Investigation of the Performance of a Heat Pump Using Waste Water as a Heat Source

Abstract

Abstract:In this research, a water-water heat pump system using waste water as a heat source, a type that is not often used in Turkey and the World, was experimentally modeled. The experiments were performed under the conditions of simulated waste water temperature values of 20 °C, 30 °C and 40 °C. Inlet and outlet water temperatures of the evaporator and condenser, water flow rates in the evaporator and condenser circuits, pressures at the compressor inlet and outlet and power consumption of the system were measured. The heating coefficients of performance were calculated based on the measurements. It was found that the maximum temperature in the energy storage tank was about 50.6 °C. For the heat source temperatures of 20 °C, 30 °C and 40 °C, the heating coefficients of the performance of the system became 3.36, 3.43 and 3.69, respectively, 6 min. after the start time of the experiments and then they were decreased to 1.87, 1.83 and 1.77 with increasing water temperature in the condenser tank. The mean uncertainty value of the measurement parameters was found to be about ±2.47%. Finally, for the purpose of meeting hot water need as well as floor heating system requirements, it is seen that energy quality level of a waste low grade temperature heat source can be increased by using a heat pump system.

A key review of wastewater source heat pump (WWSHP) systems

“…In [21], the authors presented an experimental setup of a WWSHP. The waste heat source temperature in the water tank was kept almost constant by using three electrical heaters with 2 kW power capacities.…”

“…9. Schematic illustration of experimental rig of the heat pump system (modified from [21]). the shower is collected in the gray water pool after utilization.…”

Experimental performance evaluation of a novel heat pump water heater assisted with shower drain water

“…In the past few decades, energy saving of hot water systems in buildings has been studied by a lot of researchers with respect to various components, such as solar collectors [3,4], heat pump [5][6][7], and heat recovery system [8,9] on the level of both technology and equipment. In Greece, the installation of solar collectors in apartment buildings can save 60-74% of energy, mainly depending on the building locations and climatic conditions.…”

The Innovative Concept of Cold District Heating Networks: A Literature Review

“…A similar system was installed near the Olympic village in Vancouver [54]. Heat recovery can also be achieved downstream of water treatments, where it is possible to find large flows and stable temperatures in comparison with sewers [55]. Heat recovery from wastewater is a fairly common system in Switzerland: for example, in the Bremgarten quarter in Berne about 60% of the heat demand is provided by heat pumps that extract thermal energy from treated water [54].…”