OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
THERMODYNAMIC MODELLING OF GROUND SOURCE HEAT
PUMP FOR SPACE HEATING
Rajeev Satsangi 1 , Ashok Yadav 2 and Ponnala Vimal Mosahari 1
1 Department of Mechanical Engineering, Technical College, Dayalbagh Educational Institute
(Deemed University), Dayalbagh, Agra 282110
2 Department of Mechanical Engineering, Faculty of Engineering, Dayalbagh Educational Institute
(Deemed University), Dayalbagh, Agra 282110
Corresponding Author: rajeevsatsangi2008@gmail.com
ABSTRACT
Fossil fuels are depleting day by day due to rapid industrialization and urbanization, so there are lot of effort
made all over the world to use alternative energy resources. Ground Source Heat Pump is considered as one of
the renewable energy resources used for heating and cooling purposes. In the present work, conservation
equation for mass and energy are derived for a GSHP system with simple U Tube Ground heat exchanger. The
performance characteristics of GSHP are computed in terms of COP and energetic aspect. After successful
validation of the equation and procedure, the analysis has been performed for the application of GSHP for space
heating load of 5KW for R 22 and R 134 a (Tetra fluoro ethane) refrigerants. It has been seen that R 134 a have
high COP than R 22. R134 a have no chlorine content and it can be considered as eco-friendly.
Keyword: Ground Source Heat Pump, Energy Analysis, Mass flow rate, Coefficient of Performance
1. INTRODUCTION
Non-conventional resources are the need of the future and many efforts has been made to consume these
resources for producing electricity and other purpose. Geo thermal energy is used to produce electricity with the
steam generated from underground reservoir. Since these underground steam reservoirs underlie only in
geological energetic areas, consumption of geothermal energy for generation of electric power has been limited.
In geological energetic areas steam has been used for producing energy, such as space heating, cooling. Lot of
effort has been made to make the use of ground source heat pump for heating and cooling a building for
residential purpose. For GSHP electricity is primarily needed to run heat pump but environment control energy
comes from earth, geo heat pump save tremendous amount of heat pump energy.[1]
Ground source heat pumps are installed in various countries, Austria (1996) 13000, Germany (1995) 14 000-22
000, Netherlands (1997) 900, Sweden (1998) 60 000, Switzerland (1998) 20 000, France (1999) 10 000 - 20 000,
Europe (extrapolated to end of 1998) 110 000-140 000. [2] And many controlled experiments have been
conducted for residential in Turkey by Arif Hebpasli [3 – 6]. GSHP are “Economically Preferable” [7] renewable
energy resource in term of having high net present value. A GSHP simulation model has been devolved for
Canadian climate.[7]
In last many years, many research have conducted on GSHP system regarding design, modeling and
experimental (e.g. Ozgener and Hepbasli, 2004, 2005, Sanner et al., 2003,Kavanaugh, 1992;Kavanaugh and
Rafferty, 1997; Healy and Ugursal, 1997; Hepbasli, 2002; Hepbasli et al.,2003;; Hepbasli and Akdemir, 2004; Bi
et al., 2004; Yumrutas and Kaska,2004).
In present study rather than setting experimental investigation, this paper deal with thermal analysis of GSHP for
a space heating by using Mass balance and energy balance equation. [8] The investigation has done in response
to a case study and then calculation has been done in terms of mass balance and energy balance equation.
2. GROUND SOURCE HEAT PUMP TECHNOLOGY
Ground Source Heat Pumps are the new discovery in the field of technology for heating and cooling of buildings.
They have a dual purpose to serve, along with saving energy, they also helps to save heating and cooling cost.
Ground Source Heat Pumps are the devices which has three main components: the ground side to get heat out of
or into the ground, the heat pump which helps in the conversion of heat to a suitable temperature level, and the
spacing side transferring the heat or cold into the rooms. A good design of these pumps is necessary in order to
regulate the whole system in a proper way. [9] GSHPs are eco- friendly as they are helpful in reducing the
consumption of fossil fuels, for instance, oil and natural gas, and the potentially harmful by-products associated
with their use. [10] An observation carried out in Paris and it is scientifically proven that there is a steady
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