Isentropic Compressor Efficiency
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Pond Logic KA-60 Air Compressor $215.99 The Pond Logic KA60 is a high efficiency compressor with dual air control valves, and uses only 50W with a max air flow of 2.5cfm. It's ideal for ponds from 16,000-24,000 gallons with a maximum depth of 10'. Made in the USA. |
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Pond Logic KA-100 Air Compressor $239.99 The Pond Logic KA100 is a high efficiency compressor with dual air control valves, and uses only 100W with max air flow of 4.9cfm. It's ideal for ponds from 24,000-32,000 gallons with a maximum depth 12'. Made in the USA. |
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MURM24FWBS 5.6 Cu. Ft. Undercounter Refrigerator with Three Removable Tempered-glass Shelves Frost-free Design High-efficiency Compressor and Interior Light $1077 Keep food and beverages nearby while saving money on utility bills with this ENERGY STARR qualified 56 cu ft capacity refrigerator The better-built compressor consumes less energy to maximize operational efficiency Three full-width removable shelves ... |
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Alton 3.5 HP Air Compressor $423.94 Compressed-air power tools can dramatically decrease the amount of time spent on a project. Air tools such as brad nailers, reversible drills, and impact wrenches are more powerful than traditional electric tools, deliver higher torque and higher RPM to help get the job done quickly, and are versatile and easily interchangeable. The Alton 3.5 HP 4.5-Gallon Direct Drive Air Compressor AT012095 brings that power to both home workshops and job sites in a rugged and easily transportable wheeled frame.The Alton AT012095 uses a 3.5 HP oil-lubricated induction motor, direct drive, and an oil-lubricated reciprocating pump to build a working pressure of 95-125 PSI, filling its 4.5-gallon twin tank with compressed air at ratings of 6.0 CFM at 40 PSI and 4.5 CFM at 90 PSI. The sturdy sliding handle and 10-inch pneumatic wheels allow for quick moves between projects, and operation is monitored with two large oil-filled gauges.Key features include: reinforced frame with welded shelf for strength and durability; twin ports with quick couplers; easy to store; compact and powerful; CSA certified; and includes 1-year manufacturer's warranty. The Alton 3.5 HP 4.5-Gallon Direct Drive Air Compressor AT012095 brings the convenience and efficiency of compressed air tools to any project with ease. |
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Alton 1/3 HP Air Compressor $99.99 Compressed-air power tools can dramatically decrease the amount of time spent on a project. Air tools such as brad nailers, reversible drills, and impact wrenches are more powerful than traditional electric tools, deliver higher torque and higher RPM to help get the job done quickly, and are versatile and easily interchangeable. The Alton 1/3 HP 2-Gallon Direct Drive Air Compressor AT01101 brings that power to both home workshops and job sites in a rugged and easily transportable 19-pound frame.The Alton AT01101 uses a powerful oil-free brush motor, direct drive, and a single stage pump to build a working pressure of 70-100 PSI, filling its 2-gallon hotdog tank with compressed air at ratings of .7 CFM at 40 PSI and .5 CFM at 90 PSI. The sturdy flip-up handle allows for moves between projects and easy storage, and operation is easily monitored with the two easy-to-read gauges.Key features include: light compact design; CSA certified; ships with 25-inch recoil hose and tire chuck; includes 1-year manufacturer's warranty. The Alton 1/3 HP 2-Gallon Direct Drive Air Compressor AT01101 brings the convenience and efficiency of compressed air tools to any project with ease. |
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Respironics RDD480 MiniElite Portable Compressor Nebulizer System $89.99 At Allergy Be Gone, we know that a nebulizer is sometimes a necessity in living with allergies. And we also know that having a nebulizer can mean missing out on favorite activities due to being tied down to bulky machines. That is why we proudly offer the Respironics RDD480 MiniElite Portable Compressor Nebulizer System! This system is lightweight, compact, and designed for convenience. Weighing less than two pounds, this unit can be plugged into the wall, into a car charger, or used with a rechargeable lithium ion battery. (Battery not included.) This set includes the Mini Plus high efficiency reusable nebulizer, a carrying case, a car charger, spare filters, and an instructional DVD. Quit feeling tied down to your nebulizer and start enjoying life today! Product Description: The MiniElite is the newest of Respironics' compressor nebulizer systems, complimenting the conventionally powered Inspiration 626 , Inspiration Elite and Mister Neb systems. The MiniElite compressor nebulizer system is compact, lightweight, and designed for patient convenience. It can be powered by three versatile power sources - 110V AC, 12V DC (car) and an optional rechargeable lithium ion battery. The freedom to choose when and where patients take their aerosol treatments makes the MiniElite an ideal daily traveling companion. The compressor weighs less than a pound and less than 1.4 pounds with the optional rechargeable lithium ion battery attached. View the Respironics RDD480 Sales Brochure [Download: 192Kb .pdf, 2 pages] |
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Alton 2 HP 6-Gal Air Compressor $179.56 Compressed-air power tools can dramatically decrease the amount of time spent on a project. Air tools such as brad nailers, reversible drills, and impact wrenches are more powerful than traditional electric tools, deliver higher torque and higher RPM to help get the job done quickly, and are versatile and easily interchangeable. The Alton 2 HP 6-Gallon Direct Drive Portable Air Compressor 012046 brings that power to both home workshops and job sites in a rugged and easily transportable wheeled frame.The Alton AT012046 uses a 2 HP oil-lubricated single-phase induction motor, direct drive, and a single-stage pump to build a working pressure of 95-125 PSI, filling its 6-gallon horizontal tank with compressed air at ratings of 3.7 CFM at 40 PSI and 2.6 CFM at 90 PSI. The sturdy handle, durable rubber wheels, and rugged foot rests allow for quick moves between projects.Key features include: easy to store; compact and powerful; CSA certified; and includes 1-year manufacturer's warranty. The Alton 2 HP 6-Gallon Direct Drive Portable Air Compressor AT012046 brings the convenience and efficiency of compressed air tools to any project with ease. |
How to find the ideal enthalpy (thermodynamics help)?
A compressor is used to bring saturated water vapor at 1 MPa up to 17.5 MPa at an exit temp of 650 deg C. find the isentropic compressor efficiency.
Heres what i know.
h1= 2778.1 s1=6.5864
actual : h2=3693.9 s2= 6.7403
now the the isentropic efficiency h2s=???
i tried the equation hs=u+Pv but it is not coming out right. How do i find this value for h2s?
sorry the problem is asking to find the isentropic efficiency n=ws/wact, but i need to find hes using the steam tables, not software because I cant use a computer during a test!
h2s IS NOT the "isentropic efficiency".
h2s is the ideal enthalpy at exit
Isentropic efficiency and ideal enthalpy at exit ARE NOT the same concept.
There is no direct way of getting these properties without looking them up in steam tables. Plus, there is SOFTWARE that does it for you.
Get the software Engineering Equation Solver. Execute the below code:
"!-----Begin EES-------"
"Data"
P[1] = 1000 [kPa]
P[2] = 17500 [kPa]
T[2] = 650 [C]
x[1] = 1
"Strategy"
"Look up trivially all properties of both states"
h[1] = enthalpy(Steam, P=P[1], x=x[1])
s[1] = entropy(Steam, P=P[1], x=x[1])
h[2] = enthalpy(Steam, P=P[2], T=T[2])
s[2] = entropy(Steam, P=P[2], T=T[2])
"Now, imagine that entropy were not generated in the compressor. WHAT would need to be the exit enthalpy to still have the same pressure as P[2], but have the same entropy as s[1]? Call that h2s:"
h2s = enthalpy(Steam, P=P[2], s=s[1])
"Now crunch the definition of isentropic efficiency.
Don't memorize the formula, memorize the motto:
For a compressor:
eta_c = (what we could've put in)/(what we actually had to put in)
"
eta_c = (h2s - h[1])/(h[2] - h[1])
"!-----End EES-------"
