To truly calculate the temperature drop would require the development of a heat load model that would simulate weather conditions and other dynamics. We recommend that a computer model be built and simulations run with home conditions reflecting the 20th percentile. Customer requests information regarding the calculation of horsepower required to agitate a pulp mixture in the paper-making process. Quest line contacted many companies who manufacture mixing and agitation equipment. The consensus is that the rating of horsepower for a mixing application is very experimental.
Most companies rely on testing and past experiences to rate a piece of equipment.
Marion Mixers has been working for 15 years on calculations of horsepower required for a mixer. They use this preliminary data to determine a performance factor which is then used in conjunction with the speed of the agitator, batch weight, and volume of the tank to determine a specific horsepower. These parameters were obtained from a handbook on mixer-rheology and are attached to this correspondence. These documents also provide details on a typical paper manufacturing process and show the schematics for a submersible mixing unit. Although, the documents do not contain formulas they do identify important information.