Bryant 581A/B manual 156

PERFORMANCE DATA — 579F (cont)

COOLING CAPACITIES (cont)

	579F240 (20 Tons)
	Temp (F)							Evaporator Air Quantity — Cfm
	Air Entering					6,000							7,000
	Condenser							Evaporator Air — Ewb (F)/BF
	(Edb)
			54/0.48	58/0.31	62/0.21	67/0.19	72/0.17	76/0.22	80/0.05	54/0.54	58/0.37	62/0.25	67/0.21	72/0.19	76/0.21	80/0.04
		TC	217	222	232	252	274	294	316	227	231	238	254	281	297	322
	75	SHC	217	199	189	163	136	112	90	227	217	202	172	143	115	91
		kW	15.1	15.2	15.4	15.8	16.2	16.6	17.0	15.3	15.4	15.5	15.9	16.4	16.5	17.2
		TC	212	217	226	244	266	285	306	222	225	231	250	272	291	312
	85	SHC	212	194	185	159	133	109	87	222	211	198	170	140	113	88
		kW	16.9	17.2	17.3	17.6	18.0	18.4	18.8	17.1	17.3	17.3	17.7	18.2	18.6	19.0
		TC	206	208	217	236	257	276	295	215	216	223	241	262	281	301
	95	SHC	206	197	181	156	129	106	84	215	213	194	166	136	110	84
		kW	18.9	18.8	19.0	19.5	20.0	20.4	20.8	19.0	19.0	19.2	19.6	20.1	20.5	21.0
		TC	199	202	209	227	247	265	285	208	209	215	232	252	270	—
	105	SHC	199	190	177	152	126	103	80	208	209	189	163	132	107	—
		kW	20.8	20.9	21.1	21.6	22.0	22.5	22.9	21.0	21.0	21.2	21.7	22.2	22.6	—
		TC	192	194	200	218	237	254	—	202	202	207	222	242	259	—
	115	SHC	192	192	173	149	122	99	—	202	202	183	159	129	103	—
		kW	23.0	22.9	23.3	23.8	24.3	24.8	—	23.2	23.2	23.5	23.9	24.5	24.9	—
		TC	191	191	199	216	235	252	—	200	200	205	220	240	257	—
	117	SHC	191	191	172	148	121	99	—	200	200	182	158	128	102	—
		kW	23.5	23.5	23.7	24.2	24.8	25.2	—	23.8	23.8	23.9	24.4	24.9	25.3	—
		TC	189	189	196	213	232	249	—	197	198	203	217	236	—	—
	120	SHC	189	189	170	147	120	98	—	197	198	181	156	127	—	—
		kW	24.2	24.2	24.4	25.0	25.5	25.9	—	24.5	24.5	24.6	25.1	25.6	—	—
	579F240 (20 Tons) (cont)
	Temp (F)							Evaporator Air Quantity — Cfm
	Air Entering					8,000							9,000
300-	Condenser							Evaporator Air — Ewb (F)/BF
	(Edb)
			54/0.58	58/0.43	62/0.30	67/0.23	72/0.21	76/0.22	80/0.04	54/0.62	58/0.48	62/0.35	67/0.24	72/0.23	76/0.23	80/0.04
579F180	75	TC	236	238	241	259	286	302	328	244	244	250	267	290	307	—
		kW	17.5	17.3	17.4	17.8	18.3	18.7	—	17.5	17.6	17.6	18.0	18.4	18.8	—
		SHC	236	232	211	181	149	119	91	244	244	222	192	155	123	—
		kW	15.5	15.5	15.6	15.9	16.5	16.6	17.3	15.7	15.7	15.8	16.1	16.6	16.7	—
		TC	231	230	237	254	276	296	—	237	238	243	258	281	300	—
	85	SHC	231	230	209	179	146	117	—	237	238	216	189	152	121	—
		TC	223	223	229	245	267	285	—	231	230	235	249	270	289	—
	95	SHC	223	223	203	176	142	114	—	231	230	209	185	148	117	—
		kW	19.2	19.2	19.3	19.8	20.2	20.6	—	19.5	19.4	19.5	19.8	20.3	20.8	—
		TC	216	216	221	236	256	274	—	222	223	228	239	260	278	—
	105	SHC	216	216	197	172	139	110	—	222	223	202	181	145	114	—
		kW	21.3	21.3	21.4	21.8	22.3	22.7	—	21.4	21.5	21.6	21.9	22.4	22.8	—
		TC	208	209	213	226	246	263	—	214	214	220	229	249	266	—
	115	SHC	208	209	190	168	135	107	—	214	214	193	177	141	110	—
		kW	23.5	23.5	23.7	24.0	24.6	25.0	—	23.7	23.7	23.9	24.2	24.7	25.1	—
		TC	207	207	212	224	243	260	—	213	213	219	227	246	263	—
	117	SHC	207	207	188	167	134	106	—	213	213	191	176	140	109	—
		kW	24.0	24.0	24.1	24.5	25.0	25.5	—	24.2	24.2	24.2	24.6	25.1	25.6	—
		TC	204	205	209	221	240	—	—	210	210	215	224	243	—	—
	120	SHC	204	205	185	166	133	—	—	210	210	193	175	139	—	—
		kW	24.7	24.7	24.8	25.2	25.7	—	—	24.9	24.9	25.0	25.3	25.8	—	—

		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 evaporator 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
0.05	1.04	2.07	3.11	4.14	5.18
0.10	0.98	1.96	2.94	3.92	4.91
0.20	0.87	1.74	2.62	3.49	4.36
0.30	0.76	1.53	2.29	3.05	3.82	Use formula
0.40	0.65	1.31	1.96	2.62	3.27	shown below.
0.50	0.55	1.09	1.64	2.18	2.73
0.60	0.44	0.87	1.31	1.74	2.18
0.70	0.33	0.65	0.98	1.31	1.64

Interpolation is permissible.

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

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