Evitherm and the COLD Food Industry Chris Kennedy

Evitherm and the COLD Food Industry Chris Kennedy Nutri. Freeze Ltd. 2/22/2021 Nutri. Freeze Limited 1

Nutri. Freeze (Who are we? ) n Consultants n n n Equipment development Chillers and Freezers Thermal Modelling HACCP Manufacturers and Suppliers n n 2/22/2021 Foodsa. Fe Thermometers HACCP-Now Software Nutri. Freeze Limited 2

Topics of Discussion n Calorimetry n n n Thermal Modelling n n For design For pricing Capacity and residence time How Evitherm can help n 2/22/2021 “If only knew the value for…. Nutri. Freeze Limited 3

Calorimetry and the refrigerated food Industry n Design, Installation or operation of freezers and chillers n Question: Capacity and Residence time n n n E. g. what is the refrigeration capacity required to cool 10, 000 chickens per hour from 40 o. C to 4 o. C? Answers Salesman: “I’ve worked in industry 98 years and you need x k. W” Web/textbook: “You have y% protein z% fat … therefore you need xx k. W (Where xx<<x)” Nutri. Freeze: “Lend me a chicken and we’ll measure it!” 2/22/2021 Nutri. Freeze Limited 4

Pricing n Question: I send my product out to be frozen, what should I pay? n n 2/22/2021 Enthalpy (H) Coefficient of performance (Co. P) Electrical cost (£) Cost = mass x H X £/ Co. P Nutri. Freeze Limited 5

Thermal Modelling n There’s a lot of it about n HEATSOLV n Temprof 2000 n Coolvan n All finite difference techniques employing: n n n Q=h(Ts-Ta) Qn= k. A/L DH= Hn+Qn-Qn+1 n More expensive finite element packages Garbage in = Garbage out n Conductivity, enthalpy and melting temperature n 2/22/2021 Nutri. Freeze Limited 6

Input data (Edited Cos. Therm) 2/22/2021 Nutri. Freeze Limited 7

TEMPROF 2000 2/22/2021 Nutri. Freeze Limited 8

T profile across the product 2/22/2021 Nutri. Freeze Limited 9

Surface, core and equilibrated temperatures 2/22/2021 Nutri. Freeze Limited 10

How can Evi. Therm help ? n TIME, Time and Time again n n Key data for refrigerating foods are: n n Evitherm will be visited if it saves time Enthalpy-temperature Melting point Conductivity-Temperature Presented as n n n 2/22/2021 Download tables Plots formulae Nutri. Freeze Limited 11

Difficulties n Variability n n n Accuracy of data n n Thermal properties for meats can be affected by differences in breed, growth conditions, and even transport conditions. Formulation of manufactured products can show wide variation between producers if not batches Reliability and limits of variation Other materials also need to be considered n n 2/22/2021 Packaging materials, cardboard plastic and wood Refrigeration of plant includes load from walls converyor etc. Nutri. Freeze Limited 12

Currently n Currently we use a wide range of sources n n n COSTHERM University physics (SZY) Google Numerous texts Library and published data is often too unreliable and too inconvenient Nobody pays for an unsuccessful search. 2/22/2021 Nutri. Freeze Limited 13

A one stop shop or just another stall n n n Collection of published data Portal facility: - links to all other data sources Search and assessment of other sites 2/22/2021 Nutri. Freeze Limited 14

Will Evitherm be used. . ? n Some useful data n n Comprehensive easy to use data n n A port of call First port of call Links to and assessment of all major data sources n 2/22/2021 Only port of call. Nutri. Freeze Limited 15