TY - JOUR
T1 - The role of heat storages in facilitating the adaptation of district heating systems to large amount of variable renewable electricity
AU - Hast, Aira
AU - Rinne, Samuli
AU - Syri, Sanna
AU - Kiviluoma, Juha
N1 - Funding Information:
The authors gratefully acknowledge the financial support from Tekes , the Finnish Funding Agency for Innovation , through the FLEX e program . Furthermore, the two anonymous reviewers of this article are acknowledged for their helpful comments and suggestions. Appendices Fig. A.1 Heat and electricity production and consumption during one whole year (starting from May) in the studied electricity price scenarios. Heat storage content in these scenarios is also illustrated. Fig. A.2 Average costs for one produced MWh of heat in the studied electricity price scenarios when different assumptions for investment costs of solar collector are tested. Since the system does not include a heat storage, production with CHP unit is not prioritized. Fig. A.3 Average costs for one produced MWh of heat in the studied electricity price scenarios when different assumptions for investment costs of heat pump are tested. Since the system does not include a heat storage, production with CHP unit is not prioritized. Fig. A.4 Average costs for one produced MWh of heat in the studied electricity price scenarios when different assumptions for investment costs of heat storage are tested. Production with CHP unit is prioritized. Fig. A.5 Average costs for one produced MWh of heat in the studied electricity price scenarios when different assumptions for investment costs are tested. Heat pump (20 MW) is included in the system in all cases and different sizes for heat storage are studied. Production with CHP unit is prioritized.
Publisher Copyright:
© 2017 Elsevier Ltd
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - In the future energy system, it is likely that there is
more variation in the electricity prices due to higher
share of renewable energy sources in electricity
production. In this paper, the effects of more variable
electricity prices were analyzed in a district heating
(DH) system that includes both combined heat and power
(CHP) plant, fired mainly by biomass and heat only
boilers. The most cost optimal dimensioning and
combination of heat storages, heat pumps and solar
collectors are searched in three future electricity price
scenarios. When the impacts of different system
components were analyzed separately, it was found that
especially a larger heat storage (1% of annual DH energy)
is economical. In addition, the results indicate that the
most economical size for a heat pump is around 20% of
peak heat demand. Yet, the most profitable solution was
to include both a heat storage and a heat pump in the DH
system. According to our results, solar collector was not
a profitable investment in the studied DH system.
AB - In the future energy system, it is likely that there is
more variation in the electricity prices due to higher
share of renewable energy sources in electricity
production. In this paper, the effects of more variable
electricity prices were analyzed in a district heating
(DH) system that includes both combined heat and power
(CHP) plant, fired mainly by biomass and heat only
boilers. The most cost optimal dimensioning and
combination of heat storages, heat pumps and solar
collectors are searched in three future electricity price
scenarios. When the impacts of different system
components were analyzed separately, it was found that
especially a larger heat storage (1% of annual DH energy)
is economical. In addition, the results indicate that the
most economical size for a heat pump is around 20% of
peak heat demand. Yet, the most profitable solution was
to include both a heat storage and a heat pump in the DH
system. According to our results, solar collector was not
a profitable investment in the studied DH system.
KW - district heat
KW - renewable energy
KW - thermal energy storage
KW - heat pump
UR - http://www.scopus.com/inward/record.url?scp=85020385015&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2017.05.113
DO - 10.1016/j.energy.2017.05.113
M3 - Article
VL - 137
SP - 775
EP - 788
JO - Energy
JF - Energy
SN - 0360-5442
IS - May
ER -
