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World's smallest BLDC compressors, 1.4cc/1.9cc per revolution, 360W/455W ASHRAE LBP Capacity, 590g or 680g, 95mm tall, High COP - details see: https://www.machineto.com/small-bldc-rotary-refrigeration-compressors-10247249

Extremely small, high-performance, highly reliable, and highest quality rotary, miniature, BLDC refrigeration compressors with the size of a child’s fist and weighting only 590~680g are produced in Somerset, KY, USA and available around the world. Current models produce as much as 360 ~ 455W of cooling under standard ASHRAE conditions using a single cylinder configuration. Compatible with various refrigerants and running on 12, 24 48VDC, etc. or AC power through a AC-DC conversion, the new compressors are starting a new trend in various compact mobile cooling systems as well as small foot-print countertop appliances with cooling or ice making capabilities. Specifications for Aspen Compressor's Miniature Refrigeration Compressors are given below.

Refrigerant	R134a, 404A, etc.
Lubricating Oil	Polyol ester oil
Compressor Type	Single Cylinder Rotary (Rolling Piston)
Displacement	1.4cc or 1.9cc per revolution
ASHRAE Cooling Capacity	360 or 455W, respectively
Speed	Variable (2100 – 6500 RPM)
Motor	Brushless, Sensor-less DC, Rare-earth PM
Nominal Input Voltage	12, 24, or 48V DC
Maximum Current	9.5, 9.5 and 7 A, respectively
Allowable In-rush Current (50 milliseconds)	25, 25 and 15A, respectively
Evaporator Temperature Range	-18 to +24ºC
Condenser Temperature Range	27 to 71ºC
Maximum Compression Ratio	8:1
UL versions, currently available	1.4 or 1.9cc, 24V

An independent evaluation of the 1.4cc 24V compressor was performed at Purdue University, which included measurement of cooling capacity, Coefficient of Performance (COP), and volumetric and overall isentropic efficiencies¹. Volumetric efficiencies were found to range from 73% to 90%, while the overall isentropic efficiency varied from 44% to 70%. Cooling capacity was measured from 163 W to 489 W, while the COP varied from 2.1 to 7.4. Comparison between the New Miniature Compressor and the most widely used BLDC Reciprocating Compressor with 30% less Cooling Capacity is given below.

Type	Smallest Competing Reciprocating BLDC Compressor	Aspen’s Rotary BLDC Compressor (14-12-1101)
Refrigerant	R-134a	R-134a
Volume, cu.in.	130	11
Displacement per revolution, cc	2.0	1.4
Weight, lbs.	9.5	1.3
Speed, RPM	2,000-3,500	2,100 – 6,500
Capacity (ASHRAE), W (Btu/h)	252 (860)	360 (1230)
Volumetric Cooling Capacity Density, Btu/cu.in {ratio}	6.6 {1}	112 {17}
Weight Cooling Capacity Density, Btu/cu.in {ratio}	90.5{1}	946 {10.5}

The new rotary compressor has 17 times the cooling power for the same volume, and 10.5 times the cooling power for the same weight!

A large space and weight savings can be achieved using Aspen Compressor's miniature compressors. Such factors have historically been prized in mobile refrigeration systems only. Now, even though highly unusual for a DC powered compressor, due to the extraordinary advantages in terms of weight and volume savings, the miniature compressors are being considered in various stationary applications, such as household countertop appliance: beverage dispensers; ice makers; ice cream machines, coffee machines, etc. when the small compressor size is highly desired to make the footprint of the appliance small.

When the miniature compressor is used in a refrigeration system together with a high performance condenser and evaporator, the complete refrigeration system can be incorporated within a package. This allows a major space reallocation in the cabinet; namely, much less volume for the refrigeration system and considerably more volume for product storage space. There’s also a weight reduction of approximately 10 lbs (4.54 kg) just from the use of mini-compressors. But for the most part, the space savings are usually considered more important than weight savings in most refrigerated appliances. Numerous refrigerated appliances can benefit from the size and weight reduction of a compressor. Some of the relevant refrigerated appliances are listed below:

Countertop Appliances/Refrigerated, Cooled Display Cases

Commercial Refrigerators/Freezers, Refrigerated Buffet Units

Household Appliance, Overclocking of Personal computers

Beverage Dispensers/Refrigerated, Milk Coolers/Dispensers

Cabinets/Refrigerated, Mini-Bars

Beverage Carts, Reach-In Freezers

Drawers/Refrigerated, Yogurt/Smoothie/Slush Machines

Ice Cream Cabinets/Dispensers, Wine Coolers

Ice Storage Bins/Chests, Beer Dispensers

Medical Product Storage, Vaccine/Medical Transport

Portable Spot Coolers, Mini Air Conditioners

Solar-Powered A/C & Refrigerator, Marine Refrigerators

Truck Sleeping Compartment A/C and Refrigerator/Freezer

Recreational Vehicle A/C and Refrigerator/Freezer

Aspen's extremely compact, miniature BLDC refrigeration compressors are already being introduced in many new applications that did not even exist, or were not feasible before and, as time goes by, their usage will inexorably become ubiquitous ushering in an era of super-efficient micro scale Distributed Cooling.

A Cautionary Note to first time users of Aspen's miniature compressors

In the excitement and rush of trying to incorporate our miniature compressors into refrigeration system, new or old, even experienced refrigeration engineers/technicians tend to overlook or ignore the fact that our compressors come with only 21cc of POE oil inside. In the case of the conventional DC compressors, the oil contained in the compressor is ~ 150 to 200cc and even if 10% of the oil is lost to the balance of the system, there would be sufficient amount of oil left for lubricating the compressor. It is quite important to know however that, depending on the overall size of the refrigeration system using Aspen's miniature compressors, a significant or major portion of the oil from the miniature compressors may go out with the discharged refrigerant and may never return to the compressor with the returning refrigerant. One must not forget to replenish the oil that would be lost to the balance of the cooling system! Otherwise, the miniature compressor would malfunction rapidly due to lack of lubrication oil.

For more technical information and assistance, please visit Aspen Compressor directly at www.aspencompressor.com.

Aspen Compressor's Product List

Model No.*	Displacement per Revolution, cc	Voltage Range, VDC	Maximum Continuous Current**, A	Weight, g	Compressor Height, mm	Certifcations
14-12-1101	1.4	11-16	12	590	66.8
14-24-1101	1.4	20-30	9.5	590	66.8
14-24-1111	1.4	20-30	9.5	590	66.8	UL
19-24-1101	1.9	20-30	9.5	680	68.8
19-24-1111	1.9	20-30	9.5	680	68.8	UL
19-48-1101	1.9	43-60	7.0	680	68.8

* Each Compressor comes with attached Mounting Brackets, attached Suction Accumulator and BLDC Motor Drive Electronics Board.