With this information you can calculate chiller efficiency in terms of the energy efficiency ratio, or EER, and the coefficient of performance, or COP, for chillers. COP can be used to define the cooling efficiency for a cooling system - or the heating efficiency for a heat pump system. Over a full day, a fridge is likely to use between 1 to 2 kilowatt-hours (kWh). The electrical power demand of the chiller to produce this is 460kW. I need to calculate the power consumption over the whole Day / Week / Month. The standard formula to calculate kWh is for a standard fixed consumption load. A neglected or poorly maintained cooling tower can reduce chiller efficiency by 10% to 35% and a dirty coil condenser of an air cooled chiller as much as 5% to 15% Before you think "okay great - now I know how much power my fridge uses" - sorry to say, but it This means that for every 1kW of electricity you put into the machine, you will produce 5.4kW of cooling. However, it will not work because of the variable load of the chiller. ÷ 12,000; Oversize the chiller by 20% Ideal Size in Tons = Tons x 1.2; You have the ideal size for your needs; For example, what size chiller is required to cool 40GPM from 70°F to 58°F? chiller compressor by 1% to 2 % in most situations; however, there is a limit and optimum lower condenser temperature for a given partial loading of the chiller compressor. This translates into a running cost of about $150 per year per fridge. Calculate BTU/hr. The metric calculation would be: 2,500kW / 460kW = 5.4 so the COP is 5.4. P c = useful cooling or heating power output (Btu/h, W) P = power input (Btu/h, W) The COP is an instantaneous measurement in that the units are power which can be measured at one point in time. Cooling Tower Tons. For the sake of calculation of energy / power consumption of AC, we will take 3 STAR, 1.5 ton Split AC as reference. Domestic fridge power consumption is typically between 100 and 250 watts. Hi, I need to calculate the power consumption of a chiller on N4. This post outlines, EER (Energy Efficiency Ratio), ISEER (Indian Seasonal Energy Efficiency Ratio) and the method to calculate the power consumption of 1.5 ton AC in terms of kWh or Unit. ?T°F = 70°F … Cost of kWh- This may vary depending on the region and the efficiency of the machine. The chiller system is recirculating 40 gallons per minute of water that is chilled by 24 degrees F and using 24.8 kW/hr of electricity to produce the refrigeration. Cooling Capacity of Chiller (Kw): 347 Electricity Consumption of Chiller (KWH): 117.485 Operating Current of Chiller (A): 210 COP of chiller: 2.95 Cooling Capacity of Fan coil unit (KW): 6.8 I would like to seek someone help for assessing the below calculation for energy saving. The equivalent ton on the cooling tower side actually rejects about 15000 Btu/h due to the heat-equivalent of the energy needed to drive the chiller's compressor. Watts per hour- The total watts power usage by the HVAC in one hour. Take for example a chiller which is producing 2,500kW of cooling or 8,533,364BTU/h in metric units. BTU/hr. The formula for calculating energy consumption is given below: kWh calculation: (Total Hours * Watts usage in one hour)/1000 = kWh = Gallons per hr x 8.33 x ?T°F; Calculate tons of cooling capacity Tons = BTU/hr. I have the instant power from HLI point in kW. A cooling tower ton is defined as: 1 cooling tower ton = 1 TONS evap = 1 TONS cond x 1.25 = 15000 Btu/h = 3782 k Calories/h = 15826 kJ/h = 4.396 kW. By using the power consumption method to compute power usage (utilizing the power consumption of the chiller, process heat, and the type of condenser the chiller has for calculations), one can determine the heat output in the room where the chiller is located. (347 … Per hour- the total watts power usage by the HVAC in one hour that for every 1kW electricity. 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