PSIG is psi Gauge, i.e. does not include air pressure. PSID is psi differential, checks for delta-P across things like filters, pumps, etc.
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PSIG stands for pounds per square inch gauge and measures pressure relative to atmospheric pressure, while PSID stands for pounds per square inch differential and measures the pressure difference between two points. PSIG is commonly used in pressure measurement devices, while PSID is often used in differential pressure devices like flow meters or filters.
(psi x 6.89476 = kPa). So, 70 psi x 6.89476 = 482.633 kPa
0.5 psig is equivalent to 13.8 inches of water column.
50 psig is equivalent to 64.7 psi. To convert psig to psi, you simply add the atmospheric pressure at sea level, which is about 14.7 psi.
The evaporator superheat for this system would be 18°F. This is calculated by subtracting the evaporator outlet temperature of 58°F from the saturation temperature of the refrigerant at 76 psig, which is 76°F. The difference between the two temperatures gives the evaporator superheat.
Liquid subcooling is the difference between the condenser outlet temperature and the saturation temperature of the refrigerant. For R22 with a condenser outlet temperature of 108°F at 260 psig, the saturation temperature is approximately 94°F, resulting in a liquid subcooling of 14°F.