Overview of Central Air Conditioning Principles

System Overview

Generally speaking, the traditional central air-conditioning system of Shanghai central air-conditioning project is composed of three parts, namely, cold and heat source, cooling and heating pipe network, and HVAC user system. The so-called cold and heat source is a thermal system that combines various equipment to prepare refrigerant or heat medium through pipelines; the cooling and heating pipe network is the main artery that transports refrigerant and heat medium, and the cold and heat medium prepared by cold and heat sources are transported to Users; HVAC users.

System principle

It produces air-conditioning cold (hot) water through the host, which is delivered to each terminal device in the room by the pipeline system, where the cold (hot) water and indoor air exchange heat at the terminal device, thereby eliminating the cold (heat) load of the room air-conditioning. Realize the purpose of cooling and heating. Generally divided into air-cooled heat pump cold (hot) water air-conditioning system and water-cooled chiller refrigeration air-conditioning system.

Principle of air-cooled heat pump cold (hot) water air-conditioning system:

In the traditional central air-conditioning system, after cooling the host condenser refrigerant by the fan, the refrigerant absorbs the heat of the medium water in the main evaporator, turning the medium water into low-temperature chilled water (or warm water), which is used for chilled water (or warm water). The water pump circulates to the indoor terminal device, where the cold (hot) water exchanges heat with the indoor air.