TThe article in view of the central air conditioning aqueous system universal existence\'s scaling,the corrosion and the fungus algae question,the union new water treatment product,proposes the practical and feasible processing method.

The system of water source heat pump is complicated and energy-intensive with many kinds of environmental impact.

Small central air conditioning system design of Variable Refrigerant Volume (VRV);

A historical cohort study was carried out by comparing levels of sero antibodies against Legionella pneumnophila of 414 workers who were taken as the exposure group under central air conditioning systems with 414 controls from the general poputation as the non exposure group.

A new central air conditioning system,ground-source heat pump,is put forward in this article.

Analysis of applying inverter technology to water pump in central air-conditioning system;

Energy-saving methods for central air-conditioning system;

The study of operation process and object characteristics of central air-conditioning system

Four kinds of cold and heat source systems are introduced, including heat-electricity-cold triplet supplier, hot pump system for surface water, ice-activated cold air condition system, as well as traditional central air condition system with frequency and capacity converters, with the energy-saving effects of each of the systems compared.