Principle of Central Air Conditioning Billing System

The central air conditioning billing system calculates the energy consumption of each level of the central air conditioning fan coil by measuring the air conditioning usage time of each level of the central air conditioning fan coil during the effective time of the air conditioning (when the water supply temperature T ≤ 12 ℃ or T ≥ 40 ℃), and multiplying it by the measured cooling capacity (heat exchange power) of each level of the central air conditioning fan coil. After adding up the energy consumed by each level of the central air conditioning fan coil unit and multiplying it by the energy unit price, the requirement of "charging according to demand and quantity" can be achieved.

The good applicability of the central air conditioning billing system has no special requirements for the design and installation of central air conditioning systems, and is widely used in residential buildings, office buildings, and other central air conditioning systems with fan coil units as the end.

Structure of Central Air Conditioning Billing System

The central air conditioning billing system includes: a central air conditioning billing device; CRS485-D Area Manager; CJ-3000 billing host; The billing management software has a system topology diagram as follows:

Central air conditioning billing device

The central air conditioning billing device adopts RS485 communication for centralized meter reading management, accurately identifying the operating gear of the fan coil unit and measuring its "effective" time. It uses management software to automatically calculate the central air conditioning energy consumed by each fan coil unit according to the set program. It has functions such as data statistics, bill output, list query, and arrears prohibition, and is suitable for any central air conditioning system with fan coil units as the terminal!

It has functions such as status collection, household measurement, centralized monitoring, arrears prohibition, and on-site display (optional).　

CRS485region manager

CRS485The area manager has communication relay and partial host functions, and can work independently without the host. It is the basic unit of energy metering management system module management. Detect the temperature of the air conditioning supply water in this measurement area and automatically adjust it based on the measured value and the set temperature valuedirectionCFThe P-type lower computer issues the command to start or stop timing.

Billing host

The billing host is the bridge of the entire energy metering management, with terminal management, data caching, scheduled meter reading, and real-time monitoring functions.

CJ-3000On the one hand, the billing host receives various instructions from the management work center computer, andwarpCRS485Under the Regional ManagerTransfer to the lower computer (billing or meter reading device); On the other hand, it will collect various information from the lower computer and transmit it back to the management center computer. At the same time, it will also store relevant parameters such as data from the meters under the jurisdiction of this system, and have the ability to periodically copy data from the lower computer, monitor the working status of the lower computer in real time, and issue fault alarms.

Billing management software

Humanized human-machine interface design and operationwhatWin/NThe T platform adopts advanced data processing technology and provides a cost accounting module, which can set various parameters such as timed meter reading, remote control, and time-based billing. The settings are flexible, the functions are complete, the information organization is reasonable, and the operation is convenient.

system implementationFunction

1 Charged to each account, the controllable prepaid management function automatically shuts down and disables users who fail to pay on time.

2“Effective collectionfee”The principle not only ensures the air conditioning effect for users, but also includes the cost of poor air conditioning effect when users use it, which is conducive to promoting property management efficiency improvement.

3The usage list truthfully records the operating time of each level of the user's fan coil unit, making the charging more transparent and easy to understand.

4Automatically count and print daily expensesmeasure/Expense report, monthly usemeasure/Expense report, convenient for the property management department to understand the usage of central air conditioning. Query and print user monthly payment receipts and payment lists to improve the credibility and persuasiveness of fees.

5The automatic monitoring function of the system not only provides a clear understanding of the usage status of all users, but also emits an audible alarm when there is a malfunction or someone steals energy from the system.

6The time-based billing function provides convenient services for users who use or implement time-based electricity prices during different time periods.

7advancedhaveRS48The 5 communication methods have expanded the compatibility of the system, making it easy to remotely and automatically read water meters, electricity meters, and gas meters without the need for additional wiring.

8The self diagnostic recovery function and anti-interference design make the system run more stably and reliably.

9Measurement historical data can be used as a basis for energy consumption analysis and energy-saving monitoring, meeting the needs of developing reasonable operational management processes.