Integration of geothermal storage in CO2 refrigeration systems of supermarkets

• The aim of this paper is to study the benefits of integrating CO2 trans-critical booster refrigeration system with geothermal storage. The ground is used as a heat sink for sub-cooling during the summer period and as a heat source for extracting heat in the winter season. Using field measurements from medium size supermarkets in Sweden, proposed and the existing system solutions for integrating geothermal storage in CO2 refrigeration systems are modelled and compared with standard CO2 trans-critical booster system. The techno-economical comparative analysis shows that hybrid CO2 trans-critical booster system with ground source heat pump (GSHP) as an integrated geothermal solution has 6% lower annual energy use compared to a stand-alone CO2 system with heat recovery.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Energiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Energy Engineering (hsv//eng)

Nyckelord

CO2 trans-critical booster system

Field measurements

Geothermal storage integration

Modelling

Refrigeration

Supermarkets

Carbon dioxide

Geothermal energy

IIR filters

Models

Refrigerants

Retail stores

Solution mining

Waste heat

Booster system

Comparative analysis

Existing systems

Field measurement

Groundsource heat pump (GSHP)

Refrigeration system

Winter seasons

Geothermal heat pumps

Publikations- och innehållstyp

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