Air to water split heat pump design

[ginger jiang]

Hi, we want to design a new Air to water split heat pump, we have three questions:

1.The compressor should be located in the outside unit or inside unit? Which one is better?

2.Can we place the buffer tank in the inside unit?

3.we want to design a double jacketed hot water tank , which means that it consists of two separate tanks. The hot water is heated in the inner jacket.The inside tank is 200L,the outside tank is 300L, is it ok?

[nike123]

Hi, we want to design a new Air to water split heat pump, we have three questions:

1.The compressor should be located in the outside unit or inside unit? Which one is better?

Outside. Reasoning:
Noise is generated outside
Smaller dimensions of indoor unit
Possibility to install more then one indoor unit

2.Can we place the buffer tank in the inside unit?

Yes you can, but that increase dimensions of indoor unit.

3.we want to design a double jacketed hot water tank , which means that it consists of two separate tanks. The hot water is heated in the inner jacket.The inside tank is 200L,the outside tank is 300L, is it ok?

Why you dont use simple water tank with conventional spiral tube heat exchanger?

[ginger jiang]

we want "tank in tank "because we think it's more efficient---the heating area is bigger than spiral tube.

[nike123]

we want "tank in tank "because we think it's more efficient---the heating area is bigger than spiral tube.

Did you make calculation on surface area of cylindrical tank of 200L and say 10m of pipe of 1" diameter?

Cylinder of 0,4m height and 0,4m radius has volume of cca 200L and active area (in other cylinder active is only mantle and bottom area) of cca 1,5m^2.

Pipe of 1" diameter and 10m lenght roled in spiral (8 windings of 0,2m radius) have active area of 1.59m^2.