Plenum Heater Sizing; Table 7 - Evaporation Rate Chart (50% Rh); Table 8 - Evaporation Rate Chart (60% Rh); Table 9 - Plenum Heater Sizing - Maritime Geothermal Nordic PC Series Installation And Service Manual

86
0.034
78
0.042
80
0.048
82
0.056
84
0.062
86
0.072
88
Pool
0.080
90
Water
Temp.
92 0.090
(Tp) °F
0.098
94
0.110
96
98 0.120
0.132
100
0.144
102
0.156
104
86
0.020
78
0.026
80
0.034
82
0.040
84
86 0.048
0.058
88
Pool
0.066
90
Water
Temp.
0.074
92
(Tp) °F
0.084
94
0.094
96
0.106
98
100 0.118
0.130
102
0.142
104
3) Airflow across pool surface: Increased airflow across
the surface area of the pool increases the evaporation rate.
Ducting should de designed to minimize the airflow across
the pool to reduce this effect. See the
more information.
4) Room air temperature: As mentioned in (1), the pool room
temperature is normally kept slightly above the water
temperature to minimize the amount of evaporation taking
place.
5) Room relative humidity: The relative humidity setpoint for
most pool areas is from 50% to 60%. Lowering the relative
humidity setpoint will increase the evaporation rate from the
pool thus causing the pool conditioner to run more, but may
be necessary to prevent condensation on some glass
surfaces during cold weather. Relative humidity should be
set only low enough to prevent condensation from occurring
on windows and doors.
TABLE 3 gives a step by step explanation of how to
determine the evaporation rate of the pool. Once the Pool
Evaporation Rate (ERp) has been calculated then it can be
ISSUE 03: 1-Oct-2021
TABLE 7 - Evaporation Rate Chart (50% RH) – lb/hr/ft
Air Temperature (Ta) °F
85 84 83
0.036 0.038 0.038
0.044 0.046 0.046 0.048*
0.050 0.052 0.052
0.058 0.060 0.060
0.066 0.068 0.068
0.074 0.076 0.076
0.082 0.084 0.084
0.092 0.094 0.094
0.102 0.104 0.104
0.112 0.114 0.114
0.122 0.124 0.124
0.134 0.136 0.136
0.146 0.148 0.148
0.158 0.160 0.160
TABLE 8 - Evaporation Rate Chart (60% RH) – lb/hr/ft
Air Temperature (Ta) °F
85 84 83
0.022 0.026 0.028 0.030
0.030 0.032 0.034 0.036*
0.036 0.038 0.042 0.044
0.044 0.046 0.048 0.050
0.052 0.054 0.056 0.060
0.060 0.062 0.064 0.066
0.068 0.070 0.074 0.076
0.078 0.080 0.082 0.084
0.088 0.090 0.092 0.094
0.098 0.100 0.102 0.104
0.108 0.112 0.114 0.116
0.120 0.122 0.124 0.128
0.132 0.134 0.136 0.140
0.144 0.146 0.150 0.152
Ductwork section for
82 81 80
0.040 0.042 0.044 0.046
0.050 0.050 0.052
0.054 0.056 0.058 0.060
0.062 0.064 0.066 0.068
0.070 0.072 0.074 0.076
0.078 0.080 0.082 0.084
0.086 0.088 0.090 0.092
0.096 0.098 0.100 0.100
0.106 0.108 0.108 0.110
0.116 0.118 0.120 0.120
0.126 0.128 0.130 0.132
0.138 0.140 0.142 0.144
0.150 0.152 0.154 0.156
0.162 0.164 0.166 0.168
82 81 80
0.032 0.034 0.036
0.038 0.040 0.044
0.046 0.048 0.050
0.054 0.056 0.058
0.060 0.064 0.066
0.070 0.072 0.074
0.078 0.080 0.082
0.088 0.090 0.092
0.096 0.098 0.100
0.106 0.110 0.112
0.118 0.120 0.122
0.130 0.132 0.134
0.142 0.144 0.146
0.154 0.156 0.158
matched to the moisture removal for a particular PC model size
in TABLE 4 or 5
to selected RHna).
TABLE 4
pool that can be accommodated by each model size for a typical
residential installation. This is just a guideline; the Pool Evapo-
ration Rate (ERp) should be calculated as per

Plenum Heater Sizing

Plenum heaters are available as accessories in 5, 7, 10,
15 and 20kW sizes. Choose a size that matches a heat load
calculation for the pool room, or if that is not available, use the
following recommendation:

TABLE 9 - Plenum Heater Sizing

MODEL
PC-45, 55
PC-65, 75, 80
Page 9
2
79 78 77
0.048 0.050 0.052
0.054 0.056 0.058
0.062 0.064 0.066
0.070 0.070 0.072
0.076 0.078 0.080
0.086 0.086 0.088
0.094 0.096 0.098
0.102 0.104 0.106
0.112 0.114 0.116
0.122 0.124 0.126
0.134 0.136 0.138
0.146 0.148 0.148
0.158 0.158 0.160
0.170 0.172 0.174
2
79 78 77
0.038 0.040 0.042
0.046 0.048 0.050
0.052 0.054 0.056
0.060 0.062 0.064
0.068 0.070 0.072
0.076 0.078 0.080
0.084 0.086 0.088
0.094 0.096 0.098
0.104 0.106 0.108
0.114 0.116 0.118
0.124 0.126 0.128
0.136 0.138 0.140
0.148 0.150 0.152
0.160 0.162 0.164
(looking in the 50% or 60% columns according
or 5 also gives a general idea as to the size of
kW
15
20
76
* value for
recommend-
ed setpoints
76
* value for
recommend-
ed setpoints
TABLE 3.
002291MAN-03