COIL PERFORMANCE
Ø
IDEALLY, WATER SIDE CAPACITY SHOULD BE EQUAL
TO AIR SIDE CAPACITY
Q = U
X A X LOG MEAN TEMPERATURE DIFFERENCE.
U = DEPENDS ON
GEOMETRY, FIN SPACING/TYPE, WATER CIRCUIT/VELOCITY, AIR VELOCITY OVER COIL,
U INCREASES
WITH INCREASE IN WATER VELOCITY & AIR FACE VELOCITY.
Ø
TOTAL SURFACE AREA DEPENDS
ON FINNED LENGTH, FINNED WIDTH, ROWS DEEP, NO. OF FINS/INCH
Ø FACE AREA: DEPENDS ON FINNED LENGTH
AND FINNED HEIGHT.
Ø FACE VELOCITY: AIR
QUANTITY / FACE AREA
Ø WATER CIRCUITS: 2 TUBES PER CIRCUIT, 4 TUBE PER CIRCUIT, 6 TUBES PER
CIRCUIT, 8 TUBES PER CIRCUIT ETC.
Ø
INCREASE IN CAPACITY WITH
INCREASE IN WATER PRESSURE DROP.
Ø
HIGHER THE FINS/INCH,
HIGHER THE TURBULENCE, HIGHER THE AIR PRESSURE DROP & LOWER IS THE BY PASS FACTOR.
Ø
COOLING CAPACITY =
SENSIBLE + LATENT
Ø
SENSIBLE CAPACITY CAN BE
ENHANCED BY INCREASING FACE
AREA.(GENERALY 4 ROWS DEEP)
Ø LATENT CAPACITY CAN BE
ENHANCED BY INCREASING
ROW DEEP (GENERALLY 6,8 ROWS)
Ø LOWERINGCOOLANT
TEMPERATURE WILL INCREASE BOTH SENSIBLE AND LATENT CAPACITY.
Ø HOT WATER COIL NORMALLY
HAS MAXIMUM 2 ROWS DEEP COIL.
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