Bryant A07619 Heating And Cooling Load Charts, Heating Load Btuh, Cooling Load Btuh, Ervbblha

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

Outside		Heating Load (Btuh) @
		Inside Design Temp 72°F
Temp °F
	ERV150	ERV200	HRV150	HRV250
–25	5186	8143	6636	10603
–20	4919	7723	6294	10057
–15	5075	7967	5952	9510
–10	4783	7509	5610	8964
–5	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

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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