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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 10 P‐h Chart – Simple System The pressure enthalpy chart below shows an example simple R744 system operating subcritically at a low ambient temperature (the pink cycle) and transcritically at a higher ambient temperature (the green cycle). The chart shows that the cooling capacity at the evaporator is significantly less for transcritical operation. Pressure enthalpy chart showing sub and transcritical operation When it is transcritical the refrigerant does not condense in the gas cooler, its temperature drops and heat is rejected. The refrigerant does not condense until its pressure is dropped below the critical pressure (72.8 bar g). When transcritical, the gas cooler pressure is a function of the quantity of refrigerant in the gas cooler (unless it is controlled). The supercritical fluid temperature reduces as it passes through the gas cooler and its temperature at the exit of the gas cooler is a function of the gas cooler size and the air on temperature. When operating above the critical point, an increase in the high side pressure increases the cooling capacity, as can be seen from the pressure enthalpy chart in figure 3. The best operating pressure is condition 3 because there is not a significant energy penalty for the increase in capacity compared to condition 1.PDF Image | Alternative Refrigerants
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