The capillary tube — the simplest of refrigerant controls — is the most popular method for metering refrigerant flow from the condenser to the evaporator in compression-type refrigeration systems.

The capillary tube has been used as a refrigerant metering device for many decades. Many HVACR manufacturers are still successfully employing capillary tube metering devices in their latest equipment.

Researchers are still busy trying to understand some of the CNT basics, for instance something as fundamental as "how do nanotubes grow"? How can their various properties – electronic, transport, or ...