Abstract
Water loop heat pump (WLHP) air conditioning systems use heat pumps connected to a common water circuit to fulfill the energy demands of different thermal zones in a building. In this study, the energy consumption was analyzed for the air conditioning of an office building in the typical climate of four important cities of the Iberian Peninsula. The energy consumption of one water loop heat pump system was compared with a conventional water system. Two design parameters, the range in the control temperatures and the water loop thermal storage size, were tested. Energy redistribution is an important advantage of the WLHP system, but significant savings came from high efficiency parameters in the heat pumps and minor air flow rates in the cooling tower. The low thermal level in the water loop makes this technology appropriate to combine with renewable sources. Using natural gas as the thermal energy source, a mean decrease in CO2 emissions of 8.1% was reached. Simulations showed that the installation of big thermal storage tanks generated small energy savings. Besides, the total annual consumption in buildings with high internal loads can be reduced by keeping the water loop as cool as possible.
Highlights
Water loop heat pump (WLHP) systems are common in the air conditioning of commercial and office buildings
The present study analyzed the behavior of a WLHP system in a common office building under system with a four-tube connection design to allow simultaneous heatingThe andenergy cooling loads, fan-coils, typical climatic conditions in four important cities in the Iberian Peninsula
The calculation of the energy demands of a conventional office building has been performed by means of the building energy simulation software EnergyPlus
Summary
Water loop heat pump (WLHP) systems are common in the air conditioning of commercial and office buildings. The present study analyzed the behavior of a WLHP system in a common office building under system with a four-tube connection design to allow simultaneous heatingThe andenergy cooling loads, fan-coils, typical climatic conditions in four important cities in the Iberian Peninsula. WLHPand system a water tower with a four-tube connection to allowletting simultaneous heating and cooling loads, fankeep thesystem temperature of the water loopdesign in a range, it freely oscillate while the temperature gas boiler and a conventional chiller. The effect of changing minimum and maximum temperature set points keep the temperature of the water loop in a range, letting it freely oscillate while the temperature is regulation system was studied, comparing annual consumption with a base case. Optimization of the design of WLHP systems, reducing energy consumption for office building air conditioning
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