A quasi-steady modeling approach of a heat pump water heater system with experimental validation and analysis
Shah, Tejas
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https://hdl.handle.net/2142/108495
Description
Title
A quasi-steady modeling approach of a heat pump water heater system with experimental validation and analysis
Author(s)
Shah, Tejas
Issue Date
2020-07-22
Director of Research (if dissertation) or Advisor (if thesis)
Hrnjak, Predrag S
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Heat Transfer
Fluid Dynamics
Modeling
Simulation
Computational Fluid Dynamics
CFD
Vapor Compression Refrigeration Systems
Heat Exchangers
Abstract
In a heat pump water heater system, the dynamic interdependence between the vapor compression system and the water in the storage tank poses a modeling challenge for steady-state refrigeration system models. The aim of this project is to develop a model and methodology for coupling steady-state vapor compression system modeling with a dynamic condenser cooling medium.
Consequently, a quasi-steady transient model is developed involving a steady-state vapor compression system model in Engineering Equation Solver (EES) and a computational fluid dynamics (CFD) model in ANSYS Fluent for simulating the heat transfer and fluid dynamics in the water tank. The respective models are connected at the interface of the tank wall and the water in the storage tank. The linked modeling process, described in the manuscript, involves iteration between the CFD model of the water tank and the vapor compression system model around a quasi-steady warm up of a heat pump water heating system.
The model is developed around a physical heat pump water heater system. An experimental investigation is also conducted to aid with model validation.
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