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00:07:55
00:10:31
00:07:55
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Transcription: [00:07:55]
{SPEAKER name="Speaker 2"}
One of the limitations of the heat pump is that you're limited as to the source of that heat. And, uh, it's becoming increasingly apparent that the, uh, only place that heat pump is going to be very important is where you have a plentiful, cheap source of water, or, relatively warm air such as around the Gulf Coast, or in the subtropical regions of the coun- uh, the world.

[00:08:21]
{SPEAKER name="Speaker 1"}
And also you'd want to have a rather low cost of electricity, presumably, because it does cost money to run the pumps, uh, electric-

[00:08:30]
{SPEAKER name="Speaker 2"}
That's certainly right, it has to compete with fuel oil and coal for heating.

[00:08:35]
{SPEAKER name="Speaker 1"}
Have you gotten any complaints, Mr. Grant, from people that live next to air conditioning who, perhaps uh, people nearby will charge if the weather is being influenced, their immediate weather by the fact that you have to put more heat into the outside air? [laughter]

[00:08:52]
{SPEAKER name="Speaker 1"}
We've had a lot of, uh, complaints, you see, on rain-making and, uh, that sort of thing, I wondered if the air conditioners have gotten into that trouble.

[00:09:01]
{SPEAKER name="Speaker 2"}
We haven't gotten that complain yet. Uh, it is true that plenty pump heat out of the building, you pump it into the outside air through a cooling tower.

[00:09:10]
{SPEAKER name="Speaker 2"}
But the amount that you warm the outside space- the streets, around about, is rather small. Most of it is put in the form of, uh, wa- water which has been evaporated.

[00:09:22]
{SPEAKER name="Speaker 1"}
What do you think is the ideal temperature for an air conditioned area, um, the ideal, uh, humidity, Mr. Grant?

[00:09:31]
{SPEAKER name="Speaker 2"}
Well, a lot of people think in terms of eighty degrees in the summer but actually that's not a physiologically comfortable condition at all.

[00:09:36]
{SPEAKER name="Speaker 2"}
Uh, a person is actually comfortable between seventy-four and seventy-five degrees and, uh, around forty to fifty percent humidity.

[00:09:45]
{SPEAKER name="Speaker 2"}
And I think in the future you will find more and more places being air conditioned at those temperatures rather than the so-called commercial standard of only eighty degrees.

[00:09:54]
{SPEAKER name="Speaker 1"}
Well, does it also depend a little bit upon the, uh, the outside temperature? I mean would you- do you vary the, uh, air conditioning temperature by what the temperature is outside or do you let it, uh, run along at this ideal temperature that you mentioned?

[00:10:10]
{SPEAKER name="Speaker 2"}
For a person who is darting in and out from the indoors to the outdoors, they are very conscious of what it is outside; the temperature should not be too low.

[00:10:20]
{SPEAKER name="Speaker 2"}
But, for you and me who are working in an office all day, uh, when we have been inside about three-quarters of an hour we lose all concept of what is going out- on out of doors.
[00:10:32]