LOW GRADE WASTE HEAT RECOVERY FROM CHILLERS
Overview
Facilities like hospitals, hotels etc., spends considerable
amount of energy is hot water generation through different conventional energy
sources. These facilities also uses major portion of electrical energy for
catering its entire cooling load. Maximum cases this cooling load is delivered
by chillers through vapor compression technology. Around 30-40% of total energy
involved in the vapor compression system is waste heat. Low grade waste heat
recovery systems are available in the market which can recover heat from the
refrigeration cycle and can produce hot water at almost zero conventional
energy input.
Working
These low grade
waste heat recovery systems extract heat energy from the high pressure vapor
line going in to condenser through a simple modular heat exchanger.                          Â
Amount of
energy recovery depends on the refrigerant type and its temperature.A good
amount of waste heat can be recovered when the discharge temperature of the
refrigerant is more than 550C.Typical heat recovery will be around
15% of condenser load for ammonia based refrigeration system,10% for R22 based
and 6 % for R134a based.
Case Study:
A large
hotel in south India was using 250 TR, R134a based screw chiller for central
air conditioning. Diesel boilers was used for hot water generation in the range
of 45 – 520C.Double walled heat exchangers were installed in the high pressure
line to recover heat energy from refrigerant and generate required hot water at
almost no cost. Nearly 70 KW of heat has been recovered which reduced
almost 80 % of the diesel consumption in boilers.
#Energy #Energyefficiency #Chiller #Wasteheat recovery #wastetoenergy
Thanks for share your blog here . Emergency Response Group inc
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