presentation heat pump - energiteknik | · pdf fileheat exchanger auxiliary heat hvac system...

Jaime Arias Dept. of Energy Technology

Royal Institute of TechnologySweden

Heat Recovery by Heat Pumps in Heat Recovery by Heat Pumps in Supermarkets Refrigeration SystemsSupermarkets Refrigeration Systems

Jaime AriasDiv. of Applied Thermodynamics and Refrigeration

Dept. of Energy TechnologyRoyal Institute of Technology



ContentsContents

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.



1.- Introduction.

Heat Recovery from the condensers is a good possibility to decrease the heating costs in supermarkets .

Energy-saving technologies as heat recovery and floating condensing temperature, have been implemented in several supermarkets in Sweden to save energy.



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.



Heat recoverySystem 3

Chiller

Dry cooler

Heatexchanger Auxiliary

heat

HVAC System

Heatexchanger

Supply air

32°C36°C

Sale Area

Cabinets

-8°C

-4°C



Sala - Hedemora Aug 2000 - Feb 2001

-40

-20

0

20

40

60

80

2000-08 2000-09 2000-10 2000-11 2001-01 2001-02Time

tem

p[°C

], R

H[%

]

Indoor Temp. Hedemora Outdoor temp. HedemoraRH. Hedemora Indoor Temp. SalaRH. Sala Outdoor Temp. Sala



Floating Condensing System

Chiller

Dry Cooler

HeatingSystem

HVAC System

HeatExchanger

Supply Air

CondensingTemperature8°C to 40°C

Sales Area

Cabinets

-8°C

-4°C



-40 -35 -30 -25 -20 -15 -100

1

2

3

4

5

6

7

T2 [°C]

COP2

T1=40°C

T1=30°C

T1=20°C

T1=10°C

T1=50°C



Floating Condensing System andHeat Pump

Chiller

Dry Cooler

HeatingSystem

HVAC System

Supply Air

CondensingTemperature15°C to 40°C

Sales Area

Cabinets

-8°C

-4°C

Heat Pump55°C

40°C

Auxiliary



COOP Forum Birsta in Sundsvall




Total Area : 8000 m2

Area

Medium Temp. Level : 260 kW

Low Temp. Level : 60 kW

Refrigeration capacity




Energy No Heat Recovery or Heat Recovery Floating Condensing Floating CondensingFloating Condensing and Heat Pump

MWh/year MWh/year MWh/year MWh/yearTotal Electricity 2900 2800 2400 2400

Total Heat 850 200 850 330 (210 +120)

Total Energy (el+heat) 3750 3000 3250 2830




Cost No Heat Recovery or Heat Recovery Floating Condensing Floating CondensingElectricity: 0.1 EUR/kWh Floating Condensing and Heat PumpDist. Heating: 0.06 EUR/kWh

EUR/year EUR/year EUR/year EUR/yearTotal Electricity 290000 280000 240000 240000

Total Heat 51000 12000 51000 28000

Total Energy (el+heat) 341000 292000 291000 268000

Savings 49000 50000 73000




COOP COOP BirstaBirsta



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.

presentation heat pump - energiteknik | · pdf fileheat exchanger auxiliary heat hvac system...

Documents