We make predictions for the diffuse far-infrared ( FIR ) emission from dust in the intracluster medium ( ICM ) of the Virgo cluster using detailed information on potential dust sources , grain heating and sputtering rates available for this cluster from recent optical and X-ray studies .
In the cluster core we identify the winds of red giant and supergiant IC stars as the main continuous sources of IC grains , with a dust injection rate of 0.17 M _ { \odot } yr ^ { -1 } .
The predicted FIR surface brightness from this dust component is however a factor of \sim 10 below the detection limit of currently available telescopes .
Grains that are impulsively removed from spiral galaxies by ram-pressure stripping as they enter the cluster core region can sporadically dominate the grain injection rate into the ICM .
However , these events should lead to the appearence of rare , relatively bright , localised FIR sources around the parent galaxy .

The outer regions of dynamically young clusters like the Virgo cluster have a further potential source of intracluster grains since they are still accreting freshly infalling spiral galaxies which are presumably contained in an accreting intergalactic medium ( IGM ) .
We show that cosmics ray driven winds from the infalling spirals can inject grains into a subvirial IGM that is external to the observed X-ray-emitting ICM .
Sputtering during the injection process and in the IGM is weak , so that the injected grains should accumulate in the IGM until the infall brings them into contact with the hot ICM .
Normalising the mass loss rate in the galactic winds to the mass-loss rate and B-band luminosity of the Milky Way , we estimate a dust accretion rate of 1.0 M _ { \odot } yr ^ { -1 } from the infalling IGM .
This effect dominates the dust injection rate from known sources embedded in the hot Virgo ICM .
Thus , any detection of diffuse IR emission would probe the current dust accretion rate for the cluster , acting as an indicator of the youth and the dynamical state of the cluster .
The predictions for the Virgo cluster are generalised to other clusters and the possibility of detection of dynamically young clusters at cosmological distances is discussed .
Although dominated by the discrete source emission from galactic disks , it is possible that diffuse sub-mm dust emission from the ICM could be detected in experiments similar to those designed to map the sub-mm excess due to the Sunyaev-Zeldovich effect in distant clusters .