All the standard components are well documented within TRNSYS and are open source.
The majority of components used in the model are standard, with the types listed below in Table 2. A schematic of the model is included below in Fig. The experimental apparatus operates almost identically to a real SAHP system, except that the STC is substituted for an in-line electrical heater. The weather data included with TRNSYS was used for the simulations and was duplicated for the experimental apparatus. The water draw profile used is from the Canadian Standards Association Packaged solar domestic hot water systems (liquid-to-liquid heat transfer) and is listed in Table 1.
Weather and water draw data from the TRNSYS simulation are supplied to the test rig, allowing for direct comparison between model and experiment. This system is mirrored in a TRNSYS simulation, which is the subject of the validation.īuilding upon previous work, where SAHP system modes of operation were validated using the test rig, TMY data is used both to simulate system performance and validate results experimentally for a representative day. An automatic control strategy is programmed into the apparatus to control the mode of operation selected.
Trnsys open source full#
Results are compared to output from TRNSYS simulations to validate the system model for advanced exploratory use, supporting the development of system configurations, equipment selection, and control strategies.Ī full day test comprises of running the experimental system over the course of a day with the input of weather data and a water draw profile. The test rig allows the performance of several SAHP system configurations to be evaluated experimentally. This work has been preceded by a paper which outlines in detail the construction, operation, and preliminary testing of said test rig. The TRNSYS model is validated using a test rig that has been built specifically for this purpose. The objective of the current work is to validate a TRNSYS (TRaNsient SYstem Simulations tool) model of the described SAHP system for representative days from typical meteorological year (TMY) data for Ottawa, Ontario, Canada. The equipment is connected via 2-way motorized diverter valves, which provide two independent paths to charge the DHW tank via solar energy: HX and HP. The SAHP system investigated in this work consists primarily of a 2.494 m2 solar thermal collector (STC), a 44 kW plate-type heat exchanger (HX), a 3.8 kW heat pump (HP), and a 302.8 L domestic hot water (DHW) tank. SAHP systems were investigated starting in the 1970s and have received renewed interest since the 1990s due to technological advancements. Solar-assisted heat pump (SAHP) systems bring together the strengths of solar thermal collectors and heat pumps, allowing each piece of equipment to benefit from the presence of the other. Selection and peer review by the scientific conference committee of SHC 2013 under responsibility of PSE AG doi: 10.1016/j.egypro.2014.02.059 Selectionandpeerreviewby thescientificconferencecommitteeofSHC2013 underresponsibilityofPSEAG Keywords: solar thermal heat pump validation renewable energy water heating space heating TRNSYS © 2014TheAuthors.Publishedby Elsevier Ltd. Collins*ĪUniversity of Waterloo, 200 University Ave. Validation of a single tank, multi-mode solar-assisted heat pumpĬarsen J. SHC 2013, International Conference on Solar Heating and Cooling for Buildings and Industry The DHW tank model does bring forth some issues, as simulated stratification can often differ appreciably from experimental stratification. The agreement between simulation and experiment was found to be very strong, with typical differences in average DHW tank temperatures of less than 1 C°. Both the system and model are operated and monitored for representative days from typical meteorological year (TMY) data for Ottawa, Ontario, Canada. The model will be used to conduct more advanced studies supporting the development of similar SAHP system configurations. The main goals of the validation are to: benchmark accuracy, identify strengths and weaknesses, and build confidence in the model. A TRNSYS (TRaNsient SYstem Simulations Tool) model of this SAHP system is validated using a purpose-built experimental test apparatus. The solar heat source is connected to the storage tank via a heat pump and heat exchanger, which operate in parallel paths, providing multiple modes of operation. This work explores the operation and performance of a solar-assisted heat pump (SAHP) system which employs a single domestic hot water (DHW) tank. Abstract of research paper on Earth and related environmental sciences, author of scientific article - Carsen J.
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