One Problem about Thermodynamics
A Vapor compression refrigeration does contain an evaporated pressure or a low side pressure and a condenser pressure. In the diagram, we understand that the systems will remain adequate as long as the transformation in the condenser and evaporator is small. We usually use a multi-stage vapour compression refrigerator during a demand in the increase of the temperature lift (ZHANG et al. 2020). When heat is about negative 30 in the refrigerant property, we achieve an estimated Pressure (kPa) of about 163.9. Dryness fraction of about 1.0. An Enthalpy KJ/Kg of about 392.7kj/kg and Entropy of about 1.802kj/kg.k.
Solution.
To understand the refrigerant mass flow rate;
Mr,1 = 0.692kg/s
The power involvement in the first period compressor, Wc,1 represent;
Wc,1=mr,1(h2-h1)=0.692(424.4-391.7)=21.97kW
The mass flow through the second phase compressor achieved from energy balance across the intercooler.
Mr,2.h2 = mr.h2 + (mr12 – mr1).h4
Substitution
Mr,2 =0.768kg/s
The second phase compressor includes
Wc,2 =mr,2(h2”-h2”) =0.768(429.6-407.2) = 17.2kW
Wc=Wc,1 + Wc,2 = 21.97+ 17.2 equal to 39.17kW
Therefore, COP =Qe/(Wc,1+Wc,2) = 100/39.17 =2.553.
Thermodynamics refers to a branch of physics that involves the association between forms of energy and heat—for instance, chemical energy, mechanical and electrical. By extension, thermodynamics does comprise of all the relationship between broad forms of energy. Thermodynamics consists of three laws that that represented by ordinal identification. The regulations include the first law, the second law and the third law (ZHANG et al. 2020). The first law has a limitation, as it does not present explicit information about the direction of heat. We cannot understand whether the process is spontaneous or not. When we decide to use the practical concept, we find that heat does not completely transform into work. The whole process is just impossible.
References
ZHANG, X., ZIVIANI, D., BRAUN, J. E., & GROLL, E. A. Performance Analysis of Vapors Compression Refrigeration Systems with Oil-free Linear Compressor vapour Injection and Regeneration.