Simulation of fluid flow in an earth-air heat exchanger with the open loop system

2nd Nommensen International Conference on Technology and Engineering

Ginting Manik, T.U.H.S.^1 ; Panjaitan, M.L.^1 ; Sitorus, T.B.^1,2

Mechanical Engineering, Universitas Sumatera Utara, Medan, Indonesia^1

PUI Energi Berkelanjutan Dan Biomaterial, USU, Medan, Indonesia^2

关键词: 3D simulations;    Air velocities;    Average air temperature;    Coefficient of Performance;    Earth-air heat exchangers;    Earthair heat exchanger (EAHE);    Open loop systems;    Research focus;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/420/1/012026/pdf
DOI  :  10.1088/1757-899X/420/1/012026

来源: IOP

【 摘 要 】

This research focuses on Earth-Air Heat Exchanger (EAHE ) that reduces the energy consumption of the air conditioner and analyzes the performance of the EAHE device by calculating the fluid dynamics modelling and validated against experimental observation. The used simulating are transient, incompressible, turbulent and 3-dimensional CFD. The simulation condition was limited to fluid flow only with a variation of 3 m/s, 2 m/s and 27m length of an air exchanger. The results of the simulation are pressure display, temperature, and velocitydeploymenton the passage of EAHE, and the comparison with the experimental results. The decrease in air velocity (Vair) can cause the out temperature (Tout), the coefficient of performance (COP) and the value of the effectiveness () for EAHE will decrease and inversely proportional to the NTU will increase. The average air temperature out of the 3D simulation result using Ansys 14.5 Software was 26.6°C for air velocity inlet 3 m/s and 26.5°C for 2 m/s, while the experimental result was 27.5°C for 3 m/sand 27.4°C of 2 m/s. The highest deviation between the simulation and the experimental result were 3.452% for 3 m/s, and the lowest was 3.048% for 2 m/s.