Bryant 581A/B manual 216

PERFORMANCE DATA (cont)

COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION (cont)

581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF

Temp (F)								Evaporator Air Quantity — Cfm/BF
Air Entering				6000/0.04			7000/0.05			8000/0.06			9000/0.07			10,000/0.08
Condenser								Evaporator Air — Relative Humidity (%)
	(Edb)
			50	55	60	50	55	60	50	55	60	50	55	60	50		55	60
		TC	73	75	77	73	76	78	74	76	79	75	77	79	75		78	80
65		SHC	45	42	40	47	44	42	49	47	44	51	48	46	53		50	48
		kW	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1		6.1	6.1
		TC	55	57	59	56	58	60	56	58	60	57	59	61	57		59	61
75		SHC	29	25	22	31	27	24	33	30	26	35	31	28	37		33	30
		kW	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6	6.6		6.6	6.6
		TC	38	40	41	38	40	42	39	40	42	39	41	42	39		41	43
85		SHC	13	8	4	15	10	7	17	13	9	19	14	10	21		16	12
		kW	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2	7.2		7.2	7.2
		TC	20	22	23	21	22	24	21	22	24	21	23	24	21		23	24
95		SHC	–4	–9	–14	–1	–7	–11	1	–4	–9	3	–3	–7	5		–1	–6
		kW	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7	7.7		7.7	7.7
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C OFF
Temp (F)								Evaporator Air Quantity — Cfm/BF
Air Entering				6000/0.04			7000/0.05			8000/0.06			9000/0.07			10,000/0.08
Condenser								Evaporator Air — Relative Humidity (%)
	(Edb)
			50	55	60	50	55	60	50	55	60	50	55	60	50		55	60
		TC	106	110	113	108	111	114	109	113	116	110	114	117	111		115	118
65		SHC	45	42	39	47	44	41	49	46	44	51	48	46	53		50	47
		kW	10.7	10.7	10.8	10.7	10.7	10.8	10.7	10.7	10.8	10.7	10.7	10.8	10.7		10.7	10.8
		TC	81	84	87	82	85	88	83	86	89	83	87	89	84		87	90
75		SHC	29	25	21	31	27	24	34	29	26	36	31	28	37		33	30
		kW	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6	11.6		11.6	11.6
		TC	56	58	61	56	59	61	56	59	61	57	59	62	57		60	62
85		SHC	13	8	3	16	10	6	18	13	8	20	15	10	22		16	12
		kW	12.6	12.7	12.7	12.6	12.7	12.7	12.6	12.7	12.7	12.6	12.7	12.7	12.6		12.7	12.7
		TC	30	33	34	30	32	34	30	32	34	30	32	34	30		32	34
95		SHC	–3	–9	–14	0	–6	–12	2	–4	–10	4	–2	–8	6		0	–6
		kW	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6	13.6		13.6	13.6
581A240 (20 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C ON
Temp (F)								Evaporator Air Quantity — Cfm/BF
Air Entering				6000/0.04			7000/0.05			8000/0.06			9000/0.07			10,000/0.08
Condenser								Evaporator Air — Relative Humidity (%)
	(Edb)
			50	55	60	50	55	60	50	55	60	50	55	60	50		55	60
		TC	177	185	191	177	185	192	178	186	192	178	186	193	178		186	193
65		SHC	98	92	86	100	94	88	101	95	90	103	97	92	104		98	93
		kW	14.5	14.6	14.7	14.5	14.6	14.7	14.5	14.6	14.7	14.5	14.6	14.7	14.5		14.6	14.7
		TC	154	161	168	154	162	169	155	162	169	155	163	169	155		163	170
75		SHC	81	73	66	83	75	69	85	78	71	87	80	73	89		81	75
		kW	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1	16.1		16.1	16.1
		TC	131	138	145	131	139	145	131	139	146	132	139	146	132		140	146
85		SHC	63	54	46	66	57	49	69	60	52	71	62	54	73		64	56
		kW	17.7	17.7	17.8	17.7	17.7	17.8	17.7	17.7	17.8	17.7	17.7	17.8	17.7		17.7	17.8
		TC	107	115	122	108	115	122	108	116	122	108	116	123	109		116	123
95		SHC	46	35	25	50	39	29	53	42	32	55	45	35	58		47	38
		kW	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3	19.3		19.3	19.3

581A155-300

		LEGEND
BF	— Bypass Factor
Edb	—	Entering Dry-Bulb
Ewb —		Entering Wet-Bulb
kW	—	Compressor Motor Power Input
ldb	—	Leaving Dry-Bulb
lwb	—	Leaving Wet-Bulb
SHC —		Sensible Heat Capacity (1000 Btuh) Gross
TC	—	Total Capacity (1000 Btuh) Gross

NOTES:

1.Direct interpolation is permissible. Do not extrapolate.

2.The following formulas may be used:

sensible capacity (Btuh)

tldb = tedb –1.10 x cfm

tlwb = Wet-bulb temperature corresponding to enthalpy of air leaving evapo- rator coil (hlwb)

total capacity (Btuh)

hlwb = hewb –4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil

3.The SHC is based on 80 F edb temperature of air entering evaporator coil. Below 80 F edb, subtract (corr factor x cfm) from SHC.

Above 80 F edb, add (corr factor x cfm) to SHC.

BYPASS		ENTERING AIR DRY-BULB TEMP (F)
	79	78	77		76	75	under 75
FACTOR
	81	82	83		84	85	over 85
(BF)
				Correction Factor
.05	1.04	2.07	3.11		4.14	5.18	Use formula
.10	.98	1.96	2.94		3.92	4.90
.20	.87	1.74	2.62		3.49	4.36	shown below.
.30	.76	1.53	2.29		3.05	3.82

Interpolation is permissible.

Correction Factor = 1.10 x (1 – BF) x (edb – 80).

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