Engineering Thermodynamics
Diesel cycle consists of following four processes

Two isentropic and two constant volumes
Two isentropic and two constant pressures
Two isothermal and two isentropic
Two isentropic, one constant volume and one constant pressure

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Internal energy, enthalpy and entropy during a process remain constant
Total internal energy of a system during a process remains constant
Work-done by a system is equal to the heat transferred by the system

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