www.alfalaval.com
www.alfalaval.com
October 14th , 2020
| © Alfa Laval 2 |
Lets talk about Industrial Ammonia Heat Pumps
Superior Energy Efficiency with Alfa Laval Plate heat exchangers
26/10/2020
Heat
pump
NH3
Tommy
Angback
Sales Director
Refrigeration
at Alfa Laval
www.alfalaval.com26/10/2020 | © Alfa Laval
3 |
Low value heat sources − Reason for using Heat Pumps
Why Heat Pumps?
Industrial Heat pumps makes it possible to use waste or natural
low temperature heat for space or industrial process heating.
Typical heat sources are sea water, ground water or waste heat
from industries, refrigeration plants and data centers mainly used
for:
Industrial ProcessThey are connected to dehumidification, distillation and evaporation
processes, but also for water heating and combined heating and cooling.
District heatingHeat pumps are successfully connected to district heating systems or in
combined district heating and cooling systems.
Commercial buildingsHeat pumps are connected to water loops (hydronic) for heat and cold
distribution.
Pressure (bar)
Te
mp
era
ture
(ºC
)
Heat
pump
NH3
www.alfalaval.com26/10/2020 | © Alfa Laval 4 |
Why Ammonia− Highly efficient future proof refrigerant
100 000
10 000
1 000
100
10
10,01 0,1 1
R404
R410AR134a
Propane
CO2, Ammonia
R22
R12R113R11
GW
P*
Eq
uiv
ale
nt
Ozone Depletion Potential
R32
HFO´s
Heat
pump
NH3
• GWP=0
• ODP=0
• High volumetric capacity
• More effective and cheaper than synthetic
alternatives
• Lowest total lifetime cost
• Known for centuries as a refrigerant and will stay
Remember
• Classified as Fluid Group 1 in PED (toxic, corrosive,
and moderately flammable), so special legal
requirements may apply
• No ATEX requirements for normal ammonia plants
except for machine-room ventilation in special
cases
• Copper and its alloys are not allowed as material
• Oil draining required
www.alfalaval.com26/10/2020 | © Alfa Laval 5 |
Industrial Heat Pump-example of application− Recovering waste heat from a datacentre feeding a district heating network
While being cooled, a
data centre serves as
low temperature ~30 °C
heat source for an
industrial ammonia
heat pump
Heat pumps/s
Supply @ 60-90 °C
Return @ ~35 °C
Heat
pump
NH3
www.alfalaval.comwww.alfalaval.com26/10/2020 | © Alfa Laval 6 |
Heat Pump Impact – How Alfa Laval semi
welded plate heat exchanger increases the
COP
www.alfalaval.com
Efficiency (COP) of the Heatpump
26/10/2020 | © Alfa Laval 7 |
Flooded ammonia evaporator
Condenser
Ammonia Separator
Valve
Compressor
Heat source -
low value heat Heating
supply
Heat
pump
NH3
Efficiency of the heat pump = COP
Coefficient of performance
COP = Heat Energy supplied (kW)
Electricity Power Consumed (kW)
Electricity
www.alfalaval.com
In general it is possible to obtain 2K
closer approach than with other heat
exchanger technologies at comparable
size and cost
− every K higher Tevap (evaporation
temperature) saves 3-6% of the heat
pump power consumption.
− Plate Heat exchangers Enables higher energy efficiency
Flooded Ammonia Evaporator
26/10/2020 | © Alfa Laval 8 |
DtTevap
possible to raise
the evaporation
temperature
T
Heat Exchanger
Inlet
Heat Exchanger
Outlet
T
Heat
pump
NH3
www.alfalaval.com
− SWPHE with SubcoolcondenseTM is compact and efficient
26/10/2020 | © Alfa Laval 9 |
Flooded ammonia evaporator
Condenser
Sub Cooler
DesuperheaterAmmonia Separator
Valve
Compressor
Heat source -
low value heat
Hot supply
Condenser with integrated Subcooling
Heat
pump
NH3
www.alfalaval.com
• T10- EW with this feature allows Condensing,
Desuperheating, and Subcooling in same plate heat
exchanger with the benefits of :
− Enabling high efficiency (COP) of the Heat Pump
− Avoiding the use multiple heat exchangers on hot side
− Enables high energy efficiency and a compact installation
T10 EW Condenser with integrated Subcooling
26/10/2020 | © Alfa Laval 10 |
Heat
pump
NH3
SubcoolcondenseTM
www.alfalaval.comSlide
11
New features to increase efficiency
OmegaPort™ noncircular port holes
Better distribution of media
Pressure drop better utilized for heat transfer.
CurveFlow™ distribution area
Fully utilizes available surface area.
Provides perfect distribution inside channel
for best heat transfer and surface stays
cleaner
ΔP connections
ΔP port
ΔP heat transfer
Heat
pump
NH3
www.alfalaval.com26/10/2020 | © Alfa Laval 13 |
www.alfalaval.comwww.alfalaval.com26/10/2020 | © Alfa Laval 14 |
References
www.alfalaval.com
− Joint venture of HOFOR, CTR and VEKS for Copenhagen City
District heating - heat recovered from sea and wastewater
26/10/2020 | © Alfa Laval 15 |
• Inaugurated in April 2019
• 5 MW full scale ammonia heat pump test
• Servicing 1100 households
• Heat sources: seawater and wastewater
• Power source: wind mills at sea
• COP = 3.2
• Flooded Ammonia Evaporators for heat recovery from sea-/wastewater 4°C → 0.5°C:
Alfa Laval semi-welded TK20-BWFG
• Condensers delivering hot water from 50°C → 80°C:
Alfa Laval semi-welded MK15-BWFT and Alfa Laval semi-welded TK20-BWFX
• Sub-cooling duties:
Alfa Laval ANH76 and Alfa Laval ANXP52
Alfa Laval supplied:
Environmental
friendly District
Heating from sea and
sewage water with
clean electricity
Heat
pump
NH3
www.alfalaval.com26/10/2020 | © Alfa Laval 16 |
District heating in Broager DK 4 MW Ground water heat pump started operation end 2016
End User: Broager District heating company
System builder: ICS - Industrial Cooling system a/s Consultant: PlanEnergi
Purpose: Useng 250 m deep ground water at 9 C as heat source delivering district heating supply of hot water at
70 C. The total capacity of 4 MW covers approximately ¾ of the heating need for Broager or about 18.000
MWh/year.
Refrigerant: Ammonia
Alfa Laval supplied: Semi Welded Plate Heat exchangers as evaporators cooling/recovering the ground water heat
from 9° C to 2 C evaporating ammonia of the heat pump at 0° C
COP Heat pump = 4,1
Heat
pump
NH3
www.alfalaval.com26/10/2020 | © Alfa Laval 17 |
Semi Welded Plate Heat Exchangers− For Ammonia Heat pumps
Major benefits
- High efficiency.
- Space saving
- Minimizes Ammonia charge
- Reliable operation
Heat
pump
NH3
www.alfalaval.com
Top Related