Would you consider holding the relay coil on with a capacitor? What is the application, how many poles and what is the nature of the circuit that turns on the relay?
TBP,
The air pressure was applied to the copper water passages in 50KW induction generators to dislodge the "stuff" that the bugs living on the copper had built up. Looked a lot like what would come out of a clogged sewer pipe, but smelled slightly better. Why 120 PSI? Well, 100 PSI would...
We had an "infection" with our closed loop copper water cooling system. This system was not open to the atmosphere. The bug lived on copper. A biocide had to be added to kill it. Some pipes were blocked and had to be blown out with 120 PSI compressed air. The company that checks our system...
billyg,
What overcurrent device is tripping? The CB feeding the variable frequency drive (VFD) or is the VFD shutting down on over current?
I agree with others that low air resistance will cause the motor load to go up with a FC blower.
However, the VFD may not be providing the correct Volts...
The way I read this question is:
How much horsepower is needed to turn the compressor per ton (12,000 BTUH, cooling) of refrigeration capacity?
The old rule of thumb is one horsepower per ton. Most modern systems do better, especially those with larger capacity. If the EER rating is known...
Slightly off topic, but may be helpful...
I assume you want to recover superheat energy. If so, consider a liquid line to suction line (LLSL) heat exchanger. This improves the COP of R134a systems and increases the superheat temperature and energy. The LLSL COP increase with R134a is...
Liquid line to suction line (LLSL) heat exchanger...
The benefit is a strong function of the refrigerant used. LLSL heat exchange helps little with R22 with regard to COP. It helps COP a lot with R134a, especially if the condenser-evaporator delta T is large. If compressor superheat is being...
If you go to a variable frequency motor drive, make sure the motor is "Inverter Duty" rated. If it is unreasonable to change the motor, a filter between the drive an motor may help. If the application reliability is critical, an inverter duty motor and filter may be considered.
Boyceg
We use a WW Grainger constant pressure valve on small systems. The constant pressure is maintained at the evaporator. An accumulator is suggested to protect the compressor for low load operation. If the temperature difference between the condenser and evaporator is large, consider a liquid...
I am new...
Copeland has a compressor selection system that you can download and look at compressors all sorts of ways. Careful, it can eat up a lot of time...
Scroll compressors from Copeland come in high temperature, medium temperature and low temperature designs. Looks to me like you...
