Application note
Connected Controller for distributed HVAC Refrigeration Systems
Using NXP microcontrollers, Wi-Fi and Zigbee
Overview
Connected HVAC systems
Modern HVAC systems for refrigeration require a modular approach and multi bus connections. The implementation presented includes: LPC2468 ARM7 microcontroller from NXP, Operating System from Keil-ARM, MMI with graphics library, Ethernet, USB, Expansion to Zigbee, Wi-Fi, Connection to Server (Cloud, Database) .
Solution
The Value of Telemetry in HVAC Systems
Lightweight Data Channel: In distributed Refrigeration Systems, like big supermarkets or point of sale, Bluewind data logging and telemetry relies upon MQTT/ mosquitto software protocol. The system thus obtains optimal efficiency on the data channel, which results in lighter cost for GSM/GPRS data transmission.
Marketing: The refrigerator manufacturer or integrator experiences best return on sales revenue, technical statistics, for example:
- energy saving statistics
- temperature stability
- efficiency
Service: the machine can be diagnosed in advance, before exceeding its temperature range, or well ahead of machine failures and anomalies. Temperature anomalies, system pressure and possibly compressor damage can be diagnosed in advance. Maintenance personnel are optimized and kept updated about machine anomalies.
