Thermal modeling and operating tests for the gas engine-driven heat pump systems

Variable speed heat pump design for frequency regulation through direct load control

“…2 describes P m , which is almost linearly dependent on r in a steady state for the various ambient and indoor air temperatures T c_amb and T e_air , respectively, as represented in (1). The linear dependence is consistent with the specification or experimental data of the commercial VSHPs considered in [7]- [9]. Step response Pm(t) due to the unit step change of (a) r(t) and (b)…”

Experimental study on cooling performance and energy saving of gas engine-driven heat pump system with evaporative condenser

“…And the variation tendency of the cooling capacity, gas engine energy consumption, gas engine waste heat, COP and PER with the gas engine speeds and evaporator water inlet temperature was indicated. Sanaye et al [13][14][15] performed the dynamic modeling of GEHP system during startup in cooling mode and heating mode. The results showed that the comparison between empirical and modeling was an acceptable agreement and the maximum difference values of gas engine energy consumption was 9.51% in cooling mode, the maximum difference values of primary energy ratio was 6.2% in heating mode.…”

Advanced exergoeconomic analysis of a gas engine heat pump (GEHP) for food drying processes

“…An internal combustion gas engine is used to drive the compressor instead of an electric motor [12]. Many investigators have focused on GEHPs used for air conditioning, operational control, and few of them have considered water cooling or heating applications [13][14][15][16][17][18].…”