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Distributed cogeneration in single households may provide a viable alternative to the construction of new central power plants in the coming years. A key issue in residential cogeneration is how to size and integrate the required technologies in order to satisfy the total energy needs of the household, consisting of electricity, domestic hot water, space heating and space cooling. An interesting pathway to a more sustainable future involves the use of the earth surrounding the home as both a source and a sink for energy, especially if it enables the recycling of summertime waste heat from the generator. This demonstration project was planned and implemented at the Canadian Centre for Housing Technology (CCHT) in 2006. The CCHT, located on the campus of the National Research Council in Ottawa, Ontario, Canada maintains two detached, single-family houses that have the capacity to assess energy and building technologies with daily simulated occupancy effects. This paper describes the residential total energy system installed in one of the houses at the CCHT, consisting of two one-ton ground source heat pumps, an air handler for supplemental/back-up heating, a natural gas fired hot water tank, an indirect domestic hot water tank and a multistage thermostat. The bore-field consists of three vertical wells arranged to suit a typical suburban landscape. Two of the wells serve the heat pumps and the third well is arranged between the other two to sink the waste heat from a cogeneration unit to be installed in May 2007. The heat pump system was sized to satisfy the cooling load in Canada’s heat dominated climate, leaving room in the operation of the system to accept waste heat from the cogeneration unit, either directly or indirectly by recycling the heat through the ground to the heat pumps. Following an earlier paper which introduced the installation and described initial ground thermal response testing, this paper presents, summarizes and discusses operational results of the heat pump system in heating mode over a continuous 47 day period ending December 21, 2006. The paper will also describe the configuration planned for the recovery of heat from the cogeneration system when installed in May 2007.

Residential Total Energy System Testing at the Canadian Centre for Housing Technology