Respuesta :
Answer:
The correct answer is:
c) Discharge pressure is higher in water-cooled condensers; operational cost is lower.
Explanation:
Water-cooled condensers typically have higher discharge pressure compared to air-cooled condensers. This is because water-cooled condensers use water as the cooling medium, which provides better heat transfer efficiency compared to air. As a result, water-cooled condensers can operate at higher pressures to achieve the desired cooling effect.
However, despite the higher discharge pressure, water-cooled condensers often have lower operational costs compared to air-cooled condensers. This is because water-cooled condensers typically consume less energy for cooling due to the superior heat transfer properties of water. Additionally, water is often more readily available and cheaper than the electricity required to power air-cooled condensers, further contributing to the lower operational cost of water-cooled condensers.
Final answer:
The correct answer is that discharge pressure is lower in water-cooled condensers and operational costs are generally lower as well, due to higher heat transfer efficiency. However, this doesn't take into account higher potential maintenance and water usage costs of water-cooled systems.
Explanation:
When comparing the discharge pressure and operational cost of air-cooled condensers versus water-cooled condensers, it's important to understand the basic operation of both systems. Air-cooled condensers use the surrounding air to cool and condense the refrigerant, while water-cooled condensers use water as a cooling medium. Generally, discharge pressure is higher in air-cooled condensers because the temperature of the surrounding air is greater than the temperature of the cooling water used in water-cooled condensers, leading to higher condensing temperatures and pressures. On the other hand, water-cooled condensers usually operate at lower discharge pressures since water can remove heat more efficiently than air. This results in lower operational costs for water-cooled systems, as they require less energy to achieve the same level of cooling, although they may have higher maintenance costs and water consumption issues. To summarize, option (c) 'Discharge pressure is higher in water-cooled condensers; operational cost is lower' is incorrect, and the correct answer should be option (d) 'Discharge pressure is lower in water-cooled condensers; operational cost is higher', assuming maintenance and water costs are not considered.
