Tuesday, June 27, 2017: 9:45 AM-10:45 AM
HVAC&R Systems and Equipment
Chair:
Stephanie Kunkel, JMT
Several methods are presented on highly energy efficient components for HVAC systems. These technologies incorporate ground source heat pumps, gas heat pumps and test parameters to determine efficiency. Implementing heat pump technology is a hot trend. These projects show new elements that can increase overall system efficiency beyond what is currently employed.
1 Application of TPRTs (Thermal Performance/Response Tests) in a Saturated Porous Formation (LB-17-C039)
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Wonjun Choi, Ph.D., University of Tokyo
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Ryozo Ooka, Ph.D., University of Tokyo
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Thermal response tests (TRTs) are often conducted to inversely estimate the design parameters of borehole heat exchangers (BHEs); those are the effective thermal conductivity of ground and borehole thermal resistance. TRT can only provide the design parameters of a borehole heat exchanger, but it cannot provide the transient heat exchange rate of installed BHE which represents the actual performance of installed BHE. This paper proposes an estimation method of TPT that can provide both the thermal performance of BHEs and design parameters that usually obtained from TRT. Results showed that the performances of BHEs strongly depend on the inlet temperature. Additionally, transient heat exchange rates obtained from TPRTs provide valuable information on BHE performances that can be used for the design of BHEs.
2 Investigation of a Design and Operation Method for a Heat Recovery Ground Source Heat Pump System (LB-17-C040)
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Takao Katsura, Ph.D., Hokkaido University
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Katsunori Nagano, Ph.D., Hokkaido University
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Yasushi Nakamura, Ph.D., Nippon Steel & Sumikin Engineering
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The heat recovery ground source heat pump (HR-GSHP) system that has several types of GSHPs for different uses connected in the ground heat exchangers yields two types of heat recovery effects. The first one is the direct heat recovery effect obtained by operating the several types of GSHPs. The second one is the indirect heat recovery effect that utilizes the underground thermal storage effects and is brought by alternately operating the several types of GSHPs in the short term. By utilizing these two effects, the HR-GSHP can yield both energy saving effect and drastic reduction of the ground heat exchanger’s total length. This paper investigates the design and operation method of the HR-GSHP system.
3 Retrofit of Commercial Buildings Using a Gas Heat Pump System (LB-17-C041)
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Leticia De Oliveira Neves, Ph.D., University of Campinas
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In office buildings, the use of a Gas Heat Pump air-conditioning systems may be able to meet thermal demands with the same efficacy as a conventional electrical system while reducing energy demand of the whole building. This paper investigates technically, ambient and economically the substitution of a conventional air-conditioning system of an existing office building by a Gas Heat Pump air-conditioning system. The analysis was conducted through a data assembling of the potential of retrofit of operating office buildings in the city of Sao Paulo; through interviews with mechanical engineers and consultants; and through a case study developed in an existent office building, using computer simulation to evaluate energy performance of different air-conditioning scenarios.
