Big Bitcoin mining machine evaluation Ant S19 Pro
Big Bitcoin mining machine evaluation Ant S19 Pro
At the end of February 020, Bitmain released the S19 Pro mining machine with a rated computing power of 110T±3% and a wall power consumption of 3250W±5%. As of the end of May, the 19 series of mining machines have been shipped to various mines. After the mining machine was operating stably for a period of time, our personnel arrived at a mine in central Inner Mongolia. After four days, the actual operation of the S19 Pro mining machine was measured on site.
1. Local climate and mine inlet temperature
According to historical weather data, from June to August 2015-2019, the highest temperature records in this region are 32℃, 31℃, 36℃, 31℃, 31℃. The mine is located in an industrial park, and the air flow is side-in and top-out. If the maximum temperature of the environment in summer is calculated at 34°C, according to the characteristics of the heat source of the mine, the maximum temperature of the factory’s summer inlet air should not exceed 37°C, passing through the water curtain The air temperature should not exceed 31℃, and the relative humidity should be between 30-80%.
2. Introduction to the mining machine
The S19 Pro mining machine is an integrated design of the chassis and power supply. Its bare metal size is 370×195.5×290mm. It can be placed horizontally or vertically according to the height space of the mine shelf; the mass is 13.2kg.
The heat dissipation of the mining machine is designed with front and rear double-tube fans, and the outer surface of the fan is equipped with a mesh cover, which ensures that the mine operation and maintenance personnel avoid accidentally touching the blades and cause injury, which protects the safety of the operation and maintenance personnel; the back of the fan is covered with a grille, which effectively prevents Foreign particles enter the high-speed rotating fan and hit the hashrate board.
The voltage of a single fan is 12V, the current is 1.65A, the maximum speed is 6150rpm, and the maximum air volume is 197cfm. According to the changes in the series and parallel characteristics of the fans, the single-sided parallel fan design of the miner significantly increases the ventilation; the series design of the fans on both sides of the miner significantly increases the resistance of the miner to environmental resistance, that is, the ventilation of the miner will not follow the mine. The changes in the field environment fluctuate sharply.
The internal computing power board of the mining machine uses a whole heat sink to dissipate heat. The heat sink is of streamline design. Although the wind resistance cannot be effectively reduced, this heat sink design effectively increases the heat diffusion area of the chip, making the chip The generated heat can be evenly and quickly transferred to the heat sink and be taken away by the wind in time.
3. Measured data of mining machine operation
On-site personnel select a mining machine under a certain position of the shelf for testing, and obtain the following data through the monitoring background.
The air inlet temperature of the S19 Pro miner is 23.1℃, the relative humidity is 70%, and the air outlet temperature is 38.8℃; the relative humidity is 32%, the average air volume is 370cfm; the power outlet air temperature is 28.0℃. The overall power consumption of the S19pro mining machine is 3320W, and the mining machine control page shows an average computing power of 111.8TH/s, so the power consumption ratio of the S19 mining machine is 29.69W/T.
The effective computing power of S19 Pro on the mining pool side is also amazing. The backstage of ViaBTC shows that the effective computing power averages about 111 Th/s. After accessing the "firepower machine gun pool" and turning on the "hourly redemption" function, the profit is the highest Compared with the traditional PPS+ model, the increase can reach 23.99%. The figure below shows the calculation of the income obtained by different accounts through ViaBTC.
The influence of changes in air volume and air temperature on the operation of mining machines
According to relevant statistics, 45% of electronic products are damaged due to high temperature. The high temperature problem in the mine is mainly due to insufficient ventilation, which causes the temperature of the air outlet of the mining machine to increase. In order to obtain the operating status of the mining machine in different ventilation environments, the on-site personnel observe the change of the mining machine's computing power by changing the air flow through the mining machine. The results obtained are as follows.
When the air inlet temperature of the mining machine is fixed at 31°C and the air volume of the mining machine is reduced from 370cfm to 190cfm, the mining machine’s computing power does not fluctuate significantly, and it remains at about 111.4TH/s. Continue to reduce the air volume, and the mining machine calculates The force begins to become unstable. The ventilation rate of the miner is further reduced to 170cfm, and the miner is protected against high temperature. Therefore, for this mine, the actual ventilation volume of each S19pro mining machine should not be less than 190cfm.
Corresponding to different air volume, the temperature environment of the operating mining machine is also different. As the most typical data indicator, the relationship between the air temperature of the air outlet of the mining machine and the computing power is shown in the figure below. The figure shows that the air temperature of the air outlet of the mining machine should not exceed 61°C in actual operation.
The influence of the temperature fluctuation degree of the air outlet on the operation of the mining machine
In addition to the air temperature limit of the air outlet that the mining machine can withstand, the fluctuation of the ambient temperature also has a certain impact on the operation of the mining machine. The on-site personnel increased the temperature of the air inlet of the mining machine from 22°C to 40°C at different times to observe the change of the mining machine's computing power, and finally obtained the following data.
It can be seen from the curve that the temperature fluctuation of the inlet air of the mining machine changes from 0-3.6℃/s, and the change of the mining machine's computing power is small, which means that in the summer environment, the mining machine's computing power is hardly affected by the change of the temperature environment.
The impact of environmental humidity changes on the operation of mining machines
On-site personnel observe the change of the mining machine's computing power by controlling the humidity of the air inlet of the mining machine, and finally obtain the curve of the mining machine's computing power with the humidity of the air inlet of the mining machine.
It can be seen from the curve that when the relative humidity of the inlet air of the miner is within the range of 30%-90%, the operating power is 111.7-111.8TH/s, which is the normal operating power. This shows that the change in the relative humidity of the plant in a short period of time has little effect on the operation of the mining machine.
other
Mining machines at different locations in the mine have a great difference in the air flow field environment, and the air volume obtained by the miners varies greatly, which directly affects the temperature of the air outlet of the mining machine. In order to ensure that the temperature of the air outlet of the mining machine is maintained within the appropriate range, the mine should calculate the air flow field of each machine position during the design process, and design a water curtain or other equipment to reduce the summer air inlet temperature of the mining machine. During operation, the distance between the mining machine and the water curtain should be greater than 2 meters to avoid water splashing into the mining machine; the workshop should be kept clean, and the number of particles with a diameter of not less than 0.5μm in the workshop environment should be ≤32.5 million particles/m3.
For the mine site for this mining machine evaluation experiment, the ventilation layout is reasonable, the inlet air temperature is low, it is calculated that the hot air out of the mining machine in summer does not exceed 47 ℃, the operating environment of the mining machine is good, and the relative humidity and dust particle concentration are good. Keep it within an appropriate range.
4. Summary
The integrated design of S19pro makes the structure more compact and reasonable.
The heat design of the miner is reasonable, and the combination of fan and heat sink ensures good heat dissipation of the miner.
In the running state, the average computing power of the miner is 111.8TH/s, the power consumption is 3320W, and the actual air volume is 370cfm.
In summer weather, the air outlet of the mining machine can withstand the wind temperature up to 61℃
