Untitled Document
  Highly-Insulated Air Handling Units
  Variable Air Volume (VAV)
  Energy Recovery System
  Energy recovery wheels  
  Cross flow heat exchanger
  Heat pipe coils
Energy efficiency requirements are becoming more rigorous with the growing concerns for environmental and economic sustainability. Around 70 percent of energy usage and 63 percent of greenhouse gas emissions are estimated to be contributable to heating, cooling and ventilation. HVAC typically accounts for 40-50 percent of the total energy bill for businesses and commercial buildings. Properly selected energy efficient HVAC equipment can significantly reduce energy costs and meet environmental standards.

Petra engineering industries provide a wide range of solutions that incorporate the latest technologies that facilitate energy saving requirements and enhance indoor air quality and occupant comfort requirements.
Highly-Insulated Air Handling Units:
Petra’s AHUs thermal resistance increased by using high resistive insulation material, closed-cell foam insulation, with a lower thermal conductivity and 2” – standard thickness, 4”-optional:
Petra’s AHU reduces energy losses by 15% compared to others
Another solution for higher insulation, Petra’s new design of Thermal Break Panels for the AHUs, this option increases the thermal resistivity. There is no contact between inner and outer surfaces, reducing the thermal conduction.
Variable Air Volume (VAV):
Petra’s VAV system utilizing communication controller on VAV terminals enables digital communication between the unit controller and the central building automation system. The result is a system that can be monitored from a central point, offers control flexibility, and enables system-optimized control strategies. Buildings can be controlled more intelligently because the data (such as airflow, damper position, fan, and heat status) is available to perform complex system-control strategies and diagnostics from a central monitoring station.

Energy saving is accomplished through air volume reduction and reduced fan energy consumption at part load conditions. In addition, VAV systems provide multi zone independently controlled spaces (independent thermostats) that accommodate varying levels of comfort. Exceptional SEER has been demonstrated through Petra’s VAV rooftop package with air side economizer installed on numerous projects worldwide. The reduced annual power consumption of Petra’s VAV rooftop package from a case study1 conducted for a 500,000 ft2 retail shopping mall indicates a SEER of 15.4:
Petra’s VAV rooftop package unit with economizer contribution to LEED. Assists in fulfilling the prerequisites and earning points for the following Credits:

- Energy and Atmosphere Prerequisite 1 (EAp1) Fundamental commissioning of the building energy system
- Energy and Atmosphere Prerequisite 2 (Eap2) Minimum Energy Performance
- Energy and Atmosphere Prerequisite 3 (Eap3) Fundamental Refrigerant Management
- Energy and Atmosphere Credit 1(EAc1) Optimize energy Cost
- Energy and Atmosphere Credit 4(EAc4) Enhance Refrigerant Management
- Indoor Environmental Quality Prerequisite 1 (IEQp1) minimum IAQ performance
- Indoor Environmental Quality Credit 1 (IEQc1) Outdoor air delivery monitoring
- Indoor Environmental Quality Credit 2 (IEQc2) Increased Ventilation
- Indoor Environmental Quality Credit 6.2 (IEQc6.2) Controllability of Systems: Thermal Comfort
Energy Recovery System:
1 Air-to-Air Energy Recovery is the process of recovering energy or/and moisture from an air stream at a high temperature or humidity to an air stream at a low temperature or humidity.
2 This process is important in maintaining acceptable indoor air quality (IAQ) while maintaining low energy costs and reducing overall energy consumption.
3 Energy can be recovered either in its sensible (temperature only) or latent (moisture) form, or combination of both from multiple sources.
4 Units used for sensible energy recovery are called sensible heat exchange devices or heat recovery ventilators (HRVs).
5 Devices that transfer both heat and moisture are known as energy or enthalpy devices or energy recovery ventilators (ERVs).
6 HRVs and ERVs are available for commercial and industrial applications as well as for residential and small-scale commercial uses.
A. Energy recovery wheels:
This device proposes a rotating surface composed of small aluminum cells, which transfer sensible energy (hot or cold air). When desiccant is added to the aluminum cells, the heat wheel transfers both sensible and latent energy (moisture) from one air stream to the other.
Petra energy wheels normally recover 70-75% both sensible and latent energy
B. Cross flow heat exchanger:
This type of heat recovery relies on the thermal conduction for energy recovery. It consists of alternate aluminum layers of plates separated and sealed and this type is limited to sensible energy recovery. When the plate exchanger is composed of layers of polymeric membrane sheets, the plates allow also moisture to be transferred from one air stream to the other.
C. Heat pipe coils:
This type of energy recovery utilizes two coils filled with refrigerant. The energy transferred from supply/exhaust air by changing the phases (liquid/vapor) of the refrigerant inside the tube without pumping force.
This entire process of pre-cool and reheat is accomplished with no additional energy use. The result is an air conditioning system with the ability to remove 50 to 100% more moisture than regular systems.
Petra Engineering Industries Co. is a market leader as a designer and manufacturer of sophisticated, high quality commercial and industrial HVAC equipment.
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