Methods To Size Hrvs; Heating Load Btu; Additional Heating And Cooling Load Charts - Bryant HRVBBLHA Product Data

Physical data (continued)
Model
Capacity—CFM @
0.5-0.3ESP (in. wc)
Efficiency (Sensible)—Percent Efficiency (Sensible) Percent
32_F (0_ C)
-- 13_F (-- 25_ C)
Efficiency (Latent)—Percent
@ all temperatures
Heat Core Exchange Area—
cu ft (cu m)
Model
Voltage
Max Power — watts
Max Amps

Methods to Size HRVs

Method 1:
1. Calculate cubic feet of occupied space
2. Multiply by recommended air changes per hour (AC/h)
3. Divide by 60 minutes per hour to convert to CFM
Example: 2000 sq ft with 8 ft ceiling
0.35 air changes per hour (AC/h)
(2000 sq ft x 8 ft ceiling x 0.35 AC/h) / 60 min/h =
93.3 CFM
Method 2:
1. Multiply number of people times 15 CFM/person
2. Multiply number of bathrooms times 20 CFM/each
3. Add 25 CFM for kitchen
Example: 2 people
2 bathrooms
1 kitchen
(2 x 15) + (2 x 20) + 25 = 95 CFM

Additional heating and cooling load charts

Although the ventilators process the outside air before it enters
the home, additional heating and cooling loads need to be
considered.
HRVBBLHA1150 HRVBBLHA1250
130--- 168 191--- 210
65 65 65 65
65 60
0 0
120 (3.4) 166 (4.7)
HRVBBLHA1150 HRVBBLHA1250
120 120
150 218
1.4 1.9

HEATING LOAD BTU

The heating load chart shows the heating loads in BTUh for a
range of winter design temperatures for each model of ventilator.
EXAMPLE: The heating design temperature for Milwaukee,
WI, is - -4_F. At - -5_F, the additional heating load of the
HRVBBLHA1250 is 8417 BTUh. This additional load should be
taken into consideration when sizing the heating equipment.
7
HRVBBSVA1100 HRVBBSHA1100
99--- 107 99--- 107
66 66 66 66
66 66
0 0
55 (5.1) 55 (5.1)
HRVBBSVA1100 HRVBBSHA1100
120 120
150 150
1.3 1.3
Heat Load (BTUh)
Outside Temp
@ Inside Design
Temp 72°F
°F
HRVBBLHA1150
–25 4,688
–20 4,466
–15 4,598
–10 4,334
–5 4,069
0 3,805
5 3,541
10 3,502
15 3,220
20 2,938
25 2,950
30 2,636
35 2,322
2,009
40