As a leading engineering institution in air conditioning high quality products, Petra is proud to introduce its revolutionary design for its new line of Variable Speed Drive Chillers to meet not only the current but also future requirements of efficiency, reliability and sustainability
Petra chilled water equipment established their place in the market, as a highly efficient ultra-low sound AHRI / Eurovent certified system. And now with global concern regarding energy and premium efficient products, Petra is introducing its new variable speed drive chiller series with screw compressors, specially designed to reduce energy consumption at part load with superior efficiency
APSG VFD Screw chillers are the ultimate solution for commercial and industrial applications with high efficiency part load performance and Ozone friendly refrigerants
Petra`s VFD controlled compressor series is AHRI / Eurovent certified and in accordance to the latest ASHRAE 90.1 standards in terms of efficiency and part load performance. Petra`s superior efficiency at part load can reach up to an IPLV value of 5.85 (kW/kW) in the high efficiency versions
- VFD on one compressor or VFD on each compressor option
- Wide range of capacities as the compressor works with variable speed to meet the customer requirements for a variety of applications
- Silent operation for sound sensitive projects, as this series has been specially designed with sound sensitive environments in mind. Sound power levels at full load operating conditions are low
- Compact APSG design to keep installation space at the minimum so it’s deal for both new and retrofit projects. In particular the highly efficient compressor with its integrated inverter allows us to mount more compact heat exchangers in the frame and combined with the interfaced compact control panel, deliver more power from reduced footprint
- Simple to install even simpler to maintain, as APSG chillers are wired at the factory and are also precommissioned with the unit’s software tuned and set points already established. They also integrate easily with exciting building management systems. So on site all that is required is to plug the unit into the power supply, connect any pipes and wires, and switch the unit on
- High energy efficiency performance on Integrated Part Load Values (IPLV)
- Variable speed screw air cooled chillers increase the IPLV value to 20-25% better performance and power
- Soft start provided as standard to reduce power in-rush at start-up
- Rotor profile designed for maximum efficiency at higher speeds
- Compact, high-efficiency, integrated low refrigerant charge evaporator design
- Variable – primary flow chilled water system that varying the water flow reduces the energy consumed by pumps while having limited effect on the chiller energy consumption
- The rotary screw compressor is semi-hermetic, direct drive with capacity control via a variable speed drive, rolling element bearing, and differential refrigerant pressure oil flow and oil heater
- Inverter screw compressor run most efficiently at partial loads, using only the power necessary to match the load required traditional inverter driven unit’s delver high part load efficiencies but can suffer when running at full load
- This series has been specially engineered with sound sensitive environments in mind. Sound power levels for screw chillers with variable speed compressors have much less levels than the chillers with fixed speed compressors
