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research-article

Investigating the effect of soil type and moisture on the performance of a ground source heat pump system used for a greenhouse in Iran

[+] Author and Article Information
Pedram Bigdelou

Department of Renewable Energies and Environmental Engineering, Faculty of New Sciences and Technologies, University of Tehran, North Kargar Street, Tehran 14395-1561 Iran
pedrambigdelou@ut.ac.ir

Fathollah Pourfayaz

Associate Professor, Department of Renewable Energies and Environmental Engineering, Faculty of New Sciences and Technologies, University of Tehran, North Kargar Street, Tehran 14395-1561 Iran
pourfayaz@ut.ac.ir

Younes Noorollahi

Associate Professor, Department of Renewable Energies and Environmental Engineering, Faculty of New Sciences and Technologies, University of Tehran, North Kargar Street, Tehran 14395-1561 Iran
noorollahi@ut.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4041344 History: Received January 16, 2018; Revised July 23, 2018

Abstract

We investigate the effect of soil type and moisture on the operation of a ground source heat pump system in supplying the energy needs of a greenhouse in Karaj, Alborz province, Iran in terms of the required length of ground heat exchanger, the working hours, the electricity consumption, as well as the COP of heat pumps. In order to predict the capacity of heat pumps, governing equations of heat transfer in the ground heat exchanger are numerically solved through a finite difference method. Thermal properties of various soil types, namely sandy soil, sand, silty loam, and silty clay, with three different levels of moisture content referred to as dry, damp, and saturated, are considered as the main inputs for the computer code. The simulations indicate that when moisture is increased from dampness to saturation, the annual working hours of heat pumps decrease by 1.1%, 5.1%, 6.1%, and 4.6%, and the their annual electricity consumption is reduced by 2.2%, 10.6%, 12.6%, and 9.7% for sandy soil, sand, silty loam, and silty clay, respectively. Moreover, the average COP of heat pumps increase by 0.9%, 4.0%, 5.2%, and 3.7% in heating mode and 2.4%, 13.0%, 16.5%, 11.7% in cooling mode for the mentioned soils, respectively.

Copyright (c) 2018 by ASME
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