Optimization Of Heat Pump System Research Articles

Modelling and optimization of the heat pump system for the usage of swimming pool

Heat pump is a device which being used to transfer heat energy from one or more heat sources at low temperature to one or more heat sinks at high temperature simultaneously through pumping. The heat pump system used in swimming pool is an air –to-water heat pump that made up of four elements, which are evaporator, compressor, condenser and expansion valve. The overall efficiency of the heat pump in recovering the heat energy with the least of work done needed is defined as Coefficient of Performance (COP). A calculation software interface is designed using programming language of Visual Basic in Microsoft Visual Studio software to model, simulate the operation of heat pump product in actual industrial application and aid the optimization of heat pump system. The calculation software interface developed generates high accuracy COP value at 4.90, which has only 0.62% difference compared to actual COP of the heat pump product at 4.87. In order to optimize the performance of heat pump, the number of turns of outer and inner coil in condenser and the water flow rate pumped into the condenser are changed to maximize the COP within allowable cost increment. The COP is improved from 4.90 to 5.52, 5.13 and 6.89 based on each respective optimizations with cost increment controlled in between 0.5 to 2%. The final COP improved is obtained at 8.06 through combined optimization.

Optimization of heat pump system

The purpose of this study is to produce a mathematical model to describe the operation of a water-to-water heat pump system for steady-state condition. The set-up model is deterministic. It consists of distributed as well as lumped parameters. The proposed mathematical models of heat exchangers were described by coupled differential equations, while the models of the compressor and the expansion valve are of lumped parameters. The Runge–Kutta and the Adams–Moulton predictor-corrector methods were applied for the numerical solution of differential equations, i.e. the equation systems. The developed mathematical model is validated with 118 tests using R134a as a working fluid. The results show that an average difference between the modeled and experimental results for the coefficient of performance is 1.73%, which means that the proposed mathematical model can be used to determine the optimum operating point of a heat pump system for a given heat demand for heating, by determining the maximum value of the coefficient of performance.

Optimization of heat pump system in indoor swimming pool using particle swarm algorithm

When it comes to indoor swimming pool facilities, a large amount of energy is required to heat up low-temperature outdoor air before it is being introduced indoors to maintain indoor humidity. Since water is evaporated from the pool surface, the exhausted air contains more water and specific enthalpy. In response to this indoor air, heat pump is generally used in heat recovery for indoor swimming pools. To reduce the cost in energy consumption, this paper utilizes particle swarm algorithm to optimize the design of heat pump system. The optimized parameters include continuous parameters and discrete parameters. The former consists of outdoor air mass flow and heat conductance of heat exchangers; the latter comprises compressor type and boiler type. In a case study, life cycle energy cost is considered as an objective function. In this regard, the optimized outdoor air flow and the optimized design for heating system can be deduced by using particle swarm algorithm.