Bench time is the general term used to describe the required delay, at ambient conditions, for a frozen gel pack or a frozen PCM to attain its latent heat of energy – or its phase change temperature.
Introduction to Thermal Energy Storage
Passive processes for thermal energy storage has received a lot of attention in the past 25 years. These passive thermal energy storage materials can typically be divided into two parts, specific and latent. This paper will primarily focus on the concept of latent heat. However, a basic understanding of specific heat is needed to fully appreciate latent heat.
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First, let’s define “gel pack”.
There are three fundamental means by which heat transfer occurs: conduction, convection and radiation.
All matter has a temperature associated with it. The way heat energy is absorbed, stored and released can have a profound affect on matter and can change its state of being. This is called phase change. Phases of matter or a substance are typically described as solid, liquid, gas and plasma. It is therefore important to recognize and understand the “types” of heat and their behaviors.
The dynamic performance of an insulated packaging system can be more fully understood when one understands the physics of heat transfer and the dynamic interaction of heat such as refrigerants (which act as a capacitor, like a battery), and insulated materials (which act as a resistor).
The acronym DQ/OQ/PQ stands for Design Qualification/Operational Qualification/Performance Qualification. It is a common industry best practice, and the basis by which an organization can reliably qualify temperature-controlled distribution processes.
What is an Ambient Temperature Profile?
An Ambient Temperature Profile is a statistical calculation, generally depicted in the form of a graph, which represents a series of uncontrolled prevailing temperatures over a fixed period of time within a specific environment or series of environments, such as a supply chain.