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Blackman, Corey
Publications (2 of 2) Show all publications
Blackman, C., Gluesenkamp, K. R., Malhotra, M. & Yang, Z. (2019). Study of optimal sizing for residential sorption heat pump system. Applied Thermal Engineering, 150, 421-432
Open this publication in new window or tab >>Study of optimal sizing for residential sorption heat pump system
2019 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 150, p. 421-432Article in journal (Refereed) Published
Abstract [en]

Gas-driven sorption heat pumps (GDSHP) show significant potential to reduce primary energy use, associated emissions and energy costs for space heating and domestic hot water production in residential applications. This study considered a bivalent heating system consisting of a sorption heat pump and a condensing boiler, and focuses on the optimal heating capacity of each of these components relative to each other. Two bivalent systems were considered: one based on a solid chemisorption cycle (GDSHPA), and one based on a resorption cycle (GDSHPB). Simulations of year-round space heating loads for two single-family houses, one in New York and the other Minnesota, were carried out and the seasonal gas coefficient of performance (SGCOP) calculated. The sorption heat pump's design heating capacity as a fraction of the bivalent system's total heating capacity was varied from 0 to 100%. Results show that SGCOP was effectively constant for sorption heat pump design capacity greater than 41% of the peak bivalent GDSHPA design capacity in Minnesota, and 32% for GDSHPB. In New York, these values were 42% and 34% for GDSHPA and GDSHPB respectively. The payback period was also evaluated based on postulated sorption heat pump component costs. The fastest payback was achieved with sorption heat pump design capacity between 22 and 44%.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Bivalent, Residential, Sizing, Sorption heat pump, Energy utilization, Gas emissions, Heat pump systems, Housing, Investments, Pumps, Sorption, Space heating, Condensing boilers, Domestic hot water, Residential application, Single-family house, Sorption heat pumps, Heating
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-43052 (URN)10.1016/j.applthermaleng.2018.12.151 (DOI)000462418200037 ()2-s2.0-85059855024 (Scopus ID)
Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-11Bibliographically approved
Zhu, C., Gluesenkamp, K. R., Yang, Z. & Blackman, C. (2019). Unified thermodynamic model to calculate COP of diverse sorption heat pump cycles: Adsorption, absorption, resorption, and multistep crystalline reactions. International journal of refrigeration, 99, 382-392
Open this publication in new window or tab >>Unified thermodynamic model to calculate COP of diverse sorption heat pump cycles: Adsorption, absorption, resorption, and multistep crystalline reactions
2019 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 99, p. 382-392Article in journal (Refereed) Published
Abstract [en]

A straightforward thermodynamic model is developed in this work to analyze the efficiency limit of diverse sorption systems. A method is presented to quantify the dead thermal mass of heat exchangers. Solid and liquid sorbents based on chemisorption or physical adsorption are accommodated. Four possible single-effect configurations are considered: basic absorption or adsorption (separate desorber, absorber, condenser, and evaporator); separate condenser/evaporator (two identical sorbent-containing reactors with a condenser and a separate direct expansion evaporator); combined condenser/evaporator (one salt-containing reactor with a combined condenser/evaporator module); and resorption (two sorbent-containing reactors, each with a different sorbent). The analytical model was verified against an empirical heat and mass transfer model derived from component experimental results. It was then used to evaluate and determine the optimal design for an ammoniate salt-based solid/gas sorption heat pump for a space heating application. The effects on system performance were evaluated with respect to different working pairs, dead thermal mass factors, and system operating temperatures. The effect of reactor dead mass as well as heat recovery on system performance was also studied for each configuration. Based on the analysis in this work, an ammonia resorption cycle using LiCl/NaBr as the working pair was found to be the most suitable single-effect cycle for space heating applications. The maximum cycle heating coefficient of performance for the design conditions was 1.50 with 50% heat recovery and 1.34 without heat recovery. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Ammonia, Analytical, Dead thermal mass, Heat recovery, Resorption, Sorption heat pump, Adsorption, Evaporators, Heat pump systems, Lithium compounds, Mass transfer, Separation, Sorbents, Space heating, Thermodynamic properties, Waste heat, Waste heat utilization, Direct expansion evaporators, Heat and mass transfer models, Heating coefficients, Operating temperature, Sorption heat pumps, Thermal mass, Coefficient of performance
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-42697 (URN)10.1016/j.ijrefrig.2018.12.021 (DOI)000461334900038 ()2-s2.0-85060929731 (Scopus ID)
Available from: 2019-02-15 Created: 2019-02-15 Last updated: 2019-03-28Bibliographically approved

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