We log the heat loss of the unit over three days with an addition day for the cylinder to reach full temperature. The probes measure the temperature inside and outside the unit as well as the ambient temperature.
The data can be mapped on a graph to show the changes in temperature as the cylinder is heated by the immersion heater. The dips and peaks in the graph help display the times of the heat up cycles.
The meter readings are logged at the start and end of each test, these display the amount of energy used by the immersion heaters. This value is compared with the average temperatures of the unit and room to give a heat loss figure per 24 hours.
Due to the massive number of units we require testing, we determined it to be more economically viable to construct our own testing lab on-site. This lab is a controlled room heated to a constant 20°C to ensure minimal discrepancies in the ambient room temperature of the tests. Units as tall as 2.3m and as wide as 1050mm can be tested in the room through a removable wall section.
The tank is filled though the cold feed until water is discharged from the top pipework into a bucket (or floor) to indicate the unit is full. The immersion heater and logging software is then activated to log the initial heat up time of 24 hours. The log is kept running for an additional 72 hours to ensure an accurate result can be gathered.
After gathering heat loss data on a wide range of units, we can start to develop an accurate estimate on the heat loss reduction of our units depending on the thickness of insulation.
We have calculated that on average, each additional 25mm of insulation there is a 25-35% reduction in heat loss.
|Capacity||Insulation Thickness||Heat Loss||Watts||ERP Banding|
Northern Road Industrial Estate
Tel: 01636 678 437
Fax: 01636 678 964
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