Regularly check the settings of control because they can drift over a period of time. The idea is to have the software and locking the settings with a password.
Clean Up Contaminated Heat Exchangers
Inefficient operation of refrigerating machines, usually due to fouling of capacitors. It occurs, as a rule, due to lack of water treatment or poor condition of water treatment methods. Scaling of condenser pipes reduces the heat transfer efficiency, increasing the temperature and pressure of the refrigerant in the condenser, reduces the cooling capacity, increases the power consumption of the compressor. If this problem is ignored, it can also lead to disable compressor high discharge pressure. Chemical cleaning of heat exchangers is necessary to maintain the efficiency of heat transfer. On-line monitoring and dosing systems for water purification, this can provide a scale free work on a permanent basis.
In the case of evaporative condensers, cleaning of air side of the condenser tubes helps in maintaining good heat transfer efficiency.
Unit coil tubes and fins should also be regularly cleaned externally.
Specify the Relevant Fouling Factors for Capacitors
Fouling factors are considered in the design of the heat exchanger oversized heat exchangers to compensate for the effect of fouling. However, suppliers of equipment, as a rule, consider fouling factor 0,0005; good water treatment program is required to contain fouling within this limit. The usual size of CaCO3 only 0.6 mm equivalent fouling factor 0.002. Studies have shown that by 0.6 mm scale may lead to a loss of power around 20%. The absence of water treatment programmes or poorly managed water treatment programs can very easily lead to the scale of this magnitude. Therefore, a proper selection of heat exchangers on the basis of realistic fouling factors and scientific processing of the water program (on the basis of regular water quality measurements) are essential to maintain the efficiency of the cooling system.
Cleaning The Air Condenser
Air and other non-condensible gases may enter the system leaks via seals, gaskets or no caps valves. Air can also be due to imperfection of the evacuation before booting the system or because of impurities in the refrigerant and oil.
Not condensibles in capacitors add the partial pressure of the refrigerant vapout and thus increase the pressure against which the compressor should work. Heat transfer coefficient also drops as a refrigerant diffuse through non-condensibles to the surface of the tube before condensation.
The methods used for exhaust air:
Direct vent air-mixture of the refrigerant which is a primitive manual technique
A small compressor draws a sample of the refrigerant gas and compresses the mixture condensation more refrigerant and cooling vents mixture of vapors that the wealthy non-condensibles
The low temperature of the evaporator, the built in system condenses the most refrigerant refrigerant-air mixture is taken from a capacitor or a receiver and air vents are not condensibles. This method does not require a separate compressor and widely used.
Cleaning non-condensibles plays an important role in maintaining the efficiency of refrigerating machines.
Do Not Overcharge Oil
Check the oil level in the compressor through the sight glass on a regular basis. As above or below the level of oil can damage the capacitor. Falling oil level implies leakage or infringement of oil in other parts of the system. Excessive oil can result in a movie in the formation of the heat exchangers can reduce heat transfer significantly and increase the operating time and energy consumption.
Pump Systems
Some methods to reduce power consumption of pumping systems are:
The increase in temperature drops of liquid to reduce the speed of downloading. After the critical study requirements, it can be experimentally done via regulating valves. Variable speed drives can be programmed to maintain a constant temperature difference between the heat exchangers.
Balance system to minimize the threads and reduce the pump power requirements. In systems with hot and cold water, over flow from one to another, should be reduced to a minimum
Use small pumps for small cargoes requiring higher pressures, instead of raising the entire stream of high pressure.
Use the siphon effect advantage: nott waste pumping head free fall back. This can be determined by measuring the pressure of the chilled water / coolant cooling water return line close to the discharge point.
Work pumps near their best efficiency point. Both the regulation of the valve excessive circulation flow can move the pump from the point of optimal leading to a significant decrease in efficiency.
Change pumps to minimize regulation. This may require changes or pumps, impellers.
Adapting to a wide changes in flow with variable speed or sequential control of smaller units.
Repair of seals and packaging of water to minimise waste, especially chilled water.
Fans/Blowers
The following points are useful to reduce the energy consumption in blowers and fans.
Chillers