Water Source Heat Pump System Research Articles

Exergy Analysis of Mine Water Source Heat Pump System

This paper analyses exergy of the components of the mine water source heat pump. Evaluate the exergy efficiency and exergy loss of main components of mine water source heat pump. An example that is calculated and analyzed shows that the compressor is the main energy-saving target.

Performance analysis of an endoreversible heat pump system for optimal air-ground or water environmental exergy potential utilization

This paper reports the optimization of a ground or water source heat pump system for housing applications with respect to the best exergy performance and maximum environmental exergy potential use. The analysis presented also offers the opportunity of exploring a new objective for the optimization of the use of exergy sources: ‘In any system powered by an external exergy source optimization is achieved when the exergy flux to the environment is minimum under the existing constraints’. This corresponds to utilizing the supplied exergy to overcome the total irreversibilities of such a system only. The environmental exergy utilization and the exergy output to the environment are analyzed in connection with this objective. Copyright © 2008 John Wiley & Sons, Ltd.

Water Source Heat Pump for Modular Classrooms

ABSTRACT This work investigates and recommends design improvements for a water source heat pump system for mobile homes and modular classrooms. It builds on a previous study that tested a 3-ton geothermal heat pump in a modular classroom at Wilson Mills Elementary School in Johnston County, North Carolina. Water stored in flexible plastic bladders resting on the ground underneath the classroom served as the heat source. The bladders were filled with 2,000 gallons of saltwater. Using TRNSYS, a model of the original system was constructed and validated by comparing model predictions to measured performance. TRNSYS models of several new designs were constructed to evaluate potential design improvements. The system models were evaluated based on predicted performance for a typical meteorological year, and on other criteria such as initial cost, maintenance, and portability. This resulted in a new optimized system design in which the water storage volume is reduced to 120 gallons, and the predicted electrical ...

Moderately high temperature water source heat-pumps using a near-azeotropic refrigerant mixture

A ternary mixture of R124/R142b/R600a, named HTR01, for moderately high temperature heat pumps, was developed. Tests of material compatibility and oil miscibility showed that the mixture could be used with a R22 compressor in an HTR01 heat-pump system. A 2.92 kW moderately high temperature water source heat pump system was set up with HTR01 as the refrigerant to study the system performance with HTR01. Then, a 300 kW moderately high temperature water source heat pump system was built with HTR01 as the refrigerant to test the performance with a geothermal hot water source. The test showed that the condenser outlet water temperature could reach and hold on about 90 °C with a high coefficient of performance.

Phase Change Energy Storage for Solar Heating Systems

In this study, the cylindrical phase change energy storage tank linked to the water source heat pump system is investigated theoretically and experimentally. A simulation model defining the transient behavior of the phase change unit was used. In the solar energy storage tank, the phase change material (PCM) is inside cylindrical plastic tubes and heat transfer fluid (water) flows parallel to it. The heat transfer problem of the PCM was solved numerically using an enthalpy-based finite differences method and was validated against the experimental data. The experiments were performed for clear days during the winter season in Trabzon, Turkey. In the experimental study, the mean temperature of the water and the temperature distribution of the PCM in the tank were measured. The inlet and outlet water temperature of the tank and the inlet and outlet temperature of the solar collectors and the water-source heat pump are also measured. The experimentally obtained inlet and outlet water temperatures are also taken as inlet/outlet water temperatures in the simulation model. Thus the theoretical temperature and stored heat energy distribution in the energy storage tank have been determined by using a computer program developed previously. In this study, solar radiation on horizontal and tilted surfaces in Trabzon are also measured and calculated while the collector and storage efficiencies have been calculated. The theoretical results were found to be in good agreement with the experimental values.

Phase Change Energy Storage for Solar Heating Systems

In this study, the cylindrical phase change energy storage tank linked to the water source heat pump system is investigated theoretically and experimentally. A simulation model defining the transient behavior of the phase change unit was used. In the solar energy storage tank, the phase change material (PCM) is inside cylindrical plastic tubes and heat transfer fluid (water) flows parallel to it. The heat transfer problem of the PCM was solved numerically using an enthalpy-based finite differences method and was validated against the experimental data. The experiments were performed for clear days during the winter season in Trabzon, Turkey. In the experimental study, the mean temperature of the water and the temperature distribution of the PCM in the tank were measured. The inlet and outlet water temperature of the tank and the inlet and outlet temperature of the solar collectors and the water-source heat pump are also measured. The experimentally obtained inlet and outlet water temperatures are also taken as inlet/outlet water temperatures in the simulation model. Thus the theoretical temperature and stored heat energy distribution in the energy storage tank have been determined by using a computer program developed previously. In this study, solar radiation on horizontal and tilted surfaces in Trabzon are also measured and calculated while the collector and storage efficiencies have been calculated. The theoretical results were found to be in good agreement with the experimental values.

河川水熱利用地域冷房施設の大気への熱的影響に関する研究

District cooling by water source heat pump system is more effectual than by air source one, and also heat release to the air in utilizing area disappears. But the other hand, it's feared to decrease "cool island" effect of river that the river water temperature changes. In this study, at first, difference of artificial exhaust heat by cooling between cooling systems was discussed and exhaust air conditions through cooling tower or air to air heatexchanger were discussed. At last, thermal effects on atmosphere caused by district cooling utilizing river water at Tokyo area were estimated.

Solar hybrid heating systems for greenhouses

Theoretical prediction of the total heat requirements of a greenhouse using several solar hybrid systems under various representative Jordanian ambient conditions have been carried out. Either an air-source heat pump, a water-source heat pump, a boiler, and electric-resistance element system or a combination of these was considered as the heat source. The operation-cost analysis which was carried out indicated that for the given ambient conditions the hybrid solar heat-pump system was in general the most economic.