In an isenthalpic process there is no transfer of heat to (or from) the surroundings, and no work done on (or by) the surroundings. ... There is no work done on the surroundings; nor is there heat transfer. Thus, enthalpy is preserved.

Which process is an isenthalpic process?

Isoenthalpic means constant enthalpy, and any material which passes through a system without a change of enthalpy has, by definition, passed through an isoenthalpic process.

How Joule Thomson effect is an isenthalpic process?

The Joule-Thomson effect is an isenthalpic process, meaning that the enthalpy of the fluid is constant (i.e., does not change) during the process. ... Engineers often refer to it as simply the J-T effect. There is no temperature change when an ideal gas is allowed to expand through an insulated throttling device.