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References in periodicals archive ?
What is the optimum compressor discharge pressure setpoint for condensers?
The effective COP of the holdback valve system can be calculated from the amount of additional heat reclaimed during low ambient conditions divided by the additional energy consumption generated by the increased compressor discharge pressure during those conditions.
Once these measures were implemented, the compressor discharge pressure was reduced from 120 psig to 100 psig, lowering the system pressure to 95 +/- 5 psig.
When compressor discharge pressure exceeds impeller discharge pressure, gas backflow occurs until the compressor discharge pressure become less than impeller discharge pressure.
To date, the engine has been started up, run normally, and shut down only on a specially designed test bed, on which rotational speed, exhaust temperature, compressor discharge pressure, thrust (static), bearing and oil temperature, and fuel pressure and temperature can be measured.
Forcing the compressor discharge pressure up during defrost (perhaps to make sure that the gas really is "hot") wastes compressor power for the whole system and overheats the metalwork in the air cooler, increasing the cooling required to restart the system.
As stated previously, the compressor discharge pressure in the VapCyc model was fixed at the experimentally measured value given in Table 1.
VapCyc Inputs Variable VapCyc Model Input Compressor Cooling Load [W] 96.2 Compressor Discharge Pressure [kPa] 1,095.4 Evaporator Air Inlet Temperature [[degrees]C] -10.2 Evaporator Volumetric Air Flow Rate 0.0212 [[m.sup.3]/s] Evaporator Air Inlet Relative Humidity [%] 74.5 Condenser Air Inlet Temperature [[degrees]C] 32.8 Condenser Volumetric Air Flow Rate 0.0283 [[m.sup.3]/s] As was shown in Table 2, the VapCyc model outputs for several key parameters were within 6% of the experimentally measured values.
During the 1990s, many turbocharger original equipment manufacturers and aftermarket companies developed turbocharger upgrade packages that modified the compressor and/or turbine wheel so as to increase the compressor discharge pressure within the same turbocharger case.
Adriansyah (2004) experimentally studied the effect of compressor discharge pressure for simultaneous air-conditioning and water heating.
However, for a maximum COP there exists an optimum compressor discharge pressure corresponding to the gas cooler outlet temperature (Figure 4).
As the temperature drops toward evening, the compressor discharge pressures may drop to 140 to 150 psig (9.7 to 10.3 barg).