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Title: A thermodynamic analysis of a novel bidirectional district heating and cooling network

In this study, we evaluate an ambient, bidirectional thermal network, which uses a single circuit for both district heating and cooling. When in net more cooling is needed than heating, the system circulates from a central plant in one direction. When more heating is needed, the system circulates in the opposite direction. A large benefit of this design is that buildings can recover waste heat from each other directly. We analyze the thermodynamic performance of the bidirectional system. Because the bidirectional system represents the state-of-the-art in design for district systems, its peak energy efficiency represents an upper bound on the thermal performance of any district heating and cooling system. However, because any network has mechanical and thermal distribution losses, we develop a diversity criterion to understand when the bidirectional system may be a more energy-efficient alternative to modern individual-building systems. We show that a simple model of a low-density, high-distribution loss network is more efficient than aggregated individual buildings if there is at least 1 unit of cooling energy per 5.7 units of simultaneous heating energy (or vice versa). We apply this criterion to reference building profiles in three cities to look for promising clusters.
Authors:
 [1] ;  [1] ;  [1]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Building Technology and Urban Systems
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Energy (Oxford)
Additional Journal Information:
Journal Name: Energy (Oxford); Journal Volume: 144; Journal Issue: C; Journal ID: ISSN 0360-5442
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 29 ENERGY PLANNING, POLICY, AND ECONOMY; District heating and cooling; Exergy analysis; Heat pumps; Urban buildings; Modelica
OSTI Identifier:
1436666

Zarin Pass, R., Wetter, M., and Piette, M. A.. A thermodynamic analysis of a novel bidirectional district heating and cooling network. United States: N. p., Web. doi:10.1016/j.energy.2017.11.122.
Zarin Pass, R., Wetter, M., & Piette, M. A.. A thermodynamic analysis of a novel bidirectional district heating and cooling network. United States. doi:10.1016/j.energy.2017.11.122.
Zarin Pass, R., Wetter, M., and Piette, M. A.. 2017. "A thermodynamic analysis of a novel bidirectional district heating and cooling network". United States. doi:10.1016/j.energy.2017.11.122.
@article{osti_1436666,
title = {A thermodynamic analysis of a novel bidirectional district heating and cooling network},
author = {Zarin Pass, R. and Wetter, M. and Piette, M. A.},
abstractNote = {In this study, we evaluate an ambient, bidirectional thermal network, which uses a single circuit for both district heating and cooling. When in net more cooling is needed than heating, the system circulates from a central plant in one direction. When more heating is needed, the system circulates in the opposite direction. A large benefit of this design is that buildings can recover waste heat from each other directly. We analyze the thermodynamic performance of the bidirectional system. Because the bidirectional system represents the state-of-the-art in design for district systems, its peak energy efficiency represents an upper bound on the thermal performance of any district heating and cooling system. However, because any network has mechanical and thermal distribution losses, we develop a diversity criterion to understand when the bidirectional system may be a more energy-efficient alternative to modern individual-building systems. We show that a simple model of a low-density, high-distribution loss network is more efficient than aggregated individual buildings if there is at least 1 unit of cooling energy per 5.7 units of simultaneous heating energy (or vice versa). We apply this criterion to reference building profiles in three cities to look for promising clusters.},
doi = {10.1016/j.energy.2017.11.122},
journal = {Energy (Oxford)},
number = C,
volume = 144,
place = {United States},
year = {2017},
month = {11}
}