A ton of refrigeration (commonly abbreviated as TR) is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the heat of fusion absorbed by melting 1 short ton (2,000 lb; 0.893 long tons; 0.907 t) of pure ice at 0 °C (32 °F) in 24 hours.[2] It is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. A refrigeration ton is approximately equivalent to 12,000 BTU/h or 3.5 kW. Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of refrigeration). Many manufacturers also specify capacity in BTU/h, especially when specifying the performance of smaller equipment.What is acre (unit)Acre is an area measurement unit An acre (ac) is a measurement unit of land area. The exact value of one acre depends on a definition of a foot.

All calculations and conversions here (this website) are peformed for an international acre1 acre = 4.0468564224 × 10+27 picometers²1 ac = 4.0468564224 × 10+27 pm²1 acre = 4.0468564224 × 10+23 angstroms²1 ac = 4.0468564224 × 10+23 Ų1 acre = 4.0468564224 × 10+21 nanometers²1 ac = 4.0468564224 × 10+21 nm²1 acre = 4.0468564224 × 10+15 microns²1 ac = 4.0468564224 × 10+15 µm²1 acre = 4.0468564224 × 10+15 micrometers²1 ac = 4.0468564224 × 10+15 µm²1 acre = 4 046 856 422.4 millimeters²1 ac = 4 046 856 422.4 mm²1 acre = 40 468 564.224 centimeters²1 diy ac unit installationac = 40 468 564.224 cm²1 acre = 404 685.64224 decimeters²1 ac = 404 685.64224 dm²1 acre = 4 046.8564224 meters²1 ac = 4 046.8564224 m²1 acre = 40.4685642 dekameters²1 ac = 40.4685642 dam²1 acre = 0.004046856 kilometer²1 ac = 0.004046856 km²1 acre = 40.468564224 are1 ac = 40.468564224 a1 acre = 0.40468564224 hectare1 ac = 0.40468564224 ha1 acre = 0.4046856422 hectometer²1 ac = 0.4046856422 hm²1 acre = 0.001179874545 nautical mile²1 ac = 0.001179874545 M²1 acre = 6.27264 × 10+18 microinches²1 ac = 6.27264 × 10+18 µin²1 acre = 6 272 640 000 000 mils²1 ac = 6 272 640 000 how much for new hvac unit

000 mil²1 acre = 6 272 640 000 000 thou²1 ac = 6 272 640 000 000 thou²1 acre = 6 272 640 inch²1 ac = 6 272 640 in²1 acre = 43 560 feet²1 ac = 43 560 ft²1 acre = 0.0015625 mile²1 ac = 0.0015625 mi²1 acre = 4 840 yards²1 ac = 4 840 yd²1 acre = 1 210 fathoms²1 ac = 1 210 ftm²1 acre = 10 chains²1 ac = 10 chain²1 acre = 0.1 furlong²1 ac = 0.1 furlong²1 acre = 1.80828538558 × 10-19 astronomical unit²1 ac = 1.80828538558 × 10-19 au²1 acre = 4.52154657598 × 10-29 used ac window units salelight year²1 ac = 4.52154657598 × 10-29 ly²1 acre = 4.25026449754 × 10-30 parsec²1 ac = 4.25026449754 × 10-30 pc² Foods, Nutrients and CaloriesBread, oatmeal contain(s) 269 calories per 100 grams or ≈3.527 ounces  [ calories | price ]Gravels and SubstratesCaribSea, Freshwater, Super Naturals, Snowy River density is equal to 1457.68 kg/m³ or 91 lb/ft³ with specific gravity of 1.45768 relative to pure water. 

Calculate how much of this gravel is required to attain a specific depth in a cylinder,  quarter cylinder  or in a rectangular shaped aquarium or pondMaterials and SubstancesMuriatic acid weigh(s) 1.639 gram per (cubic centimeter) or 0.947 ounce per (cubic inch)  [ weight to volume | volume to weight | density ]What is pound per foot-hour?A pound per foot-hour (lb/ft/h) is a non-SI (non-System International) measurement unit of dynamic viscosity.read more...»What is radiation absorbed dose measurement?Radiation exposure to effects of alpha (α), beta (β) and heavy particles, neutrons of unknown energy and high-energy protons, fission fragments, gamma (γ) and X- rays is a matter of public health.read more...»Learning Center » A/C & Heating » Air Conditioning BTU’s: What Are They & What Do They Mean?Air Conditioning BTU’s: What Are They & What Do They Mean? BTU, which stands for British Thermal Unit, is a measure of heat energy. One BTU corresponds to the amount of thermal (heat) energy required to heat one pound of water one degree Fahrenheit.

For technical purposes, a BTU also equals: 252 heat calories (not the same kilo-calories measured in food) one third of a watt-hour BTUs work in reverse, too. That is, a BTU measures the amount of energy required to lower the temperature of one pound of water one degree Fahrenheit. BTU in Practical Use HVAC professionals use BTUs to measure the cooling capacity of an air conditioning unit. The higher the BTU measurement, the more powerful the air conditioner, and, usually, the higher the price, as well. Air conditioners typically start at approximately 1,000 BTU. When used to describe a unit of power, as is the case with air conditioning systems, BTU is written as BTU per hour, or BTU/h. For instance, a 10,000 BTU/h air conditioner provides 10,000 BTUs per hour to cool a home. How many BTUs are enough for your home cooling system? To determine how many BTUs you need for your new air conditioning system, first calculate the size of the space you need to cool.

For room air conditioner units – either portable, window, or wall units – multiply the width of the room by the length to figure out the total square footage. To determine your whole house square footage, measure along two outside walls of your home. For an L-shaped ranch or other irregularly-shaped house where rooms protrude, take one measurement for the basic square or rectangle of the home, and a separate measurement for any rooms not included in that calculation and add the two together. With your square footage measurement in hand, multiply that number by 35 to get an estimate of the BTUs necessary to cool your home or room. A few other guidelines will help you purchase the right size unit: If the room is shaded, reduce the BTUs needed by 10 percent In a sunny room, see if you can shade the area or add 10 percent more BTUs Add 4,000 BTUs for an AC in the kitchen since kitchen appliances generate a lot of heat If more than two people spend a lot of time in a room (for instance, a family room or dining room), add 600 BTUs per person to cool that room