Modeling & Simulation of a Horizontal Ground-Coupled Heat Exchanger to investigate Subsurface Heat Transfer for a Tropical Climate.

Abstract

The main objective of this research was to examine the long-term performance of a horizontal ground heat exchanger for space cooling in Trinidad, West Indies. The COMSOL Multiphysics Finite Element Analysis Simulation Software was used to model, simulate and monitor the effects of heat transfer for a horizontal geothermal heat pump (GHP) system by using in-situ ground data, and as a result, determine the temperature influence on the surrounding soil. Weather data was also used to incorporate thermal effects on the ground since the loops were considered to be shallow at a depth of 1.25 m. The total cooling load for an office of dimensions (3.66 m x 3.66 m x 3.66 m) was calculated to be approximately 2.2 kW and the cooling capacity of the GHP used was 2.3 kW. The minimum length of horizontal ground heat exchangers required was determined. Modelling of heat exchangers was performed and simulations were done for a 12-month period in order to investigate the feasibility of the GHP system for Trinidad and Tobago