ASHRAE Journal - December 2021 - 32

TECHNICAL FEATURE
TABLE 2 Input parameters and results obtained using the modified ASHRAE equation.
TABLE 3 Input parameters and results obtained using the alternative ASHRAE method.
Alternative ASHRAE Method
The 2019 ASHRAE Handbook-HVAC Applications16 suggests
a second sizing method (in addition to the classic
ASHRAE equation) called the alternative ASHRAE
method. In this method, the ground thermal resistances,
Rg,y, Rg,m and Rg,h (terms in brackets in Equation 7)
are evaluated with g-functions. Since g-functions
include borehole thermal interactions caused by the
annual ground thermal imbalance, the temperature
penalty, Tp, is no longer needed.
qg g 22 +
2πk qR
y 
L =
()//t tt gm tt
() − ()−
3 31 +− ()−3 2


tt
()−
qg()−
h tt


in hp
32
TT
,,
2
/
+
32
out hp
g hb

 +
Tg
ASHRAE JOURNAL ashrae.o rg D ECEM BER 2 0 2 1
ππ

k q g gk() ()−3 1
g
(7)
Most current commercial sizing tools use libraries of
precalculated g-functions with limited availability for
irregular bore field layouts. However, in GHXSizing,
g-functions can be evaluated for both regular and irregular
configurations. In addition, evaluation of L with
Equation 7 involves an iterative process because g-functions
depend on L, which is unknown a priori.
The alternative ASHRAE method is illustrated using
GHXSizing to solve the second sizing problem contained
in the 2019 ASHRAE Handbook-HVAC Applications17 for a
3 × 2 bore field. Table 3 shows the input parameters and
results for this problem.
The fluid thermal heat capacity, density, flow rate
and maximum heat pump inlet temperature are set
so that the maximum mean fluid temperature in the
borehole, shown in cell D62, is 35°C (95°F), as given

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ASHRAE Journal - December 2021

Table of Contents for the Digital Edition of ASHRAE Journal - December 2021

Contents
ASHRAE Journal - December 2021 - Intro
ASHRAE Journal - December 2021 - BB1
ASHRAE Journal - December 2021 - BB2
ASHRAE Journal - December 2021 - Cover1
ASHRAE Journal - December 2021 - Cover2
ASHRAE Journal - December 2021 - 1
ASHRAE Journal - December 2021 - Contents
ASHRAE Journal - December 2021 - 3
ASHRAE Journal - December 2021 - 4
ASHRAE Journal - December 2021 - 5
ASHRAE Journal - December 2021 - 6
ASHRAE Journal - December 2021 - 7
ASHRAE Journal - December 2021 - 8
ASHRAE Journal - December 2021 - 9
ASHRAE Journal - December 2021 - 10
ASHRAE Journal - December 2021 - 11
ASHRAE Journal - December 2021 - 12
ASHRAE Journal - December 2021 - 13
ASHRAE Journal - December 2021 - 14
ASHRAE Journal - December 2021 - 15
ASHRAE Journal - December 2021 - 16
ASHRAE Journal - December 2021 - 17
ASHRAE Journal - December 2021 - 18
ASHRAE Journal - December 2021 - 19
ASHRAE Journal - December 2021 - 20
ASHRAE Journal - December 2021 - 21
ASHRAE Journal - December 2021 - 22
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ASHRAE Journal - December 2021 - 24
ASHRAE Journal - December 2021 - 25
ASHRAE Journal - December 2021 - 26
ASHRAE Journal - December 2021 - 27
ASHRAE Journal - December 2021 - 28
ASHRAE Journal - December 2021 - 29
ASHRAE Journal - December 2021 - 30
ASHRAE Journal - December 2021 - 31
ASHRAE Journal - December 2021 - 32
ASHRAE Journal - December 2021 - 33
ASHRAE Journal - December 2021 - 34
ASHRAE Journal - December 2021 - 35
ASHRAE Journal - December 2021 - 36
ASHRAE Journal - December 2021 - 37
ASHRAE Journal - December 2021 - 38
ASHRAE Journal - December 2021 - 39
ASHRAE Journal - December 2021 - 40
ASHRAE Journal - December 2021 - 41
ASHRAE Journal - December 2021 - 42
ASHRAE Journal - December 2021 - 43
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ASHRAE Journal - December 2021 - 50
ASHRAE Journal - December 2021 - 51
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ASHRAE Journal - December 2021 - 57
ASHRAE Journal - December 2021 - 58
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ASHRAE Journal - December 2021 - 63
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ASHRAE Journal - December 2021 - Cover3
ASHRAE Journal - December 2021 - Cover4
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