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Title: Modeling of thermal storage systems in MILP distributed energy resource models

Journal Article · · Applied Energy
 [1];  [2];  [3];  [2];  [4];  [4]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chalmers Univ. of Technology, Goteborg (Sweden)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Center for Energy and Innovative Technologies(CET), Hofamt Priel (Austria)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Lisbon (Portugal)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Thermal energy storage (TES) and distributed generation technologies, such as combined heat and power (CHP) or photovoltaics (PV), can be used to reduce energy costs and decrease CO2 emissions from buildings by shifting energy consumption to times with less emissions and/or lower energy prices. To determine the feasibility of investing in TES in combination with other distributed energy resources (DER), mixed integer linear programming (MILP) can be used. Such a MILP model is the well-established Distributed Energy Resources Customer Adoption Model (DER-CAM); however, it currently uses only a simplified TES model to guarantee linearity and short run-times. Loss calculations are based only on the energy contained in the storage. This paper presents a new DER-CAM TES model that allows improved tracking of losses based on ambient and storage temperatures, and compares results with the previous version. A multi-layer TES model is introduced that retains linearity and avoids creating an endogenous optimization problem. The improved model increases the accuracy of the estimated storage losses and enables use of heat pumps for low temperature storage charging. Ultimately,results indicate that the previous model overestimates the attractiveness of TES investments for cases without possibility to invest in heat pumps and underestimates it for some locations when heat pumps are allowed. Despite a variation in optimal technology selection between the two models, the objective function value stays quite stable, illustrating the complexity of optimal DER sizing problems in buildings and microgrids.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Electricity (OE)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1163653
Alternate ID(s):
OSTI ID: 1247566
Report Number(s):
LBNL-6757E
Journal Information:
Applied Energy, Vol. 137, Issue C; ISSN 0306-2619
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 111 works
Citation information provided by
Web of Science

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Cited By (4)

Thermal Energy Storage for Grid Applications: Current Status and Emerging Trends journal January 2020
Grid-based multi-energy systems—modelling, assessment, open source modelling frameworks and challenges journal November 2018
A Comprehensive Methodology for the Integrated Optimal Sizing and Operation of Cogeneration Systems with Thermal Energy Storage journal March 2019
A multiperiod multiobjective framework for the synthesis of trigeneration systems in tertiary sector buildings journal November 2019