engleski

Preliminary design of the retrofitted district heating system using heat pumps with CO2 and NH3 refrigerants

The use of heat pumps with natural refrigerants in existing district heating systems is a recognized technology that leads to a low-carbon transition and a reduction in the use of fossil fuels. This paper presents a preliminary design for the renovation of the existing district heating system using heat pumps with natural refrigerants CO2 and NH3. The city of Rijeka has several decentralized district heating systems, and one of the systems considered in this case study produces heating energy and domestic hot water using natural gas- fired hot water boilers. The dynamic model of the district heating system, which includes the building simulation, the distribution network, and the energy generation subsystem, was used to investigate alternatives for retrofitting the thermal energy production subsystem. The aim of the present study is to evaluate the required operating temperature, to adapt the whole system for the use of heat pumps and to compare heat pumps with natural refrigerants and those with HFO and HFC refrigerants.

District heating, Heat pumps, Natural refrigerants, COP

nije evidentirano