Energy Saving for Temperature Control Applications
Through many years of research and development, we have completed a fully comprehensive range of energy saving features to benefit our temperature control customers, including:
- Pack optimisation
The pack optimisation feature enables the target pressure of a pack controller to be adjusted in response to the average valve openings of all the evaporators using that pack. This ensures that all the evaporators are being used at optimum efficiency and the resultant energy usage of the pack compressors is reduced.
Optimisation requires an Resource Data Management (RDM) pack controller to be used in conjunction with RDM's Data Manager DMTouch, and a number of networked evaporator controllers.
- Network trim
The network trim feature can be used in conjunction with networked RDM case controllers with trim heater (anti-condensate) control. Using a humidity and ambient temperature sensor reading from anywhere on the network, the DMTouch will instruct the controllers to adjust their trim heater output levels accordingly. The output level of the trim heaters will be enough to prevent condensation forming without using unnecessary power and will constantly adjust to changing atmospheric conditions.
The trim heat level settings can also be automatically reduced at night time to provide further energy savings when the facility is unoccupied. Even by simply reducing the maximum output of the heaters to 70% (as opposed to always on), energy consumption is instantly reduced by 30%.
- Night blinds check
When fitted to a refrigerated cabinet, night blinds (deployed after store trading) can reduce the power requirement of the case by up to 40%. This, of course, is dependent on the night blinds actually being used. By comparing different temperature sensors in the refrigerated cabinet, a DMTouch can ascertain if the night blinds have been used and generate an alarm if they have not. A DMTouch can also produce a report detailing night blind use for the store.
- Condenser temperature differential
The condenser TD feature provides monitoring of the efficiency of up to 50 condenser units. Three probes are fitted to the condenser to measure liquid return, discharge and ambient air temperature. A DMTouch will report three levels of alarm: pre-warning, warning and alarm, thus giving early notification if a condenser is not operating efficiently (due to the condenser being blocked with leaves or rubbish for example). Two measurement methods are available: Discharge to Liquid Return and Liquid Return to Ambient Air On.
- Temperature performance indicator
This performance feature monitors the performance of the case allocating a score for easy monitoring. TPI informs the user of poor performing equipment providing a predictive monitoring solution to easily identify faults before they become a costly issue. The score is based on a number of variables such as the set-point, differential, over-temperature alarms and under-temperature alarms. A score of one equates to a good performance, a score of 10 equates to poor performance.
The performance indicator is also displayed in the Device List as shown. If the energy feature Pack Optimisation has been enabled there will be an additional column “Pack”, as shown. This also has a similar performance indicator for each case and gives an indication as to which case is holding optimisation off. Red indicates a case holding optimisation off. Green is ok.
- Defrost warning
The Defrost Warning feature for DMTouch produces an alarm on the device when a consecutive number of defrost cycles on a particular evaporator terminate based on the maximum time setting rather than the target temperature setting. The number of consecutive defrosts before an alarm is triggered can be configured on the DMTouch.
If a defrost cycle terminates based on the maximum time setting as opposed to the target temperature, it may indicate that the evaporator has not cleared all ice from the refrigeration unit, which may subsequently affect performance, efficiency, and power draw. Additionally, there is a defrost limit setting which produces an alarm if an evaporator runs more than a pre-set number of defrost cycles per day.
In addition, we offer two further eco-conscious features: Pack Shutdown Support (intelligent load shedding) and Calculated Product Temperature Alarm Functions.
Energy Saving for BMS/HVAC Applications
For building management projects, the DMTouch can be configured to monitor metered consumables like water, gas, and electricity. This enables the device to provide consumption statistics, predict budgets, provide warnings and display trends on the device’s display. Energy information can also be mapped to graphical profiles.
The DMTouch can be set up to monitor ‘consumables’ usage and display the data in a user-friendly format. It can calculate savings or overspending from the user’s budget and provide detailed analysis of usage. Tabulated views offer a varied analysis of weekly/monthly/yearly usage and spending along with live data and graphing.
At any one time, two consumable sources (e.g. gas, electricity, water) can be logged on to one DMTouch for usage in the Energy Monitoring dashboard. A dedicated settings page within the Data Manager software enables the user to set energy devices, power units, cost per unit, etc. and graph parameters for colour coding.
Mix and Match for your Project
At RDM you only pay for the features that you need, and so each of our temperature control energy-saving features can be added on a mix and match basis, depending on the needs of your project.
To learn more about DMTouch energy-saving features, contact your account manager or our friendly sales team.
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