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Design of a system for the production of domestic hot water from wastewater heat recovery based on a heat pump optimized to work at high water temperature lift.

Number: pap. 3185

Author(s) : HERVÁS-BLASCO E., MARCHANTE-AVELLANEDA J., NAVARRO-PERIS E., et al.

Summary

Sewage water or water from condensing loops are potential heat sources that usually are wasted although they usually have slightly higher temperature than the ambient (20-40ºC). Water-to-water heat pumps (WtWHP) for space heating, cooling or water heating applications are a mature technology that can use this heat in order to produce domestic hot water with high efficiency. In previous works, some heat pumps prototypes has been developed in order to perform this operation with a high efficiency and some alternatives has been proposed in order to adapt the vapor compression cycle to this kind of application with a high hot water temperature lift. The main objective of the present work is to study the best system configuration in order to use the wastewater heat to satisfy a hot water demand with a WtWHP. The solution is based on the HP prototype presented in (Miquel Pitarch, 2017) a preheater recovery heat exchanger (HE) and a hot water variable volume storage tank (DHW-st). The HP is optimized from the exergetic point of view to work with high water temperature lifts in the condenser with subcritical conditions and high COPs. This is possible by the integration of a control system that optimizes the subcooling in the condenser based on external conditions. This configuration and operation allows the HP to operate with COPs up to 6 based on external conditions. A model of the whole system using the Trnsys software has been developed and based on it, the size of the binomial HP- DHW-st has been analyzed for different DHW demand profiles. This work shows the importance of the proper sizing of these components in order to optimize the system performance. Finally, the HP CO2 emissions compared to gas boiler has been analyzed.

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Pages: 10

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Details

  • Original title: Design of a system for the production of domestic hot water from wastewater heat recovery based on a heat pump optimized to work at high water temperature lift.
  • Record ID : 30024740
  • Languages: English
  • Source: 2018 Purdue Conferences. 5th International High Performance Buildings Conference at Purdue.
  • Publication date: 2018/07/09

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