A question on Heat-Pump.

[lana]

Hi everybody,
I am designing an air-conditioning package with heat pump. Because the cooling capacity is relatively high (16kW) then I have decided to use TEV instead of cap. Tube. Therefore, I have too use two TEVs , one for cooling and for the heating cycle.
My question is this : can I install the heating cycle TEV's bulb on to the suction of the compressor (after the 4-way valve) so there will be no over-pressurization (in the valves bulb) during the cooling cycle? A schematic picture is attached.
Also, what would be the heating cycle TEV's capacity? (to select the orifice).
Thanks for any feed back.
Cheers.