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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.
ERVBBLHA
HEATING LOAD BTUH
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Outside |
| Heating Load (Btuh) @ |
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| Inside Design Temp 72°F |
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Temp °F |
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ERV150 | ERV200 | HRV150 | HRV250 | ||
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5186 | 8143 | 6636 | 10603 | ||
4919 | 7723 | 6294 | 10057 | ||
5075 | 7967 | 5952 | 9510 | ||
4783 | 7509 | 5610 | 8964 | ||
4491 | 7051 | 5268 | 8417 | ||
0 | 4200 | 6594 | 4925 | 7871 | |
5 | 4234 | 6647 | 4583 | 7324 | |
10 | 3918 | 6151 | 4241 | 6777 | |
15 | 3958 | 6214 | 3899 | 6231 | |
20 | 3611 | 5669 | 3557 | 5684 | |
25 | 3264 | 5124 | 3215 | 5138 | |
30 | 2916 | 4579 | 2873 | 4591 | |
35 | 2569 | 4034 | 2531 | 4045 | |
40 | 2222 | 3489 | 2189 | 3498 |
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 Little Rock, AR is 20_F. The additional heating load of the ERVBBLHA1200 at 20_F is 559 Btuh. This additional load should be taken into consideration when sizing the heating equipment.
COOLING LOAD BTUH
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Outside | Cooling Load (Btuh) @ Inside Design Temp | |||
Enthalpy | 72°F and 50% Relative Humidity | |||
Btu/lb | ERV150 | ERV200 | HRV150 | HRV250 |
30 | 380 | 640 | 670 | 1071 |
31 | 618 | 1040 | 1090 | 1741 |
32 | 855 | 1441 | 1509 | 2411 |
33 | 1093 | 1841 | 1928 | 3080 |
34 | 1331 | 2241 | 2347 | 3750 |
35 | 1568 | 2641 | 2766 | 4419 |
36 | 1806 | 3041 | 3185 | 5089 |
37 | 2043 | 3441 | 3604 | 5759 |
38 | 2281 | 3842 | 4023 | 6428 |
39 | 2519 | 4242 | 4442 | 7098 |
40 | 2756 | 4642 | 4861 | 7767 |
41 | 2994 | 5042 | 5280 | 8437 |
42 | 3231 | 5442 | 5699 | 9107 |
The cooling load chart shows loads in Btuh as well. To use the cooling load chart, first find the design enthalpy from a psychrometric chart using the design dry bulb and wet bulb temperatures. (See pg. 7.) The cooling load can then be found for a range of enthalpies for each ventilator.
EXAMPLE: The design dry bulb temperature for Miami is 90_F and the average wet bulb at that temperature is 77_F. Using the psychrometric chart, the enthalpy is about 40.5 Btu per pound (Btu/lb) of dry air, which would round up to 41 Btu/lb dry air. In the left column, at 41 Btu/lb dry air, the ERVBBLHA1200 has an additional cooling load of 5042 Btuh, while the HRV150CFM unit has an additional cooling load of 8437 Btuh.
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