Energy procedia 160 (2019) 420-427.pdf (894.11 kB)
Study of transient indoor temperature for a HVAC room using a modified CFD method
conference contribution
posted on 2023-05-23, 14:00 authored by Zhang, L, Yu, X, Lv, Q, Cao, F, Xiaolin WangXiaolin WangThe change of the transient indoor temperature is crucial to evaluate electrical power consumption of a heat pump and thermal comfort of the room. Computational Fluid Dynamics (CFD) model can provide the most comprehensive information in transient indoor temperature simulations. In CFD models, the transient flow and temperature fields are fully coupled. This coupling leads to high computation cost and time, which limits the CFD application in practice. A segregated CFD model was then proposed to speed up the computation. However, such model is not very accurate during the transient analysis. In this paper, a semi-coupled CFD model combining advantages of the fully-coupled CFD model and the segregated CFD model was proposed. In this CFD model, the flow and the temperature fields are firstly solved by fully coupled simulation during the transient start up period and then the segregated CFD is used for the transient temperature rising simulation. This method can reduce the computation time without losing the simulation accuracy. The transient indoor temperature is studied using the proposed method and the results are compared with those obtained from both fully-coupled and segregated CFD models. The hot air temperature is first calculated using a lumped-parameter method, and then it is applied as an initial boundary condition in the CFD models. The comparison results show that the proposed semi-coupled CFD model shows a promising capability of capturing the critical transient thermal responses for the air-conditioning room, and it can effectively reduce the computing time with an acceptable accuracy.
History
Publication title
Energy ProcediaVolume
160Editors
H Chowdhury et alPagination
420-427ISSN
1876-6102Department/School
School of EngineeringPublisher
ElsevierPlace of publication
The NetherlandsEvent title
2nd International Conference on Energy and Power, ICEP2018Event Venue
Sydney, AustraliaDate of Event (Start Date)
2018-12-13Date of Event (End Date)
2018-12-15Rights statement
Copyright 2019 the Authors CC BY-NC-ND licenseRepository Status
- Open