ASHRAE Journal - September 2019 - 31

coil and recommended to be around
3 to 5 psi (20 to 34 kPag) to ensure
positive pressure at all times
P_(bldg.pump head) = actual pump
head
The speed of the pump needs
to be modulated to keep the PSV
upstream pressure equal to the PSV
set point. If the PSV upstream pressure is higher than the PSV set point
pressure, then the pump needs to
decrease its speed and the PSV will
adjust itself to increase flow to maintain the set point value. If, instead,
the PSV upstream pressure is lower
than PSV set point, the pump needs
to increase its speed and the PSV also
needs to modulate to reduce flow.

Redefine

Flexibility

PSV System Performance
Figure 7 and 8 illustrate the PSV
operation on the CHW system
at Building A on May 29, 2018.
Building Pump 1 runs (Pump
2 idle, in parallel) from 68% to
90% provides daily average pressure head of 30 psig (206 kPag) to
deliver the water to the top coils of
the building and then back to primary return loop.
The PSV upstream pressure (blue
line in Figure 7) keeps a constant
pressure value of 90 psig (620 kPag),
which is regulated by pump speed
and modulation of PSV from 27% to
31% in Figure 8. Figure 8 shows the top
coil inlet pressure remains about 7.8
psig (53 kPag), while top coil outlet
pressure averages around 5.5 psig
(37 kPag).
The field operation shows that
the replacement of the pre-PSV
pumps with large capacity pumps at
Building A is not necessary because
the PSV option requires smaller
building pump capacity than prePSV. The daily field operation graphs

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S E P T E M B E R 2 0 19

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ASHRAE Journal - September 2019

Table of Contents for the Digital Edition of ASHRAE Journal - September 2019

Contents
ASHRAE Journal - September 2019 - Intro
ASHRAE Journal - September 2019 - Cover1
ASHRAE Journal - September 2019 - Cover2
ASHRAE Journal - September 2019 - 1
ASHRAE Journal - September 2019 - Contents
ASHRAE Journal - September 2019 - 3
ASHRAE Journal - September 2019 - 4
ASHRAE Journal - September 2019 - 5
ASHRAE Journal - September 2019 - 6
ASHRAE Journal - September 2019 - 7
ASHRAE Journal - September 2019 - 8
ASHRAE Journal - September 2019 - 9
ASHRAE Journal - September 2019 - 10
ASHRAE Journal - September 2019 - 11
ASHRAE Journal - September 2019 - 12
ASHRAE Journal - September 2019 - 13
ASHRAE Journal - September 2019 - 14
ASHRAE Journal - September 2019 - 15
ASHRAE Journal - September 2019 - 16
ASHRAE Journal - September 2019 - 17
ASHRAE Journal - September 2019 - 18
ASHRAE Journal - September 2019 - 19
ASHRAE Journal - September 2019 - 20
ASHRAE Journal - September 2019 - 21
ASHRAE Journal - September 2019 - 22
ASHRAE Journal - September 2019 - 23
ASHRAE Journal - September 2019 - 24
ASHRAE Journal - September 2019 - 25
ASHRAE Journal - September 2019 - 26
ASHRAE Journal - September 2019 - 27
ASHRAE Journal - September 2019 - 28
ASHRAE Journal - September 2019 - 29
ASHRAE Journal - September 2019 - 30
ASHRAE Journal - September 2019 - 31
ASHRAE Journal - September 2019 - 32
ASHRAE Journal - September 2019 - 33
ASHRAE Journal - September 2019 - 34
ASHRAE Journal - September 2019 - 35
ASHRAE Journal - September 2019 - 36
ASHRAE Journal - September 2019 - 37
ASHRAE Journal - September 2019 - 38
ASHRAE Journal - September 2019 - 39
ASHRAE Journal - September 2019 - 40
ASHRAE Journal - September 2019 - 41
ASHRAE Journal - September 2019 - 42
ASHRAE Journal - September 2019 - 43
ASHRAE Journal - September 2019 - 44
ASHRAE Journal - September 2019 - 45
ASHRAE Journal - September 2019 - 46
ASHRAE Journal - September 2019 - 47
ASHRAE Journal - September 2019 - 48
ASHRAE Journal - September 2019 - 49
ASHRAE Journal - September 2019 - 50
ASHRAE Journal - September 2019 - 51
ASHRAE Journal - September 2019 - 52
ASHRAE Journal - September 2019 - 53
ASHRAE Journal - September 2019 - 54
ASHRAE Journal - September 2019 - 55
ASHRAE Journal - September 2019 - 56
ASHRAE Journal - September 2019 - 57
ASHRAE Journal - September 2019 - 58
ASHRAE Journal - September 2019 - 59
ASHRAE Journal - September 2019 - 60
ASHRAE Journal - September 2019 - 61
ASHRAE Journal - September 2019 - 62
ASHRAE Journal - September 2019 - 63
ASHRAE Journal - September 2019 - 64
ASHRAE Journal - September 2019 - 65
ASHRAE Journal - September 2019 - 66
ASHRAE Journal - September 2019 - 67
ASHRAE Journal - September 2019 - 68
ASHRAE Journal - September 2019 - 69
ASHRAE Journal - September 2019 - 70
ASHRAE Journal - September 2019 - 71
ASHRAE Journal - September 2019 - 72
ASHRAE Journal - September 2019 - 73
ASHRAE Journal - September 2019 - 74
ASHRAE Journal - September 2019 - 75
ASHRAE Journal - September 2019 - 76
ASHRAE Journal - September 2019 - 77
ASHRAE Journal - September 2019 - 78
ASHRAE Journal - September 2019 - 79
ASHRAE Journal - September 2019 - 80
ASHRAE Journal - September 2019 - 81
ASHRAE Journal - September 2019 - 82
ASHRAE Journal - September 2019 - 83
ASHRAE Journal - September 2019 - 84
ASHRAE Journal - September 2019 - 85
ASHRAE Journal - September 2019 - 86
ASHRAE Journal - September 2019 - 87
ASHRAE Journal - September 2019 - 88
ASHRAE Journal - September 2019 - Cover3
ASHRAE Journal - September 2019 - Cover4
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