Abstract
This paper presents a feasibility and performance study of ground source heat pump (GSHP) coupled with horizontal ground heat exchanger (HGHX) used for cooling residential unit equipped with radiant floor system (RFs) under the meteorological conditions of Saharan environment in Ouargla, city located in Southeast Algeria. A dynamic simulation system is developed using TRNSYS software for modeling the performance of the GSHP system. To verify the reliability of GSHP including HGHX system programs, the modeling procedure was validated against experimental data from a horizontal ground source heat pump system (HGSHPs) installed at the Research and Technology Center of Energy (CRTEn), Tunisia, and a good agreement was obtained. Then, to obtain an acceptable balance between system efficiency and total cost of HGSHPs an economic analysis was carried out to determine the optimum design parameters of the HGHX. The simulation results obtained from this study indicated that the HGSHPs could effectively solve cooling problem and reduce traditional energy consumption in the Saharan areas; it is possible to lower the mean indoor air temperature below 27 °C and raise the average relative humidity to reach 73.97%. By concentrating principally on the thermal-economic optimization, the optimized COP of the GSHP that combines the reliability and economy of cooling in long term was found to be 3.89.
Highlights
The energy consumption in urban buildings has gained an increasing demand recently due to the high comfort standards [1]
The TRNSYS model presented and validated above is used to envisage the effectiveness of the horizontal ground source heat pump system (HGSHPs) for air-conditioning a typical house in Saharan climate
The optimized values of all the design m_wÀGHX parameters were performed in the HGSHP model that used for cooling a residential building with 95 m2 of surface in the city of Ouargla, Southeast of Algeria
Summary
The energy consumption in urban buildings has gained an increasing demand recently due to the high comfort standards [1]. The effect of all geometric properties of the designed horizontal GHE as well as the effects of the rate of increase in electricity prices was investigated by defining a reference function (total cost) as an optimization parameter In their simulation study, found that the number of parallel pipe, burial depth, pipe spacing, tube diameter and pipe length have a major impact on the performance of the GSHP and the reference function because it affects the excavation and labor costs and the amounts of heat extracted from soil or transferred to soil, simultaneously. It was found that the poor design of the GSHP system caused lower performance factors when compared their results to other heat pumps operating under the same design values They concluded that it is necessary to conduct a pre-design analysis to determine optimal system parameters that will ensure minimum energy consumption and favorable costs with the help of GSHP simulation models. To ensure the reliability of the optimization results, the simulation inlet and outlet temperatures of the HGHX were calibrated using ASHRAE guideline constraints
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