Experimental Results of a Gas Fired Adsorption Heat Pump and Simulative Prediction of Annual Performance in a Multi-Family House. (25th July 2022)

• Record Type: Journal Article
• Authors: Velte, Andreas; Laurenz, Eric; Leisner, Simon; Weber, Josef; Wittstadt, Ursula; Füldner, Gerrit
• Is Part Of: Applied thermal engineering. Volume 212(2022)
• Publication Date: 2022-07-25
• Subjects: ADHX adsorption heat exchanger -- BRN burner -- EC evaporator-condenser -- GAHP gas adsorption heat pump -- GCV gross calorific value -- GUEh gas utilization efficiency heating -- HDS heat distribution system -- HT high temperature -- HX heat exchanger -- LT low temperature -- LTS low temperature system -- MOD sorption module -- MT medium temperature -- NCV net calorific value -- SAPO-34 silicoaluminophosphate zeo-type adsorbent -- sGUEh seasonal gas utilization efficiency heating; Gas adsorption heat pump -- SAPO-34-water -- Exhaust air -- Transient annual simulation; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2022.118581
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Development of a functional prototype of a SAPO-34-water gas adsorption heat pump. Analysis of low-temperature heat sources 'borehole heat exchanger' and 'exhaust air'. Measurement includes sensors to calculate the energy balance of each component. Calibration and validation of component models and of the functional prototype. Transient annual simulation of GAHP within heating system with Modelica/Dymola. Abstract: Gas driven sorption heat pumps can be an efficient alternative to conventional gas condensing boilers for heating buildings. Measurement results of a functional prototype of a gas adsorption heat pump with 40 kW nominal capacity and the SAPO-34-water working pair are presented. The innovative adsorption heat exchanger is directly crystallized applying the partial support transformation technique. A transient lumped-parameter model of the gas adsorption heat pump is developed. For the first time, it is possible to perform an annual simulation of the GAHP within the heating system of a multi-family house with full adsorption dynamics based on calibrated and validated component models. This annual performance calculation is carried out for the two different low-temperature heat sources geothermal heat (bore hole heat exchanger) and exhaust air. Using exhaust air as low-temperature heat source for a GAHP is an entirely new approach that is evaluated in this study. Compared to a gas condensing boiler, the annual gas consumption is reduced by 22 % for the case of bore hole heat exchanger and by 27 % for the case of exhaust air as low-temperature heat source for a building with heating circuit design temperatures of 45 °C/35 °C.