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ABSTRACT
The race between the development of technologies and energy demand has drawn the guidelines of energy strategies for the next two decades. Indeed, the governmental organizations as well as the private sectors are spending huge effort to come up with new adequate strategies that allow to decrease energy consumption. Having said that, heat pump becomes an essential system in our daily life not only in residential building but also in hospital, industrial and touristic building. Nonetheless, (HP)s have very high energy consumption rate. Thus, and to be in line with the new trends in energy strategies, it is convenient to find new methods to enhance the performance of heat pump in order to reduce energy consumption. In this frame, the present paper suggests an approach to enhance the performance the heat pumps using the heat recovery from generators. For this purpose, an in-house code is developed allowing to simulate two new proposed systems (condenser upstream exhaust gases heat recovery system (CU-EGHRS) and condenser downstream exhaust gases heat recovery system (CD-EGHRS). It has been shown that the increase in the performance of the heat pump depends on the capacity of the generator. Also, the CD-EGHRS is shown to be the best. For instance, in the case of a 15 kVA generator, the enhancement could reach 42% for the CD-EGHRS. This enhancement increases to 5640% in the case of a 180 kVA generator.
Nomenclature
| COP | = | Coefficient Of Performance |
| Cp | = | Specific heat at constant pressure, kJ/kg.K |
| CD-EGHRS | = | Condenser downstream heat recovery system |
| CU-EGHRS | = | Condenser upstream heat recovery system |
| EGHRS | = | Exhaust gases heat recovery system |
| E | = | Energy, kWh |
| h | = | Specific enthalpy, kJ/kg |
| HP | = | Heat Pump |
| M | = | Amount, kg |
| = | Mass flow rate, kg/s | |
| P | = | Pressure, bar |
| = | Rate of heat, kW | |
| RHEX | = | Recovery heat exchanger |
| s | = | Specific entropy, kJ/kg.K |
| t | = | Time, s |
| T | = | Temperature, C |
| = | Rate of work or Power, kW | |
| ε | = | Effectiveness |
Subscript
| Cond | = | Condenser |
| Comp | = | Compressor |
| EG | = | Exhaust gases |
| Evap | = | Evaporator |
| a | = | air |
| DW | = | Drain Water |
| i | = | Inlet |
| is | = | Isentropic |
| Max | = | Maximum |
| Min | = | Minimum |
| o | = | Outlet |
| r | = | running |
| Ref | = | Refrigerant |