Introduction: Over the years, more and more units have used the dust-proof sheds to construct subways. With the continuous advancement of environmental protection supervision and management in Beijing, the qualified standard for the construction of Beijing subway construction dust can be described as high sesame blossom. Recently, the Beijing Municipal Housing Construction Committee jointly issued a "Notice on Promoting the Implementation of the Dust-proof and Sheltering Shelter for Open Pit Excavation of Rail Transit" jointly with related departments. The "Notice" requires that, as of May 1, 2018, a dust-proof isolation shed be applied to open pit excavation in rail transit projects. This move means that the Beijing subway construction site will bid farewell to the traditional open-air construction methods. There is no doubt that higher standards and stricter requirements have been put forward for the construction of the Beijing subway.
The "Notice" clarified the specific work goal is to set up a three-dimensional dust suppression and dust removal equipment facility in the dust isolation shed, and the dust reduction rate (the ratio of the average concentration of dust pollutants outside the shed and the shed) at the construction site meets the eligibility criteria. In order to achieve the construction operating environment in line with occupational health standards.
However, when it comes to construction site dust reduction, it has to mention spray dust system. The spray dust-removing dust system absorbs dust particles by spraying water mist so as to increase its weight and settle. It can perform three-dimensional automatic dust reduction and dust suppression in a limited construction work area. Due to the adoption of wet dust-removing means, it can be supplemented with air-feeding dust collection equipment to prevent secondary pollution of dust.
According to the specific requirements of construction dust reduction, the spray dust reduction system can selectively select high-pressure spray systems, low-pressure spray systems, long-distance spray gun systems, and moving dust cannons.
The spray dust-reduction system consists of main control system, pump station unit, nozzles, pipe fittings and other components. According to the construction site environment layout planning, easy disassembly and maintenance, is a more economical way of construction site dust reduction.
It can be foreseen that with the inclination of environmental protection policies and the improvement of construction standards, the future development prospect of spray dust-reduction systems is still very broad.
Water Loop Heat Pump
Cooling capacity 2.5kW-45kW
Advantage: Packaged type water loop heat pump to save space; High efficiency; Installation very easily and low noise. Split type water loop heat pump(optional).
Characteristics:
1.Structure. Galvanised steel construction, closed cell foam lined compressor and fan compartments, with an insulated and powder coated drain tray for complete moisture protection, the drain tray is easily removed for inspection and cleaning.
2.Refrigerant. Each heat pump Air Conditioner is factory charge with refrigerant R410a, which is deemed to have zero ozone depletion potential.
3.Hermetic compressor. Single phase rotary compressor is used for this heat pump unit, with built-in thermal overload cut-out, mounted on rubber vibration dampers.
4.Centrifugal fan. High efficiency, double inlet centrifugal fan. Protection level IP44. Low noise, low speed, big air flow and high ESP.
5.Water side heat exchanger. High efficiency coaxial heat exchanger, factory insulated with flexible close cell material.
6.Air filter. An optional filter integrated return air spigot is available on all models. The filter is a washable polypropylene net media. Care should be taken, when location each unit, that to enough space is provided to enable the one-piece filter to be withdrawn to its full length from either side of the heat pump air conditioner.
7.Electric heater(optional). For cooling only version. Electric elements have spirally wound stainless steel fins to give increased area and low surface temperature. They are totally enclosed within the water cooled packaged chiller and are supplied with safety cutouts. An optional fan run-on timer for rapid heat dissipation is available.
8.Electric panel. Consists of:
Compressor contactor
Compressor protection breaker
Microprocessor with function display
9.All models are equipped with wire controller with the following features:
♦ 7days programmable timer
♦ Auto random reset
♦ Error self diagnostic
10.Safety protection. High pressure switch, low pressure switch, discharge temperature protection and anti freezing protection.
Water Loop Heat Pump
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Jinan Amrta Air Conditioning Co.,Ltd , https://www.amrtaac.com