It is not clear with your Question what you want to use? if you are willing to get work then no if you are using a closed sealed container of constant volume and yes if the volume of the container can be changed.

Second thing is that if you have a constant volume container and you want to reduce the pressure inside by suction then some part of liquid(if any inside) will convert into the vapor at the same temperature. It may start boiling if the pressure goes below a certain value which you can in any table having pressure based boiling points.

But i am afraid that you can get some useful work by this process.

Dear Sir, please look at this paper I think it will be useful for your interest. regards

Yes it is possible, but it is not worth while in that your efficiency is limited to 100%, whereas reverse refrigeration, referred to as a heat-pump, has an efficiency of perhaps 300%. That is the short answer.

In the case you are using your study opportunity to consider using cheap external heating of water, which is then introduced into your system for heating or indeed desalination, and you need to efficiently remove spend thermal fluid from your Vac, in such case...

I can supply you the knowledge to swap incoming loaded thermal fluid for spent thermal fluid into and out of pressure variable.

Thank you for your answers..

If your container is sealed (after taking most of the air out) and at constant volume, you may use the latent heat of vaporisation/condensation to store some heat at a temperature lower than 100 °C. However the storage capacity will not be large, since it is about 2300 kJ/kg of evaporated water or condensed vapour, and the vapour density is of course very low. So the volume required to store heat this way could be very large. For example, water boils at 20 °C if the pressure is 2337 Pa. At that pressure the vapour density is about 17 g/m³ or the heat storage capacity will be less than 40 kJ/m³ or a bit more than 11 Wh/m³