Best Of
Re: Air conditioning condensate
Really need to know:
SA, DB & WB (or humidity)
RA, DB & WB (or humidity)
But your answer might (should) be in pints (pounds)
Re: DMConsult for Preferred Sales, Inc, (PSI)
Thanks, Dave. Our site has been around since 1997 and we have decades worth of educational content and discussions. Most people find us through Google.
Re: New Propane Boiler Options
Thank you for the article you posted, @Kaos , these are all good things to explore. The example in that article presents a scenario requiring room air dehumidification when it was 90°F outside; this is much different scenario than operating a heat pump water heater in cold climates when outside air is cold and dry.
The ASHRAE article I referenced indicates that heating discharge air from a heat pump water heater is a possible solution as the air impacting a surface can cool it down below the dew point. This is not easy without an external source of heat. Although the discharge is localized, it is informative to see the following analysis on the impact of a heat pump water heater on a room the size of an entire home:
"The best-case scenario for installation in an enclosed space would be a closet the size of an entire house. …The HPWH would be able to extract about 6.2 kBTU of heat from the air (5.3 kBTU sensible + 0.9 kBTU latent). This is not enough heat for a single heating cycle in a typical 3 to 4-person household of this size. Furthermore, cooling indoor surfaces down near 45ºF for more than an hour, multiple times a day, carries a high risk of moisture damage and mold in most climate zones. If the air mass in a 1,625 ft² room does not contain enough energy to heat the water, neither will the air in a smaller room."
Roger
Roger
Re: Hartford Loop design origin
In my house she was called the dishwasher, laundry wench, and cook. (only in my mind LOL) Otherwise called the BOSS!
But by todays standards the Stationary Engineer took over the job of Fireman when the boilers were converted to automatic heating like oil burners or gas burners.
Re: Indirect water heater operation sequence
Once the 160 degree boiler water starts adding heat to the indirect it will fall rapidly in temp, there isn't a whole lot of heat stored in the couple gallons of water stored in the boiler. If the aquastat had multiple setpoints and had a setpoint of say 155 for the indirect call, the boiler temp would drop and it would fire pretty soon after the start of the indirect call anyhow. Since you need the return water temp to get up to 140 pretty quickly after a start of a call for the indirect to prevent condensing of products of combustion in your cast iron boiler there isn't going to be a lot you can do with reducing the setpoint for the DHW call. Energy Kinetics does some dynamic control of the setpoint when they are heating an indirect but it is unlikely you would ever save enough to cover the cost of changing the controls.
mattmia2
Re: Trane Air Handler Fan Constantly Running
Without an EPA license your not allowed to gauge up!
pecmsg
Re: Hartford Loop design origin
A Hartford Loop is a Dam..keeps the water up high. Mad Dog
Re: Copper to Pex in hydronic heating for DIY
after you solder them and they cool down heat them back up and take them apart you will see where the solder flowed .
- clean the fittings good with sand cloth, scotchbrite and or cleaning brushes. For the fittings I buy a cleaning brush and cut the handle off. Chuck the brush in a drill. It makes very quick work of cleaning the fittings
- Controlling the heat is the key. Its better to start with to little heat you don't want to overheat the fittings.
- clean the tubing with sand cloth or scotchbrite
- apply flux to the end of the tube. just a thin film
Practice makes perfect. Most say for 1/2" tubing use 1/2" of solder, 1" tubing 1" of solder etc. a little more is ok. You want the solder to flow so pull the heat away when the solder starts to flow, you can reheat if needed.
The solder follows the heat and you want the solder to pull in so with a coupling you would aplpy the heat to the center of the coupling with an elbow you apply the heat to where the end of the tube is inside the fitting.
Doing the bottom of a fitting on a vertical pipe is a little more difficult. Kepp the heat higher on the fitting to pull the solder up. Use minimal heat. Don't heat the pipe below the fitting or the solder will fall out of the joint and flow down.
After soldering have a dry rag to wipe the excess solder off. Do this gently to not disturb the joint.
It sound more difficult than it is. With a little practice you will be fine. Water in the pipe is your enemy.
Re: DMConsult for Preferred Sales, Inc, (PSI)
I like the company name and the associated initials (PSI). No pressure here 🤣!