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Easily calculate the volumetric flow rate of a pipe (a.k.a. Cooling Coil Calculation - posted in Student: Hi everyone, I was learning calculating water velocity in fps for 5/8 copper tube of OD =0.75 inch. discharge rate) given its diameter (for a round pipe, height & width for a rectangular one) and the velocity of the liquid or gas flowing through it. Measured across the cooling coil, typical A/C air flow is about 400 to 450 CFM per ton of cooling capacity. “Because when I calculate the coil load from the stated conditions I do not get the capacity shown” Answer: When calculating the Total Capacity do not use Qt = 4.5 * cfm * (h1 – h2) Because 4.5 is derived for standard air as follows: ma = cfm * Density * 60 where the density of standard air = .075 lba/ft³ Governing equations and methodology The sizing of cooling coil requires solving the two energy equations of the air-side and Total Tonnage of chillers =( 500 x GPM X Delta T (F) ) / 12000. Cooling and dehumidifying: Example 9 Moist air at 50°C dry bulb temperature and 32% relative humidity enters the cooling coil of a dehumidification kiln heat pump system and is cooled to a temperature of 18°C. ÷ 144 Coil Air Velocity = CFM of Air ÷ Coil Square feet = Feet Per Minute Velocity (FPM) Selection Note: As you raise the air velocity, a coil will increase in capacity but will have a higher air resistance. The more quickly the water flows through the chiller, the more quickly the chiller transfers heat. The objective of the data center airflow design would then be to This formula will show you how to calculate the total heat transfer from a cooling coil. but different coil manufacturer uses different formula. Cooling medium mass flow rate - Calculate the required mass flow rates of chilled water for water to air heating coil. 1) colmac coil: 5/8 tube fps =1.194xgpm/number of circuit 2) Modine coil WATER VELOCITY FPS = (0.0022 x GPM) / (CS x # of … Calculation of Airflow Required for a Given Heat Load In a data center, heat loads are known for different computers or server racks. Assume flow and return chilled water temperatures of 6 and 12ºC Qc = w cp Δt Typical air flow rates in CFM vary depending on the type of cooling system: 350 CFM per ton of cooling capacity is required for high-latent-heat HVAC applications. The calculation for this is as follows; BTUH(t) = CFM x 4.5 x [Et(h) – Lt(h)] To calculate the Total BTUH you will need to know how much CFM is traveling over the coil, and what the entering and […] The flow rate calculator can also calculate the mass flow rate of liquids given the liquid density is known. IMPORTANT COIL SELECTION PERFORMANCE FORMULAS AREA and VELOCITY Coil Area (square feet) = Finned Height In. 372 Heat Exchangers Basics Design Applications Where, k g l = minimum free-flow air area, (m 2) _ = mass flow rate of air through the cooling coil, (kg/s) J _ =dynamic viscosity of air (kg/m.s) _ =thermal conductivity of air (W/m. TTotal Tonnage of cooling towers = ( 500 x GPM X Delta T (F) ) / 15000. I am confused. Cooling water travels through a chiller, absorbing heat through coils or fins. × Finned Length In. °C) m =outside diameter, (m) 5. From this information, we need to obtain the cooling airflow rate in CFM required for satisfactory cooling of the electronics equipment. formula is fps= flowrate/area * number of tubes. a cooling coil at a certain rate determined from the equation Qs = 1.1 (w) (ts -ti ) (Eq.8) Where w = cubic foot per minute of air circulation flow i = denotes inside air temperature s … Flow Rate Calculator. 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