Nibe CLIMATEMASTER TRT Series Installation Operation & Maintenance page 24

C l i m at e M a s t e r WAT E R - S O U R C E H E AT P U M P S
Rooftop ( TRT ) Series
R e v . : N o v e m b e r 2 1 , 2 0 2 2
ClimaDry II – General Information, Cont'd.
®
With the ClimaDry II option, return air from the space is
®
cooled by the air-to-refrigerant (evaporator) coil, and then
reheated by the water-to-air (reheat) coil to dehumidify
the air, but maintain the same space temperature (thus
operating as a dehumidifier).
20
30.0 3.8 8.7
The moisture removal capability of the heat pump
15.0 0.7 1.7
is determined by the unit's latent capacity rating.
30
Latent capacity equals Total capacity minus Sensible
22.5 1.6 3.7
capacity. Using unit performance data from submittals
30.0 3.4 7.8
(climatemaster.com) select the correct model, use your
15.0 0.6 1.4
maximum entering water temperature (EWT) and flow
40
22.5 1.2 2.8
rate to select TC and SC. For example, at 80°F [26.7°C]
EWT and 15 GPM, the moisture removal capability (latent
30.0 2.7 6.2
capacity) of a ClimateMaster TRE120 is 36.4 Mbtuh as
15.0 0.5 1.2
shown in Figure 10.
50
22.5 0.8 1.8
30.0 2.0 4.7
Dividing the latent capacity by 1,069 BTU/LB of water
vapor at 80°F DB and 67°F WB [26.7°C DB and 19.4°C
15.0 0.3 0.7
WB] moist air enthalpy, converts the amount of moisture
60
22.5 0.5 1.2
removal to pounds per hour (multiply pounds per hour by
30.0 1.7 4.0
0.4536 to obtain kg/hr). Calculations are shown in figure 10.
15.0 0.3 0.6
70
22.5 0.5 1.1
Figure 10: Example TRE120 Performance
30.0 1.6 3.8
4000 CFM Nominal (Rated) Airflow
Water/Brine
EWT
Flow PD PD
°
GPM PSI FT
F
15.0 0.2 0.5
80
22.5 0.4 1.0
30.0 1.5 3.6
15.0 0.2 0.5
85
22.5 0.4 0.9
30.0 1.5 3.5
15.0 0.1 0.3
90
22.5 0.4 0.9
30.0 1.5 3.4
15.0 0.1 0.2
100
22.5 0.3 0.8
30.0 1.4 3.3
15.0 0.1 0.2
110
22.5 0.3 0.7
30.0 1.4 3.2
15.0 0.1 0.1
120
22.5 0.3 0.7
30.0 1.3 3.0
24
Operation not recommended
145.1 92.6 6.59 167.6
144.7 90.3 6.33 166.3
143.9 88.5 6.23 165.2
143.3 93.5 7.05 167.3
144.9 93.0 6.69 167.7
145.1 92.2 6.53 167.4
139.5 92.7 7.61 165.4
142.5 93.4 7.16 167.0
143.7 93.5 6.97 167.5
134.3 90.6 8.28 162.5
138.3 92.3 7.76 164.8
140.1 92.9 7.52 165.8
128.0 87.8 9.05 158.9
132.7 90.0 8.47 161.6
135.0 90.9 8.19 162.9
Cooling - EAT 80/67°F
TC SC kW HR EER
121.2 84.8 9.93 155.1
126.2 87.0 9.28 157.9
128.7 88.1 8.97 159.3
117.6 83.2 10.43 153.2
122.6 85.4 9.75 155.9
125.2 86.6 9.41 157.3
114.0 81.7 10.92 151.3
119.1 83.9 10.21 153.9
121.7 85.0 9.87 155.3
107.0 79.1 12.02 148.0
111.8 80.9 11.25 150.2
114.4 81.9 10.87 151.5
100.5 77.2 13.24 145.6
104.8 78.4 12.40 147.1
107.2 79.1 12.00 148.1
94.8 76.6 14.59 144.6
98.5 76.9 13.67 145.1
100.5 77.2 13.23 145.6
C l i m a t e M a s t e r Wa t e r - S o u r c e H e a t P u m p s
Most ClimateMaster heat pumps have a sensible-to-total
(S/T) ratio of 0.72 to 0.82. Therefore, approximately,
25% of the cooling capacity is dedicated to latent
cooling capacity (moisture removal). When selecting
a unit with ClimaDry II, the space sensible and latent
loads should be calculated. If the unit will be used for
87.7 9.23 56.2
space cooling, a unit with at least enough capacity to
22.0 94.9 9.37 62.9
satisfy the building sensible load should be selected. If
the latent cooling load is not satisfied by the selection, a
22.9 98.4 9.44 66.2
larger unit with enough latent capacity will be required. If
23.1 100.4 9.48 68.1
the unit will be used for dehumidification purposes only,
20.3 107.2 9.62 74.4
the latent capacity is the only consideration necessary. In
21.7 111.8 9.72 78.6
this case, sensible load is immaterial.
22.2 114.3 9.77 81.0
18.3 120.4 9.90 86.6
19.9 126.0 10.02 91.8
20.6 129.1 10.09 94.7
16.2 134.1 10.20 99.3
17.8 140.8 10.35 105.5 100.5
18.6 144.5 10.44 108.9 101.4
14.1 148.3 10.52 112.4 102.3
LC = TC - SC = 121.2 - 84.8 = 36.4 Mbtuh
15.7 156.1 10.70 119.5 104.0
36,400 Btuh ÷ 1,069 = 34.1 lbs/hr (15.4 kg/hr)
16.5 160.3 10.81 123.4 105.0
Heating - EAT 70°F
HC kW HE
12.2 162.8 10.86 125.7 105.6
13.6 171.5 11.08 133.7 107.6
14.3 176.2 11.20 138.0 108.7
11.3 170.0 11.04 132.3 107.3
12.6 179.2 11.27 140.7 109.4
13.3 184.1 11.40 145.2 110.5
10.4 177.3 11.22 139.0 108.9
11.7 186.8 11.47 147.7
12.3 192.0 11.60 152.5 112.4
8.9
9.9
10.5
7.6
Operation not recommended
8.5
8.9
6.5
7.2
7.6
88.3 2.8
89.9 3.0
90.7 3.1
91.2 3.1
92.8 3.3
93.8 3.4
94.4 3.4
95.8 3.6
97.1 3.7
97.8 3.7
99.0 3.9
4.0
4.1
4.1
4.3
4.3
LAT COP
Dividing the latent
4.4
capacity by 1,069 BTU/
LB of water vapor at
4.5
80°F DB and 67°F WB
4.6
[26.7°C DB and 19.4°C
4.5
WB] moist air enthalpy,
4.7
converts the amount
of moisture removal to
4.7
pounds per hour (multiply
4.6
pounds per hour by
111.1 4.8
0.4536 to obtain kg/hr).
4.9
Calculations are shown in
Figure 10.