Thanks for the info.

Sorry it took me so long to get abck to you. I've been so busy.

Thanks again!

Tifford

Tifford wants to select a corn stove that

(a) has a set point control

(b) has turndown ratio for night and day

(c) makes flyash rather than a solid ash cake

ALL ARE BIG MISTAKES!

The advantages of a corn stove include

(a) Affordably eliminates temperature and RH swings which are inherent of conventional HVAC with set point controls

(b) Provides affordable steady heat and RH at all times without excessive waste of energy to run non-functional or partially functional humidifiers and dehumidifiers

(c) Eliminates flyash, smoke, dust, germs, excess moisture, skin problems from RH or vapor pressure swings.

Low cost corn stove heat can be most easily by addressed by discussing the terms associated with HVAC heating and cooling. Temperature, humidity, and R value may sound like common terms. How about web bulb temperature (wbt), dry bulb temperature (dbt), relative humidity (RH), dew point temperature(dpt), Wall Insulation "R" value as a function of RH?

Reference www.msnusers.com/cornstoves

www.msnusers.com/tennesseecornstoves,

www.groups.yahoo.com/group/cornplace

www.groups.yahoo.com/group/cornstoves

1. Humidity is the measure of the amount of water vapor in air or

other gas.

2. Total Air Pressure - The total pressure, ambient pressure,

baromtetric pressure or atmospheric pressure of air or a specified

gas is the sum total of each of the partial pressures of all the

gasses in the mixture added together. To calculate barometric

pressure (total ambient air pressure = 14.696 psia) Add the partial

pressure of 12% oxygen plus the partial pressure of 78% nitrogen

plus the partial pressure of the water vapor due to relative

humidity plus the partial pressure due to trace gasses in air. The

barometric pressure decreases with altitude to zero as there are no

gasses present in the vacuum of outer space.

3. Partial Pressure of water vapor (Pw) is the pressure exerted by

water vapor in the air(gas). The portion of the total air (or gas)

pressure exerted by any one gas is called the partial pressure of

the subject gas. The water vapor component in air (a gas) is the

partial pressure of water. Partial pressure is expressed in units of

pressure such as mbar, Pascal, mmHg, in.Hg (Dalton's Law of Partial

Pressures)

4. Saturation Vapor Pressure (Pws) is the maximum pressure of water

vapor that can exist at a given temperature as expressed in units of

pressure. Saturation vapor pressure occurs at 100% RH. Add more

water vapor and it rains or condenses. Drop the temperature and

likewise it rains or water condenses as on a window pane that is

colder than the dew point.

5. Relative Humidity (RH) is the ratio of the actual partial

pressure of water vapor to the saturation vapor pressure at the gas

temperature, expressed as a percentage (%). RH can not exceed 100%

because the water vapor condenses to liquid water or rain.

6. Dewpoint (Td) is the temperature at which condensation (dew)

begins to form as the air (a gas) is cooled. Td is the temperature

(C or F) at which the gas is saturated Pw=Pws, The dry bulb

temperature and wet bulb temperature are equal at 100% RH.

7. Mixing Ratio or Humidity Ratio (x) is the ratio of the water

vapor mass per unit mass of dry air. Although dimensionless humidity

ratio is often expressed as grams per kilogram (g/kg) or grains per

pound (gr/lb)

8. Enthalpy (h) is the measure of the total energy in a humid gas.

The total energy is the sum of the sensible and latent heat or the

sum total heat energy of the dry oxygen & nitrogen(gas) plus water

vapor plus other impurities. Enthalpy is energy per unit by weight,

kilojoules per kilogram (kj/kg), British Thermal Units per pound

(BTU/lb). Wet air hold more energy than dry air. Humid air cost

more to heat that dry air. Leakage of heated wet air of high RH to

the outside is more costly than leakage of dry air to the outside

because the wet air holds more energy than dry air. It cost less to

heat dry air to a higher more comfortable temperature than to boil

or evaporate hot water to make one feel warmer at a lower

temperature.

9. Wetbulb Temperature (Tw) is the temperature indicated by a sling

psychrometer as sheathed in wet wicking. Wet bulb temperature is

compared to dry bulb temperature as measured by a conventional dry

or fixed mercury wall thermometer with no breeze or air velocity

influence. Wet bulb temperature measurement is influenced by the

rate of evaporation of moisture from the wet bulb wicking of the

thermometer. Air RH (Relative Humidity) determines the fixed

relationship between wet bulb temperature and dry bulb temperature.

It takes the same amount of heat but is more healthy and sensibly

more comfortable to heat a room to 76 deg F and 50% RH than to drop

the room temperature to 65 deg F at 70% RH. Conventional HVAC

heaters with temp control point set at 65F may swing down to 60F

automatically driving RH to 70% which is an uncomfortable

temperature to the sensible human. Some molds, germs and viruses

thrive and readily multiply at 70% RH. A stable corn stove heater

cost the same amount of heat to raise the same dry air to 76 deg F

which will automatically drop the RH to 50% which is well within the

sensible safe and healthy comfort zone.

10. Sensible Temperature is the sensible reaction of the human body

to detect a level of comfort or discomfort as related to room

temperature and relative humidity. The sensible comfort zone is

defined to be between 30% RH and 60% RH at temperatures between 68

deg F and 76 deg F. Human body discomfort increases as temperature

and relative humidity progress beyond the defined comfort zones. In

general, the healthy atmosphere likewise is considered to be inside

the comfort zone. High RH or low RH, for example, provide ideal

breeding conditions for bacteria, molds, germs, viruses and

increased agitation for sensitivity to human allergies.

11. Corn Stoves - RH of 50% is healthy at the temperature of

comfort. The extreme high temperature of the corn stove improves the

possibility of neutering or killing most germs in the air prior to

heat distribution into the room. The damp coils of the conventional

HVAC swinging the temp and RH through the dew point provide ideal

damp breeding conditions. The HVAC blower actuates and distributes

the germs & molds throughout the house through the air registers.

The stable temperature of the corn stove allows one to control the

room temperature and room relative humidity well within the safe and

healthy comfort zone.

12. Room Temperature - Increased RH increases the sensible

temperature of the human body and makes the body feel warmer at a

given dry bulb temperature primarily because water vapor (high room

RH) conducts energy better than dry air (low RH). It should be

noted that it cost less to heat dry air than wet air. With the corn

stove it cost less to raise the dry bulb room temperature of the

room than the cost of heat to boil water to make one feel warmer

than they really are (low dry bulb temp).

13. HVAC Set Point - Conventional HVAC systems have a temperature

control set point about which the room temperature swings. As shown

above, the relative humidity technically can not be prevented from

swinging as the room temperature swings about the control set point.

Humidifiers and dehumidifiers are technically incapable of adding

and subtracting enough moisture to maintain fixed RH as the room

temperature swings about the control set point. The corn stove

allows one to control both the relative humidity and the room

temperature because both RH and room temperature are fixed and

stable.

RH is impossible to control with HVAC and therefore, just jest RH away. Pull out the psychometric chart and call in the psychologist because RH control is not a technical option.

Wood stoves jerk RH more than a conventional HVAC. RH swings are minimized but not eliminated by selecting the expensive HVAC with a highly accurate temperature set point control featiromg small deadband and accurate repeatability. Occupants resort to continuously readjusting the air register setting in each room coupled with constantly resetting the temp set point. Only a man with tough skin or insensitive feelings would make jest about RH & room temperature control with a thermostat located in the hall or in a lock box where no occupants resides. Why the lockbox?

Wood stoves get hot when fired up and really cool during the night. There is no RH control with a wood stove or conventional HVAC.

RH control is technically impossible if the temperature is quickly and constantly changing in large increments. Some occupants run humidifiers and dehumidifiers simultaneously in the same room with mixed results. The UV light is added to the HVAC duct to kill and neuter germs, molds, viruses because the condensing moisture atmosphere provides ideal breeding grounds spreading profusely when the HVAC actuates. Air filters mechanically or ionically remove particulates with positive and/or negative charges. 0.025 or less micron filters are so sized to collect large germs in a common areas. Round up the cattle before herding them out to sale.

The only viable technical method of controlling RH is to precisely control temperature. To some occupants the RH is important. To non-occupants RH may be just jest.

The low cost heat is corn heat.

Not everyone understands electricity. We all see, hear, and feel the influence of electricity. In all humility, please don't touch the subject or you will smell like a dead rat.

Cool, damp basements in Tennessee are rather humid both summer and winter. Moisture is trapped inside the wall insulation by the vapor proof barrier if properly installed near the living space. Moisture can hardly penetrate the vapor barrier to escape to the inside. Moisture must escape to the outside. During cold rainy weather outside only steady heat from the inside will overcome the water vapor pressure of 100% RH on the outside. If the HVAC system swings temperature, the moisture will be sucked back inside the wall every time the temperature swings. By experience and data collected with corn stoves, it takes two weeks of steady temperature to reclaim the R value of insulation inside the walls and reduce the tennessee typical 73% RH inside the wall to normal values.