Biosystems Eng.: pasteurization system for peanut butter

[A Furious Potato]

Homework Statement

In recent years, there have been several significant outbreaks and recalls associated with Salmonella in peanut butter. One company has designed a thermal pasteurization system to reduce pathogen risk in peanut butter, in which the peanut butter is pumped through a heating tube and heated to 85degC (from an initial temperature of 15.6degC). You have been given values for peanut butter density (1,090 kg/m3) and specific heat (1.2 kJ/kgK). If the pasteurizer can deliver 47 kW of heating power, (a) What is the theoretical operating capacity of the pasteurizer (lb/h) of peanut butter? (b) What size storage tank (ft3) is needed to store one shift (8 h) worth of peanut butter for this facility?

Homework Equations

V=m/ρ
V=v.ΔT
Q=m.C.ΔT
W=J/s

The Attempt at a Solution

Ok, I'm lost. I don't understand the first question and I don't know where to start. I would appreciate any help.

 

[Nidum]

Deleted

 

[gneill]

Why don't you start by determining how many kg of peanut butter can pasteurized in an 8-hour shift? You can always convert that to pounds afterward.

Things associated with answering that question:
- What is the available Q over an 8-hour shift?
- What is the ΔT required?

 

[rachelmarie]

Hi I'm in the same class and don't know the answer either did you figure it out?