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  2. Pulse tube refrigerator - Wikipedia

    en.wikipedia.org/wiki/Pulse_tube_refrigerator

    Therefore, the compressor is uncoupled from the cooler. A system of valves (usually a rotating valve) alternately connects the high-pressure and the low-pressure side of the compressor to the hot end of the regenerator. As the high-temperature part of this type of PTR is the same as of GM-coolers, this type of PTR is called a GM-type PTR.

  3. Lifetime Products - Wikipedia

    en.wikipedia.org/wiki/Lifetime_Products

    Lifetime Products Inc. is a privately owned company founded in Its main products are blow-molded polyethylene folding chairs and tables , picnic tables , home basketball equipment, [ 2 ] sheds , coolers , kayaks and paddleboards , and lawn and garden items, along with OEM steel and plastic items from other companies.

  4. 50 Companies with Lifetime Warranties: If It Breaks, They’ll ...

    www.aol.com/39-companies-offer-lifetime-warranty...

    16. XIKAR. XIKAR, which makes cigar accessories, offers a limited lifetime warranty on all products. Simply drop your lighter or cigar cutter in the mail, and the company will repair or replace it ...

  5. Customer review - Wikipedia

    en.wikipedia.org/wiki/Customer_review

    Abuses akin to ballot stuffing of favourable reviews by the seller (known as incentivized reviews), or negative reviews by competitors, need to be policed by the review host site. Indeed, gathering fake reviews has become big business. [2] In 2012, for example, fake book reviews have been revealed as significantly affecting ratings on Amazon.

  6. Seasonal energy efficiency ratio - Wikipedia

    en.wikipedia.org/wiki/Seasonal_energy_efficiency...

    In the United States, the efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute, a trade association, in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [1]

  7. Thermoelectric cooling - Wikipedia

    en.wikipedia.org/wiki/Thermoelectric_cooling

    Thermoelectric cooling uses the Peltier effect to create a heat flux at the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, depending on the direction of the current.

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