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I talked with my GC, and he couldn't figure out why the sewer ejector pump would be responsible for emitting CO2 in high levels, especially if we didn't smell sewer gas, which would indicate a leak in the pipes. I decided to get some more data on the CO2 levels in the Mechanical room, and specifically above the the sewer ejector pump cover.
It’s long been known that, at very high concentrations, CO2 is an asphyxiant. Levels exceeding 40,000 ppm are an immediate life hazard; OSHA sets the 8-hour permissible exposure at 5000 ppm. In the last 15 years, studies have suggested that the CO2 levels routinely encountered in homes may themselves impact human health and performance.
My house has high levels of CO2 / carbon dioxide, every room is between 1100 ppm to 1200 ppm according to an air quality test I had. There are only 2 grown occupants and it's a 1000 sq. ft. brick house. No pets or plants, gas stove / furnace / water heater. The basement was the only area that had between 900-1,000 ppm of CO2. I've read ASHRAE likes to see under 1000 ppm of CO2. We do have ...
Yes, CO2 is below R410A & R22 systems for low temp systems, but for higher temp operation where those HFC system efficiencies fall off CO2 has a very distinct edge. One of the issues for designing efficient heat delivery systems with CO2 is the requirement for delta-Ts greater than 25C on the refrigerant loop, a constraint not shared by fully ...
Thank you for this equation! I used it to estimate our ventilation based on measured CO2 levels and number of people for our bedroom (well, counting one large dog as a person), with and without the bathroom exhaust fan turned on. The numbers seem very reasonable. The equation nicely explains why turning on the exhaust fan drops CO2 levels in half.
That’s because a CO2 reading tells you only one thing: the concentration of CO2 in the air being sampled by the monitor. But it hints at something else, and that’s where its usefulness lies. With a high CO2 reading, the indoor air quality actually could still be pretty good. Why? Because good indoor quality results from a layered approach ...
Since high CO2 levels are associated with low ventilation rates, a high CO2 level is a warning sign that something may be wrong with indoor air quality. People spend a lot of time in bed. Ideally, a ventilation system will provide fresh air to every room in a house. That said, some rooms are more important than others.
CO2 as a refrigerant in this application is brilliant, and I'd love to see either a more typical indoor-only packaged unit using CO2, or better yet a split system using CO2 (of course the high pressures involved make servicing / installing CO2 split systems tricky, but I think it's starting to gain some traction in large commercial applications ...
One was as high as 3,600 hours per year, implying that the system runs an average of 10 hours per day, 365 days per year. So I checked with someone who knows and found out that the national average is probably around 1,500 hours per year, and it’s more like 2,000 hours per year in a hot climate where the air conditioner runs a lot.
A major challenge with using CO2 as a refrigerant for heat pumps is that they work above CO2’s critical point at ~88F. For a HP, COP equals the heat transferred out of the high-side heat exchanger divided by the electric input into to the compressor.