When discharge pressure rises while suction pressure stays constant in a refrigeration system, what happens to the heat of compression triangles?

When discharge pressure rises while suction pressure remains constant in a refrigeration system, the heat of compression triangles get larger due to the increase in the temperature and energy associated with the vapor compression process.

The heat of compression triangle represents the change in enthalpy from the suction to the discharge of the compressor. As the discharge pressure increases, the enthalpy of the refrigerant at the discharge side also increases, thereby expanding the overall area of the heat of compression triangle. This reflects that more energy is being added to the system during the compression process due to the higher pressure conditions.

In contrast, if the suction pressure were to change, it could influence the size of these triangles differently, but since we are considering a constant suction pressure, the primary factor here is the increase in discharge pressure. Hence, it leads to an increase in the energy conveyed by the compressor, which manifests as larger triangles indicating a greater heat of compression.