Indeed. lets look at how long its taken bill gates to write a program
that isnt full of bugs and doesnt crash.
Ok now suppose we have a rock solid, building-code-approved load
calculation program. 10 different people, inputting data
independently, will arrive at 10 different 'answers'. Which one is
OK now we have the exact btu gain/loss numbers, and now we must
select pieces of equipment that most closely matches the heat
gain/loss numbers, and still stay within the customers budget.....
Guess what?? NOBODY makes a 29,000 btu gas furnace with a 57,295
btu, 5 ton blower, which is exactly what the load calc says is
needed..........so now what? Oversize the heating to obtain the
desired cooling airflow??
A tiny fact that most consumers are never made aware of is that a
heating or cooling load calc is accurate at only one point in time,
and that is when indoor and outdoor ambient temps are at DESIGN
conditions. Any other time its either oversized or undersized.
Oversizing will cause the system to short cycle therefore the humidity
will not be reduced enough, unless you cool to a very low temperature
and it will then feel cold and clammy. Washington DC, Wash. Natl. AP,
Winter Design 99% at 14-F; 97.7% at 17-F. Summer Design, at Wash. Natl.
AP is 91-F Dry Bulb, 74-F Wet Bulb, or around 44% relative humidity.
With that humidity level, a 13 or 14-SEER with a Scroll compressor and a
TXV refrigerant control should work okay with a fairly high airflow.
Right-on - gofish.
In your cited case; I would go with a separate air handler for the long
season for cooling. Heating would probably be a short season, therefore
you might be able to go to electrical baseboard heat or some other option.
Do everything possible to bring that heatload down as low as possible,
then size the equipment accordingly.
That one time investment will save initial costs and utility costs over
the life of the equipment.
- udarrell - Darrell
Air Conditioning\'s Affordable Path to the "Human Comfort Zone Goal"
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