Condensing temp of refrigerant

[anup]

In Air Source Heat Pump, where the condensing medium is water, to get hot water at 60 deg. C., what should be the condensing temp of refrigerant?

[Horatiu]

Hello Anup. If you want to get hot water at 60 deg. C the condensing temperature of refrigerant must be bigger then the temperature of water. 64-66 deg. C should do it.
Best wishes.

[botrous]

Hi Anup , in any heat exchanger , to heat a substance at least you need the tempreture of the heating substance to be the desired tempreture of the heated substance + .

Like if you want to heat water from 10*C to 20*C , at least you need a heat source of 21*C .
The capacity should also be calculated , I mean you can't heat 10 Kg of water from 10 to 20*C with 5Kg of water at 21*C .

The same principle applies to your question

[Lc_shi]

Hi anup
it will depend on your heat exchanger design. Usullay 3~5K is the lower limit. Too small temp diff will cause bigger size heat exchanger and increase cost.

rgds
LC

[anup]

Hi, How to calculate over all heat transfer co-efficient for a eveporator and how does it corelated with tube thermal conductivity ?