Waste heat utilization is well known for saving energy, cost and
environment, but its practical implementation is not common
especially in developing countries. Heat is produced as a result of
energy usage. Overall efficiency of the process improves if waste
heat is utilized before it is lost to environment. This book
discusses the waste heat recovery system designed for a Glass
Factory in Pakistan. In order to extract heat from flue gases, the
dew point temperature is first calculated in order to have a lower
limit of flue gas exit. The exergy of flue gases is then determined
based on this limiting value. This available energy is to be used
to preheat the furnace oil during the low ambient temperature
season. In order to impart this energy to the furnace oil, two heat
exchangers have been designed. The first heat exchanger transfers
heat from the flue gases to an intermediate heat transfer medium.
The second heat exchanger is designed to transfer heat from to the
furnace oil. An insulated piping network is also designed in order
to meet the purpose. Two pumps are selected in order to pump these
fluids. The expected payback period of investment is also
calculated.
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