A 10-kW cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. Calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.

0.0625kg/s

0.9031kW

Explanation:

At state 1, enthalpy and entropy are determined from table R-134a.

P1 = 400kpa

h1 = 255.55kj

S1 = 0.92691

h2 = 270kj/kg

Enthalpy at states 3 and 4 can be gotten from the pressure and state with data from a-12

h3 = h4 = 95.48kj/kg

1.)

The mass flow rate

= QL/h1 - h4

= 10/255.55-95.48

= 10/160.07

= 0.0625kg/s

2.)

The power requirement

= 0.0625(270-255.55)

= 0.9031 kW

4. Making a few tacos and eating them to see how they taste.

Explanation:

The method of engineering design refers to the sequence of procedures that engineers undertake to reach a solution to a concerning problem. Generally,  the solution needs to create a machine or a product that fulfills specific requirements or performs a specific function. the step of testing and redesigning includes engineers to test their final design so that they can make change their solution to enhance it, based on their feedback and their experience with the solution. As per the question eating tacos will provide the appropriate feedback to make final changes to the tacos.