Sustainability

We Protect Our Atmosphere for Generations to Come

Petra Green Values

Engineering:

– We are an engineering company

– We provide engineering solutions to meet the requirements of the customer

– We design and build with a strong engineering discipline

Efficiency:

– We produce high efficiency units

– We can exceed efficiency requirements

Environment:

– We use environmentally friendly refrigerants

– We can build units with ultra low noise generation

– ISO 14001 Certified

– Incorporate environmentally friendly practices

Petra’s Role in Ozone Protection

Air Conditioning, Heat Pump and Refrigeration systems affect the environment and the ozone layer through the release of refrigerants into the atmosphere and also through the release of carbon dioxide when generating the power for operating the system through its life time.

To reduce the impact of HVAC Systems on the Environment; Petra has replaced ozone-depleting hydro-chlorofluorocarbons HCFCs (R-22) by chlorofluorocarbons (CFCs) (R-410A and R-407C Refrigerants, Ozone Friendly), Petra produces highly efficient products to reduce the electrical energy consumption for its units, thus helping to protect the environment.

Energy Saving Solutions

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 provides 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 is increased by using high resistive insulation material, closed-cell foam insulation, with a lower thermal conductivity with 2” – standard thickness and, -4”optional:

As the Ultimate solution for higher insulation, Petra’s new design of Thermal Break Units for AHUs, increases the thermal resistivity. There is no contact between inner and outer surfaces, reducing thermal conduction.

Variable Water Volume (VWV)

Petra’s variable water volume systems deliver superior indoor comfort, energy efficiency,design flexibility and ease of installation.

The system is integrated under a powerful control platform that manages the HVAC system and optimizes operating system efficiency.

(VWV) Technical Features:

  1. 25%less power consumption in comparison to equivalent capacity DX systems.
  2. Contributes to earning LEED points in energy and atmosphere credit according to the requirements of the performance rating method in ANSI/ASHRAE/IESNA standard 90.1 – 2010.
  3. VWV may be suitably designed to provide 100% fresh air to occupant spaces.
  4. Efficient in high rise buildings, no height limitations.
  5. Flexibility in installation with no limitation on the distance between the indoor and outdoor units.
  6. Modulating load down to 1% without any issues of oil recovery.
  7. Easy to detect and maintain leakages.
  8. Suitable for fully and partially occupied buildings.
  9. Factory mounted and factory commissioned controls that significantly reduce time required for onsite commissioning.
  10. Petra’s VWV system contributes to fulfilling the prerequisites and earning points for.

The following LEED Credits:

  • Energy and Atmosphere Prerequisite 1 (EAp1) Fundamental commissioning of the building energy systems.
  • Energy and Atmosphere Prerequisite 2 (Eap2) Minimum Energy Performances.
  • 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.

Variable Air Volume (VAV)

Petra’s VAV systems utilizing communication controllers on VAV terminals enable 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 due to the data (such as airflow، damper position، fan، and heat status) being 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 study 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.

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.

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

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

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.

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