Low energy cooling for buildings in central Europe - case studies

The paper deals with applicability of passive and low energy cooling technologies in the Czech Republic. In the paper there are presented two recent studies, where computer simulation helps to design properly the passive and low energy cooling for buildings is the Czech Republic. There is presented case studies applying, night cooling, thermal mass and slab cooling. The role of computer simulation in the low energy building design and optimalization is discussed

Computer simulation for better design and operation of large office building air-conditioning

The paper deals with the use of computer simulations both for the design support of a new buildings and HVAC system development and for the optimisation of the system control strategy in the building. This is presented on a real office building in Prague. For a new large bank head office in Prague, computer simulations were carried out to find solutions for reducing the required cooling capacity, verify the fan-coil capacity design, and optimise the external gassing for atriums. Because the design included exposed concrete ceilings, the idea was to apply building thermal mass and find out a way to operate the building. The cooling capacity was initially estimated at 3 MW and simulations proved possibility of decreasing it to 81% for the whole building. Other simulation helped designers to optimise, roof glazing and shading for atria, with stress on thermal comfort in open corridors. The building and HVAC system monitoring and meassurements to confirm the simulation based design changes are presented in the paper

Low energy cooling for buildings in central Europe - case studies

The paper deals with applicability of passive and low energy cooling technologies in the Czech Republic. In the paper there are presented two recent studies, where computer simulation helps to design properly the passive and low energy cooling for buildings is the Czech Republic. There is presented case studies applying, night cooling, thermal mass and slab cooling. The role of computer simulation in the low energy building design and optimalization is discussed

Low energy cooling of buildings in central Europe - case studies

This paper addresses the applicability of passive and low energy cooling technologies in the Czech Republic. The main research methods are climate analysis and buildings and systems analysis, both with the objective to assess the building performance potential of passive and low energy cooling technologies. The analysis is based on case studies, which include building performance simulation as well as in-situ monitoring. The role of computer simulation in low energy building design and optimisation is briefly discussed

Simulation of a data center cooling system in an emergency situation

The paper deals with keeping server rooms at reasonable air temperature in the case of an electrical power failure in a data center and with building performance simulations used to support emergency power planning. An existing data center was analyzed in detail with respect to the possibilities of emergency cooling. Based on the assumption that the thermal capacity of already chilled water can be used to prolong functionality of the cooling system when the roof chillers are out of operation, a backup power supply was designed for Computer Room Air-Conditioning and even for the cooling liquid circuit pumps (i.e. not for the roof chillers). Special models representing the data center indoor environment and cooling system, including a detailed model of the Computer Room Air Conditioning (CRAC) units, were developed in order to estimate the time period during which the internal air temperatures in the server room will not exceed the limit. The numerical model of the server room and the cooling system was built in the TRNSYS software and calibrated by measured data acquired from a real power outage situation. The results and conclusions obtained from the performed analyses and simulations helped to improve the emergency power plan of the data center. The study also forms the basis for the development of an emergency decision algorithm that will included in the novel supervisory control platform: GENi

Simulation-based assessment of thermal aware computation of a bespoke data centre

The role of Data Centres (DCs) as global electricity consumers is growing rapidly due to the exponential increase of computational demand that modern times require. Control strategies that minimize energy consumption while guaranteeing optimal operation conditions in DC are essential to achieve sustainable and energy efficient DCs. Unfortunately, the development and testing of novel control strategies are often slowed down, if not discarded. This is generally due to the lack of access caused by safety and economic reasons. Alternatively, simulation experiments represent a “safe” virtual environment to test novel control strategies, accelerating the process for their implementation in physical DCs. The virtual DC testbed, originated in the GENiC project, supports the development and dynamic testing of control and energy management algorithms. This paper introduces its features and describes its functionality through a simulation-based assessment of thermal aware computation strategy. For this, the virtual DC will be based on a bespoke DC located in Cork (Ireland). This DC has 30 kW capacity, 40 m2 floor area and its layout follows a hot aisle - cold aisle arrangement without containment. The performance the IT Workload allocation under different scenarios and their influence both on the whitespace environment and overall DC performance are evaluated and quantified. Finally, the benefits of a coordinated operation between the thermal and the IT workload managements are discussed

Implementation and demonstration of a building simulation based testbed for assessment of data centre multi-domain control strategies

The traditional data centre (DC) infrastructure is beingsignificantly extended by modern information technology(IT) trends on one side, and lasting calling for DCsustainability on the other. A holistic DC managementwill be necessary to coordinate different DC processesand to dock the DC environment into modern cities anddistrict infrastructure. A development of such a complexmanagement requires comprehensive testing possibilities.The testing is hardly possible on the real DC infrastructuredue to the mission critical nature. Building energymodelling methods offer a suitable platform for thedevelopment of a safe and reliable testing environment.This paper deals with new application of Building EnergySimulation (BES) method and introduces a workflow forvirtual closed-loop testing of enhanced multi-domainoperation for data centres<br/

Computer simulation for better air-conditioning and ventilation design of industrial halls

The paper deals with the use of computer simulations both for the design support of HVAC systems development in existing industrial buildings. There is presented selected industrial hall and its HVAC systems concept. The computer simulation using ESP-r software for different rates of ventilation by outdoor air helped to design an air-conditioning system, which comprises of daytime top cooling and night ventilation by outdoor air combined with accumulation of cold in building constructions. Capacity of mechanical cooling was decreased to more that 50% comparing to original design based on manual calculation for peak loads. The importance of internal gains measurements and investigation for industrial halls is presented as well