engleski

Energy use in central air-conditioning system with heat pump and coil energy recovery loop

Generally, by applying the energy recovery equipment in the air-conditioning systems, heating and cooling energy consumption for the supply air preparation, fuel consumption, size requirements for primary utility equipment, and indirectly the environment pollution (emission of the harmful flue gasses and waste heat of the burning process) are reduced. A coil energy recovery loop is one of the air-to-air sensible heat recovery systems, with seasonally reversible energy transfer. In this paper, hour-by-hour energy analysis of a low-velocity central air-conditioning system with both heat pump and coil energy recovery loop was performed. For this purpose, weather data, formed in the Typical Meteorological Year for the Zagreb-area, were used. Simulation model of the complete system, up to the level of secondary equipment load calculation, was developed. The model consists of two integrated parts: calculation of the heat loss and heat gain to the space and determination of the heating and cooling load imposed on the air conditioning system. Calculation procedure is based on the heat balance method combined with first-order conduction transfer functions. Besides the simulation, the measurements on coil energy recovery loop were performed. Differences between the simulation and measurement results were about ±3% or smaller. Energy use results for the system components were presented in the proper graphs and also compared to the results obtained for standard central air-conditioning system and air-conditioning system with heat pump. The results have shown that energy use of the system is decreased up to 30%, compared to the standard system. On the other hand, energy saving of the system with heat pump and coil energy recovery loop working together, compared to the system with only heat pump, isn’t significant for most standard applications.

air-conditioning; coil energy recovery loop; heating and cooling capacity; simulation model; system efficiency

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