0 An effective method to recover water used for regeneration
of ion exchange resins is to use a reverse
osmosis system in a batch treatment mode.
Such a system involves recirculation of the partially
treated water back into the feed tank, causing
the water to heat up. The water can be cooled
using one of two systems: a single-pass heat exchanger
or a closed-loop heat exchange system.
The single-pass system, good for 3 years, requires
a small chiller costing $920 plus stainless steel
tubing, connectors, valves, etc. costing $360. The
cost of water, treatment charges, electricity, etc.
will be $3.10 per hour. The closed-loop system
will cost $3850 to buy, will have a useful life of
5 years, and will cost $1.28 per hour to operate.
What is the minimum number of hours per year
that the cooling system must be used in order to
justify purchase of the closed-loop system? The
MARR is 10% per year, and the salvage values
are negligible.
0 An effective method to recover water used for regenerationof ion exchange resins is to use a reverseosmosis system in a batch treatment mode.Such a system involves recirculation of the partiallytreated water back into the feed tank, causingthe water to heat up. The water can be cooledusing one of two systems: a single-pass heat exchangeror a closed-loop heat exchange system.The single-pass system, good for 3 years, requiresa small chiller costing $920 plus stainless steeltubing, connectors, valves, etc. costing $360. Thecost of water, treatment charges, electricity, etc.will be $3.10 per hour. The closed-loop systemwill cost $3850 to buy, will have a useful life of5 years, and will cost $1.28 per hour to operate.What is the minimum number of hours per yearthat the cooling system must be used in order tojustify purchase of the closed-loop system? TheMARR is 10% per year, and the salvage valuesare negligible.
การแปล กรุณารอสักครู่..