"Peter Parry" wrote in message
...
On Sun, 24 Aug 2003 00:33:35 +0100, "IMM" wrote:
"Peter Parry" wrote in message

With blown air systems the radiant temperature of all surfaces must
always be equal to or below the air temperature and for equivalent
levels of comfort higher, not lower, temperatures are required.

This is not accurate.

If you think it is inaccurate please explain

It is not accurate in his assumption comfort levels.

So you agree that with blown air systems the surface temperature of
interior surfaces will always be equal to or below air temperature?

That is obvious. Once warmed up, equal to.

The body is always
cooling. It is the rate of cooling that makes us feel hot or cold.
Some
surfaces in line of sight of the body extract heat from the body more
than
others. The surface type and colour also make a difference. Temperature
of
the surface is just one aspect of MRT. If you read both authors, this
is
said in a round about way.

Mean radiant temperature is simply the area weighted mean
temperature of all the objects surrounding the body. It will be
positive when surrounding objects are warmer than the average skin
temperature and negative when they are colder.

Not quite right. Some surfaces reflect radiant heat and may not be warm at
all. This is where MRT is confusing. It is merely not just surface
temperatures of objects.

snip misunderstanding of MRT and forced air.

You can't. You don't understand MRT, and few actually do. It is
regarded
as one of those things invented to explain something.

It is simply basic physics and
physiology, nothing magic or
complicated about it.

It is not totally complete and reliable.

Only in catalogue land. The great
advantage of slow reaction systems
is the controls can be really
simple _if_ the design is right in the
first place.

Nonsense!!! Do your physics make
the concrete slab heat up faster or cool
faster?

no - which is why fancy controls are not usually needed.

You haven't a clue soldier boy.

Stop prattling on about physics you fool. No designer look at his O
levels
physics book when designing a heating system.

If he doesn't understand the physics
of heat loss and gain how then
does he design it?

Oh my God. Stop reading those How Things Work books.

Because your house is occupied most of the time.

Is it?

So you said/implied.

It s been a "fad" for the last 15 years
at least. (actually the last
2000 odd to be more precise)

It is a fad. The number installed systems at the mo is in single %age
figures. When the building boom really starts it will be insignificant
in
installed systems.

Of course - because developers want
the cheapest quickest and
simplest systems they can stuff in
their little boxes. Quality is
not an issue.

If UFH sells they will put it in.

Balls!!! Dream on. You have lived in army
houses.

Most of my houses were not army houses.

And you have experienced ?

Design and installation of 1000s of them.

and never lived with the consequences
of any, like most plumbers.

Not a plumber soldier boy.

I wasn't design/installed properly.

An assortment of far better qualified
people than you

They are not better qualified or
experienced than me.

If you care to let us know your qualifications
and experience I'll compare them for you.

No thanks soldier boy. You don't know enough.

including engineers (not fitters) from
the manufacturers have said it is well
designed and installed.

Balls!! If it was designed and installed well the user would love it.

It was, he doesn't.

Balls!! It was not!!!



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