A technical question.
Using R22 I want to know what is the idea range of head pressure to get the maximum heat out if the system with the least power input, IE the most efficient head pressure on heating.
Please no guesses, I do not want to run the system at 400 PSI and chew up heaps of power.
I have ways of controlling the suction pressure thus controlling the head pressure within some limits. The condenser (Outdoor coil) is somewhat oversized so that again allows me a range of suction pressures while the unit is running on heating. Both the heating and cooling modes have TX valves for refrigerant control and there is a receiver in the system.
No worries about low temperature IE freezing the outdoor coil as it does not get all that cold here.
As I said the main aim is to get a good heat result with a minimum of power usage.
So what PSI should I aim at from a design point of view on heating and economy?
Before a first year apprentice starts to tell me what the answer is, I have been involved in air conditioning for many decades, so am knowable on it. My design experience is mainly on straight cooling systems.
I designed a 175 ton plant (the biggest I have designed) and started up one system that had 9 ton of refrigerant in it. Plus I commissioned a few plants that had 3,300 volt motors driving the compressors.
Not that I had anything to do with it but I saw one interesting reverse cycle plant which had multiple large fan coil units and had 6 x Carrier 5H120 compressors on it all coupled together.
For those not familiar with the Carrier 5H120 compressors they have usually something like a 100-125 HP motor driving each of them and are an unloading 12 cylinder compressor.
Nominal tonnage is 120 tons. The system beside having evaporators and a condenser had balancing coils to take up any imbalance in the system, as any of the fan coils could heat or cool simultaneously if required as there were both heating and cooling coils in each fan coil unit.