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Impact of virtual building model and thermostat installation on performance and dynamics of variable-speed equipment during load-based tests.

Number: pap. 2713

Author(s) : CHENG L., PATIL A, DHILLON P., et al.

Summary

To better characterize the performance of variable-speed DX (Direct Expansion) equipment in a laboratory environment, a load-based psychrometric chamber testing methodology has been developed as an alternative to existing steady-state testing approaches. The methodology allows equipment to respond dynamically to a virtual building model using its integrated controls. To mimic an actual building, a virtual building model incorporates sensible and latent loads along with simple lumped capacitance building dynamics that interact with the variablespeed equipment. The rated capacity of the test equipment is used along with a specified sizing factor and target sensible heat ratio (SHR) to specify the building sensible and latent load models.

Two companion papers (Patil el al. (2018) and Dhillon et al. (2018)) present the overall methodology and results for different variable-speed heat pumps using default building parameters. This paper studies the impact of the virtual building sizing factor on overall performance and dynamic behavior of the equipment for load-based testing. It is shown that equipment seasonal performance can increase significantly with increasing sizing factor and therefore it is important to specify representative values. In addition, performance increases with decreasing building sensible heat ratio (SHR). In addition, the impact of the thermostat location on equipment dynamics and performance ratings is considered. The seasonal performances and repeatability of load-based tests are sensitive to the choice of thermostat location. Therefore, it is important to define a strategy for locating the thermostat in a manner that will lead to reproducible results across different laboratory testing facilities.

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Pages: 10

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Details

  • Original title: Impact of virtual building model and thermostat installation on performance and dynamics of variable-speed equipment during load-based tests.
  • Record ID : 30024722
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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