Utilization of res using seawater source heat pump with and without energy storage: Comparison of Thermal and Battery Energy Storage

Abstract

Heat and cooling stands out with the great potential in decarbonisation since they have a large share in the final energy consumption. Power-to-heat technologies may contribute to the heat sector decarbonisation as well as the integration of renewables if they are sufficiently flexible. They are also shown to have a good effect on the system costs. This work will analyse the potential of seawater heat pump system for the utilization of high share of electricity production from the renewables. The Old City of Dubrovnik is selected as a case study because of its specific situation. A large number of the outdoor units are not well approved by UNESCO since the Old City is under the protection of the UNESCO World Heritage Centre. The results of the study showed that the combination of wind and solar electricity production can cover 67% of load for stand-alone seawater heat pump system based on hourly time step. Utilization of renewable electricity generation, for this case, resulted in 433.71 tCO2/y emission reduction. System based on 10 minutes time step gave poorer results by 6%. System with the additional energy storage gained best results in the case of combined wind and solar electricity generation, as well. It resulted in storage capacity reduction by 78% according to the case of solar electricity generation and by 60% according to the wind electricity generation. Battery energy storage resulted in 40 times lower volume and 13 times higher investment costs and levelised cost of heat in comparison to the thermal energy storage.

Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

“…On the supply side, this process is characterized by substitution of CHP and heat plants fueled mostly by fossil fuels with heat sources based on low-temperature waste heat and renewable energy sources. In this transition process, introduction of heat pumps is recognized as a very efficient solution for utilization of different low-temperature heat sources [3][4][5][6]. In addition, due to significant increase of RES utilization for electricity generation, implementation of electrically driven heat pumps in district heating systems should be one of the main mechanisms for decarbonization of heating energy sector [7][8][9].…”