ERV Energy Recovery Ventilation Systems Reduce Long Term Costs and Improve Indoor Air Quality

ERV Energy Recovery Ventilation Systems Reduce Long Term Costs and Improve Indoor Air Quality

Is the indoor air your breathe is as fresh and healthy as it can be?

As building science professionals have known for some time, an effective ventilation strategy is an absolute requirement for all homes. Mechanical ventilators exchange air inside the home with fresh air from the outside. This helps to reduce indoor pollution levels, and greatly increases the comfort level inside the home.

Many ventilation designs are including Energy Recovery Ventilators (ERVs) to improve the system efficiency. Besides providing controlled ventilation, ERVs are able to filter, humidify, dehumidify, heat, or cool the incoming fresh air. The most popular design of ERVs utilizes a desiccant wheel to remove both heat and a significant amount of moisture from the incoming air, which reduces the load on the air-conditioning system. But while ventilators and ERVs can add tremendously to the comfort and efficiency of a home, they must be installed correctly.

One of the more recent developments in the ‘green’ technology industry is the creation of environmentally-friendly buildings that use energy-efficient technologies to reduce power consumption.

Energy consultants point out that creating ‘green’ buildings and improving the air quality inside such facilities utilizing ERV can and do go hand-in-hand.  ERV Systems that reduce demand for energy while improving ventilation are increasingly in demand.

ERV – Energy Recovery Ventilation systems saves energy, increases indoor air quality, reduces contaminates and odors.

The use of ERV technology “energy recovery ventilation systems,” or ERVs. Such systems are designed to reduce energy consumption and improve indoor air quality (IAQ) by capturing and recycling building energy to humidify, pre-cool or dehumidify incoming air.  

ERVs, the research first said, are most popular in areas with more extreme outdoor temperatures, like Northern states where winters can get quite cold, or Southern states where very warm temperatures and high humidity demand more energy consumption to maintain comfortable indoor environments.

“The focus on IAQ is another key trend benefiting ERV, as people become increasingly conscious of the importance to maintain air quality through properly designed and managed HVAC systems,” Energy consultant said in the energy audit survey.

Market growth for ERVs, Energy consultant said, is driven largely by energy conservation policies that are challenging building custodians to reduce energy consumption for indoor climates. The firm cited as an example the 90.1 standard from American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) which currently dictates “energy recovery systems for applications of 5000 cubic feet per minute (cfm) and larger with 70 percent outside air (OA).”

ASHRAE 90.1 is a standard that specifies at least 50 percent total effectiveness for ERVs, Energy consultant said.

The Air Conditioning and Refrigeration Institute and the U.S. Environmental Protection Agency also have various standards and regulations regarding energy recovery and IAQ.

Energy Consultant said two main obstacles lie in the way of more widespread use of ERVs: lack of knowledge and the need to reduce operating costs in the short term. Since building owners and facility managers rely for the most part on contractors to select and install heating, ventilation and air-conditioning (HVAC) equipment, if the contractors are not up-to-speed on ERV developments they may pick products that aren’t as energy-efficient as they could be.

Also, Energy consultant noted, HVAC contractors work within budgets and therefore tend to buy equipment based on its price rather than long-term cost benefits. It therefore is important to educate contractors about ERVs, and some of that burden falls on manufacturers. The Green Building Council is also playing a role through its Leadership in Energy and Environmental Design program that evaluates buildings to determine the environmental performance during their entire lifecycle.

ERVs aren’t just good for the planet; they’re good for people, too.

“The focus on IAQ is another key trend benefiting ERV, as people become increasingly conscious of the importance to maintain air quality through properly designed and managed HVAC systems,” Energy consultant said in the report.

When IAQ isn’t managed properly, people living or working in unhealthy buildings can develop sick building syndrome from pollutants in the air they breathe.

“With half of all illnesses attributed to indoor airborne contaminants, the U.S. Environmental Protection Agency (EPA) has declared IAQ a public health priority,” Energy consultant said. “Ventilation with outdoor air is the only strategy that can simultaneously reduce the levels of all indoor pollutants.”

Compiled by: YJay Draiman, Energy analyst – Northridge, CA