La contaminación del aire interior es un problema importante para la salud y el bienestar de las personas. Los recuperadores entálpicos pueden ayudar a garantizar un aire interior de calidad al transferir calor y humedad entre el aire de entrada y salida, minimizando así el volumen de aire que necesita ser movido y reduciendo los costes energéticos de la ventilación. Estos sistemas ofrecen una solución óptima al combinar la filtración, el control de la humedad y la ventilación de manera eficiente.
Who’s Problem Is It ? In one form or another we are all adversely effected by poor Indoor Air Quality.
What’s Being Done ?
Cleaning the air in the enclosed space by employing filtration methods and materials can be used to improve indoor air quality and reduce the requirements for outdoor air. ASHRAE Standard 62 Indoor Air Quality Procedure provides a procedure for reduced levels of required outdoor air by cleaning and recirculation part of the indoor air. This can reduce required fresh air. High efficiency filters, carbon filter media and gaseous contaminant removal systems can be used to clean the air. The cleaned air stream flow is measured and the dilution ratio with outside air verified. The recirculated air is then used for part of the outside air requirements. Compliance with the standard requires design verification and documentation. This solution is complex due to the design verification requirements and the required air cleaning equipment. Gases can be difficult and expensive to remove. Maintenance is expensive and mandatory to maintain compliance. The largest unknown is present day contaminants which are declared hazards in the future. Future modifications may be required, or liability for the past effects of the reduced fresh air rates might result from the installation.
Dilution is the process of adding fresh outside air and reducing the concentration of the pollutants. It is the basis for ASHRAE Standard 62 level of 15 CFM per person outside air. At the normal body CO2 production rates 15 CFM per person will maintain the CO2 level below 1000 ppm. (Assuming a normal outside air CO2 level of 300 ppm) Ventilation with outside air reduces the concentration of all pollutants. Unknown hazardous materials or gases impossible to remove from the air stream will all be diluted together by the fresh air. Ventilation with outside air is relatively easy to implement or enhance. Dilution is a good position for the future. It is the method on which the standards are based. The future “unknown” pollutant is also being diluted. The problem with dilution and ventilation is the fresh air impact on the HVAC system. Cooling and heating loads are increased. Equipment will have to be added or modified to meet the added demand in a retrofit situation. New construction will pay an energy penalty. Lossnay™ by Mitsubishi can help solve the energy problems.