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Simulation of Thermal Energy Storage Heat Exchanger Used for Defrosting in Air Source Heat Pump

Author: HuangTing
Tutor: JiangYiQiang
School: Harbin Institute of Technology
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Defrost Accumulator Phase change material Enthalpy model Optimal design
CLC: TU833
Type: Master's thesis
Year: 2007
Downloads: 255
Quote: 2
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Abstract


The hot gas defrost system of air source heat pump accumulator (A Thermal Energy Storage Based Hot Gas Defrosting System for Air Source Heat Pump) is a new system of defrosting of air source heat pump technology and regenerative technologies combine. The accumulator it uses a phase change material of the air-source heat pump efficiently residual heat stored up in the system when heat run, the run time of the defrosting condition in turn as the low heat when the heat pump hot gas defrost, by the phase of the phase change material becomes put heat to the system to provide the heat required for defrosting. No external heat source, completely solve the traditional air-source heat pump defrost defrost energy from the compressor acting, etc. caused by the problems of instability and poor reliability of plant operation. In this paper, based on the analysis of the forms and characteristics of air source heat pump accumulator hot gas defrost system, given the different operating modes of the system processes, and is suitable for energy storage defrosting phase change material (Phase Change Material PCM) analysis and selection; given the physical model of the phase change thermal storage. Defrost energy consumption data provided by the literature as a basis for the preliminary design of the structure of an air source heat pump defrost use different storage materials storage heat exchanger. Based on the enthalpy method to create a mathematical model of the heat transfer process of the phase change material in the accumulator, discrete model equations using the finite difference method, and format and line-by-line alternating direction implicit iterative method for solving the discrete equations to Na 2 SO 4 · 10H 2 O ideal conditions of heat loss as a phase change material, and do not consider this accumulator regenerative and the heat release process simulation study. Finally, from the two aspects of the heat transfer medium and a phase change material, the detailed analysis of the structure of the inlet of the refrigerant temperature, flow rate, inlet dryness, accumulator, different from the PCM (Rt31, A32, capric acid, Na 2 < / sub> SO 4 · 10H 2 O, CaCl 2 · 6H 2 O) and other major factors heat storage and heat release characteristics of the accumulator and the simulation results to optimize the design parameters of the accumulator. The results of this study to air source heat pump storage defrost key components of the new system storage reasonable match between the various parameters of the optimization of the heat exchanger design and system provide a useful reference for the promotion and application of the system to provide a theoretical support and technical reserves.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Heating
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