The Difference Between Ultra-Low Temperature Air Source Heat Pump And Ordinary Air Source Heat Pump

1. The Difference Between Ultra-Low Temperature Air Source Heat Pump And Ordinary Air Source Heat Pump

Whenever the heating season arrives, most areas in the north will be accompanied by haze. Since the 13th Five Year Plan, the central and local governments have attached great importance to controlling environmental pollution, especially haze. The central government has designated the Beijing Tianjin Hebei air pollution transmission channel and directly subsidized the "2+26" cities from the central government to control haze pollution. So the tide of coal to electricity and coal to clean energy began in the north.

Two or three years ago, most people were not familiar with air source heat pump products. If they had a slight impression, it might be air source water heaters. They had no knowledge of other products, such as air source floor heating air conditioning units, air source heat pump dryers, and so on. With the popularization of "coal to electricity" in the north, most people now know what an air source heat pump is. So, what are the differences between the ultra-low temperature air source heat pump used in the north and ordinary air source heat pumps?

1、 The operating conditions of the two are different

We all know that the working principle of an air source heat pump is to absorb heat from the air, convert it into usable high thermal energy through a compressor, and then exchange it with a water system to provide hot water, heating, cooling, drying and other purposes. The temperature environment for the operation of ordinary air source heat pumps is best within minus 10 ℃. If operated between minus 10 and 25 ℃, it may result in:

1. The compressor is prone to malfunctions: the exhaust temperature rises rapidly, and the superheat of the working fluid is too high. In the case of overheating of the working fluid, the thermal conductivity of the working fluid in the condenser decreases sharply, while the temperature of the lubricating oil rises and the viscosity decreases, affecting the normal lubrication of the compressor.

2. The unit cannot defrost: In frequent rainy and snowy weather and at lower temperatures, the defrosting ability of the unit is easily weakened. Due to the unit's small suction, the density of air that can be sucked in decreases. As time accumulates, the thickness of the frost layer increases. Therefore, the unit will experience a decrease in air conversion capacity, a reduction in refrigerant circulation, and an overall decrease in heating capacity.

2、 The two involve different technologies

Due to the temperature difference between the north and south, most air source heat pump manufacturers are located in the southern Guangdong region. The air source market in the south is extensive, and the earliest product was air source water heaters. With the development of air source, its technology has become increasingly mature, and soon air source heating has also established a foothold in the north. This is also the fundamental reason for the breakthrough growth of coal to electric air source heat pumps in the north in the past three years.

What kind of technology can low-temperature air have to establish a foothold in the cold northern regions? There are three main points:

1. Ultra low temperature air source operation technology: Air source heat pump manufacturers have their own ultra-low temperature technology. As the main unit of the air source heat pump is usually installed outdoors, frost formation occurs frequently in rainy and snowy weather. The ultra-low temperature air source heat pump host can intelligently determine the need for defrosting, based on the operating conditions of the unit (running time, exhaust temperature, etc.), combined with the ambient temperature and frost thickness, to intelligently determine whether defrosting is necessary, achieving defrosting with frost and not without frost, greatly extending the defrosting cycle, shortening defrosting time by 20%, and ensuring efficient operation of the unit.

2. Jet enthalpy increasing technology: Due to the significant decrease in heating efficiency of air source heat pumps in extremely cold weather, the heating effect is not ideal. Ultra low temperature air source heat pumps use jet enthalpy increasing technology to create a second suction port in the vortex plate, increase the refrigerant flow rate through the second suction circuit, and increase the unit circulation during cooling, which increases the cooling capacity by 10% compared to general units, greatly improving the refrigerant circulation system, fully utilizing the refrigerant flow rate and utilization rate in the compressor, and improving the stability and heating efficiency of the system operation.

3. Coil shell heat exchanger: Ordinary air can use plate heat exchangers, which are prone to scaling and blockage of flow channels. Low temperature air can use internally threaded and externally finned copper tubes, with water flowing inside the tube and fluorine flowing outside the tube. The heat transfer area is large and the heat transfer efficiency is high.