Bryant 581A/B manual Cooling CAPACITIES, Units with HOT GAS Reheat Option

PERFORMANCE DATA (cont)

COOLING CAPACITIES, UNITS WITH HOT GAS REHEAT OPTION

581A181 (15 TONS) UNIT WITH HOT GAS REHEAT IN COOLING MODE

Temp (F)												Air Entering Evaporator — Cfm/BF
Air Entering				4500/0.02						5250/0.03						6000/0.04					6750/0.04						7500/0.05
Condenser												Air Entering Evaporator — Ewb (F)
(Edb)
			57		62	67	72	57		62	67	72		57		62	67	72	57		62		67	72	57		62		67	72
75		TC	166		179	193	214	175		186	202	221		183		191	208	227	190		195		212	232	197		199		216	236
		SHC	165		152	129	108	175		166	140	115		183		178	150	121	190		189		159	127	197		196		168	133
		kW	10.4		10.6	10.7	10.9	10.5		10.6	10.8	11.0		10.6		10.7	10.9	11.1	10.7		10.7		10.9	11.2	10.8		10.8		11.0	11.2
85		TC	162		174	189	209	171		180	195	216		179		185	200	222	186		189		205	226	192		194		208	230
		SHC	162		150	127	106	171		163	137	113		179		175	147	119	186		185		156	125	192		192		164	131
		kW	11.7		11.9	12.1	12.3	11.8		12.0	12.1	12.4		11.9		12.0	12.2	12.5	12.0		12.1		12.3	12.5	12.1		12.1		12.3	12.6
95		TC	158		169	182	202	166		174	187	209		174		179	194	214	181		183		198	218	187		188		201	221
		SHC	158		148	126	104	166		160	134	110		174		172	145	116	181		180		154	122	187		187		163	128
		kW	12.7		12.9	13.1	13.3	12.9		13.0	13.2	13.4		13.0		13.0	13.2	13.5	13.1		13.1		13.3	13.6	13.1		13.2		13.4	13.6
105		TC	153		163	178	195	162		168	181	201		169		172	188	206	175		177		191	209	181		181		194	213
		SHC	153		145	123	101	162		157	133	107		169		167	142	113	175		175		151	119	181		181		160	125
		kW	14.1		14.2	14.4	14.7	14.2		14.3	14.5	14.8		14.3		14.3	14.6	14.8	14.4		14.4		14.6	14.9	14.5		14.5		14.7	14.9
115		TC	148		156	171	188	157		161	176	193		163		165	180	197	169		170		183	201	174		175		185	203
		SHC	148		141	120	98	157		153	130	104		163		162	139	110	169		169		148	116	174		174		156	122
		kW	15.5		15.6	15.8	16.1	15.6		15.7	15.9	16.2		15.7		15.8	16.0	16.3	15.8		15.8		16.1	16.3	15.9		15.9		16.1	16.4
125		TC	143		149	163	179	151		153	168	184		157		158	171	188	163		163		174	190	167		167		176	192
		SHC	143		138	117	95	151		149	126	101		157		156	136	107	163		163		144	112	167		167		153	118
		kW	17.0		17.1	17.4	17.7	17.2		17.2	17.5	17.8		17.3		17.3	17.6	17.8	17.4		17.4		17.6	17.9	17.5		17.5		17.6	17.9
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A IN REHEAT, B AND C OFF
Temp (F)													Evaporator Air Quantity — Cfm/BF
Air Entering				4500/0.12						5250/0.14						6000/.015					6750/0.18						7500/0.18
Condenser												Evaporator Air — Relative Humidity (%)
	(Edb)
				50		55	60		50		55	60			50		55	60		50		55		60		50		55		60
		TC		55		57	59		56		58	59			56		58	60		57		59		60		57		59		61
65		SHC		34		32	30		36		34	32			37		35	33		38		36		35		40		38		36
		kW		4.4		4.5	4.5		4.4		4.5	4.5			4.4		4.5	4.5		4.4		4.5		4.5		4.4		4.5		4.5
		TC		42		44	45		43		44	46			43		45	46		43		45		46		44		45		47
75		SHC		22		19	17		23		21	18			25		22	20		26		24		21		28		25		23
		kW		4.8		4.8	4.8		4.8		4.8	4.8			4.8		4.8	4.8		4.8		4.8		4.8		4.8		4.8		4.8
		TC		29		30	31		29		31	32			30		31	32		30		32		33		31		32		33
85		SHC		9		6	3		11		8	5			13		10	7		14		11		8		16		12		9
		kW		5.2		5.2	5.3		5.2		5.2	5.3			5.2		5.2	5.3		5.2		5.2		5.3		5.2		5.2		5.3
		TC		15		16	17		16		17	18			16		18	18		17		18		19		17		18		19
95		SHC		–3		–7	–11		–1		–5	–9			1		–3	–7		2		–2		–5		4		0		–4
		kW		5.6		5.6	5.6		5.6		5.6	5.6			5.6		5.6	5.6		5.6		5.6		5.6		5.6		5.6		5.6
581A181 (15 TONS) UNIT WITH HOT GAS REHEAT — A AND B IN REHEAT, C OFF
Temp (F)													Evaporator Air Quantity — Cfm/BF
Air Entering				4500/0.12						5250/0.14						6000/.015					6750/0.18						7500/0.18
Condenser												Evaporator Air — Relative Humidity (%)
	(Edb)
				50		55	60		50		55	60			50		55	60		50		55		60		50		55		60
		TC		81		84	86		82		85	87			83		86	88		84		87		89		85		87		90
65		SHC		34		32	30		36		33	31			37		35	33		39		36		34		40		38		36
		kW		7.8		7.9	7.9		7.8		7.9	7.9			7.8		7.9	7.9		7.8		7.9		7.9		7.8		7.9		7.9
		TC		62		64	66		62		65	67			63		66	68		64		66		68		64		67		69
75		SHC		22		19	16		24		21	18			25		22	20		27		24		21		28		25		22
		kW		8.5		8.5	8.5		8.5		8.5	8.5			8.5		8.5	8.5		8.5		8.5		8.5		8.5		8.5		8.5
		TC		42		44	46		43		45	46			43		45	47		44		46		48		44		46		48
85		SHC		10		6	2		12		8	4			14		10	6		15		11		8		16		13		9
		kW		9.2		9.2	9.3		9.2		9.2	9.3			9.2		9.2	9.3		9.2		9.2		9.3		9.2		9.2		9.3
		TC		23		24	26		23		25	26			24		25	27		24		26		27		24		26		27
95		SHC		–2		–7	–11		0		–5	–9			2		–3	–7		3		–1		–6		5		0		–4
		kW		9.9		9.9	9.9		9.9		9.9	9.9			9.9		9.9	9.9		9.9		9.9		9.9		9.9		9.9		9.9

		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)

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.

			Correction Factor				581A155
BYPASS		ENTERING AIR DRY-BULB TEMP (F)
FACTOR	79	78	77	76	75	under 75
(BF)	81	82	83	84	85	over 85
							-300
.05	1.04	2.07	3.11	4.14	5.18	Use for-
.10	.98	1.96	2.94	3.92	4.90	mula
.20	.87	1.74	2.62	3.49	4.36	shown
.30	.76	1.53	2.29	3.05	3.82	below.

Interpolation is permissible.

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

total capacity (Btuh)

hlwb = hewb –4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil

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