect for ECONET and most ofthe year the super market is self-supporting concerning heatingenergy.

Variation of the need of fresh air.

ECONET is suited for VAVsystem due to continuousoptimization of energy recovery.

ECONET

Application: Supermarket additional energy


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Application: Supermarket, additional energy

Piping of the energy sources:

Usually ECONET is equipped withboth heating and cooling function

Heating and cooling sources:

Heating 1: Waste heat fromchillers

Heating 2: Primary heating (forsafety if no waste heat available)

Cooling: Traditional cooling orother

ECONET

Application: University combined with geothermal


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Application: University combined with geothermal

Why ECONET ?

More than 100 ECONETUniversityreferences

Flexibility with run around coils.

Functionality of the premises mightchange.

Long running hours

Variation of the need of fresh air

Sometimes combined with otherECONET unique functions, like

thermal energy.

ECONET

Application: Soil energy geothermal


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Application: Soil energy - geothermal

Heating function, soil energy -> Heat pump 86 -> AHU

heat pump

Soil/geothermal

VAV device

ECONET

Application: Soil energy


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Application: Soil energy

Cooling function, soil energy -> (Chiller pump or/and directly 52 -> AHU)

heat pump

Soil/geothermal

VAV device

cooling water 52

ECONET


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ECONETvs. Compact

ECONET standard vs compact


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Standard Controller and frequency inverter

Framework for controller andfrequency inverter

Compact No controller, software in the frequency

inverter

Frequency inverter integrated on pump

Reduced size of pump unit

Basic functions the same

Reduced additional functionality

ECONETstandard vs. compact

ECONET

ECONETstandard vs compact


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CompactReduced additional functionality

Dry box solution

Twin pump solution

Energy calculation

Efficiency calculation

Lon

BacNet

Cleanable coils

Items listed above available forECONET standard:

Optional: Modbus

ECONETstandard vs. compact

ECONET

ECONETstandard vs compact


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Summary

A simplified ECONET (RAC) solution

Basic functionality the same (standard vs. compact)

Additional functionality limited

ECONET standard vs. compact

ECONET


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To summarize: the uniqueadvantages of theECONETsystem.

Unique advantages of ECONET


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1 component, 4 functions:

Heat recovery Additional heating

Cooling recovery

Additional cooling

Lower pressure drops

Shorter AHU

Fewer components

ECONET



79/82


Increased heat recovery efficiency6075% performance

Able to use cooling recovery

Always prepared for cooling andcooling recovery

Possibility to utilize process/ waste

heat

Perfect for district cooling/heating

Pre-fabricated pump unit

ECONET


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Econet Heat Recovery Slides

Documents