Air Cooled Heat Exchanger Fan Power Calculation

Houston texas noise control of air cooled heat exchangers seebold 5 gives.

Air cooled heat exchanger fan power calculation.

Ache air cooled heat exchanger acfm actual cubic feet per minute act actual conditions asp actual static pressure atp actual total pressure avp actual velocity pressure bhp brake horsepower bpf beam or blade passing frequency cs current source cfm cubic feet per minute dr density ratio eff efficiency d fan diameter. Air cooled heat exchanger software achex is made to demonstrates the thermal design and sizing calculations of air cooled heat exchangers. Power requirements for air cooled heat exchangers can be lower than at the summer design condition provided that an adequate means of air flow control is used. Air cooled heat exchanger sizing does preliminary estimation of finned area plot size total fan power and air outlet temperature checalc chemical engineering calculations to assist process plant operation and maintenance engineers.

Operating cost of wche includes cost of make up water for the cooling water power required for the cooling tower fans and for the circulating pump cooling tower maintenance etc. From dust pollen etc 3 high electrical power consumption related to fan aerodynamic efficiency and 4 heat exchanger cooling capacity limitations i mposed by fan noise. Progress in forced air heat exchanger technology is hampered by the fundamental physical. An air cooled heat exchanger like any other heat exchanger must satisfy the following basic equation.

Cair ccold q t q t 2 t 1 air side heat capacity rate btu hr f 1 08 fv l w ctube chot q t q t 1 t 2 tube side heat capacity rate btu hr f. The software will design horizontal induced draft or forced draft units for liquid and gas services and will produce a three page summary of all results and a basic drawing representation. 1 5 1 advantages ø generally operating cost for air cooled heat exchanger ache is less than the same of water cooled heat exchanger wche. The annual power requirement for an exchanger is a function of the means of air flow control the exchanger service the air temperature rise and the approach temperature.

Air 1 tubeside air f f w t i l r r u h h r 5 2 where hair airside heat transfer coefficient 29. Air cooled heat exchanger noise is mostly generated by fan blade vortex shedding and air turbulence. Mtd q a u 5 1 where a heat transfer area u overall heat transfer coefficient mtd mean temperature difference the overall heat transfer coefficient is determined as follows. Spl sound pressure level re 0 0002 microbars db hp hp consumed power basis d fan diameter ft.

While operating cost of ache includes cost of power consumed by fan. An equation to predict the spl at a specific point with respect to the unit. 2 performance degradation due to heat exchanger fouling e g.