Submittal Sheet

14 DKRCC.PD.AXV.A9.02 / 520H8187 © Danfoss A/S (AC-MCI/sw) 2013-11
Data sheet Thermostatic expansion valves, type TGE
4
Fig. 8
Sizing
Sizing examples (SI and US)
Refrigerant: R410A
Evaporator capacity : Q
e
= 30 kW / 8.6 TR
Evaporator with several circuits, i.e.
a valve with distributor is required
Evaporating temperature: t
e
= 0 °C/ 32 °F
p
e
= 8 bar / 116 psi
Condensing temperature: t
c
= +36 °C / 96.8 °F
p
c
= 22 bar / 319 psi
Refrigrant liquid temperature: t
l
= +26 °C / 78.8 °F
Subcooling: ∆t
sub
= 36 – 26 = 10 K /
96.8 °F –78.8 °F = 18 °F
Pressure drop ∆p
2
in the liquid distributor can also be
assumed as 1.0 bar / 14.5 psi.
The correction factor at ∆t
sub
(fsub) = 10 K /18°F is 1.07.
The correction factor at distributer (fp) = 0.96.
The corrected evaporator capacity thus
30 kW/ 8.6 TR divided by 1.07 and 0.96 = 19.2 kW /8.4 TR.
Since the capacity of the expansion valve must be equal
to or slightly higher than the corrected evaporator
capacity of 19.2 kW / 8.4 TR, a TGE 10 orice 08 giving
32 kW/ 9.1 TR would be a suitable choice (See tables
below).
EVR
SGI/SGN
DCL/DML
Q
e
p
e
~t
e
TGE
Capacity in kW. Range N: -40 °C to +10 °C. Range K: -25 °C to + 10 °C. Opening superheat sh= 4 K
R410A
Cond. temp. Capacity [kW]
Valve Orice no.
[°C] -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15
35
-40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 Valve Orice no.
5.47 6.26 7.09 7.95 8.84 9.73 10.60 11.40 12.10 12.60 12.80 12.70 TGE 10 3
7.33 8.40 9.52 10.70 11.90 13.10 14.30 15.50 16.40 17.10 17.40 17.20 TGE 10 4
10.70 12.30 13.90 15.60 17.40 19.20 21.00 22.70 24.10 25.10 25.50 25.20 TGE 10 6
14.40 16.50 18.70 21.00 23.40 25.70 28.10 30.20 32.00 33.20 33.60 33.00 TGE 10 8
16.50 18.90 21.50 24.30 27.20 30.00 32.80 35.20 37.20 38.60 39.30 39.00 TGE 10 9
21.40 24.70 28.20 31.80 35.30 38.70 41.80 44.30 46.10 46.90 46.40 44.40 TGE 10 11
21.30 24.80 28.50 32.50 36.80 41.30 45.90 50.00 54.00 58.00 59.00 59.00 TGE 20 12.5
26.40 30.70 35.30 40.40 45.80 52.00 57.00 63.00 68.00 73.00 75.00 76.00 TGE 20 16
32.40 37.60 43.10 49.00 55.00 62.00 68.00 75.00 80.00 85.00 87.00 87.00 TGE 20 20
44.80 52.00 59.00 66.00 73.00 80.00 85.00 90.00 93.00 94.00 93.00 90.00 TGE 20 21
41.50 48.10 55.00 63.00 72.00 81.00 91.00 101.00 110.00 119.00 124.00 126.00 TGE 40 26
47.00 55.00 63.00 72.00 82.00 92.00 104.00 115.00 125.00 134.00 140.00 142.00 TGE 40 30
57.00 67.00 77.00 89.00 102.00 116.00 130.00 144.00 157.00 168.00 175.00 177.00 TGE 40 40
90.00 103.00 116.00 129.00 143.00 156.00 168.00 179.00 186.00 190.00 189.00 184.00 TGE 40 42
Subcooling correction factor ‘fsub’
Subcooling [K] 2 4 10 15 20 25 30 35 40 45 50
Correction factor 0.98 1.00 1.07 1.13 1.19 1.25 1.31 1.37 1.42 1.48 1.54
Distributer correction factor*
Evaporating temp. [°C] -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15
Pressure
drop
[bar]
0 1 1 1 1 1 1 1 1 1 1 1 2
1 0.97 0.97 0.97 0.97 0.97 0.97 0.96 0.96 0.96 0.95 0.94 0.93
15 0.96 0.96 0.96 0.95 0.95 0.95 0.95 0.94 0.93 0.93 0.91 0.89
2 0.94 0.94 0.94 0.94 0.93 0.93 0.93 0.92 0.91 0.90 0.88 0.85
*calculated at 32 °C condensing temperature