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EVERGREEN ​ENTERPRISES

For Greener Tomorrow

HVAC Design

We are always looking to reduce the Energy which is consumed by the HVAC systems

Retro Fit

We are here to improve your existing HVAC systems Efficiently within your Budget

Air Balancing

Balance the Conditioned air to balance your electricity bill

Smoke Testing

Leak testing of HVAC Duct lines

Our Services

HVAC (Heating, Ventilation, and Air Conditioning) systems are designed to provide thermal comfort and acceptable indoor air quality in various buildings and spaces. The design of an HVAC system involves several key components and considerations. Here are some essential elements and factors involved in HVAC design:

• Load Calculation: The first step in HVAC design is to determine the heating and cooling load requirements of the space. Load calculation takes into account factors such as the size and orientation of the building, the number of occupants, insulation levels, solar heat gain, and local climate conditions. It helps determine the capacity of the HVAC equipment needed to maintain the desired comfort levels.
  
• Equipment Selection: Based on the load calculation, appropriate heating and cooling equipment are selected. This may include Chillers, Air Conditioners (VRF/VRV/DX) and ventilation fans (Fresh air, Exhaust). The selection depends on factors like energy efficiency, capacity, environmental impact, and cost-effectiveness.
• Ductwork Design: Ductwork is responsible for distributing conditioned air throughout the building. The design of the ductwork system involves determining the size, shape, and layout of the ducts based on the airflow requirements. Proper duct sizing and layout ensure adequate air distribution, minimal pressure loss, and efficient operation of the HVAC system.
• Ventilation: Ventilation is essential for maintaining indoor air quality. The HVAC design incorporates provisions for fresh air intake and exhaust, ensuring proper ventilation rates as per industry standards and building codes. Ventilation systems may include fans, air filters, and heat recovery ventilators (HRVs) or energy recovery ventilators (ERVs) to minimize energy losses.
• Energy Efficiency: Designing energy-efficient HVAC systems is crucial for reducing energy consumption and environmental impact. This may involve selecting high-efficiency equipment, incorporating insulation, minimizing air leakage, using variable speed drives for fans and pumps, and utilizing energy recovery technologies.
• Maintenance and Serviceability: Consideration should be given to the ease of maintenance and serviceability of the HVAC system. Accessible components, well-designed filter systems, and regular maintenance schedules contribute to the longevity and optimal performance of the equipment.

HVAC system retrofitting refers to the process of upgrading or modifying an existing HVAC system to improve its performance, energy efficiency, and functionality. Retrofitting is commonly done in older buildings or structures that have outdated or inefficient HVAC systems. It allows for the incorporation of new technologies and design principles to enhance comfort, reduce energy consumption, and meet current building codes and standards. Here are some key considerations and steps involved in HVAC system retrofitting:

• Energy Audit: Before initiating a retrofit project, an energy audit is typically conducted to assess the current performance and energy efficiency of the existing HVAC system. The audit helps identify areas of improvement and potential energy-saving opportunities.
  
• System Evaluation: The evaluation involves a thorough examination of the existing HVAC system, including the equipment, ductwork, controls, and ventilation. This evaluation helps determine the feasibility of retrofit options and identifies any deficiencies or limitations that need to be addressed.
• Load Calculation and System Sizing: Similar to new HVAC system design, load calculation is performed to accurately determine the heating and cooling requirements of the building. Proper system sizing ensures that the retrofitted system is appropriately matched to the building's load, optimizing efficiency and comfort.
• Equipment Upgrades or Replacement: Retrofitting may involve upgrading or replacing components of the HVAC system, such as boilers, chillers, air conditioners, heat pumps, or ventilation fans, with more energy-efficient models. Newer equipment often incorporates advanced technologies and higher efficiency ratings, resulting in reduced energy consumption and improved performance.
• Ductwork Modification: The existing ductwork may need modification to accommodate the changes in the HVAC system. This may involve resizing or redesigning the ducts to ensure proper airflow distribution and minimize energy losses due to leaks or inadequate insulation.
• Energy Recovery Systems: Retrofitting can also involve the installation of energy recovery systems such as heat recovery ventilators (HRVs) or energy recovery ventilators (ERVs). These systems recover and reuse waste heat or coolness from the exhaust air to pre-condition the incoming fresh air, reducing energy demand.

Air balancing is an important process in HVAC systems that involves adjusting and optimizing the airflow distribution throughout a building to achieve desired comfort levels and energy efficiency. It ensures that each room or space receives the appropriate amount of conditioned air based on its heating and cooling requirements. Here's an overview of the air balancing process in HVAC systems:

• Testing and Measurement: Air balancing begins with measuring the airflow rates at various supply and return registers using specialized equipment such as an airflow hood, anemometer, or flow hood. The objective is to obtain accurate data on the airflows to assess the system's performance.
  
• System Analysis: The data collected during testing is analyzed to evaluate the overall performance of the HVAC system. This analysis involves comparing the measured airflow rates against the design specifications or recommended airflow rates for each space.
• Adjusting Dampers and Registers: To balance the airflow, dampers and registers throughout the HVAC system may need to be adjusted. Dampers are used to regulate the volume of air flowing through ductwork, while registers control the airflow into individual spaces. By adjusting these components, the airflow can be redirected or modified to achieve a more balanced distribution.
• Supply and Return Air Balancing: Balancing the supply air involves adjusting the dampers and registers on the supply side of the system to ensure that each space receives the appropriate amount of conditioned air. Return air balancing involves adjusting the return air grilles or registers to achieve proper air extraction from each space.
• Re-Testing and Validation: Once the adjustments have been made, the system is retested to measure and validate the airflow rates and pressure differentials. This step ensures that the desired air balancing has been achieved and that the system is operating as intended.

HVAC Systems Air Balancing

Smoke testing in HVAC systems refers to a diagnostic technique used to identify air leaks and airflow issues within the ductwork. It involves introducing smoke or a simulated smoke substance into the HVAC system to visualize the movement of air and detect any leaks or irregularities. Here's an overview of the smoke testing process in HVAC systems:

• Preparation: Before conducting the smoke test, it's important to ensure the HVAC system is turned off, and all fans and equipment are shut down. Additionally, all supply and return air grilles should be closed to prevent smoke from escaping through them.
  
• System Analysis: The data collected during testing is analyzed to evaluate the overall performance of the HVAC system. This analysis involves comparing the measured airflow rates against the design specifications or recommended airflow rates for each space.
• Adjusting Dampers and Registers: To balance the airflow, dampers and registers throughout the HVAC system may need to be adjusted. Dampers are used to regulate the volume of air flowing through ductwork, while registers control the airflow into individual spaces. By adjusting these components, the airflow can be redirected or modified to achieve a more balanced distribution.
• Supply and Return Air Balancing: Balancing the supply air involves adjusting the dampers and registers on the supply side of the system to ensure that each space receives the appropriate amount of conditioned air. Return air balancing involves adjusting the return air grilles or registers to achieve proper air extraction from each space.
• Re-Testing and Validation: Once the adjustments have been made, the system is retested to measure and validate the airflow rates and pressure differentials. This step ensures that the desired air balancing has been achieved and that the system is operating as intended.

Smoke testing in HVAC systems