The measurement of dynamic thermal response in rooms using pseudo-random binary sequences

Letherman, K.M.; Palin, C.J.; Park, P.M.

doi:10.1016/0360-1323(82)90004-x

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…Statistical method is an alternative approach to determine thermodynamic behaviours by using building performance data [Letherman, Pailing, & Park, 1982;Crawford & Woods, 1985;Andersen et al, 2002;Madsen & Holst, 1995;Braun & Chaturvedi, 2002;Wang and Xu, 2006]. Letherman et al (1982) described a technique to measure room thermal responses using pseudo-random binary sequences. Crawford and Woods (1985) described a method for estimation of continuous-time models for the heat dynamics of buildings using discrete-time building performance data.…”

Section: Approach For Developing a Physical Model For A District Heating Substationmentioning

confidence: 99%

An Investigation Of The Performance Of District Heating Substations Using Computer Simulation

Wong¹

2021

Preprint

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Low primary temperature drop across district heating substations is an undesirable phenomenon observed in the district heating industry. Professionals in the industry have argued that this is caused by inappropriate sizing and controls of district heating substations. The thesis aims to investigate the impact of design and operation parameters on the performance of district heating substations, so that building designers and engineers can potentially better design and operate new and existing district heating substations. The thesis shows that, by developing and using a physical model as a computational tool for sensitivity analysis, different design and operation parameters can be evaluated. This generates insights for energy conserving control strategies to be developed. A preliminary control strategy was proposed for district heating substations, and simulation results show energy saving potentials.

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Section: Approach For Developing a Physical Model For A District Heating Substationmentioning

confidence: 99%

An Investigation Of The Performance Of District Heating Substations Using Computer Simulation

Wong¹

2021

Preprint

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“…3. Poor performance in the cold weather condition, applying the controller designed for the low demand situation [8], [9] and the data-driven methods [10], [11], [12] indicated by [2].…”

Section: B Problem Definitionmentioning

confidence: 99%

Eliminating oscillations in TRV-controlled hydronic radiators

Tahersima

Stoustrup

Rasmussen

2011

IEEE Conference on Decision and Control and European Control Conference

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Abstract-Thermostatic Radiator Valves (TRV) have proved their significant contribution in energy savings for several years. However, at low heat demands, an unstable oscillatory behavior is usually observed and well known for these devices. This instability is due to the nonlinear dynamics of the radiator itself which result in a large time constant and high gain for radiator at low flows. A remedy to this problem is to make the controller of TRVs adaptable with the operating point instead of widely used fixed PI controllers. To this end, we have derived a linear parameter varying model of radiator, formulated based on the operating flow rate, room temperature and the radiator specifications. In order to derive such formulation, the partial differential equation of the radiator heat transfer dynamics is solved analytically. Using the model, a gain schedule controller among various possible control strategies is designed for the TRV. It is shown via simulations that the designed controller based on the proposed LPV model performs excellent and stable in the whole operating conditions.

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“…It is explicitly described how the measurement and model errors enter into the model. Other methods based on experimental data include: utilizing pseudorandom binary sequences of the input to derive the heat dynamics [6], and employing an inverse grey box thermal network model for transient building load prediction [7].The main drawbacks of this approach are that they require a significant amount of training data and may not always reflect the physical behavior [8].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of an HVAC system with TRV controlled hydronic radiator

Tahersima

Stoustrup

Rasmussen

et al. 2010

2010 IEEE International Conference on Automation Science and Engineering

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A control oriented model for an HVAC system is derived in this paper. The HVAC system consists of a room and a hydronic radiator with a temperature regulating valve (TRV) which has a step motor to adjust the valve opening. The heating system and the room are simulated as a unit entity for thermal analysis and controller design. A discrete-element model with interconnected small scaled elements is proposed for the radiator. This models the radiator more precisely than that of a lumped model in terms of transfer delay and radiator gain. This precise modeling gives us an intuition into a regular unwanted phenomenon which occurs in low demand situations. When flow is very low in radiator and the supply water temperature and the pressure drop across the valve is constant, oscillations in room temperature frequently occur. The model derived in this paper demonstrates that the oscillations are in part due to the large gain of the radiator in low demand conditions compared to the high demand situations. The simulation model of radiator is optimized in terms of approximating the small signal gain of radiator in all operating points accurately. The controller designed for high demand weather conditions is applied to the opposite conditions to illustrate the oscillatory condition more apparently. Suggestions to alleviate this situation are proposed.978-1-4244-5448-8/10/$26.00 ©2010 IEEE

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The measurement of dynamic thermal response in rooms using pseudo-random binary sequences

Cited by 21 publications

References 7 publications

An Investigation Of The Performance Of District Heating Substations Using Computer Simulation

An Investigation Of The Performance Of District Heating Substations Using Computer Simulation

Eliminating oscillations in TRV-controlled hydronic radiators

Thermal analysis of an HVAC system with TRV controlled hydronic radiator

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