Hydronic radiant cooling — preliminary assessment

Feustel, H.E.; Stetiu, Corina

doi:10.1016/0378-7788(95)00922-k

Cited by 204 publications

(89 citation statements)

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“…Water-based radiant cooling systems are gaining popularity as an energy efficient approach for conditioning buildings [1][2][3]. The design of radiant systems is complicated because of the coupling between thermal load, building structure and the hydronic system and because of the important impact of both radiation and convection on thermal comfort.…”

Section: Introductionmentioning

confidence: 99%

Cooling load differences between radiant and air systems

Feng

Schiavon

Bauman

2013

Energy and Buildings

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Unlike the case of air systems where the cooling load is purely convective, the cooling load for radiant systems consists of both convective and radiant components. The main objectives of this energy simulation study were to investigate whether the same design cooling load calculation methods can be used for radiant and air systems by studying the magnitude of the cooling load differences between radiant and air systems over a range of configurations and to suggest potential improvements in current design guidelines. Simulation results show that 1) zone level 24-hour total cooling energy of radiant systems can be 5-15% higher than air systems due to differences in conduction load through the building envelope; 2) peak cooling load at the radiant system hydronic level can be 7-31% higher than air system for zones without solar load. The differences can increase up to 93% at the hydronic level for floor system in zones with solar load; 3) the cooling load differences between the two systems originate from: a) radiant cooling surface(s) directly remove part of the radiant heat gain and reduce heat accumulation in the building mass; b) only part of the convective heat gain becomes instantaneous cooling load. This indicates that simplified methods such as Radiant Time Series Method is not appropriate for cooling load calculation in radiant system design. Radiant systems should be modeled using a dynamic simulation tool that is capable of capturing radiant heat transfer for cooling load calculation.

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Section: Introductionmentioning

confidence: 99%

Cooling load differences between radiant and air systems

Feng

Schiavon

Bauman

2013

Energy and Buildings

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“…The chamber reached steady-state equilibrium at an operative temperature between 26.5º C (no coverage) and 29.3º C (71% coverage). (1) Measured at the central tree at 1.1 m. high; (2) Per unit of panel area; (3) Per unit of floor area; (4) Replicated experiment Figure 3 shows the change in cooling capacity coefficient (Ucc) at each level of cloud coverage. We observe that adding coverage reduces this coefficient.…”

Section: Resultsmentioning

confidence: 99%

“…The sound absorption coefficient of these materials and finishes are reported in . (1) Source: [10], (2) Source: [22], (3) Source: [23], (4) We used concrete ceiling as the reference case because this is the typical finish for TABS Reverberation time criteria are published by ASHRAE in the Performance Measurement Protocols (PMP) Best practices Guide [24] and can be used to determine what acoustical cloud coverage may be needed. Reverberation time relates to speech clarity, and low reverberation (on the order of 0.6 or 0.8 seconds depending on office type) is usually desirable for speech intelligibility.…”

Section: Complementary Analysismentioning

confidence: 99%

Cooling capacity and acoustic performance of radiant slab systems with free-hanging acoustical clouds

Karmann

Bauman

Raftery

et al. 2017

Energy and Buildings

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“…The paper of Zweifel and Koschenz (1993) pointing out the energy and IEQ (Indoor Environment Quality) benefits of separately controlled ventilation and sensible cooling systems, marks a renewed U.S. interest in radiant cooling. A number of papers developed the theoretical basis for radiant cooling designs in which the usual situation of air being cooled to below the desired operative temperature to compensate for higher mean radiant temperatures is reversed (Kilkis et al 1994, Feustel 1999 …”

Section: Cooling By Radiant Panelsmentioning

confidence: 99%

Cost-Effective Integration of Efficient Low-Lift Base Load Cooling Equipment

Jiang¹,

Winiarski²,

Katipamula³

et al. 2008

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Executive SummaryThe long-term goal of Department of Energy's (DOE's) Commercial Buildings Integration program is to develop cost-effective technologies and building practices that will enable the design and construction of net Zero Energy Buildings -commercial buildings that produce as much energy as they use on an annual basis -by 2025. 1 To support this long-term goal, DOE further called foras part of its FY07 Statement of Needs -the development by 2010 of "five cost-effective design technology option sets using highly efficient component technologies, integrated controls, improved construction practices, streamlined commissioning, maintenance and operating procedures that will make new and existing commercial buildings durable, healthy and safe for occupants." 2 In response, Pacific Northwest National Laboratory (PNNL) proposed and DOE funded a scoping study investigation of one such technology option set (TOS), low-lift cooling that offers potentially exemplary heating, ventilation and air conditioning (HVAC) energy performance relative to American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) Standard 90.1-2004. The primary purpose of the scoping study was to estimate the national technical energy savings potential of this TOS.The TOS PNNL evaluated consists of:1. Peak-load shifting by means of active or passive thermal energy storage (TES) 3 . 2. Dedicated outdoor air supply with enthalpy heat recovery from exhaust air. 3. Radiant heating and cooling panels or floor system. 4. Low-lift vapor compression cooling equipment. 5. Advanced controls at the HVAC equipment and HVAC system (supervisory) levels.The application of the TOS was simulated in three medium-sized office building prototypes (baseline, mid-performance and high-performance, which are defined later in the report) in five climate zones around the U.S. Results from our analysis indicate that the technical HVAC energy savings potential of the TOS ranges from 60% to 74% for temperate to hot and humid climates, and 30% to 70% in milder climates. The savings are calculated as a difference between the annual energy use (chiller, fans and pumps) for a building with a conventional HVAC system and the annual energy use for the same building with equipment and controls of the TOS. Because of the nature of this scoping study, a number of assumptions had to be made. These assumptions are listed in the individual sections of the report, where appropriate, and collected for convenient reference in Appendix C.The national technical energy savings potential (cooling, fans and pumps) from the TOS were then estimated by scaling the savings from the prototype building. In this report active denotes peak-shifting by means of a discrete TES such as a stratified water tank; passive refers to pre-cooling of the intrinsic mass (building fabric and contents) by forced air or hydronic radiant cooling using a chiller and/or air-, water-, or refrigerant-side free cooling.iv commercial building stock and the full TOS may be applicable to a frac...

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Hydronic radiant cooling — preliminary assessment

Cited by 204 publications

References 1 publication

Cooling load differences between radiant and air systems

Cooling load differences between radiant and air systems

Cooling capacity and acoustic performance of radiant slab systems with free-hanging acoustical clouds

Cost-Effective Integration of Efficient Low-Lift Base Load Cooling Equipment

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