Overview of Air Conditioning System

I.Current Basis for Central Air Conditioning System Metering:

Article 27 of the "Energy Conservation Law" stipulates that energy-consuming units shall strengthen energy metering management, and equip and use legally verified and qualified energy metering instruments in accordance with regulations. The industry standard "Technical Specification for Engineering of Centralized Air Conditioning Electronic Billing Information Systems" clearly specifies the "two-part tariff model composed of a basic unit price and a metering unit price."

II.Central Air Conditioning System Metering Methods:

1. Energy-Based Central Air Conditioning Metering Method:

Principle Calculation Formula:

2. Time-Based Central Air Conditioning Billing Method:

2.（1）Principle of Time-Based Billing

2.（2）Schematic of Time-Based Metering Installation:

3. Expandable Functions:

① Air conditioning billing function / centralized meter reading;

② Control function, remote timed startup and shutdown;

③ Remote temperature locking and energy saving;

④ Equipped with an electronic thermostat, large LCD screen, and on-site display of usage time;

⑤ Prepaid function, on-site display of balance, arrears reminder;

⑥ Query and billing management;

⑦ Alarm functions for theft, detachment from metering, etc.

4.Comprehensive Comparison of Time-Based and Energy-Based Metering:

II.Relationship Between Air Conditioning Metering and Billing:

① Metering is the foundation; billing and energy saving are the core;

② The essence of central air conditioning billing is the reasonable allocation of costs;

③ Blindly pursuing excessively high precision will increase costs;

④ Choosing the appropriate solution for different projects is reasonable;

⑤ System stability, reliability, and ease of maintenance are, to some extent, more important;

Central air conditioning metering and billing are first a management issue, then a metering equipment issue, and constitute a service system.

IV. Billing Introduction:

The two-part tariff method, based on a basic unit + metering unit price, is a national policy and industry-oriented billing model, which is relatively reasonable and the most common model.

This billing method is suitable for all property areas. The determination of the billing ratio and unit price is the key and challenge of the billing method.

There is currently no unified standard for determining the billing ratio and unit price. Different manufacturers have their own calculation methods, and the baseline may vary depending on the characteristics of each project.