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Document Sample
Heat Recovery by Heat Pumps in
Supermarkets Refrigeration Systems
Jaime Arias
Div. of Applied Thermodynamics and Refrigeration
Dept. of Energy Technology
Royal Institute of Technology
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Contents
1.- Introduction.
2.- Heat Recovery, Floating Condensing and
Heat Pump.
3.- Supermarket COOP Forum Birsta
4.- Comparison between Floating Condensing
Floating Condensing with Heat Pump.
5.- Conclusions.
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
1.- Introduction.
Energy-saving technologies as heat recovery and floating
condensing temperature, have been implemented in
several supermarkets in Sweden to save energy.
Heat Recovery from the condensers is a good possibility to
decrease the heating costs in supermarkets .
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
1.- Introduction.
An option to heat recovery is floating condensing pressure
that decrease the energy consumption of the refrigeration
temperature at lower outdoor temperatures.
Another option to heat recovery is floating condensing
pressure and a Heat Pump connected to the coolant fluid
loop.
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Heat recovery
System 3
HVAC System
Dry cooler
Heat
exchanger
36°C 32°C
Heat
exchanger Auxiliary Chiller
heat
-8°C
Supply air
-4°C
Sale Area
Cabinets
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Sala - Hedemora
Aug 2000 - Feb 2001
80
Indoor Temp. Hedemora Outdoor temp. Hedemora
RH. Hedemora Indoor Temp. Sala
60 RH. Sala Outdoor Temp. Sala
temp[°C], RH[%]
40
20
0
-20
-40
2000-08 2000-09 2000-10 2000-11 2001-01 2001-02
Time
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Floating Condensing System
HVAC System
Dry Cooler
Heat
Exchanger
Condensing
Heating Temperature
System 8°C to 40°C
Chiller
Supply Air
-8°C
-4°C
Sales Area
Cabinets Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
7
6
5 T1=10°C
COP2
4
T1=20°C
3
T1= 30°C
2 T1= 40°C
T1= 50°C
1
0
-40 -35 -30 -25 -20 -15 -10
T2 [°C]
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Floating Condensing System and
Heat Pump
HVAC System Dry Cooler
55°C
Heat Pump
40°C
Condensing
Temperature
15°C to 40°C
Auxiliary Chiller
Heating
System -8°C
Supply Air
-4°C
Sales Area
Jaime Arias
Dept. of Energy Technology
Cabinets Royal Institute of Technology
Sweden
COOP Forum Birsta in Sundsvall
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
COOP Forum Birsta in Sundsvall
Area
Total Area : 8000 m2
Refrigeration capacity
Medium Temp. Level : 260 kW
Low Temp. Level : 60 kW
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
COOP Forum Birsta in Sundsvall
Energy No Heat Recovery or Heat Recovery Floating Condensing Floating Condensing
Floating Condensing and Heat Pump
MWh/year MWh/year MWh/year MWh/year
Total Electricity 2900 2800 2400 2400
Total Heat 850 200 850 330 (210 +120)
Total Energy (el+heat) 3750 3000 3250 2830
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
COOP Forum Birsta in Sundsvall
Cost No Heat Recovery or Heat Recovery Floating Condensing Floating Condensing
Electricity: 0.1 EUR/kWh Floating Condensing and Heat Pump
Dist. Heating: 0.06 EUR/kWh
EUR/year EUR/year EUR/year EUR/year
Total Electricity 290000 280000 240000 240000
Total Heat 51000 12000 51000 28000
Total Energy (el+heat) 341000 292000 291000 268000
Savings 49000 50000 73000
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
COOP Forum Birsta in Sundsvall
COOP Birsta
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
5.- Conclusions
According with CyberMart the highest potential of
energy saving is achieved from using a system with
Floating Condensing Temperature and a Heat Pump.
The influence of the outdoor temperature on the indoor
relative humidity of air is an important factor to take into
consideration for design of Heat Recovery or Heat Pump in
Supermarkets.
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
Jaime Arias
Dept. of Energy Technology
Royal Institute of Technology
Sweden
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