Air source heat pump water heater in a small mechanical room
I am building a 2-unit addition to a duplex in Portland, OR, resulting in a 4-plex. The new units will be largely separate from the old, and will be built to PH-like standards (very tight air barrier, heavily insulated). With an eye toward economy, I am thinking for the 2 new residences to share a mechanical room. In this mechanical room would be water heater(s) for both new units, along with an HRV (likely Zehnder 550) serving both units.
相关计划和考虑因素：
- 我正在考虑使用ASHP热水器（GE Geospring）的效率的缘故，但明白〜50平方房的房间不会足够大量来支持ASHP。
- 我可能会有一个胸部冷冻箱，在这个机械室里藏起，产生一定量的热量（即http://products.geappliances.com/applproducts/dispatcher?request=specpage&sku=fcm7suww)
- 我可能会有一个穿孔空调型单元，冷却相邻的绝缘葡萄酒壁橱，并将这个单位的热空气排放到机械室（即http://www.beveragefactory.com/wine/cooling/koolr/koolspace_koolr_plus.shtml?bstr=1~ 2000英热单位)
Questions:
– I’m providing DHW for 2 units, with 5 bedrooms in total. Dishwashers and clothes washers to be fed cold water only, so DHW only providing for bathroom sinks and showers (4 baths total), and the 2 kitchen sinks. Could I economize by doing something like using one ASHP water heater in series with a HE resistance heater as a storage/backup? What would be the best way to go about this?
- 胸部冷冻机和葡萄酒冷却器产生的热量是否足以提供ASHP的需求？有没有良好的方法来计算出来？或者我应该考虑管道（下面）
– GE has a ducting kit for their ASHP. Will this be too messy (leaky) for use in this type of construction (assuming vented to exterior)? Should I dare consider doing something creative like porting the cold air into the wine closet and taking heat from the ambient room air? Should I just duct in from the adjacent kitchen and out toward the adjacent hallway, etc.? Could I (gasp!) duct supply and return air for the ASHP using the HRV located in the same room?
我有兴趣听取你对此事的看法。我喜欢用一块石头优雅地杀死多只鸟的想法，但不想不必要地过度补充。
谢谢，
Jonathan
GBA Detail Library
由气候和房屋部件组织的一千个建筑细节的集合
答复
乔纳森，
Every manufacturer of heat-pump water heaters provides information on the minimum volume of the room where the water heater can be installed. If you choose to ignore these instructions, the water heater manufacturer is under no obligation to honor the equipment warranty. So I advise you to build a mechanical room that is large enough for your planned equipment.
I wouldn't depend on having heat available from your freezer and your air conditioner when needed, because there is no guarantee that those two appliances will be producing heat at the time you need it.
通常，使用小型房间作为冷冻柜的热量倾卸，空调是灾难的配方。当您的租户在度假时会发生什么，并且没有对热水的需求？冰箱和空调将倾倒在小型房间里，房间里的空气温度将升至这两个电器倾倒倾倒热量的程度。
I'm not a fan of attempts to use ductwork to solve the problem of an undersized mechanical room. These ductwork schemes are over-complicated, and it doesn't take much of a problem with your equipment to have a big headache. Keep things simple.
我一般同意马丁，但不是关于发热和消费的时间问题。将有足够的热质量来保持热量，当您需要时，您可以容忍该房间的温度波动。当乘客在度假时，更好的论点是过热。避免这个问题可能需要一个恒温器控制的通风扇，只能在罕见的情况下打开。
Figuring out the heat output of the freezer is easy---just look at the rated electric consumption. But for the site-built wine closet, you'd need to do a cooling load calculation and look at the COP of the A/C under the appropriate conditions, which might be outside its specified operation range.
在波特兰或气候桑德的Ecocute热水器中，如果您不介意在建筑物外面有一个迷你分体式压缩机，那么效率高的效率就会更好。这使您可以在户外访问户外作为热质量。
http://www.sandenwaterheater.com/
They're not cheap, but the performance is pretty good, as tested in the Pacific Northwest by the NEEA consortium:
https://www.neea.org/docs/default-source/reports/laboratory-assessment-of-sanden -ges-15qta-heat-pump-water-heater.pdf?sfvrsn=8
感谢您的答复。听起来好像浪费的热量可能是可行的，但不是理想的。为了它的价值，这将是我的住所，以便于可预见的未来，而不是租赁（虽然关于未来租金的评论是有效的）;假期计划是离开房间的门AJAR（批准，轻松忘记）。此外，这个房间不能进一步发展。如果ASHP热水器是扼杀的，我将与电阻相反。
关于GE销售的管道配件怎么样？我的备份计划是向外部导管 - 基于轶事证据是不明智的吗？以及使用两个热水器（一个ASHP，一种阻力）的想法是什么 - 将它们串联化为明智？或者我会更好地做一只ASHP，一个按需电动备用备份？
达娜，谢谢你提到桑德。我长时间 - 由于价格统治了他们 - 它只是最终过度的回报速度太慢，在前端的推荐太多了......
谢谢你的所有帮助！
如果您使用Sanden来供空间加热和热水加热，则这些数字更好地工作。
There's another very simple solution, straight from the manual:
http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=380111_geh50deedsr_c4.pdf
As I understand it, the ASHP water heater has the electric backup built in. So if it somehow makes the room to cold to work as an ASHP, it will switch over automatically.