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Type: Posts; User: sskzekeman

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1. Thread: Rate of heat rise calc....

by sskzekeman
Replies
22
Views
1,274

I have a hot water baseboard heating system and ...

I have a hot water baseboard heating system and the off/on duty cycle equation I suggested for a furnace is invalid for me since my convective capability is far less than the hot water heater...
2. Thread: Rate of heat rise calc....

by sskzekeman
Replies
22
Views
1,274

That's how you make a first test. If you divide...

That's how you make a first test. If you divide apples by apples, anyone knows you can't get oranges, or for that matter, apples.
As for significant figures, try your own tax return;if you get...
3. Thread: Rate of heat rise calc....

by sskzekeman
Replies
22
Views
1,274

Well I have a more simplified way of doing this:...

Well I have a more simplified way of doing this:
But first the formula I suggested,
RATE OF RISE=RATE OF FALL*[T0/(70-T0)]
has an implicit assumption that the outside design temp, Td is 0 and that...
4. Thread: Rate of heat rise calc....

by sskzekeman
Replies
22
Views
1,274

I respectfully disagree with that formula. First...

I respectfully disagree with that formula. First off it is dimensionally incorrect, i.e. dividing BTU/hr by BTU/HR cannot yield hours.
Also, you must know the rate at which it falls without heating ...
5. Thread: HVAC-Calc Calculated Heat Loss vs. Actual

by sskzekeman
Replies
14
Views
947

You definitely have a thermostat problem if it...

You definitely have a thermostat problem if it takes 9 minutes to restart your furnace, especially since your house is so tight.And if your furnace data is accurate, I would take your test data over...
6. Thread: How far north are heat pumps effective?

by sskzekeman
Replies
48
Views
8,057

I also live in southern CT and at my rate of...

I also live in southern CT and at my rate of \$.25/KWH, and assuming a COP of 3, I doubt that a heat pump is a good idea-- unless NG exceeds \$23/million btu.

So what am I missing?
7. Thread: Constant blower control to equalize temp?

by sskzekeman
Replies
3
Views
528

If you run the fan constantly in the "on" mode...

If you run the fan constantly in the "on" mode rather than "auto" you would better equalize the temperatures or consider increasing the insulation to the lower room or if possible rebalance the flow...
8. Thread: What to do this fall?

by sskzekeman
Replies
8
Views
634

I would either put in more attic floor insulation...

I would either put in more attic floor insulation or put in a temperature controlled attic fan and set the temperature to, say 80-85 in the attic or whatever temperature you would need to heat the...

by sskzekeman
Replies
8
Views
749

You have an open circuit of the white common "c"...

You have an open circuit of the white common "c" wire" and tying the c to red was wrong and unnecessary since c was dead at the coil anyway. You had continuity of the ground (green) which was tied...
10. Thread: AC Motor Overheating Question

by sskzekeman
Replies
21
Views
1,768

What I am saying is that most fan curves I have...

What I am saying is that most fan curves I have seen show a DECREASE in power at the same RPM when there is increased blockage of the ducting ,including increased resistance due to a dirty filter....
11. Thread: AC Motor Overheating Question

by sskzekeman
Replies
21
Views
1,768

Regardless of the A/C usage the blower should be...

Regardless of the A/C usage the blower should be rated for continuous service and the Tech is absolutely wrong in his explanation, The filters have nothing to do with the problem as anybody in the...

by sskzekeman
Replies
17
Views
1,305

Power factor is, FYI, the cosine of the...

Power factor is, FYI, the cosine of the arctangent of the reactive impedance over the resistance.And the impedance Z is the vector sum of the resistance and the reactance

Moreover, contrary to...

by sskzekeman
Replies
32
Views
4,431

Hey, moron What makes you think that a panel...

Hey, moron

What makes you think that a panel that develops 120 degrees without the coating will not have signiificantly more temperature at the panel under the coating which is a major thermal ...

by sskzekeman
Replies
17
Views
1,305

The "savings" to you would be infinitesimal; it...

The "savings" to you would be infinitesimal; it only the reduces heating loss in the house wires leading to the unit, called the "I squared R " loss. So your benefit would be almost zero since the...
15. Thread: How to best measure cycle frequency / run time

by sskzekeman
Replies
15
Views
1,105

Last time I checked my ambient was 75 degrees.

Last time I checked my ambient was 75 degrees.

by sskzekeman
Replies
14
Views
1,431

Get the subcooling and delta T across the...

Get the subcooling and delta T across the condenser. Also EER rating would help.
Overcharge causing excess subcooling or inadequate condenser airflow could be some of the causes.
17. Thread: How to best measure cycle frequency / run time

by sskzekeman
Replies
15
Views
1,105

I never did this but he cheapest way to do it IMO...

I never did this but he cheapest way to do it IMO is to somehow hook up a 110 VAC electric clock to the furnace blower AC line ( must be 110 VAC) , but don't do it yourself. Get a sparky friend to...
18. Thread: rate of temperature decrease

by sskzekeman
Replies
1
Views
424

The transient is irrelevant to performance, Just...

The transient is irrelevant to performance,
Just make sure the house can reach and sustain the setpoint temperature on the hottest and most humid oudoor conditions.
What you are asking is for...
19. Thread: No AC - 105 degrees today in N. Texas

by sskzekeman
Replies
11
Views
877

Nobody asked me but.... Is it a good idea to run...

Nobody asked me but.... Is it a good idea to run an A/C unit when you're away for an extended period of time without having somebody checking it almost daily?
I don't think so.

by sskzekeman
Replies
17
Views
1,025

Wow, What overkill for a simple problem unless...

Wow, What overkill for a simple problem unless you cant dump it outside.

by sskzekeman
Replies
17
Views
1,025

Oh, I didn't notice. But with flow of condensate...

Oh, I didn't notice.
But with flow of condensate in winter no way could it freeze up anyway since it takes a lot of time to lose enough heat for freezing.

by sskzekeman
Replies
17
Views
1,025

Why don't you leave it alone and don't worry...

Why don't you leave it alone and don't worry about freezing a condensate line you describe. So what if some residual water freezes in the winter; it shouldn't cause any problem unless you have some...

by sskzekeman
Replies
33
Views
9,534

My bad, Upon looking into this more, it is...

Upon looking into this more, it is clear, as you say, that the enthalpy is practically independent of DB and virtually depends on WB alone.
That, however doesn't say that the same input...

by sskzekeman
Replies
33
Views
9,534

Well since my charts show at 64 WB and outdoor...

Well since my charts show at 64 WB and outdoor ambient = 85 deg a range of 8 to 14 degrees SH for indoor DB range from 70 to 90 deg DB, The enthalpy of the 90 deg air and the 70 deg air differ...

by sskzekeman
Replies
33
Views
9,534

Checking my tables, I find that the formula is ...

Checking my tables, I find that the formula is OK for WB temps >64 deg, indoor DB around 80 and ambient temps > 80 which makes it a rule of thumb formula.
Since it doesn't take account of indoor...
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