Dynamic Simulation of a Liquid Dessicant Cooling System Using the Energy Kernel System

Technical Report · Fri Feb 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/5968703· OSTI ID:5968703

Nataf, Jean-Michel ^[1]; Winkelmann, Frederick ^[1]

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1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

The Energy Kernel System (EKS) is a simulation environment for building energy analysis under development at Lawrence Berkeley Laboratory. EKS is a very flexible, highly modular environment that allows users to create customized models of thermal systems by linking together calculation objects - either defined by the user or obtained from a library - that describe the individual components of the system. A principal departure from other simulation environments is that system models are constructed from submodel objects that are defined without prescribed input or output interfaces, yielding greater modeling flexibility. Also, graph theoretic techniques are employed to determine the solution sequence, including reduction of the iterative problem size at each time step. To demonstrate the use of EKS for modeling complex physical systems, the authors present in this paper a dynamic EKS simulation of a hybrid liquid desiccant cooling system. They show (1) how EKS calculation objects are generated automatically using MACSYMA (MIT, 1983), given the basic algebraic and differential equations for the system; (2) how EKS objects are linked into macro objects that describe system components; and (3) how macro objects are linked together to form a mathematical network representing the entire system. Finally, they show graphically the numerical results of running a time-dependent simulation of the system.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Conservation & Renewable Energy (CE)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5968703
• Report Number(s): LBL--29610; ON: DE91010273
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
97 MATHEMATICS AND COMPUTING
990200 -- Mathematics & Computers
ALKALI METAL COMPOUNDS
BUILDINGS
CHLORIDES
CHLORINE COMPOUNDS
COMPUTER CODES
COMPUTER GRAPHICS
COMPUTERIZED SIMULATION
COOLING SYSTEMS
DESICCANTS
E CODES
ENERGY SYSTEMS
HALIDES
HALOGEN COMPOUNDS
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
PROGRAMMING LANGUAGES
REGENERATORS
SIMULATION
SPACE HVAC SYSTEMS
TIME DEPENDENCE