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Energy Saving Analysis of Geothermal Heat Exchanger for Horizontal and Vertical Configuration for Tropical Country

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Emerging Trends in Mechanical and Industrial Engineering

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

The surface of earth acts as a huge source and sink of heat. Generally, the temperature of earth’s surface below few metres remains constant throughout the year. The Geothermal Heat Exchanger uses earth as heat source or sink and helps in cooling and heating purposes. They are getting more interest nowadays because of their potential to reduce primary energy consumption and also in reduction of greenhouse gases emission. This paper aims to provide energy saving potential of Geothermal Heat Exchanger in cooling mode for Indian climate conditions. A residential building has been considered to carry out the study, and this building has been assumed to be at various Indian cities. User-friendly software has been developed for this purpose based on the psychrometry of the air conditioning system. Further, the cost of laying pipes has been considered based on the design of the Geothermal Heat Exchanger system, and attempt has been made to calculate payback period of the system. Energy saving analysis has been done and results show that in Bikaner, New Delhi and Chennai energy saving was 532.93 kWh, 457.67 kWh and 186.69 kWh, respectively.

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Abbreviations

CL:

Cooling load

COP:

Coefficient of performance

DC:

Digging cost

GEHE:

Geothermal heat exchanger

HVAC:

Heating ventilation and air conditioning

NTU:

Number of transfer units

PC:

Pipe cost

PLF:

Part-load factor

STP:

Standard temperature pressure

TC:

Trench cost

C elc :

Per unit electricity cost

C fan :

Electricity cost for fan

C pipe :

Total cost of pipe in vertical or horizontal configuration

C saving :

Electricity cost saving

E saving :

Energy saving with use of GEHE, kWh

F SC :

Short circuit factor

Lc:

Length of tube required for heating (m)

Lh:

Length of tube required for cooling (m)

N m :

Number of months cooling required

N h :

Number of hours air conditioning system runs in a day

P :

Fan power required for air flow (W)

Q :

Fluid flow rate (m3/s)

R CL :

Reduction in cooling load

R b :

Borehole resistance

R ga :

Effective thermal resistance pulse rate of the earth (mK/W)

R gm :

Effective thermal resistance pulse rate of the ground (mK/W)

Rgst:

Effective thermal resistance short-term pulse rate of the earth (mK/W)

Ut:

Overall heat transfer coefficient (KJ/Kg°K)

c p :

Specific heat capacity (KJ/Kg°K)

h :

Specific enthalpy of air, KJ/kg

m :

Air mass flow rate, kg/s

n :

Total number of tubes

Δp:

Drop in pressure for tube (N/m2)

q :

Amount of heat transferred per unit time (W)

r i :

Tube inner radius (m)

r o :

Tube outer radius (m)

t g :

Average ground temperature (oC)

t p :

Long-term ground temperature penalty due to the heat transfer variations of the earth (°C)

ρ :

Density of fluid (Kg/m3)

c :

Cooling

h :

Heating

m :

Design month

*:

Multiplication

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Authors and Affiliations

  1. Department of Mechanical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, 131039, Murthal, Sonipat, Haryana, India

    Devesh Sharma & Amit Sharma

Authors
  1. Devesh Sharma
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  2. Amit Sharma
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Correspondence to Amit Sharma .

Editor information

Editors and Affiliations

  1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada

    Xianguo Li

  2. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, China

    Mohammad Mehdi Rashidi

  3. Department of Mechanical Engineering, The NorthCap University, Gurugram, Haryana, India

    Rohit Singh Lather

  4. Department of Mechanical Engineering, The NorthCap University, Gurugram, India

    Roshan Raman

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Sharma, D., Sharma, A. (2023). Energy Saving Analysis of Geothermal Heat Exchanger for Horizontal and Vertical Configuration for Tropical Country. In: Li, X., Rashidi, M.M., Lather, R.S., Raman, R. (eds) Emerging Trends in Mechanical and Industrial Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-6945-4_27

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  • DOI: https://doi.org/10.1007/978-981-19-6945-4_27

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-19-6944-7

  • Online ISBN: 978-981-19-6945-4

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