Iii. equipment performance – State Industries 317913-000 User Manual

Page 6

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•

This example could represent an industrial process which is operated for two continuous shifts
a day.

•

Hot water is used at a maximum rate of 3.3 gpm or 198 gph. (It is important to establish
maximum flow rate and water temperature rise in order to select a heater model.)

•

In this example heater recovery is most important as the system for all practical purposes is an
instantaneous one. That is, it heats the water at the rate it is being used.

•

If a tank type water heater is used, the tank size is minimum . . . just large enough to put the
heat into the water.

Recovery Capacity Tables

Recovery capacity tables are the published results of laboratory tests which establish the ability of
a heater to raise the temperature of a given volume of water a certain number of degrees within a
given time period.

Recovery tables are prepared for all State commercial water heaters regardless of the type fuel
used. In each instance the thermal efficiency of the particular type heater has been taken into
consideration.

The tables shown here are representative for the types of heaters produced by State using a
variety of fuels. In this publication, for electricity, recovery at 1 k

for various temperature rises is

shown. The table can then be used without regard to model number as all electric heaters are
considered 100% thermal efficient.

III.

Equipment Performance

Continuous Use Profile

Recovery Capacity

Calculated at

Thermal Efficiency of

@ 94%

@100%

Recovery Capacities

Electric

Tank Type

Kilowatts*

Btu

TemperatureRise-Degrees F - Gallons Per Hour

(

)

Produce

30 40 50 60 70 80 90 100 110 120 130 140

1.0

3,413

13.6 10.3 8.1 6.8 5.8 5.1 4.5 4.1 3.7 3.5 3.3 3.0

*1 KW = 1000 Watts

Recovery Capacities Gas Tank Type

Approx.

Input Rating

Gal.

Btu/Hour

TemperatureRise-Degrees F - Gallons Per Hour

Model

Cap.

Nat. & Prop.

80 90 100 110 120 130 140

SUF
100-150

100

150,000

570 427 342 285 244 214 190 171 155 142 131 122

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