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HVAC FORMULAHeating Ventilating and air conditioning formulas and equations.
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Heating Ventilating and air conditioning formulas and equations.
http://hvacformula.blogspot.com/
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HVAC FORMULA | hvacformula.blogspot.com Reviews
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Heating Ventilating and air conditioning formulas and equations.
hvacformula.blogspot.com
HVAC FORMULA: CHILLER HEAT LOAD & WATER FLOW
http://hvacformula.blogspot.com/2008/12/chiller-heat-load-water-flow.html
Heating Ventilating and air conditioning formulas and equations. CHILLER HEAT LOAD and WATER FLOW. The flow rate necessary to deliver the full output of the heat source at a specific temperature drop can be found using equation below:. Q = H / (8.01 x ρ x c x ▲T). 8226; Q= Water volume flow rate (GPM). 8226; H = Heat load (Btu/hr). 8226; ▲T = Intended temperature drop (°F). 8226; ρ = Fluid's density at the average system temperature (lb/ft3). 8226; 8.01 = a constant. H = 500 x Q x ▲T. Qe = Htons x 24 / T.
HVAC FORMULA: FAN EQUATIONS
http://hvacformula.blogspot.com/2008/12/fan-equations.html
Heating Ventilating and air conditioning formulas and equations. BHP = Q x SP / (6356 x Fan Ef f.). 8226; BHP = Break Horsepower. 8226; Pt = Total pressure, in-WG. 8226; Q = Air flow rate in CFM. 8226; SP = Static pressure in-WG. 8226; FAN EFF = Fan efficiency usually in 65–85% range. Motor HP = BHP / MotorEFF. 8226; BHP = Break Horsepower. 8226; MotorEFF = Motor drive efficienc y usually 80-95%. Ts = 3.14 x D x N. 8226; Ts = Fan tip speed, FPM. 8226; D = Fan diameter, ft. 8226; N = Fan speed, RPM.
HVAC FORMULA: SUPPLY AIR FLOW RATE
http://hvacformula.blogspot.com/2008/12/supply-air-flow-rate.html
Heating Ventilating and air conditioning formulas and equations. SUPPLY AIR FLOW RATE. Supply air flow rate to a space is based only on the total space sensible heat load, thus. Q = 108 x [Hs / (TR – TS)]. 8226; Q = air flow in cubic feet per minute (CFM). 8226; HS = total room sensible heat gain, BTU per hr. 8226; TR = Room dry bulb temperature, °F usually 75ºF. 8226; TS = Supply air or leaving air temperature from the cooling coil in ºF. Supply airflow rate (CFM) can be calculated.
HVAC FORMULA: FRICTION LOSS IN WATER PIPES
http://hvacformula.blogspot.com/2008/12/friction-loss-in-water-pipes.html
Heating Ventilating and air conditioning formulas and equations. FRICTION LOSS IN WATER PIPES. Friction loss in water pipes can be obtained by using the empirical Hazen-Williams equation. F = 02083 (100/C)1.852 Q1.852/ d4.8655. 8226; f = friction head loss in feet of water per 100 feet of pipe. 8226; C = Hazen-Williams roughness constant. 8226; Q = volume flow (gal/min). 8226; d = inside diameter (inches). Darcy-Weisbach equation and Head Loss. H loss = λ (L / dn) [v2/ (2 x g)]. The Reynolds Number (Re) ...
HVAC FORMULA: SENSIBLE HEAT FACTOR or RATIO (SHR)
http://hvacformula.blogspot.com/2008/12/sensible-heat-factor-or-ratio-shr.html
Heating Ventilating and air conditioning formulas and equations. SENSIBLE HEAT FACTOR or RATIO (SHR). SHR = Hs / Ht = Hs / (Hs HL ). 8226; SHR = Sensible heat ratio. 8226; HS = Sensible heat gain. 8226; HL = Latent heat gain. 8226; Ht = Total heat gain. 1 SHR from 0.95 - 1.00 for Precision air conditioning (computers and data centres). 2 SHR from 0.65 - 0.75 for Comfort cooling (people). 3 SHR from 0.50 - 0.60 for Dehumidification (pools and outside air). There was an error in this gadget.
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HVAC FORMULA
Heating Ventilating and air conditioning formulas and equations. COOLING and HEATING EQUATIONS. SENSIBLE HEAT FACTOR or RATIO (SHR). SUPPLY AIR FLOW RATE. CALCULATION OF HEATING, COOLING DEGREE DAYS. FUEL CONSUMPTION BY HEATING, COOLING UNITS. AIR CHANGE RATE EQUATIONS. ESTIMATING AIR VOLUME FOR HOODS AND ITS PRESSURE. CHILLER HEAT LOAD and WATER FLOW. FRICTION LOSS IN WATER PIPES. TONS OF REFRIGERATION (TR). ENERGY EFFICIENCY TERMS OF REFRIGERATION SYSTEMS. STEAM and CONDENSATE EQUATIONS.
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