  Observations with the SZ effect constitute a powerful new tool for
investigating clusters and constraining cosmological parameters. Of particular
interest is to investigate how the SZ signal correlates with other cluster
properties, such as the mass, temperature and X-ray luminosities. In this
presentation we quantify these relations for clusters found in hydrodynamical
simulations of large scale structure and investigate their dependence on the
effects of radiative cooling and pre-heating.
