Bryant 581A/B manual Cooling Capacities Standard Units, Entering WET-BULB F CFM

PERFORMANCE DATA

COOLING CAPACITIES — STANDARD UNITS

581A155 (12 Tons)

Temp (F)												Evap Air — Cfm/BF
					3600/0.01								4375/0.01								5000/0.01
Air Ent
												Evap Air — Ewb (F)
Cond
		54	58	62		67	72	76	80	54	58	62		67	72	76	80	54	58	62		67	72	76	80
	TC	152	156	161		174	189	201	213	161	164	167		180	195	207	218	169	171	172		184	199	211	222
60	SHC	152	144	135		114	92.9	75.4	57.5	161	156	150		125	99.6	78.7	57.5	169	166	162		134	105	81.3	57.4
	kW	7.56	7.65	7.74		8.01	8.33	8.6	8.86	7.76	7.82	7.88		8.14	8.46	8.72	8.97	7.92	7.95	7.98		8.24	8.55	8.82	9.06
	TC	148	152	156		169	183	195	206	157	160	162		174	189	200	211	165	166	167		179	193	204	214
70	SHC	148	141	133		112	90.6	73.2	55.4	157	153	148		123	97.3	76.5	55.3	165	162	160		132	103	79.1	55.3
	kW	8.5	8.58	8.67		8.97	9.26	9.53	9.8	8.7	8.75	8.81		9.07	9.39	9.66	9.91	8.86	8.89	8.91		9.16	9.49	9.76	9.99
	TC	146	150	154		166	181	192	204	155	158	160		172	186	197	208	163	164	164		176	189	201	212
75	SHC	146	139	132		111	89.7	72.2	54.6	155	151	146		122	96.2	75.5	54.6	163	161	158		131	101	78.1	54.5
	kW	9.02	9.1	9.18		9.45	9.8	10.1	10.4	9.22	9.27	9.31		9.58	9.91	10.2	10.5	9.39	9.41	9.43		9.68	9.99	10.3	10.6
	TC	142	145	149		161	175	186	196	151	153	154		166	179	190	200	158	159	159		170	183	194	203
85	SHC	142	136	129		109	87.4	70	52.4	151	147	144		119	93.9	73.2	52.3	158	157	155		128	99.1	75.8	52.2
	kW	10.1	10.2	10.3		10.6	10.9	11.2	11.5	10.3	10.4	10.4		10.7	11	11.3	11.6	10.5	10.5	10.5		10.8	11.1	11.4	11.7
	TC	138	141	143		155	168	179	189	147	148	149		160	173	183	192	153	153	154		164	177	187	195
95	SHC	138	133	127		106	85	67.7	50.1	147	144	141		117	91.6	70.9	50	153	153	152		126	96.9	73.5	49.9
	kW	11.4	11.4	11.5		11.8	12.2	12.4	12.7	11.6	11.6	11.6		11.9	12.3	12.6	12.8	11.8	11.8	11.8		12	12.4	12.7	12.9
	TC	134	136	138		149	162	172	181	141	142	143		153	166	176	184	148	148	148		157	169	179	186
105	SHC	134	129	124		104	82.4	65.3	47.7	141	139	137		114	89	68.4	47.5	148	148	148		123	94.3	70.9	47.4
	kW	12.7	12.8	12.8		13.2	13.5	13.8	14.1	12.9	13	13		13.3	13.6	13.9	14.2	13.1	13.1	13.1		13.4	13.7	14	14.3
	TC	129	130	132		143	155	164	172	136	137	138		146	158	168	175	142	142	142		149	161	171	177
115	SHC	129	125	121		101	79.8	62.7	45.1	136	135	133		111	86.3	65.9	45	142	142	142		120	91.6	68.4	45
	kW	14.2	14.2	14.3		14.6	15	15.3	15.6	14.4	14.4	14.5		14.7	15.1	15.5	15.7	14.6	14.6	14.6		14.8	15.2	15.6	15.7
	TC	124	125	126		136	147	156	163	131	131	132		140	150	159	165	136	136	136		142	153	162	167
125	SHC	124	121	118		98.2	77	60.1	42.5	131	130	128		109	83.5	63.2	42.5	136	136	136		117	88.7	65.7	42.4
	kW	15.8	15.8	15.9		16.2	16.6	17	17.2	16.1	16.1	16.1		16.4	16.7	17.1	17.3	16.3	16.2	16.2		16.4	16.8	17.2	17.4
581A155 (12 Tons) (cont)
Temp (F)								Evap Air — Cfm/BF
					5625/0.02								6250/0.02
Air Ent
								Evap Air — Ewb (F)
Cond
		54	58	62		67	72	76	80	54	58	62		67	72	76	80
	TC	175	175	176		187	202	214	224	180	180	180		190	204	216	226
60	SHC	175	173	171		142	110	83.8	57.3	180	180	180		151	115	86.2	57.2
	kW	8.03	8.05	8.07		8.3	8.61	8.87	9.1	8.14	8.15	8.16		8.36	8.66	8.93	9.14
	TC	170	171	171		181	195	207	216	175	176	176		184	198	209	218
70	SHC	170	169	168		140	108	81.5	55.2	175	176	176		148	113	84	55.1
	kW	8.98	8.99	9.01		9.23	9.55	9.81	10	9.09	9.1	9.11		9.3	9.61	9.87	10.1
	TC	168	168	169		179	192	203	213	173	173	173		181	195	206	215
75	SHC	168	167	166		139	107	80.5	54.4	173	173	173		147	112	83	54.3
	kW	9.5	9.51	9.52		9.75	10.1	10.3	10.6	9.62	9.62	9.62		9.81	10.1	10.4	10.6
	TC	163	163	164		172	185	196	205	168	168	168		175	188	198	206
85	SHC	163	162	162		136	104	78.2	52.2	168	168	168		145	109	80.6	52.1
	kW	10.6	10.6	10.6		10.9	11.2	11.5	11.7	10.7	10.7	10.8		10.9	11.2	11.5	11.8
	TC	158	158	158		166	178	189	196	162	162	162		168	180	190	197
95	SHC	158	157	157		134	102	75.9	49.8	162	162	162		142	107	78.3	49.7
	kW	11.9	11.9	11.9		12.1	12.4	12.7	12.9	12	12	12		12.1	12.5	12.8	13
	TC	152	152	152		159	171	181	187	157	157	157		161	173	182	188
105	SHC	152	152	152		131	99.3	73.3	47.4	157	157	157		139	104	75.7	47.4
	kW	13.2	13.2	13.2		13.4	13.8	14.1	14.3	13.4	13.4	13.4		13.5	13.9	14.2	14.4
	TC	146	146	146		151	163	172	177	150	150	150		153	165	174	178
115	SHC	146	146	146		128	96.6	70.7	44.9	150	150	150		136	102	73.1	44.8
	kW	14.7	14.7	14.7		14.9	15.3	15.6	15.8	14.9	14.9	14.9		14.9	15.4	15.7	15.8
	TC	140	140	140		144	155	163	167	144	144	144		146	156	164	168
125	SHC	140	140	140		125	93.7	67.9	42.4	144	144	144		133	98.7	70.2	42.3
	kW	16.4	16.4	16.4		16.5	16.9	17.2	17.4	16.5	16.5	16.5		16.6	17	17.3	17.4

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:

tldb	= tedb –			sensible capacity (Btuh)
					1.10 x cfm
tlwb	= Wet-bulb temperature corresponding to enthalpy of air leaving evapo-
		rator coil (hlwb)
hlwb		= hewb	–		total capacity (Btuh)
					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
.10	.98	1.96	2.94	3.92	4.90	Use formula
.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).

4. Use chart below for bypass factor.

			ENTERING WET-BULB (F)
CFM	54	58	62	67	72	76	80
			Bypass Factor
3600	0.355	0.158	0.054	0.038	0.049	0.000	0.000
4375	0.439	0.255	0.112	0.043	0.057	0.000	0.000
5000	0.486	0.314	0.126	0.054	0.037	0.000	0.000
5625	0.525	0.360	0.174	0.066	0.073	0.000	0.000
6250	0.551	0.410	0.202	0.080	0.079	0.000	0.000

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