Answer Happy

An air-cooled packaged air conditioning unit with a hot water heating coil is to be used to
condition a small office suite in a high-rise office building. The unit has a total cooling
capacity of 15 kW, and the power requirement to the compressor is 0.3 kW per kW of
cooling.
(a) What is the Carnot COP between 4.4°C suction temperature and 47°C condensing
temperature for air-cooled unit?
(b) What will be the Carnot COP between 4.4°C suction temperature and 41°C condensing
temperature if a water-cooled unit is used instead of an air-cooled unit?
(c) Comment on the efficiency of water-cooled system with air-cooled system based on the
Carnot COP.
An air-cooled packaged air conditioning unit with a hot water heating coil is to be used to condition a small office suite in a high-rise office building. The unit has a total cooling capacity of 15 kW, and the power requirement to the compressor is 0.3 kW per kW of cooling. (a) What is the Carnot COP between 4.4°C suction temperature and 47°C condensing temperature for air-cooled unit? (b) What will be the Carnot COP between 4.4°C suction temperature and 41°C condensing temperature if a water-cooled unit is used instead of an air-cooled unit? (c) Comment on the efficiency of water-cooled system with air-cooled system based on the Carnot COP.