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{longname}Q753. How do I use Equation C-2b to calculate the annual average high heating value (HHV) of my fuel if the rule requires sampling less frequently than monthly? {longname} |
A753.
...
You
...
use
...
the
...
HHV
...
and
...
fuel
...
quantity
...
values
...
that
...
represent
...
the
...
less
...
frequent
...
sampling
...
period
...
(i.e.
...
quarterly,
...
semiannually)
...
in
...
place
...
of
...
the
...
monthly
...
values
...
that
...
are
...
normally
...
used
...
in
...
Equation
...
C-2b.
...
Two
...
examples
...
are
...
provided
...
below.
...
Example
...
1
...
:
...
Natural
...
gas
...
fuel
...
is
...
sampled
...
semiannually
...
and
...
the
...
results
...
for
...
the
...
first
...
and
...
second
...
semiannual
...
periods
...
are
...
1,020
...
Btu/scf
...
and
...
980
...
Btu/scf,
...
respectively,
...
and
...
the
...
respective
...
semiannual
...
fuel
...
quantities
...
are
...
1,000
...
scf
...
and
...
2,500
...
scf.
...
You
...
would
...
calculate
...
the
...
annual
...
average
...
HHV
...
using
...
Equation
...
C-2b
...
as
...
follows:
...
(HHV)annual
...
=
...
[((1,020
...
Btu/scf)
...
x
...
(1,000
...
scf)
...
+
...
(980
...
Btu/scf)
...
x
...
(2,500
...
scf))/3,500
...
scf
...
]
...
=
...
991
...
Btu/scf
...
Example
...
2
...
:
...
Everything
...
is
...
the
...
same
...
as
...
in
...
Example
...
1
...
except
...
that
...
you
...
missed
...
sampling
...
during
...
the
...
first
...
semiannual
...
period.
...
In
...
this
...
situation,
...
the
...
missing
...
data
...
procedures
...
would
...
apply.
...
Per
...
98.35(b)(1),
...
you
...
would
...
substitute,
...
for
...
the
...
missing
...
value,
...
the
...
arithmetic
...
average
...
of
...
the
...
quality-assured
...
values
...
of
...
the
...
HHV
...
immediately
...
preceding
...
and
...
immediately
...
following
...
the
...
missing
...
data
...
incident.
...
If
...
the
...
HHV
...
was
...
1,000
...
Btu/scf
...
for
...
the
...
second
...
semiannual
...
period
...
during
...
the
...
prior
...
year
...
and
...
the
...
HHV
...
for
...
the
...
second
...
semiannual
...
period
...
during
...
the
...
current
...
year
...
Is
...
980
...
Btu/scf,
...
the
...
substitute
...
HHV
...
used
...
for
...
the
...
first
...
semiannual
...
period
...
of
...
the
...
current
...
year
...
would
...
be
...
the
...
arithmetic
...
average
...
of
...
1,000
...
Btu/scf
...
and
...
980
...
Btu/scf,
...
or
...
990
...
Btu/scf.
...
You
...
would
...
then
...
calculate
...
the
...
annual
...
average
...
HHV
...
using
...
Equation
...
C-2b
...
as
...
follows:
...
(HHV)annual
...
=
...
[((990
...
Btu/scf)
...
x
...
(1,000
...
scf)
...
+
...
(980
...
Btu/scf)
...
x
...
(2,500
...
scf))/3,500
...
scf
...
]
...
=
...
983
...
Btu/scf
...
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{info}
Source: M. Hannan, 5/10/2013.
Approval / Publishing History: Version 1, Approved by M. Hannan, 5/10/2013
Expiration: none
Relevant Subparts: Subpart C
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