How to improve the energy efficiency ratio of condensing recovery units? Direct answer: The low energy efficiency ratio is mostly due to the operating range and heat dissipation conditions, rather than the equipment itself being inadequate - as the condensation temperature increases, the refrigeration coefficient decreases accordingly; The low load rate causes the compressor to deviate from the efficient working area, resulting in a significant increase in electricity consumption per unit of refrigeration capacity; The dirty and blocked heat exchange surface pushes up the condensation pressure. Four things to improve efficiency: control the condensation temperature within the design range, increase the load rate to the high-efficiency zone, regularly clean the heat exchange surface, and perform condensation heat recovery when conditions permit. The energy-saving account should be calculated based on actual operating conditions, not just the nominal energy efficiency ratio value of the equipment.
Energy efficiency is extremely sensitive to operating conditions. Once the condensation temperature increases, the refrigeration coefficient decreases: raising the condensation temperature from a lower range may reduce the energy efficiency ratio by more than 20%, which is a considerable decrease. Another major factor is the load rate. When the compressor operates at low loads, the refrigeration coefficient will drop to a fraction of the rated value, resulting in significant energy efficiency losses at partial loads. The heat exchange surface is dirty and blocked, and the finned condenser is not cleaned for a long time, resulting in a decrease in heat dissipation efficiency and a corresponding decrease in refrigeration coefficient. The combination of these three types of problems quietly led to an increase in electricity bills.
The condensation temperature directly determines the energy efficiency ratio: the lower the temperature, the more energy-efficient the unit cooling capacity, but too low a temperature can result in insufficient cooling capacity. The method is to stabilize the condensation temperature within the design range, neither too high nor blindly low. Cooperate with the management of cooling water temperature and flow rate to ensure that the condensation pressure falls within a reasonable range. When selecting, don't just look at the rated cooling capacity. You should calculate the maximum ambient temperature in the local summer based on the operating conditions, otherwise the nameplate energy efficiency ratio will not be achieved in actual summer.
The economic operation of compressors has clear upper and lower limits, and the energy efficiency ratio drops sharply beyond the operating range. To maintain the system operating within a relatively efficient load rate range, it is necessary to divide the cold storage or process into independent circuits according to temperature requirements, and turn them on as needed instead of cooling all loads at the same time. In this way, each compressor can operate within a more efficient load rate range, avoiding long-term low load idling or long-term full load hard carrying. Optimizing operational strategies is often more effective than simply changing devices.
The cleaning cycle of the heat exchange surface is directly related to the heat dissipation efficiency: the cleaning cycle should be determined according to the hardness of the local water quality, and it should be shortened in areas with high hardness. Condensation heat recovery is a large-scale renovation project that uses the heat discharged by the unit to produce hot water or preheat the feed, which can recover a considerable proportion of condensation heat. The smaller the modification to the existing system, the easier it is to implement. But it should be noted that the power consumption of the recycling system itself should also be taken into account, otherwise half of the recovered heat will be consumed by itself, and the net energy-saving effect will be discounted.
| Segment | Method | Energy-saving effect | Attention |
|---|---|---|---|
| Condensing temperature | Stable within the design range | The energy efficiency ratio has rebounded | According to summer working conditions |
| load rate | Press into the efficient zone | Avoid inefficient idling | Open the circuit as needed |
| heat exchange surface | Wash according to water quality | Restore heat dissipation | Hard water shrinkage cycle |
| Heat recovery | Waste heat for hot water production | Recovering some heat | Calculate the electricity consumption for recycling |
Not the lower the better: too low will result in insufficient cooling capacity and unstable unit operation; Stabilizing the temperature within the design range is the most cost-effective, as too high or too low can damage the energy efficiency ratio. Adjust the temperature within this range to achieve the most stability.
When the compressor operates at low loads, the refrigeration coefficient will drop to a fraction of the rated value, resulting in significant energy efficiency losses at partial loads; Open the circuit as needed to allow the equipment to work more in the efficient area.
Check the hardness of water quality, and shorten the cycle in areas with high hardness; Long term non washing leads to a decrease in heat dissipation efficiency and a synchronous decrease in energy efficiency ratio. Therefore, cleaning should be included in the regular plan based on water quality and wait for an alarm before stabilizing the process.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
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