Hydrocoil sizing

mtfallsmikey

The truth Steve...It WAS more nerve-racking than my daughters being born...must be old age.

mtfallsmikey

The correct EDB

For residential purposes,what would be the correct EDB temp. to base sizing of a hydrocoil on?

tim smith

I would say probably 68

If this is on condensing boiler size the coil as large as you can. I try and size around 130 to 140 entering to stay in condensing temps. Keep a high delta t also on water side to stay in condensing also as long as you can keep your air temp up. I usually end up with more like heat pump air temps w/ this kind of sizing to stay in condensing but works well.

Brad White_194

I agree

for heating, your room setpoint if we are talking heating and no entering ventilation air.

Get all of your variables, BTU load, airflow CFM, water temp. in, water temp out, flow, entering air and leaving air. Technically you can heat a room with 80 degree air if the distribution is nearly perfect and there is enough airflow, but I typically strive for about 110 degrees to avoid wind-chill effect if it is dry.

With low water temperatures you may see a 3-row or 4-row coil. Manage the flow well and watch condensing happen.

DanHolohan

What is

EDB?

don_185

I think

i think he meant entering drybuld temps.Should be EDT.

DanHolohan

Thanks!

If I don't ask, I don't know.

mtfallsmikey

To clarify:

EDB / EDT, also LDB /LDT, are interchangeable, as well as wet bulb acronyms. Depends on how they are listed on a mfr's spec. sheet. The unfortunate thing that I have found out during this particular science project is the lack of good air static pressure drop data for these coils, especially if you want to mount one of these in an existing forced air system in conjunction with an A.C. or heat pump coil...another question is can hydrocoils be mated to high-velocity A.C, systems? (good question for Mr. White!). While at the 'ole wholesale house yesterday, I wanted to price a couple of Taco circs, counter man was puzzled by IFC...sez he never heard of them!!....Arrrgh!

mtfallsmikey

And..forgot to mention

This will be hooked up to a wood-fired boiler. Not thinking real clearly this morning; my youngest daughter will be entering the hospital later this morning to have her son, my first grandchild...I'm kinda nervous!

Mark_46

Wow

Tim,

May I ask - when you size for 130-140 entering water temp, is that at outdoor design temp?

I have four row coils and have set my curve so that at average winter temp in my area (35 degrees) the return water temp is not higher than 128; roughly speaking where condensation starts/stops. That translates to a boiler setpoint in the low 140's.

Jed_2

hydrocoils

Of course they can! Just use the coils Spacepak or Unico or any other HV system offers; they're designed for the SP & Velocity.

Steve Ebels_3

Mikey

If it's any consolation, I was way more nervous about my babies having babies than when we had the babies in the first place. All has turned out well and Grandkid #10 is in the oven as we speak. There is truly nothing like 'em.