A room air conditioner's efficiency is measured by the energy efficiency ratio (EER). The EER isthe ratio of the cooling capacity (in British thermal units [Btu] per hour) to the power input (in watts). The higher the EER rating, the more efficient the air conditioner. What is EER an...
A data center's cooling needs can change over time, so you should consider oversizing your cooling system for future growth. Oversizing also has the benefits of being used for redundancy if part of the cooling system fails at some point or if you must take part of it down for maintenance...
Explain how to convert 6.60 x 1010 joules to British thermal units (Btu). Calculate the quantity of heat required to raise the temperature of 40.0 g of water from 22.1 degrees C to 35.3 degrees C. Calculate the specific heat of a metallic element if 314 joules of energy are needed to ra...
How To Calculate CFM For A Room? (Solved Example) Let’s say we have a big 1,000 sq ft room with standard 8 ft high ceiling. We want to calculate the CFM of a fan that will exchange all the air in such a room every 15 minutes (ACH = 4). ...
At room temperature, the density of PS is 1.04 g/cm3 and PP has a room-temperature density 0.90 g/cm3. You cannot compare your PP number to the machine specification because of the difference in densities between materials. So, for your 164 g shot size you need to correlate the PP ...
An air conditioner's BTU (for British Thermal Unit) rating is a measure of its cooling power. An 8,000 BTU window unit, for instance, can typically cool a room of 300 to 350 square feet, according to the California Energy Commission. However, window AC units with the same BTU rating ...
Watts:Total ITE load plus in-room UPS heat load. For UPS, WattsEQUIV= BTU / 3.412. τMassmin:Thermal mass heating time estimate (0.5 to 1.5 minutes). High power densities reduce time. Simplified method of calculation Only four factors account for 95% of the rate of thermal rise. If ...
Calculate heat transfer rate, Q. Q is measured in units of energy per unit time, such as BTU/hr or Watts. For a wall of uniform thickness d, with a thermal conductivity of k, an area of A, a hot temperature, Thot, and cold temperature, Tcold, solve Q with the following equation:...
The BTU (British Thermal Unit) is a standard measure used for rating the energy output of appliances (such as heating and cooling systems) and for measuring energy consumption. One BTU is equal to the energy needed to increase the temperature of one pound of water by one degree Fahrenheit. ...
the quantity known as energy in physics. Energy has units of force times distance, or newton-meters, but this is usually called the joule (J). In some applications, the calorie, equal to 4.18 J, is the standard unit; in still others, the btu, or British themal unit, rules the day....