Central air conditioning quality appraisal

central air conditioning system is widely used in various types of buildings, such as commercial buildings, office buildings, hotels, hospitals, public transportation and residences. It can not only provide comfortable temperature, but also maintain appropriate humidity and air quality, creating a healthy, safe and efficient working and living environment for people. At the same time, the centralized cooling or heating method of central air conditioning can also save energy and improve energy efficiency.
The design and operation of central air conditioning systems have an impact on the environment, including energy consumption, greenhouse gas emissions and air pollution. In order to reduce energy consumption, the central air-conditioning system can use efficient refrigeration or heating equipment, and reduce energy waste through reasonable design and management. In addition, the central air conditioning system can use renewable energy as its energy source, such as solar hot water, ground source heat pumps, etc., to reduce dependence on traditional energy.
In central air-conditioning quality appraisal cases, Zhongke Testing can provide central air-conditioning quality appraisal services.

Mainstream central air conditioners can usually be divided into multiple unit categories such as centrifuge, air-cooled screw machine, water-cooled screw machine, module machine, multi-split machine, unit machine, lithium bromide, water-to-ground source heat pump, etc.
can be mainly divided into electric refrigeration and thermal refrigeration according to the energy method. Most of the central air conditioners are electric refrigeration, and lithium bromide central air conditioners are thermal refrigeration, which are mainly used in the industrial field.
In electric refrigeration central air conditioners, the centrifuge, air-cooled/water-cooled screw machine and modular machine use water as the refrigerant, which is a "water machine" in the usual sense. They are mainly for commercial use, and some small household chillers are also used for home use.
multi-split and unit machines use fluorine as the refrigerant, which is a "fluorine machine" in the usual sense. They are widely used in household scenarios and small and medium-sized commercial scenarios.

GB/T 39434-2020 Technical requirements for ozone-treated central air-conditioning circulating cooling water
GB/T 31349-2014 Technical requirements for energy-saving measurement and verification Central air-conditioning system
GB/T 26759-2011 Technical specifications for energy-saving control devices of central air-conditioning water systems

was entrusted by a public security bureau to conduct a quality analysis on the "central air conditioner" involved in the case. The purpose of the central air conditioner quality appraisal analysis is as follows:
conducts physical evidence appraisal on whether the installation of the central air conditioner involved meets relevant standards and whether there are quality problems with the central air conditioner involved. The
expert group conducted an on-site inspection on the "central air conditioner" involved in the case, conducted verification tests and comprehensive analysis on the on-site inspection, laboratory evidence testing data and results, and relevant national standards, and concluded that the quality appraisal opinion of the "central air conditioner" is:
(1) Involved The installation of the central air conditioner in the case showed that many joints of the refrigerant pipeline were not wrapped with insulation materials, the insulation layer ties fell off and water entered the compressor, which did not meet the requirements of relevant national standards;
(2) The central air conditioner involved in the case had quality defects such as a small width of the duct machine tray and other relevant physical evidence identification conclusions.