Hybrid CHP/Geothermal Borehole System for Multi-Family Building in Heating Dominated Climates

Saeed Alqaed, Jawed Mustafa, Kevin P. Hallinan and Rodwan Elhashmi
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Saeed Alqaed: Mechanical Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia
Jawed Mustafa: Mechanical Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia
Kevin P. Hallinan: Department of Mechanical & Aerospace Engineering, University of Dayton, Dayton, OH 45469-0238, USA
Rodwan Elhashmi: Department of Mechanical & Aerospace Engineering, University of Dayton, Dayton, OH 45469-0238, USA

Sustainability, 2020, vol. 12, issue 18, 1-16

Abstract: A conventional ground-coupled heat pump (GCHP) can be used to supplement heat rejection or extraction, creating a hybrid system that is cost-effective for certainly unbalanced climes. This research explores the possibility for a hybrid GCHP to use excess heat from a combined heat power (CHP) unit of natural gas in a heating-dominated environment for smart cities. A design for a multi-family residential building is considered, with a CHP sized to meet the average electrical load of the building. The constant electric output of the CHP is used directly, stored for later use in a battery, or sold back to the grid. Part of the thermal output provides the building with hot water, and the rest is channeled into the GCHP borehole array to support the building’s large heating needs. Consumption and weather data are used to predict hourly loads over a year for a specific multi-family residence. Simulations of the energies exchanged between system components are performed, and a cost model is minimized over CHP size, battery storage capacity, number of boreholes, and depth of the borehole. Results indicate a greater cost advantage for the design in a severely heated (Canada) climate than in a moderately imbalanced (Ohio) climate.

Keywords: combined heat and power; smart cities; energy efficient; ground-coupled heat pump; storage capacity; multi-family residence (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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