The project I am working on requires heating and cooling. A jacketed vessel can be used, but there is no steam available. The vessel is required to be heated to 60-65 degrees C and then the temperature is lowered to 35-40 degrees C. Pressure is 0 psig. What alternative heating and cooling methods are there? And how would I calculate heat load?
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Jim Grant Forum Moderator 117 Posts
Re: Alternative Heating and Cooling Methods17 February 2009 at 1:29pmIn this type of system it is often advantageous to use a closed-loop heating/cooling system. The temperature ranges you suggest indicate that a water or water/glycol system could work very effectively. The system requires a circulating loop and temperature controls as well as two heat exchangers for heating/cooling the closed loop system. Since steam is not available, there are electrical resistance heaters that could be used and either chilled water or a refrigeration system could be used to provide the cooling. Heat load is calculated based on the desired heating/cooling times, which are transient calculations that will have a peak at the beginning of each cycle. The system would need to be designed for that peak duty.