Can Direct Water Pressure Efficiently Drive
Can Direct Water Pressure Efficiently Drive Small
Heat Pumps For Rural Use ?
Deepthi Priyanka Vijayan
Matriculation No. 2101611
Securing access to an affordable heat energy services is of
central importance to our society. Average modeled fuel bill for
space heating in Scotland is found to be 44%. In the very region
where fuel poverty is most widespread, upland streams are
common, raising the possibility of using hydropower as a
renewable source to reduce costs can be done.
Supervised By Dr Paul Younger
The schematic diagram shows how the entire system works.
Mathematical calculations are done to design the hydraulic ram.
• An assumption is made as the capacity of the heat pump
compressor is 7 kW. Based on which all the other parameters
• The supply pipe is kept inclined with a head of 3m to obtain the
velocity of 7.07 m/s for the hydraulic ram to work efficiently to
develop required hydraulic pressure.
• The required pressure to be developed by the hydraulic ram is
• The vane motor converts this hydraulic pressure to mechanical
energy to run a 7 kW compressor and the heat loads are
calculated for a single house.
As a result direct water pressure is used to run a heat pump
where further emphasis is given on the hydraulic ram pump to
develop this pressure to run the compression cycle of the heat
• Discharge to the hydraulic ram pump from the supply pipe is
• Discharge from the hydraulic ram pump to the hydro motor is
• Pressure obtained from the hydraulic ram is 400822 N/m2.
• With this obtained pressure the mechanical energy is given to
the compressor which runs the heat pump efficiently with the
COP of 4.142.
• To design a mathematical
model to analyze the feasibility to
run a heat pump using direct water pressure.
• Thereafter, designing of the hydraulic ram pump to develop that
pressure which is required by the compressor heat pump is
• A mechanical device i.e. a vane motor is used to transfer the
hydraulic pressure to the heat pump compressor.
• Lastly, the heat loads calculations are made for a single house
in the highlands.
• The aim of the project was to study the feasibility of running a
heat pump with a direct water pressure and it is found that it is
possible to run a heat pump efficiently with water pressure.
• The hydraulic pressure is developed to obtain 29 kW which can
heat up to 858 square feet of house area, which is an average
house size in Scotland.
• Hence, a heat pump used for space heating is developed so
that it can be used in areas where connecting to an electricity
local network is highly difficult.
The water from a flowing stream is withdrawn using a supply
pipe. The hydraulic ram is used to increase the hydraulic
pressure of the water. The obtained hydraulic pressure from the
ram pump is given to the hydro-motor. The vane motor acts as a
prime mover and it converts the hydraulic energy into the
mechanical energy. Hence the mechanical energy gives the
required rotary motion which is necessary to run a heat pump
• The same power that is available from the hydraulic ram can be
utilised for cooling the house during the summer.
•The water that comes out of the hydro motor can be recycled
through the evaporator so that the COP of the heat pump can be
increased. The heat extracted from the water will be more than
the heat extracted from the atmospheric air.
•Attempts can be made to use a hydraulic turbine in place of
•The mechanical power from the vane motor can be utilised for
other heating purposes like water heating and to operate other
University of Glasgow, charity number SC004401
• G. Walker and R. Day, “Fuel poverty as injustice: Integrating
distribution, recognition and procedure in the struggle for
affordable warmth,” Energy Policy, vol. 49, pp. 69–75, Oct. 2012.
• Shuaibu Ndache MOHAMMED “ Design and Construction of a
hydraulic ram” Available: http://lejpt.academicdirect.org
• Anthony Esposito, “Fluid Power with Applications”, Sixth
Edition: Pearson Education, 2003.
• Wilbert F.Stoecker/Jerold W.Jones,“Refrigeration and Air
Conditioning”,Second Edition, McGraw Hill International Editions